watchdog: BUG: soft lockup - CPU#1 stuck for 246s! [syz.3.2153:8385]
Modules linked in:
CPU: 1 PID: 8385 Comm: syz.3.2153 Not tainted 6.1.138-syzkaller-00013-gf6c21bc9a693 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:434 [inline]
RIP: 0010:__pv_queued_spin_lock_slowpath+0x591/0xc40 kernel/locking/qspinlock.c:511
Code: 0f 85 33 01 00 00 41 c6 45 00 00 41 0f b6 04 17 84 c0 0f 85 46 01 00 00 48 8b 44 24 10 c6 00 01 41 bd 00 80 ff ff eb 07 f3 90 <41> ff c5 74 5b 41 0f b6 04 16 84 c0 75 35 80 3b 00 75 eb 48 89 df
RSP: 0018:ffffc90000a376c0 EFLAGS: 00000206
RAX: 0000000000000004 RBX: ffffffff879c5f00 RCX: 00000000879c5f00
RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffffffff879c5f00
RBP: ffffc90000a377b0 R08: 0000000000000004 R09: 0000000000000000
R10: fffffbfff0f38be0 R11: 1ffffffff0f38be0 R12: 1ffff1103ee20001
R13: 00000000ffffc7a4 R14: 1ffffffff0f38be0 R15: 1ffffffff0f38be0
FS:  00007f478eca66c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c29625c CR3: 0000000120e0c000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [inline]
 queued_spin_lock_slowpath+0x47/0x50 arch/x86/include/asm/qspinlock.h:51
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock include/linux/spinlock.h:187 [inline]
 __raw_spin_lock include/linux/spinlock_api_smp.h:134 [inline]
 _raw_spin_lock+0xd8/0xe0 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 unregister_sysctl_table+0x6d/0x120 fs/proc/proc_sysctl.c:1764
 unregister_net_sysctl_table+0x15/0x20 net/sysctl_net.c:175
 sysctl_route_net_exit+0x5c/0x80 net/ipv4/route.c:3665
 ops_exit_list net/core/net_namespace.c:172 [inline]
 setup_net+0x84d/0xcb0 net/core/net_namespace.c:358
 copy_net_ns+0x355/0x5c0 net/core/net_namespace.c:481
 create_new_namespaces+0x3a2/0x660 kernel/nsproxy.c:110
 copy_namespaces+0x1d1/0x220 kernel/nsproxy.c:178
 copy_process+0x12d4/0x3470 kernel/fork.c:2374
 kernel_clone+0x23a/0x810 kernel/fork.c:2787
 __do_sys_clone kernel/fork.c:2930 [inline]
 __se_sys_clone kernel/fork.c:2914 [inline]
 __x64_sys_clone+0x168/0x1b0 kernel/fork.c:2914
 x64_sys_call+0x990/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:57
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f478dd8e929
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f478eca5fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f478dfb6160 RCX: 00007f478dd8e929
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000640c7000
RBP: 00007f478de10b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f478dfb6160 R15: 00007ffed2fbd0f8
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 463 Comm: kworker/u4:13 Not tainted 6.1.138-syzkaller-00013-gf6c21bc9a693 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: netns cleanup_net
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+0xcc/0x140 arch/x86/kernel/kvm.c:1058
Code: 20 f6 44 24 21 02 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 a6 66 90 0f 00 2d d5 ae 13 04 f4 <eb> 9a fa 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 3f 0f b6 07
RSP: 0018:ffffc9000e5c71e0 EFLAGS: 00000046
RAX: 0000000000000003 RBX: ffff8881f7027a80 RCX: ffffffff84f00542
RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffff8881f7027a80
RBP: ffffc9000e5c7270 R08: dffffc0000000000 R09: ffffed103ee04f51
R10: ffffed103ee04f51 R11: 1ffff1103ee04f50 R12: 1ffff1103ee00001
R13: ffff8881f7038c94 R14: dffffc0000000000 R15: 1ffff92001cb8e3c
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000013268c000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 pv_wait arch/x86/include/asm/paravirt.h:603 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
 __pv_queued_spin_lock_slowpath+0x690/0xc40 kernel/locking/qspinlock.c:511
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [inline]
 queued_spin_lock_slowpath+0x47/0x50 arch/x86/include/asm/qspinlock.h:51
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock include/linux/spinlock.h:187 [inline]
 __raw_spin_lock include/linux/spinlock_api_smp.h:134 [inline]
 _raw_spin_lock+0xd8/0xe0 kernel/locking/spinlock.c:154
 krc_this_cpu_lock kernel/rcu/tree.c:3035 [inline]
 add_ptr_to_bulk_krc_lock kernel/rcu/tree.c:3355 [inline]
 kvfree_call_rcu+0x100/0x7a0 kernel/rcu/tree.c:3446
 trie_delete_elem+0x572/0x720 kernel/bpf/lpm_trie.c:545
 bpf_prog_2c29ac5cdc6b1842+0x3a/0x3e
 bpf_dispatcher_nop_func include/linux/bpf.h:987 [inline]
 __bpf_prog_run include/linux/filter.h:596 [inline]
 bpf_prog_run include/linux/filter.h:610 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2283 [inline]
 bpf_trace_run3+0x1c6/0x270 kernel/trace/bpf_trace.c:2323
 __bpf_trace_timer_start+0x2b/0x40 include/trace/events/timer.h:53
 trace_timer_start include/trace/events/timer.h:53 [inline]
 enqueue_timer+0x337/0x480 kernel/time/timer.c:615
 __mod_timer+0x79f/0xb30 kernel/time/timer.c:-1
 add_timer+0x68/0x80 kernel/time/timer.c:1218
 __queue_delayed_work+0x173/0x200 kernel/workqueue.c:1686
 mod_delayed_work_on+0x74/0xe0 kernel/workqueue.c:1749
 mod_delayed_work include/linux/workqueue.h:540 [inline]
 schedule_delayed_monitor_work kernel/rcu/tree.c:3213 [inline]
 kvfree_call_rcu+0x560/0x7a0 kernel/rcu/tree.c:3472
 drop_sysctl_table+0x2ef/0x410 fs/proc/proc_sysctl.c:1727
 drop_sysctl_table+0x2de/0x410 fs/proc/proc_sysctl.c:1730
 unregister_sysctl_table+0x75/0x120 fs/proc/proc_sysctl.c:1765
 unregister_net_sysctl_table+0x15/0x20 net/sysctl_net.c:175
 __devinet_sysctl_unregister net/ipv4/devinet.c:2636 [inline]
 devinet_exit_net+0x1a1/0x220 net/ipv4/devinet.c:2781
 ops_exit_list net/core/net_namespace.c:172 [inline]
 cleanup_net+0x5ad/0xb00 net/core/net_namespace.c:604
 process_one_work+0x71f/0xc40 kernel/workqueue.c:2299
 worker_thread+0xa29/0x11f0 kernel/workqueue.c:2446
 kthread+0x281/0x320 kernel/kthread.c:386
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>