netlink: 'syz.4.2582': attribute type 13 has an invalid length.
bridge0: port 2(bridge_slave_1) entered disabled state
bridge0: port 1(bridge_slave_0) entered disabled state
=============================
WARNING: suspicious RCU usage
6.15.0-syzkaller-11173-g546b1c9e93c2 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:2076 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
3 locks held by syz.4.2582/14744:
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x600/0x2000 net/core/rtnetlink.c:4054
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x3a/0x2d0 net/ipv6/ip6_fib.c:2316
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0xeb/0x2d0 net/ipv6/ip6_fib.c:2320
stack backtrace:
CPU: 1 UID: 0 PID: 14744 Comm: syz.4.2582 Not tainted 6.15.0-syzkaller-11173-g546b1c9e93c2 #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x166/0x260 kernel/locking/lockdep.c:6871
fib6_del+0xcf2/0x1770 net/ipv6/ip6_fib.c:2076
fib6_clean_node+0x424/0x5b0 net/ipv6/ip6_fib.c:2255
fib6_walk_continue+0x44f/0x8d0 net/ipv6/ip6_fib.c:2177
fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2225
fib6_clean_tree+0xd4/0x110 net/ipv6/ip6_fib.c:2305
__fib6_clean_all+0x107/0x2d0 net/ipv6/ip6_fib.c:2321
rt6_sync_down_dev net/ipv6/route.c:5004 [inline]
rt6_disable_ip+0x2ec/0x990 net/ipv6/route.c:5009
addrconf_ifdown.isra.0+0x11d/0x1a90 net/ipv6/addrconf.c:3857
addrconf_notify+0x220/0x19e0 net/ipv6/addrconf.c:3780
notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230
call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
call_netdevice_notifiers net/core/dev.c:2282 [inline]
__dev_notify_flags+0x1f7/0x2e0 net/core/dev.c:9499
netif_change_flags+0x108/0x160 net/core/dev.c:9526
do_setlink.constprop.0+0xb53/0x4380 net/core/rtnetlink.c:3141
rtnl_group_changelink net/core/rtnetlink.c:3773 [inline]
__rtnl_newlink net/core/rtnetlink.c:3927 [inline]
rtnl_newlink+0x18e0/0x2000 net/core/rtnetlink.c:4055
rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6944
netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
____sys_sendmsg+0xa98/0xc70 net/socket.c:2566
___sys_sendmsg+0x134/0x1d0 net/socket.c:2620
__sys_sendmsg+0x16d/0x220 net/socket.c:2652
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fc6579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f50e655c EFLAGS: 00000296 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 0000000080000180
RDX: 0000000004000c00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
=============================
WARNING: suspicious RCU usage
6.15.0-syzkaller-11173-g546b1c9e93c2 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:2088 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
3 locks held by syz.4.2582/14744:
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x600/0x2000 net/core/rtnetlink.c:4054
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x3a/0x2d0 net/ipv6/ip6_fib.c:2316
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0xeb/0x2d0 net/ipv6/ip6_fib.c:2320
stack backtrace:
CPU: 1 UID: 0 PID: 14744 Comm: syz.4.2582 Not tainted 6.15.0-syzkaller-11173-g546b1c9e93c2 #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x166/0x260 kernel/locking/lockdep.c:6871
fib6_del+0x2ef/0x1770 net/ipv6/ip6_fib.c:2088
fib6_clean_node+0x424/0x5b0 net/ipv6/ip6_fib.c:2255
fib6_walk_continue+0x44f/0x8d0 net/ipv6/ip6_fib.c:2177
fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2225
fib6_clean_tree+0xd4/0x110 net/ipv6/ip6_fib.c:2305
__fib6_clean_all+0x107/0x2d0 net/ipv6/ip6_fib.c:2321
rt6_sync_down_dev net/ipv6/route.c:5004 [inline]
rt6_disable_ip+0x2ec/0x990 net/ipv6/route.c:5009
addrconf_ifdown.isra.0+0x11d/0x1a90 net/ipv6/addrconf.c:3857
addrconf_notify+0x220/0x19e0 net/ipv6/addrconf.c:3780
notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230
call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
call_netdevice_notifiers net/core/dev.c:2282 [inline]
__dev_notify_flags+0x1f7/0x2e0 net/core/dev.c:9499
netif_change_flags+0x108/0x160 net/core/dev.c:9526
do_setlink.constprop.0+0xb53/0x4380 net/core/rtnetlink.c:3141
rtnl_group_changelink net/core/rtnetlink.c:3773 [inline]
__rtnl_newlink net/core/rtnetlink.c:3927 [inline]
rtnl_newlink+0x18e0/0x2000 net/core/rtnetlink.c:4055
rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6944
netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
____sys_sendmsg+0xa98/0xc70 net/socket.c:2566
___sys_sendmsg+0x134/0x1d0 net/socket.c:2620
__sys_sendmsg+0x16d/0x220 net/socket.c:2652
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fc6579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f50e655c EFLAGS: 00000296 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 0000000080000180
RDX: 0000000004000c00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
=============================
WARNING: suspicious RCU usage
6.15.0-syzkaller-11173-g546b1c9e93c2 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1974 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
3 locks held by syz.4.2582/14744:
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x600/0x2000 net/core/rtnetlink.c:4054
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x3a/0x2d0 net/ipv6/ip6_fib.c:2316
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0xeb/0x2d0 net/ipv6/ip6_fib.c:2320
stack backtrace:
CPU: 1 UID: 0 PID: 14744 Comm: syz.4.2582 Not tainted 6.15.0-syzkaller-11173-g546b1c9e93c2 #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x166/0x260 kernel/locking/lockdep.c:6871
fib6_del_route net/ipv6/ip6_fib.c:1974 [inline]
fib6_del+0x1084/0x1770 net/ipv6/ip6_fib.c:2093
fib6_clean_node+0x424/0x5b0 net/ipv6/ip6_fib.c:2255
fib6_walk_continue+0x44f/0x8d0 net/ipv6/ip6_fib.c:2177
fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2225
fib6_clean_tree+0xd4/0x110 net/ipv6/ip6_fib.c:2305
