watchdog: BUG: soft lockup - CPU#0 stuck for 135s! [syz.2.45:6046] Modules linked in: irq event stamp: 5738439 hardirqs last enabled at (5738438): [] asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 hardirqs last disabled at (5738439): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1088 softirqs last enabled at (26658): [] __do_softirq kernel/softirq.c:612 [inline] softirqs last enabled at (26658): [] invoke_softirq kernel/softirq.c:452 [inline] softirqs last enabled at (26658): [] __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661 softirqs last disabled at (26661): [] __do_softirq kernel/softirq.c:612 [inline] softirqs last disabled at (26661): [] invoke_softirq kernel/softirq.c:452 [inline] softirqs last disabled at (26661): [] __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661 CPU: 0 PID: 6046 Comm: syz.2.45 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:in_irqentry_text kernel/stacktrace.c:377 [inline] RIP: 0010:filter_irq_stacks+0x40/0x90 kernel/stacktrace.c:395 Code: f4 31 db 49 bd 00 00 00 00 00 fc ff df 49 89 ff 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 94 98 69 00 49 8b 04 de <48> 3d e0 01 a0 8a 0f 93 c1 48 3d f0 15 a0 8a 0f 92 c2 84 d1 75 27 RSP: 0018:ffffc90000007658 EFLAGS: 00000246 RAX: ffffffff81df401e RBX: 0000000000000000 RCX: 0000000000000001 RDX: 0000000000000820 RSI: 0000000000000021 RDI: ffffc900000076e0 RBP: 0000000000000820 R08: ffffffff8e8b666f R09: 1ffffffff1d16ccd R10: dffffc0000000000 R11: fffffbfff1d16cce R12: 0000000000000021 R13: dffffc0000000000 R14: ffffc900000076e0 R15: ffffc900000076e0 FS: 000055558ca74500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000002f303 CR3: 000000002638d000 CR4: 00000000003506f0 Call Trace: __stack_depot_save+0x1f/0x630 lib/stackdepot.c:377 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_set_track+0x5f/0x70 mm/kasan/common.c:53 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6e/0x4b0 mm/slab.h:767 slab_alloc_node mm/slub.c:3495 [inline] kmem_cache_alloc_node+0x14c/0x320 mm/slub.c:3540 __alloc_skb+0x103/0x2c0 net/core/skbuff.c:643 alloc_skb include/linux/skbuff.h:1316 [inline] ndisc_alloc_skb+0xa6/0x450 net/ipv6/ndisc.c:423 ndisc_send_rs+0x2a6/0x610 net/ipv6/ndisc.c:707 addrconf_rs_timer+0x2d5/0x630 net/ipv6/addrconf.c:4024 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701 expire_timers kernel/time/timer.c:1752 [inline] __run_timers+0x542/0x800 kernel/time/timer.c:2023 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036 handle_softirqs+0x280/0x820 kernel/softirq.c:578 __do_softirq kernel/softirq.c:612 [inline] invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:check_preemption_disabled+0x3/0x110 lib/smp_processor_id.c:13 Code: ff ff ff cc cc cc cc f3 0f 1e fa 48 c7 c7 c0 9b 1c 8b 48 c7 c6 00 9c 1c 8b eb 0c 66 2e 0f 1f 84 00 00 00 00 00 66 90 55 41 57 <41> 56 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 65 RSP: 0018:ffffc90003567890 EFLAGS: 00000282 RAX: ffffffff819484ab RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff88807d8a8000 RSI: ffffffff8b1c9c00 RDI: ffffffff8b1c9bc0 RBP: 0000000000000001 R08: dffffc0000000000 R09: 1ffffffff2239aa0 R10: dffffc0000000000 R11: fffffbfff2239aa1 R12: 0000000000000004 R13: dffffc0000000000 R14: 00007f7f9ef9ce59 R15: 0000000000000000 rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline] rcu_is_watching+0x15/0xb0 kernel/rcu/tree.c:700 rcu_read_unlock include/linux/rcupdate.h:815 [inline] is_bpf_text_address+0x204/0x2a0 kernel/bpf/core.c:743 kernel_text_address+0xa0/0xd0 kernel/extable.c:125 __kernel_text_address+0xd/0x30 kernel/extable.c:79 unwind_get_return_address+0x5d/0xc0 arch/x86/kernel/unwind_orc.c:369 arch_stack_walk+0x11d/0x190 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:46 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492 task_work_add+0xd9/0x470 kernel/task_work.c:82 fput+0xdd/0x1a0 fs/file_table.c:440 filp_close+0x10f/0x150 fs/open.c:1547 __range_close fs/file.c:698 [inline] __close_range+0x368/0x660 fs/file.c:755 __do_sys_close_range fs/open.c:1599 [inline] __se_sys_close_range fs/open.c:1596 [inline] __x64_sys_close_range+0x7a/0x90 fs/open.c:1596 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f7f9ef9ce59 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:00007ffe1b74f1e8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: ffffffffffffffda RBX: 00007ffe1b74f2d0 RCX: 00007f7f9ef9ce59 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 000000000002f303 R08: 0000000000000001 R09: 0000000000000000 R10: 0000001b2d920000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7f9f215fac R14: 00007f7f9f215fa8 R15: 00007f7f9f215fa0 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 3471 Comm: kworker/u4:12 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:311 [inline] RIP: 0010:smp_call_function_many_cond+0xdfe/0x1140 kernel/smp.c:855 Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 4b f7 0a 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 86 f3 0a 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 6a f3 RSP: 0018:ffffc9000c907780 EFLAGS: 00000293 RAX: ffffffff817c3826 RBX: 1ffff110171c8769 RCX: ffff88802e558000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000c907900 R08: ffffffff911cd507 R09: 1ffffffff2239aa0 R10: dffffc0000000000 R11: fffffbfff2239aa1 R12: ffff8880b8e43b48 R13: dffffc0000000000 R14: ffff8880b8f3d1c8 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd3b0b9c5c CR3: 000000000cf32000 CR4: 00000000003506e0 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1022 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:2222 [inline] text_poke_bp_batch+0x31e/0x990 arch/x86/kernel/alternative.c:2432 text_poke_flush arch/x86/kernel/alternative.c:2623 [inline] text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2630 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x123/0x240 kernel/jump_label.c:207 static_key_enable+0x1a/0x20 kernel/jump_label.c:220 toggle_allocation_gate+0xa8/0x260 mm/kfence/core.c:847 process_one_work kernel/workqueue.c:2653 [inline] process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293