netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. BUG: sleeping function called from invalid context at kernel/locking/mutex.c:938 in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 17835, name: syz-executor.5 2 locks held by syz-executor.5/17835: #0: ffffffff8d6a5628 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8d6a5628 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5561 #1: ffffffff8bf79620 (rcu_read_lock){....}-{1:2}, at: nla_ok include/net/netlink.h:1159 [inline] #1: ffffffff8bf79620 (rcu_read_lock){....}-{1:2}, at: do_setlink+0x27d0/0x3af0 net/core/rtnetlink.c:2868 Preemption disabled at: [<0000000000000000>] 0x0 CPU: 0 PID: 17835 Comm: syz-executor.5 Not tainted 5.13.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 ___might_sleep.cold+0x1f1/0x237 kernel/sched/core.c:8338 __mutex_lock_common kernel/locking/mutex.c:938 [inline] __mutex_lock+0xa9/0x10c0 kernel/locking/mutex.c:1104 __ipv6_dev_mc_dec+0x5f/0x340 net/ipv6/mcast.c:965 addrconf_leave_solict net/ipv6/addrconf.c:2182 [inline] addrconf_leave_solict net/ipv6/addrconf.c:2174 [inline] __ipv6_ifa_notify+0x5b6/0xa90 net/ipv6/addrconf.c:6099 ipv6_ifa_notify net/ipv6/addrconf.c:6122 [inline] ipv6_del_addr+0x463/0xae0 net/ipv6/addrconf.c:1294 addrconf_verify_rtnl+0xdbc/0x1220 net/ipv6/addrconf.c:4489 inet6_set_iftoken net/ipv6/addrconf.c:5757 [inline] inet6_set_link_af+0x53c/0xc40 net/ipv6/addrconf.c:5833 do_setlink+0x290d/0x3af0 net/core/rtnetlink.c:2875 rtnl_setlink+0x246/0x3c0 net/core/rtnetlink.c:3015 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5564 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:674 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350 ___sys_sendmsg+0xf3/0x170 net/socket.c:2404 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline] __do_fast_syscall_32+0x67/0xe0 arch/x86/entry/common.c:143 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:168 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f52549 Code: 03 74 c0 01 10 05 03 74 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 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:00000000f554c5fc EFLAGS: 00000296 ORIG_RAX: 0000000000000172 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000020000180 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ============================= [ BUG: Invalid wait context ] 5.13.0-rc6-syzkaller #0 Tainted: G W ----------------------------- syz-executor.5/17835 is trying to lock: ffff88802f715530 (&idev->mc_lock){+.+.}-{3:3}, at: __ipv6_dev_mc_dec+0x5f/0x340 net/ipv6/mcast.c:965 other info that might help us debug this: context-{4:4} 2 locks held by syz-executor.5/17835: #0: ffffffff8d6a5628 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8d6a5628 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5561 #1: ffffffff8bf79620 (rcu_read_lock){....}-{1:2}, at: nla_ok include/net/netlink.h:1159 [inline] #1: ffffffff8bf79620 (rcu_read_lock){....}-{1:2}, at: do_setlink+0x27d0/0x3af0 net/core/rtnetlink.c:2868 stack backtrace: CPU: 0 PID: 17835 Comm: syz-executor.5 Tainted: G W 5.13.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 print_lock_invalid_wait_context kernel/locking/lockdep.c:4553 [inline] check_wait_context kernel/locking/lockdep.c:4614 [inline] __lock_acquire.cold+0xc8/0x3b4 kernel/locking/lockdep.c:4852 lock_acquire kernel/locking/lockdep.c:5512 [inline] lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5477 __mutex_lock_common kernel/locking/mutex.c:959 [inline] __mutex_lock+0x139/0x10c0 kernel/locking/mutex.c:1104 __ipv6_dev_mc_dec+0x5f/0x340 net/ipv6/mcast.c:965 addrconf_leave_solict net/ipv6/addrconf.c:2182 [inline] addrconf_leave_solict net/ipv6/addrconf.c:2174 [inline] __ipv6_ifa_notify+0x5b6/0xa90 net/ipv6/addrconf.c:6099 ipv6_ifa_notify net/ipv6/addrconf.c:6122 [inline] ipv6_del_addr+0x463/0xae0 net/ipv6/addrconf.c:1294 addrconf_verify_rtnl+0xdbc/0x1220 net/ipv6/addrconf.c:4489 inet6_set_iftoken net/ipv6/addrconf.c:5757 [inline] inet6_set_link_af+0x53c/0xc40 net/ipv6/addrconf.c:5833 do_setlink+0x290d/0x3af0 net/core/rtnetlink.c:2875 rtnl_setlink+0x246/0x3c0 net/core/rtnetlink.c:3015 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5564 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:674 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350 ___sys_sendmsg+0xf3/0x170 net/socket.c:2404 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline] __do_fast_syscall_32+0x67/0xe0 arch/x86/entry/common.c:143 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:168 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f52549 Code: 03 74 c0 01 10 05 03 74 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 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:00000000f554c5fc EFLAGS: 00000296 ORIG_RAX: 0000000000000172 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000020000180 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 BUG: sleeping function called from invalid context at include/linux/sched/mm.h:201 in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 17835, name: syz-executor.5 INFO: lockdep is turned off. Preemption disabled at: [] local_bh_disable include/linux/bottom_half.h:19 [inline] [] netif_addr_lock_bh include/linux/netdevice.h:4549 [inline] [] __dev_mc_del net/core/dev_addr_lists.c:814 [inline] [] dev_mc_del+0x63/0x110 net/core/dev_addr_lists.c:833 CPU: 0 PID: 17835 Comm: syz-executor.5 Tainted: G W 5.13.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 ___might_sleep.cold+0x1f1/0x237 kernel/sched/core.c:8338 might_alloc include/linux/sched/mm.h:201 [inline] slab_pre_alloc_hook mm/slab.h:497 [inline] slab_alloc_node mm/slub.c:2835 [inline] slab_alloc mm/slub.c:2922 [inline] kmem_cache_alloc_trace+0x277/0x2c0 mm/slub.c:2939 kmalloc include/linux/slab.h:556 [inline] kzalloc include/linux/slab.h:686 [inline] mld_add_delrec net/ipv6/mcast.c:737 [inline] igmp6_leave_group net/ipv6/mcast.c:2626 [inline] igmp6_group_dropped+0x4f7/0xe90 net/ipv6/mcast.c:717 __ipv6_dev_mc_dec+0x25d/0x340 net/ipv6/mcast.c:973 addrconf_leave_solict net/ipv6/addrconf.c:2182 [inline] addrconf_leave_solict net/ipv6/addrconf.c:2174 [inline] __ipv6_ifa_notify+0x5b6/0xa90 net/ipv6/addrconf.c:6099 ipv6_ifa_notify net/ipv6/addrconf.c:6122 [inline] ipv6_del_addr+0x463/0xae0 net/ipv6/addrconf.c:1294 addrconf_verify_rtnl+0xdbc/0x1220 net/ipv6/addrconf.c:4489 inet6_set_iftoken net/ipv6/addrconf.c:5757 [inline] inet6_set_link_af+0x53c/0xc40 net/ipv6/addrconf.c:5833 do_setlink+0x290d/0x3af0 net/core/rtnetlink.c:2875 rtnl_setlink+0x246/0x3c0 net/core/rtnetlink.c:3015 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5564 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:674 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350 ___sys_sendmsg+0xf3/0x170 net/socket.c:2404 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline] __do_fast_syscall_32+0x67/0xe0 arch/x86/entry/common.c:143 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:168 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f52549 Code: 03 74 c0 01 10 05 03 74 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 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:00000000f554c5fc EFLAGS: 00000296 ORIG_RAX: 0000000000000172 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000020000180 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000