RBP: 00007ff25e5caf6d R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff25e7b9128 R14: 00007ff25e7b9090 R15: 00007ffe893504b8
watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [syz.1.6140:25587]
Modules linked in:
CPU: 0 PID: 25587 Comm: syz.1.6140 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
RIP: 0010:__siphash_unaligned+0x51/0x330 lib/siphash.c:85
Code: 66 09 ff 49 8d 7d 08 48 89 f8 48 c1 e8 03 42 80 3c 30 00 74 05 e8 0f f4 43 ff 48 89 5d c8 48 83 e3 f8 48 89 5d c0 4d 8b 75 08 <48> bb 73 65 74 79 62 64 65 74 4c 89 e8 48 c1 e8 03 48 b9 00 00 00
RSP: 0018:ffffc900000071f8 EFLAGS: 00000206
RAX: 1ffffffff0d87a4b RBX: 0000000000000048 RCX: ffff88814a875000
RDX: 0000000000000502 RSI: 0000000000000048 RDI: ffffffff86c3d258
RBP: ffffc90000007248 R08: 0000000000000000 R09: 0000000000000003
R10: 0000000000000008 R11: 0000000000000502 R12: 1ffff92000000e64
R13: ffffffff86c3d250 R14: 4a6e31103630aaa4 R15: ffffffff86c3d250
FS:  00007ff25cf696c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000004c0000 CR3: 0000000112c05000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 00000000000f0602
Call Trace:
 <IRQ>
 siphash include/linux/siphash.h:85 [inline]
 __flow_hash_from_keys net/core/flow_dissector.c:1539 [inline]
 ___skb_get_hash+0x3e3/0x680 net/core/flow_dissector.c:1561
 __skb_get_hash+0xd2/0x270 net/core/flow_dissector.c:1623
 skb_get_hash include/linux/skbuff.h:1396 [inline]
 skb_tx_hash net/core/dev.c:3203 [inline]
 netdev_pick_tx+0x36a/0xf00 net/core/dev.c:4061
 netdev_core_pick_tx+0x153/0x320 net/core/dev.c:4094
 __dev_queue_xmit+0x958/0x2500 net/core/dev.c:4169
 dev_queue_xmit+0x17/0x20 net/core/dev.c:4255
 neigh_resolve_output+0x6c4/0x770 net/core/neighbour.c:1505
 neigh_output include/net/neighbour.h:517 [inline]
 ip6_finish_output2+0xee2/0x1540 net/ipv6/ip6_output.c:132
 __ip6_finish_output+0x5fd/0x790 net/ipv6/ip6_output.c:203
 ip6_finish_output+0x33/0x1e0 net/ipv6/ip6_output.c:213
 NF_HOOK_COND include/linux/netfilter.h:288 [inline]
 ip6_output+0x1fa/0x420 net/ipv6/ip6_output.c:236
 dst_output include/net/dst.h:451 [inline]
 NF_HOOK include/linux/netfilter.h:299 [inline]
 ndisc_send_skb+0x721/0xbc0 net/ipv6/ndisc.c:513
 ndisc_send_rs+0x711/0x960 net/ipv6/ndisc.c:707
 addrconf_rs_timer+0x35a/0x600 net/ipv6/addrconf.c:3982
 call_timer_fn+0x38/0x290 kernel/time/timer.c:1450
 expire_timers kernel/time/timer.c:1495 [inline]
 __run_timers+0x637/0x9a0 kernel/time/timer.c:1789
 run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1802
 __do_softirq+0x255/0x563 kernel/softirq.c:309
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0x60/0x80 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:405 [inline]
 __irq_exit_rcu+0x128/0x150 kernel/softirq.c:435
 irq_exit_rcu+0x9/0x10 kernel/softirq.c:447
 sysvec_apic_timer_interrupt+0xbf/0xe0 arch/x86/kernel/apic/apic.c:1106
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x49/0x70 kernel/locking/spinlock.c:199
Code: 12 48 89 fb 48 c7 c7 70 73 4c 86 e8 91 3a 1c fd 48 89 df 48 83 3d 56 69 c9 01 00 74 27 e8 83 ce c8 fc 66 90 fb bf 01 00 00 00 <e8> 52 c7 c1 fc 65 8b 05 57 63 7f 7b 85 c0 74 03 5b 5d c3 e8 43 63
RSP: 0018:ffffc900011779d0 EFLAGS: 00000246
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: dffffc0000000000
RDX: 0000000040000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffffc900011779d8 R08: ffffffff86c38b93 R09: 1ffffffff0d87172
R10: dffffc0000000000 R11: fffffbfff0d87173 R12: ffff8881f7056000
R13: ffff88812414502c R14: 0000000000000000 R15: ffff88814a875000
 finish_lock_switch kernel/sched/core.c:3786 [inline]
 finish_task_switch+0x12e/0x5a0 kernel/sched/core.c:3886
 context_switch kernel/sched/core.c:4051 [inline]
 __schedule+0xc0b/0x13e0 kernel/sched/core.c:4806
 preempt_schedule_irq+0xaa/0x120 kernel/sched/core.c:5067
