watchdog: BUG: soft lockup - CPU#1 stuck for 225s! [syz.1.59:611]
Modules linked in:
CPU: 1 PID: 611 Comm: syz.1.59 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:csd_lock_wait kernel/smp.c:453 [inline]
RIP: 0010:smp_call_function_many_cond+0x893/0x980 kernel/smp.c:998
Code: e6 01 31 ff e8 8e 75 09 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 0a e8 5a 71 09 00 e9 38 ff ff ff f3 90 41 0f b6 44 1d 00 <84> c0 75 14 41 f7 07 01 00 00 00 0f 84 1a ff ff ff e8 37 71 09 00
RSP: 0018:ffffc900011677c0 EFLAGS: 00000293
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff88811e7fe540
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900011678f8 R08: ffff8881f6f390d7 R09: 1ffff1103ede721a
R10: 0000000000000000 R11: ffffffff8134c3d0 R12: 1ffff1103ede7218
R13: 1ffff1103edc7ae1 R14: 0000000000000000 R15: ffff8881f6e3d708
FS:  0000555572874500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000010000 CR3: 00000001096dd000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x43/0x80 kernel/smp.c:1165
 on_each_cpu include/linux/smp.h:71 [inline]
 text_poke_sync arch/x86/kernel/alternative.c:1574 [inline]
 text_poke_bp_batch+0x1cf/0x600 arch/x86/kernel/alternative.c:1774
 text_poke_flush arch/x86/kernel/alternative.c:1965 [inline]
 text_poke_finish+0x1a/0x30 arch/x86/kernel/alternative.c:1972
 arch_jump_label_transform_apply+0x15/0x30 arch/x86/kernel/jump_label.c:146
 __jump_label_update+0x37c/0x3a0 kernel/jump_label.c:451
 jump_label_update+0x39b/0x450 kernel/jump_label.c:797
 static_key_disable_cpuslocked+0xc9/0x1a0 kernel/jump_label.c:203
 static_key_disable+0x1a/0x30 kernel/jump_label.c:211
 tracepoint_remove_func kernel/tracepoint.c:417 [inline]
 tracepoint_probe_unregister+0x641/0x8e0 kernel/tracepoint.c:551
 bpf_probe_unregister+0x61/0x70 kernel/trace/bpf_trace.c:2359
 bpf_raw_tp_link_release+0x63/0x90 kernel/bpf/syscall.c:3173
 bpf_link_free+0x13a/0x3a0 kernel/bpf/syscall.c:2742
 bpf_link_put kernel/bpf/syscall.c:2768 [inline]
 bpf_link_release+0x15f/0x170 kernel/bpf/syscall.c:2777
 __fput+0x1fc/0x8f0 fs/file_table.c:320
 ____fput+0x15/0x20 fs/file_table.c:348
 task_work_run+0x1e1/0x250 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x9b/0xb0 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f867c99a079
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:00007ffe253e6228 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffe253e6310 RCX: 00007f867c99a079
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 000000000000c707 R08: 0000000000000001 R09: 0000000000000000
R10: 00007f867c600000 R11: 0000000000000246 R12: 00007ffe253e6350
R13: 00007f867cbc5fac R14: 000000000000c78a R15: 00007f867cbc5fa0
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 43 Comm: kworker/u4:2 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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+0xdf/0x150 arch/x86/kernel/kvm.c:1058
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 52 09 33 04 f4 <eb> 87 fa 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 3f 0f b6 07
RSP: 0018:ffffc900002ceec0 EFLAGS: 00000046
RAX: 0000000000000003 RBX: ffff8881f6e27a80 RCX: ffffffff85007792
RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffff8881f6e27a80
RBP: ffffc900002cef50 R08: ffff8881f6e27a80 R09: 1ffff1103edc4f50
R10: dffffc0000000000 R11: ffffed103edc4f51 R12: 1ffff1103edc0001
R13: ffff8881f6e38cd4 R14: dffffc0000000000 R15: 1ffff92000059dd8
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000010fd8b000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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+0xe4/0xf0 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+0x107/0x7c0 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:607 [inline]
 bpf_prog_run include/linux/filter.h:614 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2283 [inline]
 bpf_trace_run3+0x123/0x2b0 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
 internal_add_timer kernel/time/timer.c:640 [inline]
 __mod_timer+0x84c/0xc00 kernel/time/timer.c:1137
 add_timer+0x68/0x80 kernel/time/timer.c:1250
 __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+0x579/0x7c0 kernel/rcu/tree.c:3472
 inet6_ifa_finish_destroy+0x129/0x1b0 net/ipv6/addrconf.c:1007
 in6_ifa_put include/net/addrconf.h:459 [inline]
 addrconf_ifdown+0x1265/0x1950 net/ipv6/addrconf.c:3960
 addrconf_notify+0x39f/0xe40 net/ipv6/addrconf.c:-1
 notifier_call_chain kernel/notifier.c:87 [inline]
 raw_notifier_call_chain+0xa1/0x110 kernel/notifier.c:455
 call_netdevice_notifiers_info net/core/dev.c:2009 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2047 [inline]
 call_netdevice_notifiers net/core/dev.c:2061 [inline]
 dev_close_many+0x32e/0x4d0 net/core/dev.c:1609
 unregister_netdevice_many+0x44f/0x18e0 net/core/dev.c:10941
 default_device_exit_batch+0x9dc/0xa70 net/core/dev.c:11480
 ops_exit_list net/core/net_namespace.c:177 [inline]
 cleanup_net+0x635/0xb10 net/core/net_namespace.c:604
 process_one_work+0x71f/0xc40 kernel/workqueue.c:2302
 worker_thread+0xa29/0x11e0 kernel/workqueue.c:2449
 kthread+0x281/0x320 kernel/kthread.c:386
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>