__fib6_clean_all+0x107/0x2d0 net/ipv6/ip6_fib.c:2321
rt6_sync_down_dev net/ipv6/route.c:5004 [inline]
rt6_disable_ip+0x2ec/0x990 net/ipv6/route.c:5009
addrconf_ifdown.isra.0+0x11d/0x1a90 net/ipv6/addrconf.c:3857
addrconf_notify+0x220/0x19e0 net/ipv6/addrconf.c:3780
notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230
call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
call_netdevice_notifiers net/core/dev.c:2282 [inline]
__dev_notify_flags+0x1f7/0x2e0 net/core/dev.c:9499
netif_change_flags+0x108/0x160 net/core/dev.c:9526
do_setlink.constprop.0+0xb53/0x4380 net/core/rtnetlink.c:3141
rtnl_group_changelink net/core/rtnetlink.c:3773 [inline]
__rtnl_newlink net/core/rtnetlink.c:3927 [inline]
rtnl_newlink+0x18e0/0x2000 net/core/rtnetlink.c:4055
rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6944
netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
____sys_sendmsg+0xa98/0xc70 net/socket.c:2566
___sys_sendmsg+0x134/0x1d0 net/socket.c:2620
__sys_sendmsg+0x16d/0x220 net/socket.c:2652
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fc6579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f50e655c EFLAGS: 00000296 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 0000000080000180
RDX: 0000000004000c00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
=============================
WARNING: suspicious RCU usage
6.15.0-syzkaller-11173-g546b1c9e93c2 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1983 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
3 locks held by syz.4.2582/14744:
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x600/0x2000 net/core/rtnetlink.c:4054
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x3a/0x2d0 net/ipv6/ip6_fib.c:2316
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0xeb/0x2d0 net/ipv6/ip6_fib.c:2320
stack backtrace:
CPU: 1 UID: 0 PID: 14744 Comm: syz.4.2582 Not tainted 6.15.0-syzkaller-11173-g546b1c9e93c2 #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x166/0x260 kernel/locking/lockdep.c:6871
fib6_del_route net/ipv6/ip6_fib.c:1983 [inline]
fib6_del+0xfef/0x1770 net/ipv6/ip6_fib.c:2093
fib6_clean_node+0x424/0x5b0 net/ipv6/ip6_fib.c:2255
fib6_walk_continue+0x44f/0x8d0 net/ipv6/ip6_fib.c:2177
fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2225
fib6_clean_tree+0xd4/0x110 net/ipv6/ip6_fib.c:2305
__fib6_clean_all+0x107/0x2d0 net/ipv6/ip6_fib.c:2321
rt6_sync_down_dev net/ipv6/route.c:5004 [inline]
rt6_disable_ip+0x2ec/0x990 net/ipv6/route.c:5009
addrconf_ifdown.isra.0+0x11d/0x1a90 net/ipv6/addrconf.c:3857
addrconf_notify+0x220/0x19e0 net/ipv6/addrconf.c:3780
notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230
call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
call_netdevice_notifiers net/core/dev.c:2282 [inline]
__dev_notify_flags+0x1f7/0x2e0 net/core/dev.c:9499
netif_change_flags+0x108/0x160 net/core/dev.c:9526
do_setlink.constprop.0+0xb53/0x4380 net/core/rtnetlink.c:3141
rtnl_group_changelink net/core/rtnetlink.c:3773 [inline]
__rtnl_newlink net/core/rtnetlink.c:3927 [inline]
rtnl_newlink+0x18e0/0x2000 net/core/rtnetlink.c:4055
rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6944
netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
____sys_sendmsg+0xa98/0xc70 net/socket.c:2566
___sys_sendmsg+0x134/0x1d0 net/socket.c:2620
__sys_sendmsg+0x16d/0x220 net/socket.c:2652
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fc6579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f50e655c EFLAGS: 00000296 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 0000000080000180
RDX: 0000000004000c00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
=============================
WARNING: suspicious RCU usage
6.15.0-syzkaller-11173-g546b1c9e93c2 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:2028 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
4 locks held by syz.4.2582/14744:
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x600/0x2000 net/core/rtnetlink.c:4054
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x3a/0x2d0 net/ipv6/ip6_fib.c:2316
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0xeb/0x2d0 net/ipv6/ip6_fib.c:2320
#3: ffff88805cdeae38 (&net->ipv6.fib6_walker_lock){++.-}-{3:3}, at: fib6_del_route net/ipv6/ip6_fib.c:2024 [inline]
#3: ffff88805cdeae38 (&net->ipv6.fib6_walker_lock){++.-}-{3:3}, at: fib6_del+0x880/0x1770 net/ipv6/ip6_fib.c:2093
stack backtrace:
CPU: 1 UID: 0 PID: 14744 Comm: syz.4.2582 Not tainted 6.15.0-syzkaller-11173-g546b1c9e93c2 #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x166/0x260 kernel/locking/lockdep.c:6871
fib6_del_route net/ipv6/ip6_fib.c:2028 [inline]
fib6_del+0x1281/0x1770 net/ipv6/ip6_fib.c:2093
fib6_clean_node+0x424/0x5b0 net/ipv6/ip6_fib.c:2255
fib6_walk_continue+0x44f/0x8d0 net/ipv6/ip6_fib.c:2177
fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2225
fib6_clean_tree+0xd4/0x110 net/ipv6/ip6_fib.c:2305
__fib6_clean_all+0x107/0x2d0 net/ipv6/ip6_fib.c:2321
rt6_sync_down_dev net/ipv6/route.c:5004 [inline]
rt6_disable_ip+0x2ec/0x990 net/ipv6/route.c:5009
addrconf_ifdown.isra.0+0x11d/0x1a90 net/ipv6/addrconf.c:3857
addrconf_notify+0x220/0x19e0 net/ipv6/addrconf.c:3780
notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230
call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
call_netdevice_notifiers net/core/dev.c:2282 [inline]
__dev_notify_flags+0x1f7/0x2e0 net/core/dev.c:9499
netif_change_flags+0x108/0x160 net/core/dev.c:9526
do_setlink.constprop.0+0xb53/0x4380 net/core/rtnetlink.c:3141
rtnl_group_changelink net/core/rtnetlink.c:3773 [inline]
__rtnl_newlink net/core/rtnetlink.c:3927 [inline]
rtnl_newlink+0x18e0/0x2000 net/core/rtnetlink.c:4055
rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6944
netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
____sys_sendmsg+0xa98/0xc70 net/socket.c:2566
___sys_sendmsg+0x134/0x1d0 net/socket.c:2620
__sys_sendmsg+0x16d/0x220 net/socket.c:2652
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fc6579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f50e655c EFLAGS: 00000296 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 0000000080000180
RDX: 0000000004000c00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
=============================
WARNING: suspicious RCU usage
6.15.0-syzkaller-11173-g546b1c9e93c2 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1858 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
3 locks held by syz.4.2582/14744:
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x600/0x2000 net/core/rtnetlink.c:4054
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x3a/0x2d0 net/ipv6/ip6_fib.c:2316
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0xeb/0x2d0 net/ipv6/ip6_fib.c:2320
stack backtrace:
CPU: 1 UID: 0 PID: 14744 Comm: syz.4.2582 Not tainted 6.15.0-syzkaller-11173-g546b1c9e93c2 #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x166/0x260 kernel/locking/lockdep.c:6871
fib6_repair_tree.part.0+0x5f2/0x1270 net/ipv6/ip6_fib.c:1858
fib6_repair_tree net/ipv6/ip6_fib.c:1852 [inline]
fib6_del_route net/ipv6/ip6_fib.c:2045 [inline]
fib6_del+0x133d/0x1770 net/ipv6/ip6_fib.c:2093
fib6_clean_node+0x424/0x5b0 net/ipv6/ip6_fib.c:2255
fib6_walk_continue+0x44f/0x8d0 net/ipv6/ip6_fib.c:2177
fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2225
fib6_clean_tree+0xd4/0x110 net/ipv6/ip6_fib.c:2305
__fib6_clean_all+0x107/0x2d0 net/ipv6/ip6_fib.c:2321
rt6_sync_down_dev net/ipv6/route.c:5004 [inline]
rt6_disable_ip+0x2ec/0x990 net/ipv6/route.c:5009
addrconf_ifdown.isra.0+0x11d/0x1a90 net/ipv6/addrconf.c:3857
addrconf_notify+0x220/0x19e0 net/ipv6/addrconf.c:3780
notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230
call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
call_netdevice_notifiers net/core/dev.c:2282 [inline]
__dev_notify_flags+0x1f7/0x2e0 net/core/dev.c:9499
netif_change_flags+0x108/0x160 net/core/dev.c:9526
do_setlink.constprop.0+0xb53/0x4380 net/core/rtnetlink.c:3141
rtnl_group_changelink net/core/rtnetlink.c:3773 [inline]
__rtnl_newlink net/core/rtnetlink.c:3927 [inline]
rtnl_newlink+0x18e0/0x2000 net/core/rtnetlink.c:4055
rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6944
netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
____sys_sendmsg+0xa98/0xc70 net/socket.c:2566
___sys_sendmsg+0x134/0x1d0 net/socket.c:2620
__sys_sendmsg+0x16d/0x220 net/socket.c:2652
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fc6579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f50e655c EFLAGS: 00000296 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 0000000080000180
RDX: 0000000004000c00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
=============================
WARNING: suspicious RCU usage
6.15.0-syzkaller-11173-g546b1c9e93c2 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1860 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
3 locks held by syz.4.2582/14744:
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x600/0x2000 net/core/rtnetlink.c:4054
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x3a/0x2d0 net/ipv6/ip6_fib.c:2316
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0xeb/0x2d0 net/ipv6/ip6_fib.c:2320
stack backtrace:
CPU: 1 UID: 0 PID: 14744 Comm: syz.4.2582 Not tainted 6.15.0-syzkaller-11173-g546b1c9e93c2 #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x166/0x260 kernel/locking/lockdep.c:6871
fib6_repair_tree.part.0+0x564/0x1270 net/ipv6/ip6_fib.c:1860
fib6_repair_tree net/ipv6/ip6_fib.c:1852 [inline]
fib6_del_route net/ipv6/ip6_fib.c:2045 [inline]
fib6_del+0x133d/0x1770 net/ipv6/ip6_fib.c:2093
fib6_clean_node+0x424/0x5b0 net/ipv6/ip6_fib.c:2255
fib6_walk_continue+0x44f/0x8d0 net/ipv6/ip6_fib.c:2177
fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2225
fib6_clean_tree+0xd4/0x110 net/ipv6/ip6_fib.c:2305
__fib6_clean_all+0x107/0x2d0 net/ipv6/ip6_fib.c:2321
rt6_sync_down_dev net/ipv6/route.c:5004 [inline]
rt6_disable_ip+0x2ec/0x990 net/ipv6/route.c:5009
addrconf_ifdown.isra.0+0x11d/0x1a90 net/ipv6/addrconf.c:3857
addrconf_notify+0x220/0x19e0 net/ipv6/addrconf.c:3780
notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230
call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
call_netdevice_notifiers net/core/dev.c:2282 [inline]
__dev_notify_flags+0x1f7/0x2e0 net/core/dev.c:9499
netif_change_flags+0x108/0x160 net/core/dev.c:9526
do_setlink.constprop.0+0xb53/0x4380 net/core/rtnetlink.c:3141
rtnl_group_changelink net/core/rtnetlink.c:3773 [inline]
__rtnl_newlink net/core/rtnetlink.c:3927 [inline]
rtnl_newlink+0x18e0/0x2000 net/core/rtnetlink.c:4055
rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6944
netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
____sys_sendmsg+0xa98/0xc70 net/socket.c:2566
___sys_sendmsg+0x134/0x1d0 net/socket.c:2620
__sys_sendmsg+0x16d/0x220 net/socket.c:2652
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fc6579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f50e655c EFLAGS: 00000296 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 0000000080000180
RDX: 0000000004000c00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
=============================
WARNING: suspicious RCU usage
6.15.0-syzkaller-11173-g546b1c9e93c2 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1862 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
3 locks held by syz.4.2582/14744:
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x600/0x2000 net/core/rtnetlink.c:4054
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x3a/0x2d0 net/ipv6/ip6_fib.c:2316