 irqentry_exit_cond_resched kernel/entry/common.c:368 [inline]
 irqentry_exit+0x56/0x60 kernel/entry/common.c:398
 sysvec_apic_timer_interrupt+0xcb/0xe0 arch/x86/kernel/apic/apic.c:1106
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635
RIP: 0010:kasan_check_range+0x0/0x2a0 mm/kasan/generic.c:188
Code: 48 c1 ee 03 48 01 c6 48 89 c7 e8 9b d6 de 02 31 c0 5d c3 0f 0b b8 ea ff ff ff c3 0f 0b b8 ea ff ff ff c3 00 00 cc cc 00 00 cc <b0> 01 48 85 f6 0f 84 c0 01 00 00 55 48 89 e5 41 57 41 56 41 55 41
RSP: 0018:ffffc90001177cc8 EFLAGS: 00000a06
RAX: f3f3f3f8f1f1f1f1 RBX: ffff88814a8759f0 RCX: ffffffff84823ae5
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88814a8759f0
RBP: ffffc90001177cd0 R08: ffff88814a875023 R09: 1ffff1102950ea04
R10: dffffc0000000000 R11: ffffed102950ea05 R12: dffffc0000000000
R13: ffff88814a875000 R14: ffffc90001177d00 R15: 1ffff9200022ef9c
 instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
 atomic64_try_cmpxchg_acquire include/asm-generic/atomic-instrumented.h:1515 [inline]
 atomic_long_try_cmpxchg_acquire include/asm-generic/atomic-long.h:443 [inline]
 __mutex_trylock_fast kernel/locking/mutex.c:173 [inline]
 mutex_lock+0x85/0xf0 kernel/locking/mutex.c:298
 __do_sys_perf_event_open kernel/events/core.c:12298 [inline]
 __se_sys_perf_event_open+0x183b/0x1b40 kernel/events/core.c:11878
 __x64_sys_perf_event_open+0xbf/0xd0 kernel/events/core.c:11878
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7ff25e53bf19
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:00007ff25cf69028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007ff25e7b9090 RCX: 00007ff25e53bf19
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 00002000000018c0
RBP: 00007ff25e5caf6d R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff25e7b9128 R14: 00007ff25e7b9090 R15: 00007ffe893504b8
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 49 Comm: kworker/u4:2 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:229 [inline]
RIP: 0010:smp_call_function_single+0x211/0x490 kernel/smp.c:517
Code: ff e8 63 90 0a 00 41 83 e6 01 49 bc 00 00 00 00 00 fc ff df 75 0a e8 9e 8c 0a 00 e9 a4 00 00 00 f3 90 f7 44 24 48 01 00 00 00 <0f> 84 8f 00 00 00 e8 84 8c 0a 00 eb e9 e8 3d b3 23 03 89 c3 41 89
RSP: 0018:ffffc900009e7700 EFLAGS: 00000202
RAX: ffffffff815a2a3c RBX: 0000000000000000 RCX: ffff888101ff1400
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900009e77f0 R08: ffffffff86c383ef R09: 1ffffffff0d8707d
R10: dffffc0000000000 R11: fffffbfff0d8707e R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff9200013cee4
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3a2205b000 CR3: 000000000640f000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 smp_call_function_many_cond+0x8f5/0x9d0 kernel/smp.c:653
 smp_call_function_many kernel/smp.c:716 [inline]
 smp_call_function kernel/smp.c:738 [inline]
 on_each_cpu+0xab/0x180 kernel/smp.c:837
 text_poke_sync arch/x86/kernel/alternative.c:1568 [inline]
 text_poke_bp_batch+0x1cb/0x5f0 arch/x86/kernel/alternative.c:1768
 text_poke_flush arch/x86/kernel/alternative.c:1959 [inline]
 text_poke_finish+0x1a/0x30 arch/x86/kernel/alternative.c:1966
 arch_jump_label_transform_apply+0x15/0x30 arch/x86/kernel/jump_label.c:126
 __jump_label_update+0x38f/0x3b0 kernel/jump_label.c:459
 jump_label_update+0x34c/0x3e0 kernel/jump_label.c:825
 static_key_disable_cpuslocked+0xc5/0x1a0 kernel/jump_label.c:207
 static_key_disable+0x1a/0x30 kernel/jump_label.c:215
 toggle_allocation_gate+0x3a5/0x440 mm/kfence/core.c:638
 process_one_work+0x6fd/0xbc0 kernel/workqueue.c:2301
 worker_thread+0xa8e/0x13c0 kernel/workqueue.c:2447
 kthread+0x324/0x3b0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298