bridge0: port 2(bridge_slave_1) entered disabled state
bridge_slave_0: left allmulticast mode
bridge_slave_0: left promiscuous mode
bridge0: port 1(bridge_slave_0) entered disabled state
=============================
WARNING: suspicious RCU usage
6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:2024 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
6 locks held by kworker/u8:0/10623:
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319
#2: ffffffff8f2dbd50 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x145/0xbd0 net/core/net_namespace.c:608
#3: ffffffff8f2e8888 (rtnl_mutex){+.+.}-{4:4}, at: cleanup_net+0x611/0xbd0 net/core/net_namespace.c:644
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x9b/0x380 net/ipv6/ip6_fib.c:2263
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0x1ce/0x380 net/ipv6/ip6_fib.c:2267
stack backtrace:
CPU: 0 UID: 0 PID: 10623 Comm: kworker/u8:0 Not tainted 6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: netns cleanup_net
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x140/0x1d0 kernel/locking/lockdep.c:6865
fib6_del+0x1516/0x1550 net/ipv6/ip6_fib.c:2023
fib6_clean_node+0x29f/0x590 net/ipv6/ip6_fib.c:2202
fib6_walk_continue+0x67b/0x910 net/ipv6/ip6_fib.c:2124
fib6_walk+0x149/0x290 net/ipv6/ip6_fib.c:2172
fib6_clean_tree net/ipv6/ip6_fib.c:2252 [inline]
__fib6_clean_all+0x234/0x380 net/ipv6/ip6_fib.c:2268
rt6_sync_down_dev net/ipv6/route.c:4951 [inline]
rt6_disable_ip+0x120/0x720 net/ipv6/route.c:4956
addrconf_ifdown+0x15d/0x1880 net/ipv6/addrconf.c:3857
addrconf_notify+0x1bc/0x1010 net/ipv6/addrconf.c:-1
notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
call_netdevice_notifiers net/core/dev.c:2228 [inline]
dev_close_many+0x29c/0x410 net/core/dev.c:1731
unregister_netdevice_many_notify+0x834/0x2330 net/core/dev.c:11942
cleanup_net+0x6a3/0xbd0 net/core/net_namespace.c:649
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xade/0x17a0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
=============================
WARNING: suspicious RCU usage
6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:2036 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
6 locks held by kworker/u8:0/10623:
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319
#2: ffffffff8f2dbd50 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x145/0xbd0 net/core/net_namespace.c:608
#3: ffffffff8f2e8888 (rtnl_mutex){+.+.}-{4:4}, at: cleanup_net+0x611/0xbd0 net/core/net_namespace.c:644
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x9b/0x380 net/ipv6/ip6_fib.c:2263
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0x1ce/0x380 net/ipv6/ip6_fib.c:2267
stack backtrace:
CPU: 0 UID: 0 PID: 10623 Comm: kworker/u8:0 Not tainted 6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: netns cleanup_net
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x140/0x1d0 kernel/locking/lockdep.c:6865
fib6_del+0x595/0x1550 net/ipv6/ip6_fib.c:2035
fib6_clean_node+0x29f/0x590 net/ipv6/ip6_fib.c:2202
fib6_walk_continue+0x67b/0x910 net/ipv6/ip6_fib.c:2124
fib6_walk+0x149/0x290 net/ipv6/ip6_fib.c:2172
fib6_clean_tree net/ipv6/ip6_fib.c:2252 [inline]
__fib6_clean_all+0x234/0x380 net/ipv6/ip6_fib.c:2268
rt6_sync_down_dev net/ipv6/route.c:4951 [inline]
rt6_disable_ip+0x120/0x720 net/ipv6/route.c:4956
addrconf_ifdown+0x15d/0x1880 net/ipv6/addrconf.c:3857
addrconf_notify+0x1bc/0x1010 net/ipv6/addrconf.c:-1
notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
call_netdevice_notifiers net/core/dev.c:2228 [inline]
dev_close_many+0x29c/0x410 net/core/dev.c:1731
unregister_netdevice_many_notify+0x834/0x2330 net/core/dev.c:11942
cleanup_net+0x6a3/0xbd0 net/core/net_namespace.c:649
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xade/0x17a0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
=============================
WARNING: suspicious RCU usage
6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1922 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
6 locks held by kworker/u8:0/10623:
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319
#2: ffffffff8f2dbd50 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x145/0xbd0 net/core/net_namespace.c:608
#3: ffffffff8f2e8888 (rtnl_mutex){+.+.}-{4:4}, at: cleanup_net+0x611/0xbd0 net/core/net_namespace.c:644
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x9b/0x380 net/ipv6/ip6_fib.c:2263
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0x1ce/0x380 net/ipv6/ip6_fib.c:2267
stack backtrace:
CPU: 0 UID: 0 PID: 10623 Comm: kworker/u8:0 Not tainted 6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: netns cleanup_net
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x140/0x1d0 kernel/locking/lockdep.c:6865
fib6_del_route net/ipv6/ip6_fib.c:1921 [inline]
fib6_del+0x651/0x1550 net/ipv6/ip6_fib.c:2040
fib6_clean_node+0x29f/0x590 net/ipv6/ip6_fib.c:2202
fib6_walk_continue+0x67b/0x910 net/ipv6/ip6_fib.c:2124
