watchdog: BUG: soft lockup - CPU#0 stuck for 122s! [syz.8.2546:19324] Modules linked in: irq event stamp: 11978573 hardirqs last enabled at (11978572): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 hardirqs last disabled at (11978573): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (1485590): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (1485590): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (1485590): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (1485593): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (1485593): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (1485593): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 19324 Comm: syz.8.2546 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:__sanitizer_cov_trace_switch+0x7/0x130 kernel/kcov.c:331 Code: 20 c3 cc cc cc cc cc 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 06 <48> 8b 4e 08 48 83 c1 f8 48 c1 c1 3d 48 83 f9 02 7f 1e 48 85 c9 74 RSP: 0018:ffffc900000078e8 EFLAGS: 00000212 RAX: 0000000000000002 RBX: ffff88802f38e0d0 RCX: 0000000000000100 RDX: ffff888058861e40 RSI: ffffffff8fe81e60 RDI: 0000000000000000 RBP: 0000000000000001 R08: 0000000000000000 R09: 000000000000000c R10: 000000000000000c R11: 0000000000000100 R12: 0000000000000000 R13: 1ffff1100b7573ab R14: 0000000000000080 R15: 000000000000004c FS: 00007fdd17ca06c0(0000) GS:ffff888125496000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7917d69070 CR3: 000000002fa66000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000200000000300 DR3: 0000000000000000 DR6: 00000000ffff0ff1 DR7: 0000000000000600 Call Trace: ieee80211_get_bssid+0x107/0x200 net/mac80211/util.c:79 ieee80211_accept_frame net/mac80211/rx.c:4483 [inline] ieee80211_prepare_and_rx_handle+0x313/0x67f0 net/mac80211/rx.c:5105 __ieee80211_rx_handle_packet net/mac80211/rx.c:5423 [inline] ieee80211_rx_list+0x2b53/0x3710 net/mac80211/rx.c:5588 ieee80211_rx_napi+0x1b1/0x3e0 net/mac80211/rx.c:5611 ieee80211_rx include/net/mac80211.h:5267 [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:__schedule+0x1584/0x52b0 kernel/sched/core.c:6864 Code: d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 f2 79 8c f6 4c 89 2b 4c 89 e7 4c 89 ee e8 f4 9f 91 f5 48 89 c7 e8 cc a3 f2 f5 <31> ff 4d 39 ec 40 0f 95 c7 e8 ee ac f2 f5 48 8b 84 24 d8 00 00 00 RSP: 0018:ffffc90003acfbc0 EFLAGS: 00000206 RAX: 000000000011a7c3 RBX: ffff8880b863abc8 RCX: 0000000080000001 RDX: 0000000000000000 RSI: ffffffff8deec7f5 RDI: ffffffff8c278880 RBP: ffffc90003acfdb0 R08: ffffffff90111eb7 R09: 1ffffffff20223d6 R10: dffffc0000000000 R11: fffffbfff20223d7 R12: ffff888058861e40 R13: ffff888058861e40 R14: dffffc0000000000 R15: 1ffff110170c7573 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7234 irqentry_exit+0x599/0x620 kernel/entry/common.c:239 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:__exit_to_user_mode_loop kernel/entry/common.c:52 [inline] RIP: 0010:exit_to_user_mode_loop kernel/entry/common.c:98 [inline] RIP: 0010:__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] RIP: 0010:irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline] RIP: 0010:irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline] RIP: 0010:irqentry_exit+0x14e/0x620 kernel/entry/common.c:219 Code: 00 00 c0 4c 8d a0 00 e0 ff 3f bd ff ff ff 9f 4c 8d 7c 24 18 f7 c7 37 03 00 00 74 64 49 89 fd e8 98 c6 2b f6 4c 89 e8 fb a8 30 <74> 08 e8 3b 23 01 00 4c 89 e8 a9 00 01 00 00 74 0b 4c 89 f7 e8 f9 RSP: 0000:ffffc90003acfee8 EFLAGS: 00000202 RAX: 0000000000000010 RBX: ffff888058861e40 RCX: 0000000000000046 RDX: 0000000000000000 RSI: ffffffff8deec7f5 RDI: ffffffff8c278880 RBP: 000000009fffffff R08: ffffffff90111eb7 R09: 1ffffffff20223d6 R10: dffffc0000000000 R11: fffffbfff20223d7 R12: 00000000ffffe000 R13: 0000000000000010 R14: ffffc90003acff48 R15: ffffc90003acff00 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0033:0x7fdd16d9c631 Code: 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 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f RSP: 002b:00007fdd17ca00e8 EFLAGS: 00000217 RAX: 0000000000000000 RBX: 00007fdd17015fa8 RCX: 00007fdd16d9c629 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fdd17015fa8 RBP: 00007fdd17015fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fdd17016038 R14: 00007fff9d2b4bd0 R15: 00007fff9d2b4cb8 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 7334 Comm: kworker/u8:62 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:__sanitizer_cov_trace_pc+0x5c/0x70 kernel/kcov.c:235 Code: 30 16 00 00 83 fa 02 75 21 48 8b 91 38 16 00 00 48 8b 32 48 8d 7e 01 8b 89 34 16 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 08 cc cc cc cc cc 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 RSP: 0018:ffffc9000d33f718 EFLAGS: 00000293 RAX: ffffffff81b8dd6d RBX: 1ffff110170c84d5 RCX: ffff888024e83c80 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000d33f860 R08: ffffffff90111eb7 R09: 1ffffffff20223d6 R10: dffffc0000000000 R11: fffffbfff20223d7 R12: ffff8880b86426a8 R13: dffffc0000000000 R14: ffff8880b873bd80 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125596000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055b106dc41b8 CR3: 000000000e54c000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000200000000300 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: csd_lock_wait kernel/smp.c:342 [inline] smp_call_function_many_cond+0xcfd/0x1270 kernel/smp.c:877 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043 on_each_cpu include/linux/smp.h:72 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2746 [inline] smp_text_poke_batch_finish+0x5f5/0x1160 arch/x86/kernel/alternative.c:2956 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x128/0x240 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 toggle_allocation_gate+0xab/0x290 mm/kfence/core.c:899 process_one_work kernel/workqueue.c:3275 [inline] process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3358 worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439 kthread+0x388/0x470 kernel/kthread.c:467 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245