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0xeb/0x2d0 net/ipv6/ip6_fib.c:2320
stack backtrace:
CPU: 1 UID: 0 PID: 14744 Comm: syz.4.2582 Not tainted 6.15.0-syzkaller-11173-g546b1c9e93c2 #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x166/0x260 kernel/locking/lockdep.c:6871
fib6_repair_tree.part.0+0x4d6/0x1270 net/ipv6/ip6_fib.c:1862
fib6_repair_tree net/ipv6/ip6_fib.c:1852 [inline]
fib6_del_route net/ipv6/ip6_fib.c:2045 [inline]
fib6_del+0x133d/0x1770 net/ipv6/ip6_fib.c:2093
fib6_clean_node+0x424/0x5b0 net/ipv6/ip6_fib.c:2255
fib6_walk_continue+0x44f/0x8d0 net/ipv6/ip6_fib.c:2177
fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2225
fib6_clean_tree+0xd4/0x110 net/ipv6/ip6_fib.c:2305
__fib6_clean_all+0x107/0x2d0 net/ipv6/ip6_fib.c:2321
rt6_sync_down_dev net/ipv6/route.c:5004 [inline]
rt6_disable_ip+0x2ec/0x990 net/ipv6/route.c:5009
addrconf_ifdown.isra.0+0x11d/0x1a90 net/ipv6/addrconf.c:3857
addrconf_notify+0x220/0x19e0 net/ipv6/addrconf.c:3780
notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230
call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
call_netdevice_notifiers net/core/dev.c:2282 [inline]
__dev_notify_flags+0x1f7/0x2e0 net/core/dev.c:9499
netif_change_flags+0x108/0x160 net/core/dev.c:9526
do_setlink.constprop.0+0xb53/0x4380 net/core/rtnetlink.c:3141
rtnl_group_changelink net/core/rtnetlink.c:3773 [inline]
__rtnl_newlink net/core/rtnetlink.c:3927 [inline]
rtnl_newlink+0x18e0/0x2000 net/core/rtnetlink.c:4055
rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6944
netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
____sys_sendmsg+0xa98/0xc70 net/socket.c:2566
___sys_sendmsg+0x134/0x1d0 net/socket.c:2620
__sys_sendmsg+0x16d/0x220 net/socket.c:2652
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fc6579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f50e655c EFLAGS: 00000296 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 0000000080000180
RDX: 0000000004000c00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
=============================
WARNING: suspicious RCU usage
6.15.0-syzkaller-11173-g546b1c9e93c2 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1864 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
3 locks held by syz.4.2582/14744:
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x600/0x2000 net/core/rtnetlink.c:4054
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x3a/0x2d0 net/ipv6/ip6_fib.c:2316
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0xeb/0x2d0 net/ipv6/ip6_fib.c:2320
stack backtrace:
CPU: 1 UID: 0 PID: 14744 Comm: syz.4.2582 Not tainted 6.15.0-syzkaller-11173-g546b1c9e93c2 #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x166/0x260 kernel/locking/lockdep.c:6871
fib6_repair_tree.part.0+0x447/0x1270 net/ipv6/ip6_fib.c:1864
fib6_repair_tree net/ipv6/ip6_fib.c:1852 [inline]
fib6_del_route net/ipv6/ip6_fib.c:2045 [inline]
fib6_del+0x133d/0x1770 net/ipv6/ip6_fib.c:2093
fib6_clean_node+0x424/0x5b0 net/ipv6/ip6_fib.c:2255
fib6_walk_continue+0x44f/0x8d0 net/ipv6/ip6_fib.c:2177
fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2225
fib6_clean_tree+0xd4/0x110 net/ipv6/ip6_fib.c:2305
__fib6_clean_all+0x107/0x2d0 net/ipv6/ip6_fib.c:2321
rt6_sync_down_dev net/ipv6/route.c:5004 [inline]
rt6_disable_ip+0x2ec/0x990 net/ipv6/route.c:5009
addrconf_ifdown.isra.0+0x11d/0x1a90 net/ipv6/addrconf.c:3857
addrconf_notify+0x220/0x19e0 net/ipv6/addrconf.c:3780
notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230
call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
call_netdevice_notifiers net/core/dev.c:2282 [inline]
__dev_notify_flags+0x1f7/0x2e0 net/core/dev.c:9499
netif_change_flags+0x108/0x160 net/core/dev.c:9526
do_setlink.constprop.0+0xb53/0x4380 net/core/rtnetlink.c:3141
rtnl_group_changelink net/core/rtnetlink.c:3773 [inline]
__rtnl_newlink net/core/rtnetlink.c:3927 [inline]
rtnl_newlink+0x18e0/0x2000 net/core/rtnetlink.c:4055
rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6944
netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
____sys_sendmsg+0xa98/0xc70 net/socket.c:2566
___sys_sendmsg+0x134/0x1d0 net/socket.c:2620
__sys_sendmsg+0x16d/0x220 net/socket.c:2652
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fc6579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f50e655c EFLAGS: 00000296 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 0000000080000180
RDX: 0000000004000c00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
=============================
WARNING: suspicious RCU usage
6.15.0-syzkaller-11173-g546b1c9e93c2 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1866 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
3 locks held by syz.4.2582/14744:
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x600/0x2000 net/core/rtnetlink.c:4054
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x3a/0x2d0 net/ipv6/ip6_fib.c:2316
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0xeb/0x2d0 net/ipv6/ip6_fib.c:2320
stack backtrace:
CPU: 1 UID: 0 PID: 14744 Comm: syz.4.2582 Not tainted 6.15.0-syzkaller-11173-g546b1c9e93c2 #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x166/0x260 kernel/locking/lockdep.c:6871
fib6_repair_tree.part.0+0x710/0x1270 net/ipv6/ip6_fib.c:1866
fib6_repair_tree net/ipv6/ip6_fib.c:1852 [inline]
fib6_del_route net/ipv6/ip6_fib.c:2045 [inline]
fib6_del+0x133d/0x1770 net/ipv6/ip6_fib.c:2093
fib6_clean_node+0x424/0x5b0 net/ipv6/ip6_fib.c:2255
fib6_walk_continue+0x44f/0x8d0 net/ipv6/ip6_fib.c:2177
fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2225
fib6_clean_tree+0xd4/0x110 net/ipv6/ip6_fib.c:2305
__fib6_clean_all+0x107/0x2d0 net/ipv6/ip6_fib.c:2321
rt6_sync_down_dev net/ipv6/route.c:5004 [inline]
rt6_disable_ip+0x2ec/0x990 net/ipv6/route.c:5009
