worker_thread+0xa59/0x1200 kernel/workqueue.c:2472
kthread+0x411/0x500 kernel/kthread.c:337
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
watchdog: BUG: soft lockup - CPU#1 stuck for 245s! [kworker/u4:3:342]
Modules linked in:
CPU: 1 PID: 342 Comm: kworker/u4:3 Tainted: G W syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: netns cleanup_net
RIP: 0010:csd_lock_wait kernel/smp.c:440 [inline]
RIP: 0010:smp_call_function_single+0x211/0x490 kernel/smp.c:758
Code: ff e8 d3 60 0a 00 41 83 e6 01 49 bc 00 00 00 00 00 fc ff df 75 0a e8 0e 5d 0a 00 e9 a4 00 00 00 f3 90 f7 44 24 48 01 00 00 00 <0f> 84 8f 00 00 00 e8 f4 5c 0a 00 eb e9 e8 ed 02 4f 03 89 c3 41 89
RSP: 0018:ffffc90007a678c0 EFLAGS: 00000202
RAX: ffffffff815f700c RBX: 0000000000000000 RCX: ffff88810d4de2c0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90007a679b0 R08: ffff8881f7038ec7 R09: 1ffff1103ee071d8
R10: dffffc0000000000 R11: ffffed103ee071d9 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff92000f4cf1c
FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000001f3000 CR3: 000000011c3a6000 CR4: 00000000003506a0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
rcu_barrier+0x213/0x400 kernel/rcu/tree.c:4129
netdev_run_todo+0x116/0x9b0 net/core/dev.c:10683
rtnl_unlock+0xe/0x10 net/core/rtnetlink.c:112
default_device_exit_batch+0x363/0x3c0 net/core/dev.c:11697
ops_exit_list net/core/net_namespace.c:177 [inline]
cleanup_net+0x60a/0xae0 net/core/net_namespace.c:599
process_one_work+0x6be/0xba0 kernel/workqueue.c:2325
worker_thread+0xa59/0x1200 kernel/workqueue.c:2472
kthread+0x411/0x500 kernel/kthread.c:337
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 2319 Comm: syz.3.555 Tainted: G W syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:native_halt arch/x86/include/asm/irqflags.h:57 [inline]
RIP: 0010:halt arch/x86/include/asm/irqflags.h:98 [inline]
RIP: 0010:kvm_wait+0xdf/0x150 arch/x86/kernel/kvm.c:912
Code: 43 c6 44 37 04 f8 75 24 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 48 0f b6 07 40 38 f0 75 93 66 90 0f 00 2d 42 1d d6 03 f4 87 fa 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 3f 0f b6 07
RSP: 0018:ffffc900014b7520 EFLAGS: 00000046
RAX: 0000000000000003 RBX: ffff888113f4b06c RCX: ffffffff81500909
RDX: 0000000000000001 RSI: 0000000000000003 RDI: ffff888113f4b06c
RBP: ffffc900014b75b0 R08: ffff888113f4b06c R09: 1ffff110227e960d
R10: dffffc0000000000 R11: ffffed10227e960e R12: 1ffff1103ee00001
R13: ffff8881f7038ad4 R14: dffffc0000000000 R15: 1ffff92000296ea4
FS: 00007f77af29a6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000172000 CR3: 000000012be8a000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
pv_wait arch/x86/include/asm/paravirt.h:597 [inline]
pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
__pv_queued_spin_lock_slowpath+0x60f/0x9c0 kernel/locking/qspinlock.c:508
pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:585 [inline]
queued_spin_lock_slowpath+0x47/0x50 arch/x86/include/asm/qspinlock.h:51
queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
do_raw_spin_lock include/linux/spinlock.h:188 [inline]
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:129 [inline]
_raw_spin_lock_irq+0xe5/0xf0 kernel/locking/spinlock.c:170
get_wchan kernel/sched/core.c:2021 [inline]
perf_trace_sched_blocked_reason+0x24f/0x4b0 include/trace/events/sched.h:490
trace_sched_blocked_reason include/trace/events/sched.h:490 [inline]
try_to_wake_up+0xea1/0x1160 kernel/sched/core.c:4190
wake_up_process kernel/sched/core.c:4348 [inline]
wake_up_q+0xdf/0x1c0 kernel/sched/core.c:975
__mutex_unlock_slowpath+0x298/0x3f0 kernel/locking/mutex.c:923
mutex_unlock+0xe4/0x230 kernel/locking/mutex.c:557
__rtnl_unlock+0x2c/0x90 net/core/rtnetlink.c:98
netdev_run_todo+0xff/0x9b0 net/core/dev.c:10678
rtnl_unlock+0xe/0x10 net/core/rtnetlink.c:112
dev_ioctl+0x54d/0xd00 net/core/dev_ioctl.c:573
sock_do_ioctl+0x241/0x310 net/socket.c:1151
sock_ioctl+0x4a1/0x6e0 net/socket.c:1256
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl+0x121/0x1a0 fs/ioctl.c:860
__x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:860
x64_sys_call+0x2f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:17
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f77b083f629
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f77af29a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f77b0ab8fa0 RCX: 00007f77b083f629
RDX: 0000200000001000 RSI: 0000000000008914 RDI: 000000000000000b
RBP: 00007f77b08d5b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f77b0ab9038 R14: 00007f77b0ab8fa0 R15: 00007ffe62cf9f68