watchdog: BUG: soft lockup - CPU#1 stuck for 123s! [syz.9.6013:4212] Modules linked in: irq event stamp: 12414371 hardirqs last enabled at (12414370): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 hardirqs last disabled at (12414371): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (115344): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (115344): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (115344): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (115347): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (115347): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (115347): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 4212 Comm: syz.9.6013 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:lock_acquire+0x20b/0x2e0 kernel/locking/lockdep.c:5872 Code: e9 30 ff ff ff e8 45 45 0d 0a f7 c3 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 c1 d2 7a 11 48 3b 44 24 30 75 33 fb 48 83 c4 38 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d fe 7a 73 RSP: 0018:ffffc90000a07db8 EFLAGS: 00000286 RAX: 64d0b81aeec53400 RBX: 0000000000000246 RCX: 0000000000000101 RDX: 000000008eba6367 RSI: ffffffff8e169f12 RDI: ffffffff8c27ca00 RBP: 0000000000000000 R08: ffffffff81767e95 R09: ffffffff8e75e5e0 R10: ffffc90000a07f18 R11: ffffffff81b0c390 R12: 0000000000000002 R13: ffffffff8e75e5e0 R14: 0000000000000000 R15: 0000000000000000 FS: 00007ff9a64856c0(0000) GS:ffff88812555a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff9a6464d58 CR3: 000000007bcf6000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000008d24 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: rcu_lock_acquire include/linux/rcupdate.h:312 [inline] rcu_read_lock include/linux/rcupdate.h:850 [inline] class_rcu_constructor include/linux/rcupdate.h:1193 [inline] unwind_next_frame+0xc2/0x23c0 arch/x86/kernel/unwind_orc.c:495 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 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] __do_kmalloc_node mm/slub.c:5260 [inline] __kmalloc_noprof+0x35c/0x760 mm/slub.c:5272 kmalloc_noprof include/linux/slab.h:954 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] cfg80211_inform_single_bss_data+0x952/0x1b70 net/wireless/scan.c:2344 cfg80211_inform_bss_data+0x266/0x3c40 net/wireless/scan.c:3226 cfg80211_inform_bss_frame_data+0x3c7/0x760 net/wireless/scan.c:3317 ieee80211_bss_info_update+0x794/0xa40 net/mac80211/scan.c:230 ieee80211_scan_rx+0x552/0xa40 net/mac80211/scan.c:364 __ieee80211_rx_handle_packet net/mac80211/rx.c:5305 [inline] ieee80211_rx_list+0x29e5/0x3710 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/0x870 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:finish_task_switch+0x245/0x920 kernel/sched/core.c:5155 Code: 00 00 48 85 db 0f 85 e8 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 49 83 c4 48 4c 89 e7 e8 d5 65 1c 0a e8 30 81 38 00 fb 4c 8b 65 c0 <49> 8d bc 24 80 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0 RSP: 0018:ffffc90004d0fb58 EFLAGS: 00000206 RAX: 0000000000013b9f RBX: 0000000000000000 RCX: 0000000080000001 RDX: 0000000000000000 RSI: ffffffff8def914b RDI: ffffffff8c27ca00 RBP: ffffc90004d0fbb0 R08: ffffffff9011b4b7 R09: 1ffffffff2023696 R10: dffffc0000000000 R11: fffffbfff2023697 R12: ffff88801abfbd00 R13: dffffc0000000000 R14: ffff88803070bd00 R15: ffff8880b873b998 context_switch kernel/sched/core.c:5301 [inline] __schedule+0x15e5/0x52d0 kernel/sched/core.c:6911 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7238 irqentry_exit+0x599/0x620 kernel/entry/common.c:239 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:733 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 f8 af 1e f6 4c 89 e8 fb a8 30 <74> 08 e8 4b 23 01 00 4c 89 e8 a9 00 01 00 00 74 0b 4c 89 f7 e8 99 RSP: 0000:ffffc90004d0fee8 EFLAGS: 00000202 RAX: 0000000000000010 RBX: ffff88801abfbd00 RCX: 0000000000000046 RDX: 0000000000000000 RSI: ffffffff8def914b RDI: ffffffff8c27ca00 RBP: 000000009fffffff R08: ffffffff9011b4b7 R09: 1ffffffff2023696 R10: dffffc0000000000 R11: fffffbfff2023697 R12: 00000000ffffe000 R13: 0000000000000010 R14: ffffc90004d0ff48 R15: ffffc90004d0ff00 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0033:0x7ff9a559c819 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:00007ff9a6485028 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 00007ff9a5816090 RCX: 00007ff9a559c819 RDX: 0000000000000006 RSI: 0000000040042408 RDI: 0000000000000007 RBP: 00007ff9a5632c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff9a5816128 R14: 00007ff9a5816090 R15: 00007fff2eccb7b8 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 18742 Comm: kworker/u8:19 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xce5/0x12c0 kernel/smp.c:877 Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 b4 e6 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 5f e2 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 43 e2 RSP: 0018:ffffc90003647700 EFLAGS: 00000293 RAX: ffffffff81b9bfed RBX: 1ffff110170e813d RCX: ffff88805eed3d00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90003647840 R08: ffffffff9011b4b7 R09: 1ffffffff2023696 R10: dffffc0000000000 R11: fffffbfff2023697 R12: ffff8880b87409e8 R13: dffffc0000000000 R14: ffff8880b863c000 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff88812545a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555794ec4e8 CR3: 000000000e54c000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000200000000300 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:72 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2761 [inline] smp_text_poke_batch_finish+0x5f5/0x1160 arch/x86/kernel/alternative.c:2971 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:900 process_one_work kernel/workqueue.c:3276 [inline] process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245