addrconf_ifdown.isra.0+0x11d/0x1a90 net/ipv6/addrconf.c:3857
addrconf_notify+0x220/0x19e0 net/ipv6/addrconf.c:3780
notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230
call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
call_netdevice_notifiers net/core/dev.c:2282 [inline]
__dev_notify_flags+0x1f7/0x2e0 net/core/dev.c:9499
netif_change_flags+0x108/0x160 net/core/dev.c:9526
do_setlink.constprop.0+0xb53/0x4380 net/core/rtnetlink.c:3141
rtnl_group_changelink net/core/rtnetlink.c:3773 [inline]
__rtnl_newlink net/core/rtnetlink.c:3927 [inline]
rtnl_newlink+0x18e0/0x2000 net/core/rtnetlink.c:4055
rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6944
netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
____sys_sendmsg+0xa98/0xc70 net/socket.c:2566
___sys_sendmsg+0x134/0x1d0 net/socket.c:2620
__sys_sendmsg+0x16d/0x220 net/socket.c:2652
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fc6579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f50e655c EFLAGS: 00000296 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 0000000080000180
RDX: 0000000004000c00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
=============================
WARNING: suspicious RCU usage
6.15.0-syzkaller-11173-g546b1c9e93c2 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1868 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
3 locks held by syz.4.2582/14744:
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x600/0x2000 net/core/rtnetlink.c:4054
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x3a/0x2d0 net/ipv6/ip6_fib.c:2316
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0xeb/0x2d0 net/ipv6/ip6_fib.c:2320
stack backtrace:
CPU: 1 UID: 0 PID: 14744 Comm: syz.4.2582 Not tainted 6.15.0-syzkaller-11173-g546b1c9e93c2 #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x166/0x260 kernel/locking/lockdep.c:6871
fib6_repair_tree.part.0+0x681/0x1270 net/ipv6/ip6_fib.c:1868
fib6_repair_tree net/ipv6/ip6_fib.c:1852 [inline]
fib6_del_route net/ipv6/ip6_fib.c:2045 [inline]
fib6_del+0x133d/0x1770 net/ipv6/ip6_fib.c:2093
fib6_clean_node+0x424/0x5b0 net/ipv6/ip6_fib.c:2255
fib6_walk_continue+0x44f/0x8d0 net/ipv6/ip6_fib.c:2177
fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2225
fib6_clean_tree+0xd4/0x110 net/ipv6/ip6_fib.c:2305
__fib6_clean_all+0x107/0x2d0 net/ipv6/ip6_fib.c:2321
rt6_sync_down_dev net/ipv6/route.c:5004 [inline]
rt6_disable_ip+0x2ec/0x990 net/ipv6/route.c:5009
addrconf_ifdown.isra.0+0x11d/0x1a90 net/ipv6/addrconf.c:3857
addrconf_notify+0x220/0x19e0 net/ipv6/addrconf.c:3780
notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230
call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
call_netdevice_notifiers net/core/dev.c:2282 [inline]
__dev_notify_flags+0x1f7/0x2e0 net/core/dev.c:9499
netif_change_flags+0x108/0x160 net/core/dev.c:9526
do_setlink.constprop.0+0xb53/0x4380 net/core/rtnetlink.c:3141
rtnl_group_changelink net/core/rtnetlink.c:3773 [inline]
__rtnl_newlink net/core/rtnetlink.c:3927 [inline]
rtnl_newlink+0x18e0/0x2000 net/core/rtnetlink.c:4055
rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6944
netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
____sys_sendmsg+0xa98/0xc70 net/socket.c:2566
___sys_sendmsg+0x134/0x1d0 net/socket.c:2620
__sys_sendmsg+0x16d/0x220 net/socket.c:2652
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fc6579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f50e655c EFLAGS: 00000296 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 0000000080000180
RDX: 0000000004000c00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
=============================
WARNING: suspicious RCU usage
6.15.0-syzkaller-11173-g546b1c9e93c2 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1870 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
3 locks held by syz.4.2582/14744:
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x600/0x2000 net/core/rtnetlink.c:4054
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x3a/0x2d0 net/ipv6/ip6_fib.c:2316
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0xeb/0x2d0 net/ipv6/ip6_fib.c:2320
stack backtrace:
CPU: 1 UID: 0 PID: 14744 Comm: syz.4.2582 Not tainted 6.15.0-syzkaller-11173-g546b1c9e93c2 #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x166/0x260 kernel/locking/lockdep.c:6871
fib6_repair_tree.part.0+0x79f/0x1270 net/ipv6/ip6_fib.c:1870
fib6_repair_tree net/ipv6/ip6_fib.c:1852 [inline]
fib6_del_route net/ipv6/ip6_fib.c:2045 [inline]
fib6_del+0x133d/0x1770 net/ipv6/ip6_fib.c:2093
fib6_clean_node+0x424/0x5b0 net/ipv6/ip6_fib.c:2255
fib6_walk_continue+0x44f/0x8d0 net/ipv6/ip6_fib.c:2177
fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2225
fib6_clean_tree+0xd4/0x110 net/ipv6/ip6_fib.c:2305
__fib6_clean_all+0x107/0x2d0 net/ipv6/ip6_fib.c:2321
rt6_sync_down_dev net/ipv6/route.c:5004 [inline]
rt6_disable_ip+0x2ec/0x990 net/ipv6/route.c:5009
addrconf_ifdown.isra.0+0x11d/0x1a90 net/ipv6/addrconf.c:3857
addrconf_notify+0x220/0x19e0 net/ipv6/addrconf.c:3780
notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230
call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
call_netdevice_notifiers net/core/dev.c:2282 [inline]
__dev_notify_flags+0x1f7/0x2e0 net/core/dev.c:9499
netif_change_flags+0x108/0x160 net/core/dev.c:9526
do_setlink.constprop.0+0xb53/0x4380 net/core/rtnetlink.c:3141
rtnl_group_changelink net/core/rtnetlink.c:3773 [inline]
__rtnl_newlink net/core/rtnetlink.c:3927 [inline]
rtnl_newlink+0x18e0/0x2000 net/core/rtnetlink.c:4055
rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6944
netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