fib6_walk+0x149/0x290 net/ipv6/ip6_fib.c:2172
fib6_clean_tree net/ipv6/ip6_fib.c:2252 [inline]
__fib6_clean_all+0x234/0x380 net/ipv6/ip6_fib.c:2268
rt6_sync_down_dev net/ipv6/route.c:4951 [inline]
rt6_disable_ip+0x120/0x720 net/ipv6/route.c:4956
addrconf_ifdown+0x15d/0x1880 net/ipv6/addrconf.c:3857
addrconf_notify+0x1bc/0x1010 net/ipv6/addrconf.c:-1
notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
call_netdevice_notifiers net/core/dev.c:2228 [inline]
dev_close_many+0x29c/0x410 net/core/dev.c:1731
unregister_netdevice_many_notify+0x834/0x2330 net/core/dev.c:11942
cleanup_net+0x6a3/0xbd0 net/core/net_namespace.c:649
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xade/0x17a0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
=============================
WARNING: suspicious RCU usage
6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1931 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
6 locks held by kworker/u8:0/10623:
#0:
ffff88801aef3948
(
(wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
(wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319
#2: ffffffff8f2dbd50 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x145/0xbd0 net/core/net_namespace.c:608
#3: ffffffff8f2e8888 (rtnl_mutex){+.+.}-{4:4}, at: cleanup_net+0x611/0xbd0 net/core/net_namespace.c:644
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x9b/0x380 net/ipv6/ip6_fib.c:2263
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0x1ce/0x380 net/ipv6/ip6_fib.c:2267
stack backtrace:
CPU: 0 UID: 0 PID: 10623 Comm: kworker/u8:0 Not tainted 6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: netns cleanup_net
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x140/0x1d0 kernel/locking/lockdep.c:6865
fib6_del_route net/ipv6/ip6_fib.c:1930 [inline]
fib6_del+0x67a/0x1550 net/ipv6/ip6_fib.c:2040
fib6_clean_node+0x29f/0x590 net/ipv6/ip6_fib.c:2202
fib6_walk_continue+0x67b/0x910 net/ipv6/ip6_fib.c:2124
fib6_walk+0x149/0x290 net/ipv6/ip6_fib.c:2172
fib6_clean_tree net/ipv6/ip6_fib.c:2252 [inline]
__fib6_clean_all+0x234/0x380 net/ipv6/ip6_fib.c:2268
rt6_sync_down_dev net/ipv6/route.c:4951 [inline]
rt6_disable_ip+0x120/0x720 net/ipv6/route.c:4956
addrconf_ifdown+0x15d/0x1880 net/ipv6/addrconf.c:3857
addrconf_notify+0x1bc/0x1010 net/ipv6/addrconf.c:-1
notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
call_netdevice_notifiers net/core/dev.c:2228 [inline]
dev_close_many+0x29c/0x410 net/core/dev.c:1731
unregister_netdevice_many_notify+0x834/0x2330 net/core/dev.c:11942
cleanup_net+0x6a3/0xbd0 net/core/net_namespace.c:649
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xade/0x17a0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
=============================
WARNING: suspicious RCU usage
6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1976 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
7 locks held by kworker/u8:0/10623:
#0: ffff88801aef3948
((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319
#2: ffffffff8f2dbd50 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x145/0xbd0 net/core/net_namespace.c:608
#3: ffffffff8f2e8888 (rtnl_mutex){+.+.}-{4:4}, at: cleanup_net+0x611/0xbd0 net/core/net_namespace.c:644
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x9b/0x380 net/ipv6/ip6_fib.c:2263
#5: ffff88805a2c7c30 (
&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0x1ce/0x380 net/ipv6/ip6_fib.c:2267
#6: ffff888021352d38 (&net->ipv6.fib6_walker_lock){++.-}-{3:3}, at: fib6_del_route net/ipv6/ip6_fib.c:1971 [inline]
#6: ffff888021352d38 (&net->ipv6.fib6_walker_lock){++.-}-{3:3}, at: fib6_del+0xb3f/0x1550 net/ipv6/ip6_fib.c:2040
stack backtrace:
CPU: 0 UID: 0 PID: 10623 Comm: kworker/u8:0 Not tainted 6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: netns cleanup_net
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x140/0x1d0 kernel/locking/lockdep.c:6865
fib6_del_route net/ipv6/ip6_fib.c:1975 [inline]
fib6_del+0xd5c/0x1550 net/ipv6/ip6_fib.c:2040
fib6_clean_node+0x29f/0x590 net/ipv6/ip6_fib.c:2202
fib6_walk_continue+0x67b/0x910 net/ipv6/ip6_fib.c:2124
fib6_walk+0x149/0x290 net/ipv6/ip6_fib.c:2172
fib6_clean_tree net/ipv6/ip6_fib.c:2252 [inline]
__fib6_clean_all+0x234/0x380 net/ipv6/ip6_fib.c:2268
rt6_sync_down_dev net/ipv6/route.c:4951 [inline]
rt6_disable_ip+0x120/0x720 net/ipv6/route.c:4956
addrconf_ifdown+0x15d/0x1880 net/ipv6/addrconf.c:3857
addrconf_notify+0x1bc/0x1010 net/ipv6/addrconf.c:-1
notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
call_netdevice_notifiers net/core/dev.c:2228 [inline]
dev_close_many+0x29c/0x410 net/core/dev.c:1731
unregister_netdevice_many_notify+0x834/0x2330 net/core/dev.c:11942
cleanup_net+0x6a3/0xbd0 net/core/net_namespace.c:649
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xade/0x17a0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
=============================
WARNING: suspicious RCU usage
