watchdog: BUG: soft lockup - CPU#0 stuck for 144s! [syz.3.12:5964] Modules linked in: irq event stamp: 10890027 hardirqs last enabled at (10890026): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:357 hardirqs last disabled at (10890027): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1049 softirqs last enabled at (9384384): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (9384384): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (9384384): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (9384387): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (9384387): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (9384387): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 0 UID: 0 PID: 5964 Comm: syz.3.12 Not tainted 6.15.0-rc4-syzkaller-g9325d53fe9ad #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:__read_once_word_nocheck+0x3/0x10 include/asm-generic/rwonce.h:67 Code: b0 00 48 ba 00 00 00 00 00 fc ff df e9 88 fc ff ff 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 8b 07 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc900000074d0 EFLAGS: 00000202 RAX: ffffffff8b55b4b6 RBX: ffffc900052d7ef8 RCX: 1ffff92000000e01 RDX: ffffffff90125dc0 RSI: 0000000000000002 RDI: ffffc900052d7ef8 RBP: 1ffff92000000eb6 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff817199f5 R12: ffffc900052d8000 R13: 1ffff92000000eb7 R14: ffffc900000075a8 R15: ffffc900052d0000 FS: 00007f43247b46c0(0000) GS:ffff8881260ca000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f43247b3f98 CR3: 0000000028b6a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: deref_stack_reg arch/x86/kernel/unwind_orc.c:406 [inline] unwind_next_frame+0xc3c/0x2390 arch/x86/kernel/unwind_orc.c:585 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:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4161 [inline] slab_alloc_node mm/slub.c:4210 [inline] kmem_cache_alloc_node_noprof+0x1bb/0x3c0 mm/slub.c:4262 kmalloc_reserve+0xbd/0x290 net/core/skbuff.c:577 __alloc_skb+0x142/0x2d0 net/core/skbuff.c:668 alloc_skb include/linux/skbuff.h:1340 [inline] ndisc_alloc_skb+0x9f/0x480 net/ipv6/ndisc.c:423 ndisc_send_rs+0x2b5/0x630 net/ipv6/ndisc.c:707 addrconf_rs_timer+0x369/0x670 net/ipv6/addrconf.c:4038 call_timer_fn+0x17b/0x5f0 kernel/time/timer.c:1789 expire_timers kernel/time/timer.c:1840 [inline] __run_timers kernel/time/timer.c:2414 [inline] __run_timer_base+0x61a/0x860 kernel/time/timer.c:2426 run_timer_base kernel/time/timer.c:2435 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2445 handle_softirqs+0x283/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline] sysvec_irq_work+0xa3/0xc0 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:738 RIP: 0010:kvm_kick_cpu+0x77/0xb0 arch/x86/kernel/kvm.c:1041 Code: df da b0 00 48 c7 c3 b0 61 75 92 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 84 c0 75 2c 8b 0b b8 05 00 00 00 31 db 0f 01 c1 <5b> 41 5e 41 5f c3 cc cc cc cc cc e8 19 c1 4e 00 89 de 48 c7 c7 00 RSP: 0018:ffffc900052d7b00 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 RDX: ffffc900111e6000 RSI: 00000000000011a2 RDI: 00000000000011a3 RBP: 0000000000000000 R08: ffffc90000a61e0b R09: 1ffff9200014c3c1 R10: dffffc0000000000 R11: fffff5200014c3c2 R12: 1ffff11047ffc348 R13: dffffc0000000000 R14: ffffffff8d96dc18 R15: dffffc0000000000 pv_kick kernel/locking/qspinlock_paravirt.h:539 [inline] __pv_queued_spin_unlock_slowpath+0x198/0x2a0 kernel/locking/qspinlock_paravirt.h:539 __raw_callee_save___pv_queued_spin_unlock_slowpath+0x15/0x30 .slowpath+0x9/0x18 pv_queued_spin_unlock arch/x86/include/asm/paravirt.h:577 [inline] queued_spin_unlock arch/x86/include/asm/qspinlock.h:57 [inline] do_raw_spin_unlock+0x122/0x240 kernel/locking/spinlock_debug.c:142 __raw_spin_unlock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_unlock+0x1e/0x50 kernel/locking/spinlock.c:186 spin_unlock include/linux/spinlock.h:391 [inline] futex_wake+0x44b/0x500 kernel/futex/waitwake.c:198 do_futex+0x395/0x420 kernel/futex/syscalls.c:107 __do_sys_futex kernel/futex/syscalls.c:179 [inline] __se_sys_futex+0x36f/0x400 kernel/futex/syscalls.c:160 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f432398e969 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:00007f43247b40e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007f4323bb6248 RCX: 00007f432398e969 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f4323bb624c RBP: 00007f4323bb6240 R08: 7fffffffffffffff R09: 0000000000000000 R10: 0000000000000006 R11: 0000000000000246 R12: 00007f4323bb624c R13: 0000000000000000 R14: 00007fff0f8a3750 R15: 00007fff0f8a3838 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 36 Comm: kworker/u8:2 Not tainted 6.15.0-rc4-syzkaller-g9325d53fe9ad #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline] RIP: 0010:smp_call_function_many_cond+0xe69/0x11c0 kernel/smp.c:885 Code: 00 45 8b 2f 44 89 ee 83 e6 01 31 ff e8 20 6d 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 cb 68 0b 00 eb 37 f3 90 <43> 0f b6 04 2c 84 c0 75 10 41 f7 07 01 00 00 00 74 1e e8 b0 68 0b RSP: 0018:ffffc90000ad7700 EFLAGS: 00000293 RAX: ffffffff81b45620 RBX: ffff8880b893ad40 RCX: ffff8881442a9e00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90000ad7860 R08: ffffffff8f7ed277 R09: 1ffffffff1efda4e R10: dffffc0000000000 R11: fffffbfff1efda4f R12: 1ffff11017108245 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880b8841228 FS: 0000000000000000(0000) GS:ffff8881261ca000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30217ff8 CR3: 000000000dd36000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:2455 [inline] text_poke_bp_batch+0x319/0x940 arch/x86/kernel/alternative.c:2665 text_poke_flush arch/x86/kernel/alternative.c:2856 [inline] text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2863 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_disable_cpuslocked+0xc5/0x1b0 kernel/jump_label.c:240 static_key_disable+0x1a/0x20 kernel/jump_label.c:248 toggle_allocation_gate+0x1a1/0x240 mm/kfence/core.c:855 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245