watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.9.14158:27940] Modules linked in: irq event stamp: 10702443 hardirqs last enabled at (10702442): [] irqentry_exit+0x5e8/0x670 kernel/entry/common.c:219 hardirqs last disabled at (10702443): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (10035662): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (10035662): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (10035662): [] __irq_exit_rcu+0x60/0x150 kernel/softirq.c:723 softirqs last disabled at (10035665): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (10035665): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (10035665): [] __irq_exit_rcu+0x60/0x150 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 27940 Comm: syz.9.14158 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:98 [inline] RIP: 0010:memory_is_nonzero mm/kasan/generic.c:115 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:140 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:172 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:191 [inline] RIP: 0010:kasan_check_range+0x9b/0x2c0 mm/kasan/generic.c:200 Code: 01 00 00 00 00 fc ff df 4d 8d 34 19 4d 89 f4 4d 29 dc 49 83 fc 10 7f 29 4d 85 e4 0f 84 41 01 00 00 4c 89 cb 48 f7 d3 4c 01 fb <41> 80 3b 00 0f 85 de 01 00 00 49 ff c3 48 ff c3 75 ee e9 21 01 00 RSP: 0018:ffffc90000007228 EFLAGS: 00000282 RAX: 0000000000000001 RBX: fffffffffffffffe RCX: ffffffff81cab8af RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffe8fffea27024 RBP: 0000000000000000 R08: ffffe8fffea2702b R09: 1ffffd1fffd44e05 R10: dffffc0000000000 R11: fffff91fffd44e04 R12: 0000000000000002 R13: dffffc0000000000 R14: fffff91fffd44e06 R15: 1ffffd1fffd44e04 FS: 00007ffb1c6e96c0(0000) GS:ffff888125e1f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31018ff8 CR3: 000000007e2ee000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0100000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __asan_memset+0x22/0x50 mm/kasan/shadow.c:84 perf_trace_buf_alloc+0x1bf/0x280 kernel/trace/trace_event_perf.c:419 do_perf_trace_lock_acquire include/trace/events/lock.h:24 [inline] perf_trace_lock_acquire+0x196/0x410 include/trace/events/lock.h:24 __do_trace_lock_acquire include/trace/events/lock.h:24 [inline] trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0x2ef/0x340 kernel/locking/lockdep.c:5831 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:867 [inline] class_rcu_constructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0xc2/0x23d0 arch/x86/kernel/unwind_orc.c:495 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x3e2/0x700 mm/slub.c:5776 kmalloc_noprof include/linux/slab.h:957 [inline] dst_cow_metrics_generic+0x56/0x1c0 net/core/dst.c:193 dst_metrics_write_ptr include/net/dst.h:136 [inline] dst_metric_set include/net/dst.h:197 [inline] icmp6_dst_alloc+0x264/0x420 net/ipv6/route.c:3346 ndisc_send_skb+0x3f1/0x1510 net/ipv6/ndisc.c:491 addrconf_rs_timer+0x369/0x6a0 net/ipv6/addrconf.c:4037 call_timer_fn+0x16e/0x590 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x61a/0x860 kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2404 handle_softirqs+0x22b/0x7c0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x60/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:__preempt_count_sub arch/x86/include/asm/preempt.h:85 [inline] RIP: 0010:preempt_schedule_common+0x8a/0xd0 kernel/sched/core.c:7049 Code: 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 5a 2d cc f6 49 89 1e bf 01 00 00 00 e8 0d ab ff ff 65 8b 05 e6 20 25 07 <65> ff 0d df 20 25 07 65 48 8b 1c 25 08 10 80 92 48 89 d8 48 c1 e8 RSP: 0018:ffffc900038cf900 EFLAGS: 00000246 RAX: 0000000000000001 RBX: ffffffff81337786 RCX: 0000000000000002 RDX: 0000000000000000 RSI: ffffffff8bc086c0 RDI: ffffffff8bc08680 RBP: ffffc900038cf968 R08: ffffffff8f822477 R09: 1ffffffff1f0448e R10: dffffc0000000000 R11: fffffbfff1f0448f R12: dffffc0000000000 R13: ffffc900038cfaa0 R14: ffff88802f11f0a0 R15: dffffc0000000000 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:186 spin_unlock include/linux/spinlock.h:391 [inline] futex_queue kernel/futex/futex.h:316 [inline] futex_wait_setup+0x43d/0x590 kernel/futex/waitwake.c:660 __futex_wait+0x148/0x3d0 kernel/futex/waitwake.c:682 futex_wait+0x104/0x360 kernel/futex/waitwake.c:715 do_futex+0x333/0x420 kernel/futex/syscalls.c:130 __do_sys_futex kernel/futex/syscalls.c:207 [inline] __se_sys_futex+0x36f/0x400 kernel/futex/syscalls.c:188 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ffb1b78f749 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:00007ffb1c6e90e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007ffb1b9e5fa8 RCX: 00007ffb1b78f749 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007ffb1b9e5fa8 RBP: 00007ffb1b9e5fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffb1b9e6038 R14: 00007ffc080fd730 R15: 00007ffc080fd818 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 4783 Comm: kworker/u8:7 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xcc5/0x1260 kernel/smp.c:877 Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 d4 97 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 7f 93 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 63 93 RSP: 0018:ffffc900033876a0 EFLAGS: 00000293 RAX: ffffffff81b5654d RBX: 1ffff110170c856d RCX: ffff88807b51bd00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc900033877e0 R08: ffffffff8f822477 R09: 1ffffffff1f0448e R10: dffffc0000000000 R11: fffffbfff1f0448f R12: ffff8880b8642b68 R13: dffffc0000000000 R14: ffff8880b873bb00 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125f1f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa400e29ff8 CR3: 000000000dd3a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043 on_each_cpu include/linux/smp.h:71 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2711 [inline] smp_text_poke_batch_finish+0x5f9/0x1130 arch/x86/kernel/alternative.c:2921 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_disable_cpuslocked+0xc5/0x1a0 kernel/jump_label.c:240 static_key_disable+0x1a/0x20 kernel/jump_label.c:248 toggle_allocation_gate+0x1a1/0x240 mm/kfence/core.c:879 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246