6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1806 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
6 locks held by kworker/u8:0/10623:
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319
#2: ffffffff8f2dbd50 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x145/0xbd0 net/core/net_namespace.c:608
#3: ffffffff8f2e8888 (rtnl_mutex){+.+.}-{4:4}, at: cleanup_net+0x611/0xbd0 net/core/net_namespace.c:644
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x9b/0x380 net/ipv6/ip6_fib.c:2263
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0x1ce/0x380 net/ipv6/ip6_fib.c:2267
stack backtrace:
CPU: 0 UID: 0 PID: 10623 Comm: kworker/u8:0 Not tainted 6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: netns cleanup_net
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x140/0x1d0 kernel/locking/lockdep.c:6865
fib6_repair_tree+0xdad/0x11c0 net/ipv6/ip6_fib.c:1805
fib6_del_route net/ipv6/ip6_fib.c:1992 [inline]
fib6_del+0xed2/0x1550 net/ipv6/ip6_fib.c:2040
fib6_clean_node+0x29f/0x590 net/ipv6/ip6_fib.c:2202
fib6_walk_continue+0x67b/0x910 net/ipv6/ip6_fib.c:2124
fib6_walk+0x149/0x290 net/ipv6/ip6_fib.c:2172
fib6_clean_tree net/ipv6/ip6_fib.c:2252 [inline]
__fib6_clean_all+0x234/0x380 net/ipv6/ip6_fib.c:2268
rt6_sync_down_dev net/ipv6/route.c:4951 [inline]
rt6_disable_ip+0x120/0x720 net/ipv6/route.c:4956
addrconf_ifdown+0x15d/0x1880 net/ipv6/addrconf.c:3857
addrconf_notify+0x1bc/0x1010 net/ipv6/addrconf.c:-1
notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
call_netdevice_notifiers net/core/dev.c:2228 [inline]
dev_close_many+0x29c/0x410 net/core/dev.c:1731
unregister_netdevice_many_notify+0x834/0x2330 net/core/dev.c:11942
cleanup_net+0x6a3/0xbd0 net/core/net_namespace.c:649
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xade/0x17a0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
=============================
WARNING: suspicious RCU usage
6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1808 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
6 locks held by kworker/u8:0/10623:
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319
#2: ffffffff8f2dbd50 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x145/0xbd0 net/core/net_namespace.c:608
#3: ffffffff8f2e8888 (rtnl_mutex){+.+.}-{4:4}, at: cleanup_net+0x611/0xbd0 net/core/net_namespace.c:644
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x9b/0x380 net/ipv6/ip6_fib.c:2263
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0x1ce/0x380 net/ipv6/ip6_fib.c:2267
stack backtrace:
CPU: 0 UID: 0 PID: 10623 Comm: kworker/u8:0 Not tainted 6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: netns cleanup_net
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x140/0x1d0 kernel/locking/lockdep.c:6865
fib6_repair_tree+0xdd6/0x11c0 net/ipv6/ip6_fib.c:1807
fib6_del_route net/ipv6/ip6_fib.c:1992 [inline]
fib6_del+0xed2/0x1550 net/ipv6/ip6_fib.c:2040
fib6_clean_node+0x29f/0x590 net/ipv6/ip6_fib.c:2202
fib6_walk_continue+0x67b/0x910 net/ipv6/ip6_fib.c:2124
fib6_walk+0x149/0x290 net/ipv6/ip6_fib.c:2172
fib6_clean_tree net/ipv6/ip6_fib.c:2252 [inline]
__fib6_clean_all+0x234/0x380 net/ipv6/ip6_fib.c:2268
rt6_sync_down_dev net/ipv6/route.c:4951 [inline]
rt6_disable_ip+0x120/0x720 net/ipv6/route.c:4956
addrconf_ifdown+0x15d/0x1880 net/ipv6/addrconf.c:3857
addrconf_notify+0x1bc/0x1010 net/ipv6/addrconf.c:-1
notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
call_netdevice_notifiers net/core/dev.c:2228 [inline]
dev_close_many+0x29c/0x410 net/core/dev.c:1731
unregister_netdevice_many_notify+0x834/0x2330 net/core/dev.c:11942
cleanup_net+0x6a3/0xbd0 net/core/net_namespace.c:649
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xade/0x17a0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
=============================
WARNING: suspicious RCU usage
6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1810 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
6 locks held by kworker/u8:0/10623:
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319
#2: ffffffff8f2dbd50 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x145/0xbd0 net/core/net_namespace.c:608
#3: ffffffff8f2e8888 (rtnl_mutex){+.+.}-{4:4}, at: cleanup_net+0x611/0xbd0 net/core/net_namespace.c:644
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x9b/0x380 net/ipv6/ip6_fib.c:2263
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0x1ce/0x380 net/ipv6/ip6_fib.c:2267
stack backtrace:
CPU: 0 UID: 0 PID: 10623 Comm: kworker/u8:0 Not tainted 6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: netns cleanup_net
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x140/0x1d0 kernel/locking/lockdep.c:6865
fib6_repair_tree+0xdff/0x11c0 net/ipv6/ip6_fib.c:1809
fib6_del_route net/ipv6/ip6_fib.c:1992 [inline]
fib6_del+0xed2/0x1550 net/ipv6/ip6_fib.c:2040
fib6_clean_node+0x29f/0x590 net/ipv6/ip6_fib.c:2202
fib6_walk_continue+0x67b/0x910 net/ipv6/ip6_fib.c:2124
fib6_walk+0x149/0x290 net/ipv6/ip6_fib.c:2172
