RBP: 00007f4bfd032d69 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4bfd216038 R14: 00007f4bfd215fa0 R15: 00007fffb5cdfdb8
</TASK>
watchdog: BUG: soft lockup - CPU#1 stuck for 287s! [syz.1.1512:5960]
Modules linked in:
CPU: 1 PID: 5960 Comm: syz.1.1512 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:182 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x10/0x60 kernel/kcov.c:216
Code: de e8 24 e2 44 00 5b 5d c3 00 90 90 90 90 90 90 90 90 90 90 90 b8 0c 67 40 a5 55 48 89 e5 48 8b 45 08 65 48 8b 0d 60 f7 90 7e <65> 8b 15 61 f7 90 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75
RSP: 0018:ffffc900001b0418 EFLAGS: 00000246
RAX: ffffffff8474a1d8 RBX: ffff8881145e3c80 RCX: ffff88813a5abcc0
RDX: ffff88813a5abcc0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900001b0418 R08: ffff8881145e3d77 R09: 1ffff110228bc7ae
R10: 0000000000000000 R11: ffffed10228bc7af R12: dffffc0000000000
R13: 1ffff110228bc79e R14: 0000000000000000 R15: ffffc9000007b000
FS: 00007f4bfde9e6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4bfde7dd58 CR3: 000000011704d000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>
bpf_prog_run_clear_cb include/linux/filter.h:782 [inline]
run_filter+0xa8/0x220 net/packet/af_packet.c:2137
packet_rcv+0x369/0x1390 net/packet/af_packet.c:2210
deliver_skb net/core/dev.c:2266 [inline]
deliver_ptype_list_skb net/core/dev.c:2281 [inline]
__netif_receive_skb_core+0x285d/0x35d0 net/core/dev.c:5574
__netif_receive_skb_list_core+0x24e/0x780 net/core/dev.c:5699
__netif_receive_skb_list net/core/dev.c:5766 [inline]
netif_receive_skb_list_internal+0x7f8/0xab0 net/core/dev.c:5857
gro_normal_list include/net/gro.h:433 [inline]
gro_normal_one include/net/gro.h:446 [inline]
napi_skb_finish net/core/gro.c:628 [inline]
napi_gro_receive+0x444/0x880 net/core/gro.c:658
receive_buf+0x207b/0x4960 drivers/net/virtio_net.c:1327
virtnet_receive drivers/net/virtio_net.c:1592 [inline]
virtnet_poll+0x5d3/0x1180 drivers/net/virtio_net.c:1710
__napi_poll+0xd0/0x5e0 net/core/dev.c:6632
napi_poll net/core/dev.c:6699 [inline]
net_rx_action+0x4b6/0xac0 net/core/dev.c:6813
handle_softirqs+0x1d7/0x600 kernel/softirq.c:642
__do_softirq kernel/softirq.c:680 [inline]
invoke_softirq kernel/softirq.c:497 [inline]
__irq_exit_rcu+0x52/0xf0 kernel/softirq.c:729
irq_exit_rcu+0x9/0x10 kernel/softirq.c:741
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa9/0xc0 arch/x86/kernel/apic/apic.c:1118
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:preempt_schedule_irq+0xa5/0x120 kernel/sched/core.c:7067
Code: 44 24 20 00 02 00 00 43 c6 44 37 04 f8 74 0b 0f 0b 48 f7 03 08 00 00 00 74 4d bf 01 00 00 00 e8 b1 00 4c fc fb bf 01 00 00 00 <e8> f6 e4 ff ff fa bf 01 00 00 00 e8 5b 02 4c fc 65 48 8b 1d 23 cb
RSP: 0018:ffffc90000a67ba0 EFLAGS: 00000246
RAX: 1ffff110274b58f1 RBX: ffffc90000a67c68 RCX: ffffffff87b7b100
RDX: 1ffffffff0f6e608 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffffc90000a67c18 R08: ffffffff87b73048 R09: ffffffff87b73058
R10: ffffffff87b73043 R11: 1ffffffff0f6e608 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff9200014cf74
raw_irqentry_exit_cond_resched+0x29/0x30 kernel/entry/common.c:396
irqentry_exit+0x37/0x40 kernel/entry/common.c:439
sysvec_apic_timer_interrupt+0x64/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__refcount_sub_and_test include/linux/refcount.h:282 [inline]
RIP: 0010:__refcount_dec_and_test include/linux/refcount.h:315 [inline]
RIP: 0010:refcount_dec_and_test include/linux/refcount.h:333 [inline]
RIP: 0010:put_task_struct+0x62/0x90 include/linux/sched/task.h:122
Code: 0b d9 ff 41 83 ff 01 75 0f e8 0a 07 d9 ff 4c 89 f7 e8 b2 af a8 ff eb 17 bf 01 00 00 00 44 89 fe e8 13 0b d9 ff 45 85 ff 7e 0c <e8> e9 06 d9 ff 5b 41 5e 41 5f 5d c3 e8 dd 06 d9 ff 48 89 df be 03
RSP: 0018:ffffc90000a67d18 EFLAGS: 00000202
RAX: ffffffff81986f5d RBX: ffff88813a5abce8 RCX: 0000000000000002
RDX: ffff88813a5abcc0 RSI: 0000000000000007 RDI: 0000000000000001
RBP: ffffc90000a67d30 R08: ffff88813a5abceb R09: 1ffff110274b579d
R10: dffffc0000000000 R11: ffffed10274b579e R12: 1ffff9200014cfb4
R13: 0000000000000000 R14: ffff88813a5abcc0 R15: 0000000000000007
__do_sys_perf_event_open kernel/events/core.c:12784 [inline]
__se_sys_perf_event_open+0x18bc/0x1bb0 kernel/events/core.c:12369
__x64_sys_perf_event_open+0xbf/0xd0 kernel/events/core.c:12369
x64_sys_call+0x385/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:299
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f4bfcf9cdd9
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:00007f4bfde9e028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f4bfd215fa0 RCX: 00007f4bfcf9cdd9
RDX: afffffffffffffff RSI: 0000000000000000 RDI: 0000200000000180
RBP: 00007f4bfd032d69 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4bfd216038 R14: 00007f4bfd215fa0 R15: 00007fffb5cdfdb8
</TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3593 Comm: kworker/u4:15 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:453 [inline]
RIP: 0010:smp_call_function_many_cond+0x88d/0x980 kernel/smp.c:998
Code: 41 8b 1f 89 de 83 e6 01 31 ff e8 6e 75 09 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 0a e8 3a 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
RSP: 0018:ffffc90009b27840 EFLAGS: 00000293
RAX: ffffffff81680539 RBX: dffffc0000000000 RCX: ffff888118c3e540
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90009b27978 R08: ffff8881f6e390d7 R09: 1ffff1103edc721a
R10: 0000000000000000 R11: ffffffff8134c110 R12: 1ffff1103edc7218
R13: 1ffff1103ede78a5 R14: 0000000000000001 R15: ffff8881f6f3c528
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe3d6745000 CR3: 000000000700f000 CR4: 00000000003506b0
DR0: 0000200000000300 DR1: 0000200000000300 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+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_enable_cpuslocked+0x126/0x240 kernel/jump_label.c:173
static_key_enable+0x1a/0x30 kernel/jump_label.c:186
toggle_allocation_gate+0xba/0x440 mm/kfence/core.c:821
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>