watchdog: BUG: soft lockup - CPU#1 stuck for 143s! [syz.3.11290:9730] Modules linked in: irq event stamp: 13860785 hardirqs last enabled at (13860784): [] irqentry_exit+0x59c/0x620 kernel/entry/common.c:219 hardirqs last disabled at (13860785): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (5401122): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (5401122): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (5401122): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (5401125): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (5401125): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (5401125): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 9730 Comm: syz.3.11290 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:kcov_remote_start+0x2d/0x7a0 kernel/kcov.c:935 Code: fa 55 41 57 41 56 41 55 41 54 53 48 83 ec 10 65 4c 8b 35 8e 2f 2e 11 48 b8 00 00 00 00 ff ff ff 00 48 85 c7 74 18 90 0f 0b 90 <48> 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d e9 c0 52 d5 09 cc 48 89 RSP: 0018:ffffc90000a08b18 EFLAGS: 00000206 RAX: 0000000000000002 RBX: 0000000000000246 RCX: 0000000000000101 RDX: 0000000000000000 RSI: ffffffff8dcc9112 RDI: ffffffff8c073980 RBP: ffffc90000a08db0 R08: ffffffff8fef1a77 R09: 1ffffffff1fde34e R10: dffffc0000000000 R11: fffffbfff1fde34f R12: fffffffffffffff0 R13: ffffffff81c480e8 R14: ffff88802ad18000 R15: 0000000000000000 FS: 00007f56908fd6c0(0000) GS:ffff8881257f5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b33715ff8 CR3: 000000003c886000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: kcov_remote_start_common include/linux/kcov.h:50 [inline] ieee80211_rx_list+0x76b/0x3050 net/mac80211/rx.c:5526 ieee80211_rx_napi+0x1b1/0x3e0 net/mac80211/rx.c:5567 ieee80211_rx include/net/mac80211.h:5216 [inline] ieee80211_handle_queued_frames+0xe8/0x1e0 net/mac80211/main.c:452 tasklet_action_common+0x2da/0x4b0 kernel/softirq.c:925 handle_softirqs+0x22a/0x7c0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/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_schedule_irq+0x48/0xa0 kernel/sched/core.c:7194 Code: 49 be 00 00 00 00 00 fc ff df eb 09 48 f7 03 10 00 00 00 74 53 bf 01 00 00 00 e8 b3 9c fa f5 e8 ae 30 34 f6 fb bf 01 00 00 00 43 a9 ff ff 9c 58 fa a9 00 02 00 00 74 05 e8 34 32 34 f6 bf 01 RSP: 0018:ffffc9000392fca0 EFLAGS: 00000206 RAX: 0000000000000895 RBX: 0000000000000000 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8dcc9112 RDI: 0000000000000001 RBP: 0000000000000000 R08: ffffffff8fef1a77 R09: 1ffffffff1fde34e R10: dffffc0000000000 R11: fffffbfff1fde34f R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 irqentry_exit+0x597/0x620 kernel/entry/common.c:216 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:do_futex+0x3f9/0x420 kernel/futex/syscalls.c:159 Code: 36 e0 45 49 c7 04 1e 00 00 00 00 65 48 8b 0d ee 11 3b 11 48 3b 8c 24 80 00 00 00 75 22 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f <5d> e9 11 35 e2 09 cc e8 fb d8 0c 00 48 c7 c0 da ff ff ff eb b1 e8 RSP: 0018:ffffc9000392fdc8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0982ac612d639600 RDX: ffffc900151b6000 RSI: 0000000000003e94 RDI: 0000000000003e95 RBP: ffffc9000392fdc8 R08: ffffffff81b75712 R09: ffffffff8e55a360 R10: dffffc0000000000 R11: fffffbfff1fde34f R12: 0000000000000000 R13: ffffc9000392fe60 R14: 0000000000000000 R15: 1ffff92000725fc4 __do_sys_futex kernel/futex/syscalls.c:207 [inline] __se_sys_futex+0x3a8/0x450 kernel/futex/syscalls.c:188 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f568f99aeb9 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:00007f56908fd0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007f568fc16098 RCX: 00007f568f99aeb9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f568fc16098 RBP: 00007f568fc16090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f568fc16128 R14: 00007ffcfa461b30 R15: 00007ffcfa461c18 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 19676 Comm: kworker/u8:9 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+0xcea/0x1270 kernel/smp.c:877 Code: 89 ee 83 e6 01 31 ff e8 c4 db 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 6f d7 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 53 d7 0b 00 eb e4 44 RSP: 0018:ffffc90002ef76a0 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 1ffff110170e8129 RCX: ffff88802e8dbd00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90002ef77e0 R08: ffffffff8fef1a77 R09: 1ffffffff1fde34e R10: dffffc0000000000 R11: fffffbfff1fde34f R12: ffff8880b8740948 R13: dffffc0000000000 R14: ffff8880b863bb00 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8881256f5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055555bda94e8 CR3: 000000000e346000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000200000000300 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+0x5f5/0x1160 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+0x1fe/0x290 mm/kfence/core.c:886 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3340 worker_thread+0xda6/0x1360 kernel/workqueue.c:3421 kthread+0x726/0x8b0 kernel/kthread.c:463 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246