fib6_clean_tree net/ipv6/ip6_fib.c:2252 [inline]
__fib6_clean_all+0x234/0x380 net/ipv6/ip6_fib.c:2268
rt6_sync_down_dev net/ipv6/route.c:4951 [inline]
rt6_disable_ip+0x120/0x720 net/ipv6/route.c:4956
addrconf_ifdown+0x15d/0x1880 net/ipv6/addrconf.c:3857
addrconf_notify+0x1bc/0x1010 net/ipv6/addrconf.c:-1
notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
call_netdevice_notifiers net/core/dev.c:2228 [inline]
dev_close_many+0x29c/0x410 net/core/dev.c:1731
unregister_netdevice_many_notify+0x834/0x2330 net/core/dev.c:11942
cleanup_net+0x6a3/0xbd0 net/core/net_namespace.c:649
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xade/0x17a0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
=============================
WARNING: suspicious RCU usage
6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1812 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
6 locks held by kworker/u8:0/10623:
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319
#2: ffffffff8f2dbd50 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x145/0xbd0 net/core/net_namespace.c:608
#3: ffffffff8f2e8888 (rtnl_mutex){+.+.}-{4:4}, at: cleanup_net+0x611/0xbd0 net/core/net_namespace.c:644
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x9b/0x380 net/ipv6/ip6_fib.c:2263
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0x1ce/0x380 net/ipv6/ip6_fib.c:2267
stack backtrace:
CPU: 0 UID: 0 PID: 10623 Comm: kworker/u8:0 Not tainted 6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: netns cleanup_net
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x140/0x1d0 kernel/locking/lockdep.c:6865
fib6_repair_tree+0xe28/0x11c0 net/ipv6/ip6_fib.c:1811
fib6_del_route net/ipv6/ip6_fib.c:1992 [inline]
fib6_del+0xed2/0x1550 net/ipv6/ip6_fib.c:2040
fib6_clean_node+0x29f/0x590 net/ipv6/ip6_fib.c:2202
fib6_walk_continue+0x67b/0x910 net/ipv6/ip6_fib.c:2124
fib6_walk+0x149/0x290 net/ipv6/ip6_fib.c:2172
fib6_clean_tree net/ipv6/ip6_fib.c:2252 [inline]
__fib6_clean_all+0x234/0x380 net/ipv6/ip6_fib.c:2268
rt6_sync_down_dev net/ipv6/route.c:4951 [inline]
rt6_disable_ip+0x120/0x720 net/ipv6/route.c:4956
addrconf_ifdown+0x15d/0x1880 net/ipv6/addrconf.c:3857
addrconf_notify+0x1bc/0x1010 net/ipv6/addrconf.c:-1
notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
call_netdevice_notifiers net/core/dev.c:2228 [inline]
dev_close_many+0x29c/0x410 net/core/dev.c:1731
unregister_netdevice_many_notify+0x834/0x2330 net/core/dev.c:11942
cleanup_net+0x6a3/0xbd0 net/core/net_namespace.c:649
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xade/0x17a0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
=============================
WARNING: suspicious RCU usage
6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1814 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
6 locks held by kworker/u8:0/10623:
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319
#2: ffffffff8f2dbd50 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x145/0xbd0 net/core/net_namespace.c:608
#3: ffffffff8f2e8888 (rtnl_mutex){+.+.}-{4:4}, at: cleanup_net+0x611/0xbd0 net/core/net_namespace.c:644
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x9b/0x380 net/ipv6/ip6_fib.c:2263
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0x1ce/0x380 net/ipv6/ip6_fib.c:2267
stack backtrace:
CPU: 0 UID: 0 PID: 10623 Comm: kworker/u8:0 Not tainted 6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: netns cleanup_net
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x140/0x1d0 kernel/locking/lockdep.c:6865
fib6_repair_tree+0xe51/0x11c0 net/ipv6/ip6_fib.c:1813
fib6_del_route net/ipv6/ip6_fib.c:1992 [inline]
fib6_del+0xed2/0x1550 net/ipv6/ip6_fib.c:2040
fib6_clean_node+0x29f/0x590 net/ipv6/ip6_fib.c:2202
fib6_walk_continue+0x67b/0x910 net/ipv6/ip6_fib.c:2124
fib6_walk+0x149/0x290 net/ipv6/ip6_fib.c:2172
fib6_clean_tree net/ipv6/ip6_fib.c:2252 [inline]
__fib6_clean_all+0x234/0x380 net/ipv6/ip6_fib.c:2268
rt6_sync_down_dev net/ipv6/route.c:4951 [inline]
rt6_disable_ip+0x120/0x720 net/ipv6/route.c:4956
addrconf_ifdown+0x15d/0x1880 net/ipv6/addrconf.c:3857
addrconf_notify+0x1bc/0x1010 net/ipv6/addrconf.c:-1
notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
call_netdevice_notifiers net/core/dev.c:2228 [inline]
dev_close_many+0x29c/0x410 net/core/dev.c:1731
unregister_netdevice_many_notify+0x834/0x2330 net/core/dev.c:11942
cleanup_net+0x6a3/0xbd0 net/core/net_namespace.c:649
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xade/0x17a0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
=============================
WARNING: suspicious RCU usage
6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1816 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
6 locks held by kworker/u8:0/10623:
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319
#2: ffffffff8f2dbd50 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x145/0xbd0 net/core/net_namespace.c:608