____sys_sendmsg+0xa98/0xc70 net/socket.c:2566
___sys_sendmsg+0x134/0x1d0 net/socket.c:2620
__sys_sendmsg+0x16d/0x220 net/socket.c:2652
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fc6579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f50e655c EFLAGS: 00000296 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 0000000080000180
RDX: 0000000004000c00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
=============================
WARNING: suspicious RCU usage
6.15.0-syzkaller-11173-g546b1c9e93c2 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1819 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
3 locks held by syz.4.2582/14744:
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x600/0x2000 net/core/rtnetlink.c:4054
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x3a/0x2d0 net/ipv6/ip6_fib.c:2316
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0xeb/0x2d0 net/ipv6/ip6_fib.c:2320
stack backtrace:
CPU: 1 UID: 0 PID: 14744 Comm: syz.4.2582 Not tainted 6.15.0-syzkaller-11173-g546b1c9e93c2 #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x166/0x260 kernel/locking/lockdep.c:6871
fib6_find_prefix.part.0+0x1ee/0x3e0 net/ipv6/ip6_fib.c:1819
fib6_find_prefix net/ipv6/ip6_fib.c:1815 [inline]
fib6_repair_tree.part.0+0x2c9/0x1270 net/ipv6/ip6_fib.c:1898
fib6_repair_tree net/ipv6/ip6_fib.c:1852 [inline]
fib6_del_route net/ipv6/ip6_fib.c:2045 [inline]
fib6_del+0x133d/0x1770 net/ipv6/ip6_fib.c:2093
fib6_clean_node+0x424/0x5b0 net/ipv6/ip6_fib.c:2255
fib6_walk_continue+0x44f/0x8d0 net/ipv6/ip6_fib.c:2177
fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2225
fib6_clean_tree+0xd4/0x110 net/ipv6/ip6_fib.c:2305
__fib6_clean_all+0x107/0x2d0 net/ipv6/ip6_fib.c:2321
rt6_sync_down_dev net/ipv6/route.c:5004 [inline]
rt6_disable_ip+0x2ec/0x990 net/ipv6/route.c:5009
addrconf_ifdown.isra.0+0x11d/0x1a90 net/ipv6/addrconf.c:3857
addrconf_notify+0x220/0x19e0 net/ipv6/addrconf.c:3780
notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230
call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
call_netdevice_notifiers net/core/dev.c:2282 [inline]
__dev_notify_flags+0x1f7/0x2e0 net/core/dev.c:9499
netif_change_flags+0x108/0x160 net/core/dev.c:9526
do_setlink.constprop.0+0xb53/0x4380 net/core/rtnetlink.c:3141
rtnl_group_changelink net/core/rtnetlink.c:3773 [inline]
__rtnl_newlink net/core/rtnetlink.c:3927 [inline]
rtnl_newlink+0x18e0/0x2000 net/core/rtnetlink.c:4055
rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6944
netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
____sys_sendmsg+0xa98/0xc70 net/socket.c:2566
___sys_sendmsg+0x134/0x1d0 net/socket.c:2620
__sys_sendmsg+0x16d/0x220 net/socket.c:2652
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fc6579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f50e655c EFLAGS: 00000296 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 0000000080000180
RDX: 0000000004000c00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
=============================
WARNING: suspicious RCU usage
6.15.0-syzkaller-11173-g546b1c9e93c2 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1821 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
3 locks held by syz.4.2582/14744:
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x600/0x2000 net/core/rtnetlink.c:4054
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x3a/0x2d0 net/ipv6/ip6_fib.c:2316
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0xeb/0x2d0 net/ipv6/ip6_fib.c:2320
stack backtrace:
CPU: 1 UID: 0 PID: 14744 Comm: syz.4.2582 Not tainted 6.15.0-syzkaller-11173-g546b1c9e93c2 #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x166/0x260 kernel/locking/lockdep.c:6871
fib6_find_prefix.part.0+0x164/0x3e0 net/ipv6/ip6_fib.c:1821
fib6_find_prefix net/ipv6/ip6_fib.c:1815 [inline]
fib6_repair_tree.part.0+0x2c9/0x1270 net/ipv6/ip6_fib.c:1898
fib6_repair_tree net/ipv6/ip6_fib.c:1852 [inline]
fib6_del_route net/ipv6/ip6_fib.c:2045 [inline]
fib6_del+0x133d/0x1770 net/ipv6/ip6_fib.c:2093
fib6_clean_node+0x424/0x5b0 net/ipv6/ip6_fib.c:2255
fib6_walk_continue+0x44f/0x8d0 net/ipv6/ip6_fib.c:2177
fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2225
fib6_clean_tree+0xd4/0x110 net/ipv6/ip6_fib.c:2305
__fib6_clean_all+0x107/0x2d0 net/ipv6/ip6_fib.c:2321
rt6_sync_down_dev net/ipv6/route.c:5004 [inline]
rt6_disable_ip+0x2ec/0x990 net/ipv6/route.c:5009
addrconf_ifdown.isra.0+0x11d/0x1a90 net/ipv6/addrconf.c:3857
addrconf_notify+0x220/0x19e0 net/ipv6/addrconf.c:3780
notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230
call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
call_netdevice_notifiers net/core/dev.c:2282 [inline]
__dev_notify_flags+0x1f7/0x2e0 net/core/dev.c:9499
netif_change_flags+0x108/0x160 net/core/dev.c:9526
do_setlink.constprop.0+0xb53/0x4380 net/core/rtnetlink.c:3141
rtnl_group_changelink net/core/rtnetlink.c:3773 [inline]
__rtnl_newlink net/core/rtnetlink.c:3927 [inline]
rtnl_newlink+0x18e0/0x2000 net/core/rtnetlink.c:4055
rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6944
netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
____sys_sendmsg+0xa98/0xc70 net/socket.c:2566
___sys_sendmsg+0x134/0x1d0 net/socket.c:2620
__sys_sendmsg+0x16d/0x220 net/socket.c:2652
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fc6579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f50e655c EFLAGS: 00000296 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 0000000080000180
RDX: 0000000004000c00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
=============================
WARNING: suspicious RCU usage
6.15.0-syzkaller-11173-g546b1c9e93c2 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1824 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
3 locks held by syz.4.2582/14744:
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x600/0x2000 net/core/rtnetlink.c:4054
