INFO: task kworker/u8:61:611 blocked for more than 124 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:61 state:D stack:0 pid:611 tgid:611 ppid:2 flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
context_switch kernel/sched/core.c:6063 [inline]
__schedule+0x1496/0x20b0 kernel/sched/core.c:7883
__schedule_loop kernel/sched/core.c:7960 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7975
schedule_timeout+0xc7/0x3b0 kernel/time/timer.c:2596
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common+0x368/0x650 kernel/sched/completion.c:127
wait_for_completion+0x1c/0x40 kernel/sched/completion.c:148
rcu_barrier+0x45a/0x580 kernel/rcu/tree.c:4657
netdev_run_todo+0x118/0xce0 net/core/dev.c:10912
rtnl_unlock+0x12/0x20 net/core/rtnetlink.c:152
cleanup_net+0x645/0xc90 net/core/net_namespace.c:638
process_one_work kernel/workqueue.c:3273 [inline]
process_scheduled_works+0x7f4/0x1060 kernel/workqueue.c:3354
worker_thread+0xc99/0x13f0 kernel/workqueue.c:3435
kthread+0x2c4/0x360 kernel/kthread.c:389
ret_from_fork+0x64/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 e67cc5743245539115c479145c763e2a95730d6f
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
__dump_stack+0x21/0x30 lib/dump_stack.c:94
dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120
dump_stack+0x19/0x20 lib/dump_stack.c:129
nmi_cpu_backtrace+0x2ba/0x2d0 lib/nmi_backtrace.c:114
nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:63
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
cpumask_backtrace+0x1f/0x30 lib/nmi_backtrace.c:127
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline]
watchdog+0xe45/0xf90 kernel/hung_task.c:423
kthread+0x2c4/0x360 kernel/kthread.c:389
ret_from_fork+0x64/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 286 Comm: sshd-session Not tainted syzkaller #0 e67cc5743245539115c479145c763e2a95730d6f
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:task_stack_page include/linux/sched/task_stack.h:23 [inline]
RIP: 0010:last_frame arch/x86/kernel/unwind_frame.c:82 [inline]
RIP: 0010:is_last_frame arch/x86/kernel/unwind_frame.c:87 [inline]
RIP: 0010:is_last_task_frame arch/x86/kernel/unwind_frame.c:156 [inline]
RIP: 0010:unwind_next_frame+0xe4/0x6b0 arch/x86/kernel/unwind_frame.c:276
Code: 89 45 b8 42 80 3c 30 00 74 08 4c 89 ef e8 74 cc 9b 00 49 8b 45 00 48 89 45 d0 4c 8d 68 20 4c 89 e8 48 c1 e8 03 42 80 3c 30 00 <74> 08 4c 89 ef e8 52 cc 9b 00 49 8b 7d 00 4c 8d af 00 80 00 00 48
RSP: 0018:ffffc900011bf628 EFLAGS: 00000246
RAX: 1ffff11020f5f004 RBX: ffffc900011bf688 RCX: 0000000000237e00
RDX: dffffc0000000000 RSI: ffffffff81dc8315 RDI: ffffc900011bf6c0
RBP: ffffc900011bf678 R08: ffffc900011bf750 R09: ffffc900011bf748
R10: 0000000000000004 R11: ffffffff8175a7a0 R12: ffffc900011bfb28
R13: ffff888107af8020 R14: dffffc0000000000 R15: 0000000000000000
FS: 00007f85bc624300(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f85bbff84c0 CR3: 00000001222fa000 CR4: 00000000003526b0
Call Trace:
arch_stack_walk+0x138/0x170 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
save_stack+0x125/0x240 mm/page_owner.c:174
__reset_page_owner+0x79/0x450 mm/page_owner.c:315
reset_page_owner include/linux/page_owner.h:28 [inline]
free_pages_prepare mm/page_alloc.c:1390 [inline]
free_unref_page+0xbb8/0xf70 mm/page_alloc.c:2876
__free_pages+0x6b/0x3b0 mm/page_alloc.c:5402
__free_slab+0xb2/0x110 mm/slub.c:2758
free_slab+0x18/0xe0 mm/slub.c:2781
discard_slab mm/slub.c:2787 [inline]
__put_partials+0x115/0x150 mm/slub.c:3256
put_cpu_partial+0x91/0xc0 mm/slub.c:3331
__slab_free+0x1cf/0x2a0 mm/slub.c:4584
do_slab_free mm/slub.c:4666 [inline]
___cache_free+0xc9/0xe0 mm/slub.c:4781
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0xb5/0x130 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x14f/0x180 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x28/0x90 mm/kasan/common.c:331
kasan_slab_alloc include/linux/kasan.h:251 [inline]
slab_post_alloc_hook mm/slub.c:4202 [inline]
slab_alloc_node mm/slub.c:4251 [inline]
kmem_cache_alloc_noprof+0x1bf/0x410 mm/slub.c:4260
lsm_inode_alloc security/security.c:757 [inline]
security_inode_alloc+0x51/0x230 security/security.c:1697
inode_init_always_gfp+0x756/0x9e0 fs/inode.c:239
inode_init_always include/linux/fs.h:3127 [inline]
alloc_inode+0xc5/0x270 fs/inode.c:276
new_inode_pseudo+0x19/0x40 fs/inode.c:1117
sock_alloc net/socket.c:616 [inline]
__sock_create+0x130/0x810 net/socket.c:1522
sock_create net/socket.c:1616 [inline]
__sys_socket_create net/socket.c:1653 [inline]
__sys_socket+0xe1/0x1c0 net/socket.c:1700
__do_sys_socket net/socket.c:1714 [inline]
__se_sys_socket net/socket.c:1712 [inline]
__x64_sys_socket+0x7e/0x90 net/socket.c:1712
x64_sys_call+0x2608/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:42
do_syscall_x64 arch/x86/entry/common.c:47 [inline]
do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f85bbf22707
Code: 54 24 0c e8 6b ac ff ff 83 f8 ff 74 04 8b 44 24 0c 48 83 c4 18 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 b8 29 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d c1 e6 0c 00 f7 d8 64 89 01 48
RSP: 002b:00007fff910d36a8 EFLAGS: 00000202 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 0000000000000026 RCX: 00007f85bbf22707
RDX: 0000000000000000 RSI: 0000000000080002 RDI: 0000000000000001
RBP: 00007f85bbfae560 R08: 00000000000001f4 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000002
R13: 00007fff910d37d0 R14: 0000000000000049 R15: 00007fff910d37d0
net_ratelimit: 76674 callbacks suppressed
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:96:59:85:49:d1:b2, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:96:59:85:49:d1:b2, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
net_ratelimit: 85768 callbacks suppressed
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:96:59:85:49:d1:b2, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:96:59:85:49:d1:b2, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)