#3: ffffffff8f2e8888 (rtnl_mutex){+.+.}-{4:4}, at: cleanup_net+0x611/0xbd0 net/core/net_namespace.c:644
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x9b/0x380 net/ipv6/ip6_fib.c:2263
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0x1ce/0x380 net/ipv6/ip6_fib.c:2267
stack backtrace:
CPU: 0 UID: 0 PID: 10623 Comm: kworker/u8:0 Not tainted 6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: netns cleanup_net
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x140/0x1d0 kernel/locking/lockdep.c:6865
fib6_repair_tree+0xe7a/0x11c0 net/ipv6/ip6_fib.c:1815
fib6_del_route net/ipv6/ip6_fib.c:1992 [inline]
fib6_del+0xed2/0x1550 net/ipv6/ip6_fib.c:2040
fib6_clean_node+0x29f/0x590 net/ipv6/ip6_fib.c:2202
fib6_walk_continue+0x67b/0x910 net/ipv6/ip6_fib.c:2124
fib6_walk+0x149/0x290 net/ipv6/ip6_fib.c:2172
fib6_clean_tree net/ipv6/ip6_fib.c:2252 [inline]
__fib6_clean_all+0x234/0x380 net/ipv6/ip6_fib.c:2268
rt6_sync_down_dev net/ipv6/route.c:4951 [inline]
rt6_disable_ip+0x120/0x720 net/ipv6/route.c:4956
addrconf_ifdown+0x15d/0x1880 net/ipv6/addrconf.c:3857
addrconf_notify+0x1bc/0x1010 net/ipv6/addrconf.c:-1
notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
call_netdevice_notifiers net/core/dev.c:2228 [inline]
dev_close_many+0x29c/0x410 net/core/dev.c:1731
unregister_netdevice_many_notify+0x834/0x2330 net/core/dev.c:11942
cleanup_net+0x6a3/0xbd0 net/core/net_namespace.c:649
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xade/0x17a0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
=============================
WARNING: suspicious RCU usage
6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1818 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
6 locks held by kworker/u8:0/10623:
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319
#2: ffffffff8f2dbd50 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x145/0xbd0 net/core/net_namespace.c:608
#3: ffffffff8f2e8888 (rtnl_mutex){+.+.}-{4:4}, at: cleanup_net+0x611/0xbd0 net/core/net_namespace.c:644
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x9b/0x380 net/ipv6/ip6_fib.c:2263
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0x1ce/0x380 net/ipv6/ip6_fib.c:2267
stack backtrace:
CPU: 0 UID: 0 PID: 10623 Comm: kworker/u8:0 Not tainted 6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: netns cleanup_net
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x140/0x1d0 kernel/locking/lockdep.c:6865
fib6_repair_tree+0xea3/0x11c0 net/ipv6/ip6_fib.c:1817
fib6_del_route net/ipv6/ip6_fib.c:1992 [inline]
fib6_del+0xed2/0x1550 net/ipv6/ip6_fib.c:2040
fib6_clean_node+0x29f/0x590 net/ipv6/ip6_fib.c:2202
fib6_walk_continue+0x67b/0x910 net/ipv6/ip6_fib.c:2124
fib6_walk+0x149/0x290 net/ipv6/ip6_fib.c:2172
fib6_clean_tree net/ipv6/ip6_fib.c:2252 [inline]
__fib6_clean_all+0x234/0x380 net/ipv6/ip6_fib.c:2268
rt6_sync_down_dev net/ipv6/route.c:4951 [inline]
rt6_disable_ip+0x120/0x720 net/ipv6/route.c:4956
addrconf_ifdown+0x15d/0x1880 net/ipv6/addrconf.c:3857
addrconf_notify+0x1bc/0x1010 net/ipv6/addrconf.c:-1
notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
call_netdevice_notifiers net/core/dev.c:2228 [inline]
dev_close_many+0x29c/0x410 net/core/dev.c:1731
unregister_netdevice_many_notify+0x834/0x2330 net/core/dev.c:11942
cleanup_net+0x6a3/0xbd0 net/core/net_namespace.c:649
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xade/0x17a0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
=============================
WARNING: suspicious RCU usage
6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1767 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
6 locks held by kworker/u8:0/10623:
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319
#2: ffffffff8f2dbd50 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x145/0xbd0 net/core/net_namespace.c:608
#3: ffffffff8f2e8888 (rtnl_mutex){+.+.}-{4:4}, at: cleanup_net+0x611/0xbd0 net/core/net_namespace.c:644
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x9b/0x380 net/ipv6/ip6_fib.c:2263
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0x1ce/0x380 net/ipv6/ip6_fib.c:2267
stack backtrace:
CPU: 0 UID: 0 PID: 10623 Comm: kworker/u8:0 Not tainted 6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: netns cleanup_net
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x140/0x1d0 kernel/locking/lockdep.c:6865
fib6_find_prefix+0x1e8/0x3f0 net/ipv6/ip6_fib.c:1766
fib6_repair_tree+0x10bd/0x11c0 net/ipv6/ip6_fib.c:1845
fib6_del_route net/ipv6/ip6_fib.c:1992 [inline]
fib6_del+0xed2/0x1550 net/ipv6/ip6_fib.c:2040
fib6_clean_node+0x29f/0x590 net/ipv6/ip6_fib.c:2202
fib6_walk_continue+0x67b/0x910 net/ipv6/ip6_fib.c:2124
fib6_walk+0x149/0x290 net/ipv6/ip6_fib.c:2172
fib6_clean_tree net/ipv6/ip6_fib.c:2252 [inline]
__fib6_clean_all+0x234/0x380 net/ipv6/ip6_fib.c:2268
rt6_sync_down_dev net/ipv6/route.c:4951 [inline]
rt6_disable_ip+0x120/0x720 net/ipv6/route.c:4956
addrconf_ifdown+0x15d/0x1880 net/ipv6/addrconf.c:3857
addrconf_notify+0x1bc/0x1010 net/ipv6/addrconf.c:-1
notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
call_netdevice_notifiers net/core/dev.c:2228 [inline]
dev_close_many+0x29c/0x410 net/core/dev.c:1731
unregister_netdevice_many_notify+0x834/0x2330 net/core/dev.c:11942
cleanup_net+0x6a3/0xbd0 net/core/net_namespace.c:649
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xade/0x17a0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
=============================
WARNING: suspicious RCU usage
6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1769 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
6 locks held by kworker/u8:0/10623:
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319
#2: ffffffff8f2dbd50 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x145/0xbd0 net/core/net_namespace.c:608
#3: ffffffff8f2e8888 (rtnl_mutex){+.+.}-{4:4}, at: cleanup_net+0x611/0xbd0 net/core/net_namespace.c:644
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x9b/0x380 net/ipv6/ip6_fib.c:2263
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0x1ce/0x380 net/ipv6/ip6_fib.c:2267
stack backtrace:
CPU: 0 UID: 0 PID: 10623 Comm: kworker/u8:0 Not tainted 6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: netns cleanup_net
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x140/0x1d0 kernel/locking/lockdep.c:6865
fib6_find_prefix+0x211/0x3f0 net/ipv6/ip6_fib.c:1768
fib6_repair_tree+0x10bd/0x11c0 net/ipv6/ip6_fib.c:1845
fib6_del_route net/ipv6/ip6_fib.c:1992 [inline]
fib6_del+0xed2/0x1550 net/ipv6/ip6_fib.c:2040
fib6_clean_node+0x29f/0x590 net/ipv6/ip6_fib.c:2202
fib6_walk_continue+0x67b/0x910 net/ipv6/ip6_fib.c:2124
fib6_walk+0x149/0x290 net/ipv6/ip6_fib.c:2172
fib6_clean_tree net/ipv6/ip6_fib.c:2252 [inline]
__fib6_clean_all+0x234/0x380 net/ipv6/ip6_fib.c:2268
rt6_sync_down_dev net/ipv6/route.c:4951 [inline]
rt6_disable_ip+0x120/0x720 net/ipv6/route.c:4956
addrconf_ifdown+0x15d/0x1880 net/ipv6/addrconf.c:3857
addrconf_notify+0x1bc/0x1010 net/ipv6/addrconf.c:-1
notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
call_netdevice_notifiers net/core/dev.c:2228 [inline]
dev_close_many+0x29c/0x410 net/core/dev.c:1731
unregister_netdevice_many_notify+0x834/0x2330 net/core/dev.c:11942
cleanup_net+0x6a3/0xbd0 net/core/net_namespace.c:649
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xade/0x17a0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
=============================
WARNING: suspicious RCU usage
6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1772 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
6 locks held by kworker/u8:0/10623:
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319
#2: ffffffff8f2dbd50 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x145/0xbd0 net/core/net_namespace.c:608
#3: ffffffff8f2e8888 (rtnl_mutex){+.+.}-{4:4}, at: cleanup_net+0x611/0xbd0 net/core/net_namespace.c:644
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x9b/0x380 net/ipv6/ip6_fib.c:2263
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0x1ce/0x380 net/ipv6/ip6_fib.c:2267
stack backtrace:
CPU: 0 UID: 0 PID: 10623 Comm: kworker/u8:0 Not tainted 6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: netns cleanup_net
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x140/0x1d0 kernel/locking/lockdep.c:6865
fib6_find_prefix+0x399/0x3f0 net/ipv6/ip6_fib.c:1771
fib6_repair_tree+0x10bd/0x11c0 net/ipv6/ip6_fib.c:1845
fib6_del_route net/ipv6/ip6_fib.c:1992 [inline]
fib6_del+0xed2/0x1550 net/ipv6/ip6_fib.c:2040
fib6_clean_node+0x29f/0x590 net/ipv6/ip6_fib.c:2202
fib6_walk_continue+0x67b/0x910 net/ipv6/ip6_fib.c:2124
fib6_walk+0x149/0x290 net/ipv6/ip6_fib.c:2172
fib6_clean_tree net/ipv6/ip6_fib.c:2252 [inline]
__fib6_clean_all+0x234/0x380 net/ipv6/ip6_fib.c:2268
rt6_sync_down_dev net/ipv6/route.c:4951 [inline]
rt6_disable_ip+0x120/0x720 net/ipv6/route.c:4956
addrconf_ifdown+0x15d/0x1880 net/ipv6/addrconf.c:3857
addrconf_notify+0x1bc/0x1010 net/ipv6/addrconf.c:-1
notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
call_netdevice_notifiers net/core/dev.c:2228 [inline]
dev_close_many+0x29c/0x410 net/core/dev.c:1731
unregister_netdevice_many_notify+0x834/0x2330 net/core/dev.c:11942
cleanup_net+0x6a3/0xbd0 net/core/net_namespace.c:649
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xade/0x17a0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
=============================
WARNING: suspicious RCU usage
6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1049 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
6 locks held by kworker/u8:0/10623:
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319
#2: ffffffff8f2dbd50 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x145/0xbd0 net/core/net_namespace.c:608
#3: ffffffff8f2e8888 (rtnl_mutex){+.+.}-{4:4}, at: cleanup_net+0x611/0xbd0 net/core/net_namespace.c:644