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x3a/0x2d0 net/ipv6/ip6_fib.c:2316
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0xeb/0x2d0 net/ipv6/ip6_fib.c:2320
stack backtrace:
CPU: 1 UID: 0 PID: 14744 Comm: syz.4.2582 Not tainted 6.15.0-syzkaller-11173-g546b1c9e93c2 #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x166/0x260 kernel/locking/lockdep.c:6871
fib6_find_prefix.part.0+0x31b/0x3e0 net/ipv6/ip6_fib.c:1824
fib6_find_prefix net/ipv6/ip6_fib.c:1815 [inline]
fib6_repair_tree.part.0+0x2c9/0x1270 net/ipv6/ip6_fib.c:1898
fib6_repair_tree net/ipv6/ip6_fib.c:1852 [inline]
fib6_del_route net/ipv6/ip6_fib.c:2045 [inline]
fib6_del+0x133d/0x1770 net/ipv6/ip6_fib.c:2093
fib6_clean_node+0x424/0x5b0 net/ipv6/ip6_fib.c:2255
fib6_walk_continue+0x44f/0x8d0 net/ipv6/ip6_fib.c:2177
fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2225
fib6_clean_tree+0xd4/0x110 net/ipv6/ip6_fib.c:2305
__fib6_clean_all+0x107/0x2d0 net/ipv6/ip6_fib.c:2321
rt6_sync_down_dev net/ipv6/route.c:5004 [inline]
rt6_disable_ip+0x2ec/0x990 net/ipv6/route.c:5009
addrconf_ifdown.isra.0+0x11d/0x1a90 net/ipv6/addrconf.c:3857
addrconf_notify+0x220/0x19e0 net/ipv6/addrconf.c:3780
notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230
call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
call_netdevice_notifiers net/core/dev.c:2282 [inline]
__dev_notify_flags+0x1f7/0x2e0 net/core/dev.c:9499
netif_change_flags+0x108/0x160 net/core/dev.c:9526
do_setlink.constprop.0+0xb53/0x4380 net/core/rtnetlink.c:3141
rtnl_group_changelink net/core/rtnetlink.c:3773 [inline]
__rtnl_newlink net/core/rtnetlink.c:3927 [inline]
rtnl_newlink+0x18e0/0x2000 net/core/rtnetlink.c:4055
rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6944
netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
____sys_sendmsg+0xa98/0xc70 net/socket.c:2566
___sys_sendmsg+0x134/0x1d0 net/socket.c:2620
__sys_sendmsg+0x16d/0x220 net/socket.c:2652
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fc6579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f50e655c EFLAGS: 00000296 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 0000000080000180
RDX: 0000000004000c00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
=============================
WARNING: suspicious RCU usage
6.15.0-syzkaller-11173-g546b1c9e93c2 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1067 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
3 locks held by syz.4.2582/14744:
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x600/0x2000 net/core/rtnetlink.c:4054
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x3a/0x2d0 net/ipv6/ip6_fib.c:2316
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0xeb/0x2d0 net/ipv6/ip6_fib.c:2320
stack backtrace:
CPU: 1 UID: 0 PID: 14744 Comm: syz.4.2582 Not tainted 6.15.0-syzkaller-11173-g546b1c9e93c2 #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x166/0x260 kernel/locking/lockdep.c:6871
fib6_purge_rt+0x542/0xbf0 net/ipv6/ip6_fib.c:1067
fib6_del_route net/ipv6/ip6_fib.c:2048 [inline]
fib6_del+0xa5e/0x1770 net/ipv6/ip6_fib.c:2093
fib6_clean_node+0x424/0x5b0 net/ipv6/ip6_fib.c:2255
fib6_walk_continue+0x44f/0x8d0 net/ipv6/ip6_fib.c:2177
fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2225
fib6_clean_tree+0xd4/0x110 net/ipv6/ip6_fib.c:2305
__fib6_clean_all+0x107/0x2d0 net/ipv6/ip6_fib.c:2321
rt6_sync_down_dev net/ipv6/route.c:5004 [inline]
rt6_disable_ip+0x2ec/0x990 net/ipv6/route.c:5009
addrconf_ifdown.isra.0+0x11d/0x1a90 net/ipv6/addrconf.c:3857
addrconf_notify+0x220/0x19e0 net/ipv6/addrconf.c:3780
notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230
call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
call_netdevice_notifiers net/core/dev.c:2282 [inline]
__dev_notify_flags+0x1f7/0x2e0 net/core/dev.c:9499
netif_change_flags+0x108/0x160 net/core/dev.c:9526
do_setlink.constprop.0+0xb53/0x4380 net/core/rtnetlink.c:3141
rtnl_group_changelink net/core/rtnetlink.c:3773 [inline]
__rtnl_newlink net/core/rtnetlink.c:3927 [inline]
rtnl_newlink+0x18e0/0x2000 net/core/rtnetlink.c:4055
rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6944
netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
____sys_sendmsg+0xa98/0xc70 net/socket.c:2566
___sys_sendmsg+0x134/0x1d0 net/socket.c:2620
__sys_sendmsg+0x16d/0x220 net/socket.c:2652
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fc6579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f50e655c EFLAGS: 00000296 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 0000000080000180
RDX: 0000000004000c00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
=============================
WARNING: suspicious RCU usage
6.15.0-syzkaller-11173-g546b1c9e93c2 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1077 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
3 locks held by syz.4.2582/14744:
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
#0: ffffffff90149428 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x600/0x2000 net/core/rtnetlink.c:4054
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#1: ffffffff8e3c4cc0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x3a/0x2d0 net/ipv6/ip6_fib.c:2316
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#2: ffff88802737cc30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0xeb/0x2d0 net/ipv6/ip6_fib.c:2320
stack backtrace:
CPU: 1 UID: 0 PID: 14744 Comm: syz.4.2582 Not tainted 6.15.0-syzkaller-11173-g546b1c9e93c2 #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x166/0x260 kernel/locking/lockdep.c:6871
fib6_purge_rt+0x5d7/0xbf0 net/ipv6/ip6_fib.c:1077
fib6_del_route net/ipv6/ip6_fib.c:2048 [inline]
fib6_del+0xa5e/0x1770 net/ipv6/ip6_fib.c:2093
fib6_clean_node+0x424/0x5b0 net/ipv6/ip6_fib.c:2255
fib6_walk_continue+0x44f/0x8d0 net/ipv6/ip6_fib.c:2177
fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2225
fib6_clean_tree+0xd4/0x110 net/ipv6/ip6_fib.c:2305
__fib6_clean_all+0x107/0x2d0 net/ipv6/ip6_fib.c:2321
rt6_sync_down_dev net/ipv6/route.c:5004 [inline]
rt6_disable_ip+0x2ec/0x990 net/ipv6/route.c:5009
addrconf_ifdown.isra.0+0x11d/0x1a90 net/ipv6/addrconf.c:3857
addrconf_notify+0x220/0x19e0 net/ipv6/addrconf.c:3780
notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230
call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
call_netdevice_notifiers net/core/dev.c:2282 [inline]
__dev_notify_flags+0x1f7/0x2e0 net/core/dev.c:9499
netif_change_flags+0x108/0x160 net/core/dev.c:9526
do_setlink.constprop.0+0xb53/0x4380 net/core/rtnetlink.c:3141
rtnl_group_changelink net/core/rtnetlink.c:3773 [inline]
__rtnl_newlink net/core/rtnetlink.c:3927 [inline]
rtnl_newlink+0x18e0/0x2000 net/core/rtnetlink.c:4055
rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6944
netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
____sys_sendmsg+0xa98/0xc70 net/socket.c:2566
___sys_sendmsg+0x134/0x1d0 net/socket.c:2620
__sys_sendmsg+0x16d/0x220 net/socket.c:2652
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fc6579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f50e655c EFLAGS: 00000296 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 0000000080000180
RDX: 0000000004000c00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000025: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000128-0x000000000000012f]
CPU: 1 UID: 0 PID: 14744 Comm: syz.4.2582 Not tainted 6.15.0-syzkaller-11173-g546b1c9e93c2 #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:call_fib6_entry_notifiers net/ipv6/ip6_fib.c:408 [inline]
RIP: 0010:fib6_del_route net/ipv6/ip6_fib.c:2052 [inline]
RIP: 0010:fib6_del+0xe78/0x1770 net/ipv6/ip6_fib.c:2093
Code: a0 00 00 00 80 3c 02 00 0f 85 f8 06 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 1c 24 48 8d bb 2c 01 00 00 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 09 84 d2 74 05 e8
RSP: 0018:ffffc90003ff6840 EFLAGS: 00010203
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90006011000
RDX: 0000000000000025 RSI: ffffffff8a2b8415 RDI: 000000000000012c
RBP: ffffc90003ff6960 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffff8880604d0400
R13: ffffc90003ff69c4 R14: 0000000000000001 R15: ffff88805cdeae10
FS: 0000000000000000(0000) GS:ffff888097873000(0063) knlGS:00000000f50e6b40
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f50c5da4 CR3: 0000000079818000 CR4: 0000000000352ef0
DR0: 000000000000000d DR1: 00000000000000ff DR2: fffffffffffffff7
DR3: 3e00000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
fib6_clean_node+0x424/0x5b0 net/ipv6/ip6_fib.c:2255
fib6_walk_continue+0x44f/0x8d0 net/ipv6/ip6_fib.c:2177
fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2225
fib6_clean_tree+0xd4/0x110 net/ipv6/ip6_fib.c:2305
__fib6_clean_all+0x107/0x2d0 net/ipv6/ip6_fib.c:2321
rt6_sync_down_dev net/ipv6/route.c:5004 [inline]
rt6_disable_ip+0x2ec/0x990 net/ipv6/route.c:5009
addrconf_ifdown.isra.0+0x11d/0x1a90 net/ipv6/addrconf.c:3857
addrconf_notify+0x220/0x19e0 net/ipv6/addrconf.c:3780
notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230
call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
call_netdevice_notifiers net/core/dev.c:2282 [inline]
__dev_notify_flags+0x1f7/0x2e0 net/core/dev.c:9499
netif_change_flags+0x108/0x160 net/core/dev.c:9526
do_setlink.constprop.0+0xb53/0x4380 net/core/rtnetlink.c:3141
rtnl_group_changelink net/core/rtnetlink.c:3773 [inline]
__rtnl_newlink net/core/rtnetlink.c:3927 [inline]
rtnl_newlink+0x18e0/0x2000 net/core/rtnetlink.c:4055
rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6944
netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
____sys_sendmsg+0xa98/0xc70 net/socket.c:2566
___sys_sendmsg+0x134/0x1d0 net/socket.c:2620
__sys_sendmsg+0x16d/0x220 net/socket.c:2652
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fc6579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f50e655c EFLAGS: 00000296 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 0000000080000180
RDX: 0000000004000c00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:call_fib6_entry_notifiers net/ipv6/ip6_fib.c:408 [inline]
RIP: 0010:fib6_del_route net/ipv6/ip6_fib.c:2052 [inline]
RIP: 0010:fib6_del+0xe78/0x1770 net/ipv6/ip6_fib.c:2093
Code: a0 00 00 00 80 3c 02 00 0f 85 f8 06 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 1c 24 48 8d bb 2c 01 00 00 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 09 84 d2 74 05 e8
RSP: 0018:ffffc90003ff6840 EFLAGS: 00010203
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90006011000
RDX: 0000000000000025 RSI: ffffffff8a2b8415 RDI: 000000000000012c
RBP: ffffc90003ff6960 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffff8880604d0400
R13: ffffc90003ff69c4 R14: 0000000000000001 R15: ffff88805cdeae10
FS: 0000000000000000(0000) GS:ffff888097873000(0063) knlGS:00000000f50e6b40
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f50c5da4 CR3: 0000000079818000 CR4: 0000000000352ef0
DR0: 000000000000000d DR1: 00000000000000ff DR2: fffffffffffffff7
DR3: 3e00000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 2 bytes skipped:
0: 10 06 adc %al,(%rsi)
2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi
6: 10 07 adc %al,(%rdi)
8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi
c: 10 08 adc %cl,(%rax)
e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi
1e: 00 51 52 add %dl,0x52(%rcx)
21: 55 push %rbp
22: 89 e5 mov %esp,%ebp
24: 0f 34 sysenter
26: cd 80 int $0x80
* 28: 5d pop %rbp <-- trapping instruction
29: 5a pop %rdx
2a: 59 pop %rcx
2b: c3 ret
2c: 90 nop
2d: 90 nop
2e: 90 nop
2f: 90 nop
30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi