watchdog: BUG: soft lockup - CPU#0 stuck for 246s! [syz.4.2366:8689]
Modules linked in:
CPU: 0 PID: 8689 Comm: syz.4.2366 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:csd_lock_wait kernel/smp.c:453 [inline]
RIP: 0010:smp_call_function_many_cond+0x872/0x960 kernel/smp.c:998
Code: 41 8b 1f 89 de 83 e6 01 31 ff e8 99 65 09 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 0a e8 65 61 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
RSP: 0018:ffffc9000e45f4a0 EFLAGS: 00000246
RAX: ffffffff8166c8be RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc9000eb37000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000e45f5d8 R08: dffffc0000000000 R09: fffffbfff0ee4f16
R10: 0000000000000000 R11: 1ffffffff0ee4f15 R12: 1ffff1103ee07218
R13: 1ffff1103ee278a5 R14: 0000000000000001 R15: ffff8881f713c528
FS:  00007f15947f76c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000000 CR3: 0000000132071000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
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+0x1cc/0x580 arch/x86/kernel/alternative.c:1774
 text_poke_bp+0xc8/0x140 arch/x86/kernel/alternative.c:2011
 __static_call_transform+0x318/0x500 arch/x86/kernel/static_call.c:109
 arch_static_call_transform+0xd3/0x280 arch/x86/kernel/static_call.c:161
 __static_call_update+0xef/0x5c0 kernel/static_call_inline.c:136
 tracepoint_update_call kernel/tracepoint.c:317 [inline]
 tracepoint_add_func+0x650/0x900 kernel/tracepoint.c:365
 tracepoint_probe_register_prio_may_exist+0x5b/0x90 kernel/tracepoint.c:482
 tracepoint_probe_register_may_exist include/linux/tracepoint.h:52 [inline]
 __bpf_probe_register kernel/trace/bpf_trace.c:2348 [inline]
 bpf_probe_register+0x13f/0x1d0 kernel/trace/bpf_trace.c:2354
 bpf_raw_tp_link_attach+0x3d1/0x550 kernel/bpf/syscall.c:3367
 bpf_raw_tracepoint_open+0x258/0x480 kernel/bpf/syscall.c:3394
 __sys_bpf+0x4d1/0x780 kernel/bpf/syscall.c:5044
 __do_sys_bpf kernel/bpf/syscall.c:5106 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5104 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5104
 x64_sys_call+0x488/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322
 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: 0033:0x7f1595d8f749
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:00007f15947f7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f1595fe5fa0 RCX: 00007f1595d8f749
RDX: 0000000000000010 RSI: 0000200000000080 RDI: 0000000000000011
RBP: 00007f1595e13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1595fe6038 R14: 00007f1595fe5fa0 R15: 00007ffd19ffdd78
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4769 Comm: kworker/u4:21 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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 95 96 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:ffffc900010ff0c0 EFLAGS: 00000046
RAX: 0000000000000003 RBX: ffff8881185d2140 RCX: ffffffff84f49de2
RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffff8881185d2140
RBP: ffffc900010ff150 R08: dffffc0000000000 R09: ffffed10230ba429
R10: ffffed10230ba429 R11: 1ffff110230ba428 R12: 1ffff1103ee20001
R13: ffff8881f7138cf4 R14: dffffc0000000000 R15: 1ffff9200021fe18
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e723ffc CR3: 000000012f399000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 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_irqsave include/linux/spinlock_api_smp.h:111 [inline]
 _raw_spin_lock_irqsave+0x108/0x110 kernel/locking/spinlock.c:162
 __stack_map_get+0xec/0x3c0 kernel/bpf/queue_stack_maps.c:144
 stack_map_peek_elem+0x1f/0x30 kernel/bpf/queue_stack_maps.c:177
 bpf_prog_00798911c748094f+0x3a/0x3e
 bpf_dispatcher_nop_func include/linux/bpf.h:987 [inline]
 __bpf_prog_run include/linux/filter.h:603 [inline]
 bpf_prog_run include/linux/filter.h:610 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2283 [inline]
 bpf_trace_run2+0xff/0x250 kernel/trace/bpf_trace.c:2322
 __bpf_trace_contention_end+0xb/0x10 include/trace/events/lock.h:122
 trace_contention_end include/trace/events/lock.h:122 [inline]
 __pv_queued_spin_lock_slowpath+0xbff/0xc40 kernel/locking/qspinlock.c:560
 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_irqsave include/linux/spinlock_api_smp.h:111 [inline]
 _raw_spin_lock_irqsave+0x108/0x110 kernel/locking/spinlock.c:162
 __stack_map_get+0xec/0x3c0 kernel/bpf/queue_stack_maps.c:144
 stack_map_peek_elem+0x1f/0x30 kernel/bpf/queue_stack_maps.c:177
 bpf_prog_00798911c748094f+0x3a/0x3e
 bpf_dispatcher_nop_func include/linux/bpf.h:987 [inline]
 __bpf_prog_run include/linux/filter.h:603 [inline]
 bpf_prog_run include/linux/filter.h:610 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2283 [inline]
 bpf_trace_run3+0x113/0x270 kernel/trace/bpf_trace.c:2323
 __bpf_trace_percpu_free_percpu+0x2d/0x40 include/trace/events/percpu.h:54
 trace_percpu_free_percpu include/trace/events/percpu.h:54 [inline]
 free_percpu+0xd09/0x1020 mm/percpu.c:2310
 vti6_dev_free+0x3b/0x40 net/ipv6/ip6_vti.c:179
 netdev_run_todo+0xa72/0xc00 net/core/dev.c:10474
 rtnl_unlock+0xe/0x10 net/core/rtnetlink.c:147
 vti6_exit_batch_net+0x26f/0x2b0 net/ipv6/ip6_vti.c:1192
 ops_exit_list net/core/net_namespace.c:177 [inline]
 cleanup_net+0x62d/0xb00 net/core/net_namespace.c:604
 process_one_work+0x71f/0xc40 kernel/workqueue.c:2302
 worker_thread+0xa29/0x11f0 kernel/workqueue.c:2449
 kthread+0x281/0x320 kernel/kthread.c:386
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>