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x9b/0x380 net/ipv6/ip6_fib.c:2263
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0x1ce/0x380 net/ipv6/ip6_fib.c:2267
stack backtrace:
CPU: 0 UID: 0 PID: 10623 Comm: kworker/u8:0 Not tainted 6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: netns cleanup_net
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x140/0x1d0 kernel/locking/lockdep.c:6865
fib6_purge_rt+0x5db/0x830 net/ipv6/ip6_fib.c:1048
fib6_del_route net/ipv6/ip6_fib.c:1995 [inline]
fib6_del+0xee1/0x1550 net/ipv6/ip6_fib.c:2040
fib6_clean_node+0x29f/0x590 net/ipv6/ip6_fib.c:2202
fib6_walk_continue+0x67b/0x910 net/ipv6/ip6_fib.c:2124
fib6_walk+0x149/0x290 net/ipv6/ip6_fib.c:2172
fib6_clean_tree net/ipv6/ip6_fib.c:2252 [inline]
__fib6_clean_all+0x234/0x380 net/ipv6/ip6_fib.c:2268
rt6_sync_down_dev net/ipv6/route.c:4951 [inline]
rt6_disable_ip+0x120/0x720 net/ipv6/route.c:4956
addrconf_ifdown+0x15d/0x1880 net/ipv6/addrconf.c:3857
addrconf_notify+0x1bc/0x1010 net/ipv6/addrconf.c:-1
notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
call_netdevice_notifiers net/core/dev.c:2228 [inline]
dev_close_many+0x29c/0x410 net/core/dev.c:1731
unregister_netdevice_many_notify+0x834/0x2330 net/core/dev.c:11942
cleanup_net+0x6a3/0xbd0 net/core/net_namespace.c:649
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xade/0x17a0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
=============================
WARNING: suspicious RCU usage
6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 Not tainted
-----------------------------
net/ipv6/ip6_fib.c:1059 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
6 locks held by kworker/u8:0/10623:
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc900038afc60 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319
#2: ffffffff8f2dbd50 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x145/0xbd0 net/core/net_namespace.c:608
#3: ffffffff8f2e8888 (rtnl_mutex){+.+.}-{4:4}, at: cleanup_net+0x611/0xbd0 net/core/net_namespace.c:644
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#4: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: __fib6_clean_all+0x9b/0x380 net/ipv6/ip6_fib.c:2263
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#5: ffff88805a2c7c30 (&tb->tb6_lock){+.-.}-{3:3}, at: __fib6_clean_all+0x1ce/0x380 net/ipv6/ip6_fib.c:2267
stack backtrace:
CPU: 0 UID: 0 PID: 10623 Comm: kworker/u8:0 Not tainted 6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: netns cleanup_net
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
lockdep_rcu_suspicious+0x140/0x1d0 kernel/locking/lockdep.c:6865
fib6_purge_rt+0x604/0x830 net/ipv6/ip6_fib.c:1058
fib6_del_route net/ipv6/ip6_fib.c:1995 [inline]
fib6_del+0xee1/0x1550 net/ipv6/ip6_fib.c:2040
fib6_clean_node+0x29f/0x590 net/ipv6/ip6_fib.c:2202
fib6_walk_continue+0x67b/0x910 net/ipv6/ip6_fib.c:2124
fib6_walk+0x149/0x290 net/ipv6/ip6_fib.c:2172
fib6_clean_tree net/ipv6/ip6_fib.c:2252 [inline]
__fib6_clean_all+0x234/0x380 net/ipv6/ip6_fib.c:2268
rt6_sync_down_dev net/ipv6/route.c:4951 [inline]
rt6_disable_ip+0x120/0x720 net/ipv6/route.c:4956
addrconf_ifdown+0x15d/0x1880 net/ipv6/addrconf.c:3857
addrconf_notify+0x1bc/0x1010 net/ipv6/addrconf.c:-1
notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
call_netdevice_notifiers net/core/dev.c:2228 [inline]
dev_close_many+0x29c/0x410 net/core/dev.c:1731
unregister_netdevice_many_notify+0x834/0x2330 net/core/dev.c:11942
cleanup_net+0x6a3/0xbd0 net/core/net_namespace.c:649
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xade/0x17a0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
==================================================================
BUG: KASAN: slab-use-after-free in call_fib6_entry_notifiers net/ipv6/ip6_fib.c:396 [inline]
BUG: KASAN: slab-use-after-free in fib6_del_route net/ipv6/ip6_fib.c:1999 [inline]
BUG: KASAN: slab-use-after-free in fib6_del+0x13af/0x1550 net/ipv6/ip6_fib.c:2040
Read of size 4 at addr ffff88807c01452c by task kworker/u8:0/10623
CPU: 0 UID: 0 PID: 10623 Comm: kworker/u8:0 Not tainted 6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: netns cleanup_net
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xb4/0x290 mm/kasan/report.c:521
kasan_report+0x118/0x150 mm/kasan/report.c:634
call_fib6_entry_notifiers net/ipv6/ip6_fib.c:396 [inline]
fib6_del_route net/ipv6/ip6_fib.c:1999 [inline]
fib6_del+0x13af/0x1550 net/ipv6/ip6_fib.c:2040
fib6_clean_node+0x29f/0x590 net/ipv6/ip6_fib.c:2202
fib6_walk_continue+0x67b/0x910 net/ipv6/ip6_fib.c:2124
fib6_walk+0x149/0x290 net/ipv6/ip6_fib.c:2172
fib6_clean_tree net/ipv6/ip6_fib.c:2252 [inline]
__fib6_clean_all+0x234/0x380 net/ipv6/ip6_fib.c:2268
rt6_sync_down_dev net/ipv6/route.c:4951 [inline]
rt6_disable_ip+0x120/0x720 net/ipv6/route.c:4956
addrconf_ifdown+0x15d/0x1880 net/ipv6/addrconf.c:3857
addrconf_notify+0x1bc/0x1010 net/ipv6/addrconf.c:-1
notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
call_netdevice_notifiers net/core/dev.c:2228 [inline]
dev_close_many+0x29c/0x410 net/core/dev.c:1731
unregister_netdevice_many_notify+0x834/0x2330 net/core/dev.c:11942
cleanup_net+0x6a3/0xbd0 net/core/net_namespace.c:649
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xade/0x17a0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Allocated by task 5820:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394
kasan_kmalloc include/linux/kasan.h:260 [inline]
__kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4358
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
binderfs_binder_device_create+0x17f/0xaf0 drivers/android/binderfs.c:147
binderfs_fill_super+0xa0e/0xe90 drivers/android/binderfs.c:730
vfs_get_super fs/super.c:1280 [inline]
get_tree_nodev+0xbb/0x150 fs/super.c:1299
vfs_get_tree+0x92/0x2b0 fs/super.c:1759
do_new_mount+0x24a/0xa40 fs/namespace.c:3881
do_mount fs/namespace.c:4221 [inline]
__do_sys_mount fs/namespace.c:4432 [inline]
__se_sys_mount+0x317/0x410 fs/namespace.c:4409
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 24:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x62/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2380 [inline]
slab_free mm/slub.c:4642 [inline]
kfree+0x193/0x440 mm/slub.c:4841
binder_free_proc drivers/android/binder.c:5248 [inline]
binder_proc_dec_tmpref+0x228/0x4f0 drivers/android/binder.c:1565
binder_deferred_release drivers/android/binder.c:6292 [inline]
binder_deferred_func+0x13a5/0x1520 drivers/android/binder.c:6319
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xade/0x17a0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
The buggy address belongs to the object at ffff88807c014400
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 300 bytes inside of
freed 512-byte region [ffff88807c014400, ffff88807c014600)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7c014
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801a041c80 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801a041c80 0000000000000000 dead000000000001
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0001f00501 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5820, tgid 5820 (syz-executor), ts 96299653284, free_ts 96118075967
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1d8/0x230 mm/page_alloc.c:1714
prep_new_page mm/page_alloc.c:1722 [inline]
get_page_from_freelist+0x21c7/0x22a0 mm/page_alloc.c:3684
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4966
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2301
alloc_slab_page mm/slub.c:2450 [inline]
allocate_slab+0x8a/0x3b0 mm/slub.c:2618
new_slab mm/slub.c:2672 [inline]
___slab_alloc+0xbfc/0x1480 mm/slub.c:3858
__slab_alloc mm/slub.c:3948 [inline]
__slab_alloc_node mm/slub.c:4023 [inline]
slab_alloc_node mm/slub.c:4184 [inline]
__kmalloc_cache_noprof+0x296/0x3d0 mm/slub.c:4353
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
binderfs_binder_ctl_create drivers/android/binderfs.c:410 [inline]
binderfs_fill_super+0x59f/0xe90 drivers/android/binderfs.c:723
vfs_get_super fs/super.c:1280 [inline]
get_tree_nodev+0xbb/0x150 fs/super.c:1299
vfs_get_tree+0x92/0x2b0 fs/super.c:1759
do_new_mount+0x24a/0xa40 fs/namespace.c:3881
do_mount fs/namespace.c:4221 [inline]
__do_sys_mount fs/namespace.c:4432 [inline]
__se_sys_mount+0x317/0x410 fs/namespace.c:4409
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5189 tgid 5189 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1258 [inline]
__free_frozen_pages+0xb05/0xcd0 mm/page_alloc.c:2721
discard_slab mm/slub.c:2716 [inline]
__put_partials+0x161/0x1c0 mm/slub.c:3185
put_cpu_partial+0x17c/0x250 mm/slub.c:3260
__slab_free+0x2f7/0x400 mm/slub.c:4512
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4147 [inline]
slab_alloc_node mm/slub.c:4196 [inline]
__do_kmalloc_node mm/slub.c:4326 [inline]
__kmalloc_noprof+0x224/0x4f0 mm/slub.c:4339
kmalloc_noprof include/linux/slab.h:909 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
tomoyo_encode2 security/tomoyo/realpath.c:45 [inline]
tomoyo_encode+0x28b/0x550 security/tomoyo/realpath.c:80
tomoyo_realpath_from_path+0x58d/0x5d0 security/tomoyo/realpath.c:283
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_check_open_permission+0x1c1/0x3b0 security/tomoyo/file.c:771
security_file_open+0xb1/0x270 security/security.c:3114
do_dentry_open+0x35e/0x1970 fs/open.c:933
vfs_open+0x3b/0x340 fs/open.c:1086
do_open fs/namei.c:3880 [inline]
path_openat+0x2ee5/0x3830 fs/namei.c:4039
do_filp_open+0x1fa/0x410 fs/namei.c:4066
Memory state around the buggy address:
ffff88807c014400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807c014480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807c014500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807c014580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807c014600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================