watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.2.12329:18821] Modules linked in: irq event stamp: 6483771 hardirqs last enabled at (6483770): [] irqentry_exit+0x5dd/0x660 kernel/entry/common.c:219 hardirqs last disabled at (6483771): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (4686452): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (4686452): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (4686452): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 softirqs last disabled at (4686455): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (4686455): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (4686455): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 18821 Comm: syz.2.12329 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:filter_irq_stacks+0x0/0xa0 kernel/stacktrace.c:393 Code: 38 c1 0f 8c 72 ff ff ff 4c 89 f7 e8 1a e3 79 00 e9 65 ff ff ff e8 20 ea 9b 09 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 41 57 41 56 41 55 41 54 53 85 f6 74 70 49 89 fe 41 89 RSP: 0018:ffffc90000006e60 EFLAGS: 00000293 RAX: 84437c22aee08e00 RBX: 0000000000000901 RCX: 0000000000000001 RDX: 0000000000000920 RSI: 0000000000000027 RDI: ffffc90000006ed0 RBP: ffffc90000007100 R08: ffffffff81d05746 R09: ffffffff8df41cc0 R10: ffffc90000006480 R11: fffff52000000c93 R12: ffff88801a026280 R13: 0000000000000920 R14: ffffc90000006ed0 R15: ffffc90000006ed0 FS: 00007fdff52556c0(0000) GS:ffff8881260b0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffcd760dfc0 CR3: 0000000062e02000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: stack_depot_save_flags+0x40/0x850 lib/stackdepot.c:659 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x4f/0x80 mm/kasan/common.c:77 poison_kmalloc_redzone mm/kasan/common.c:400 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:417 kasan_kmalloc include/linux/kasan.h:262 [inline] __do_kmalloc_node mm/slub.c:5652 [inline] __kmalloc_noprof+0x411/0x800 mm/slub.c:5664 kmalloc_noprof include/linux/slab.h:961 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] cfg80211_inform_single_bss_data+0x91e/0x1ad0 net/wireless/scan.c:2345 cfg80211_inform_bss_data+0x203/0x3b40 net/wireless/scan.c:3228 cfg80211_inform_bss_frame_data+0x3c7/0x710 net/wireless/scan.c:3319 ieee80211_bss_info_update+0x749/0x9e0 net/mac80211/scan.c:230 ieee80211_scan_rx+0x593/0xa20 net/mac80211/scan.c:359 __ieee80211_rx_handle_packet net/mac80211/rx.c:5282 [inline] ieee80211_rx_list+0x2485/0x2f90 net/mac80211/rx.c:5539 ieee80211_rx_napi+0x1a8/0x3d0 net/mac80211/rx.c:5562 ieee80211_rx include/net/mac80211.h:5216 [inline] ieee80211_handle_queued_frames+0xe8/0x1e0 net/mac80211/main.c:452 tasklet_action_common+0x358/0x550 kernel/softirq.c:925 handle_softirqs+0x27d/0x850 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xca/0x1f0 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+0x242/0x940 kernel/sched/core.c:5114 Code: 0f 84 c2 01 00 00 48 85 db 0f 85 e9 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 68 13 ba 09 e8 33 3e 37 00 fb 4c 8b 65 c0 <49> 8d bc 24 48 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0 RSP: 0018:ffffc9000b677238 EFLAGS: 00000282 RAX: 84437c22aee08e00 RBX: 0000000000000000 RCX: 84437c22aee08e00 RDX: 0000000000000000 RSI: ffffffff8d76bea1 RDI: ffffffff8bbfc660 RBP: ffffc9000b677290 R08: ffffffff8f805b77 R09: 1ffffffff1f00b6e R10: dffffc0000000000 R11: fffffbfff1f00b6f R12: ffff88807e2d5b80 R13: dffffc0000000000 R14: ffff888065c19e80 R15: ffff8880b883b358 context_switch kernel/sched/core.c:5259 [inline] __schedule+0x14c4/0x5000 kernel/sched/core.c:6863 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:7047 preempt_schedule+0xae/0xc0 kernel/sched/core.c:7071 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0xfd/0x110 kernel/locking/spinlock.c:194 rcu_preempt_deferred_qs_irqrestore+0x89c/0xce0 kernel/rcu/tree_plugin.h:-1 rcu_read_unlock_special+0x3d8/0x520 kernel/rcu/tree_plugin.h:769 __rcu_read_unlock+0x84/0xe0 kernel/rcu/tree_plugin.h:438 rcu_read_unlock include/linux/rcupdate.h:899 [inline] class_rcu_destructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0x19ae/0x2390 arch/x86/kernel/unwind_orc.c:680 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:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 unpoison_slab_object mm/kasan/common.c:342 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:368 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4948 [inline] slab_alloc_node mm/slub.c:5258 [inline] kmem_cache_alloc_lru_noprof+0x35d/0x6d0 mm/slub.c:5277 sock_alloc_inode+0x28/0xc0 net/socket.c:322 alloc_inode+0x6a/0x1b0 fs/inode.c:346 new_inode_pseudo include/linux/fs.h:2965 [inline] sock_alloc net/socket.c:628 [inline] __sock_create+0x12d/0x9d0 net/socket.c:1560 sock_create net/socket.c:1654 [inline] __sys_socket_create net/socket.c:1691 [inline] __sys_socket+0xd7/0x320 net/socket.c:1738 __do_sys_socket net/socket.c:1752 [inline] __se_sys_socket net/socket.c:1750 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1750 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fdff438f749 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:00007fdff5255038 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007fdff45e5fa0 RCX: 00007fdff438f749 RDX: 0000000000000106 RSI: 0000000000000001 RDI: 000000000000000a RBP: 00007fdff4413f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fdff45e6038 R14: 00007fdff45e5fa0 R15: 00007ffdfcd15018 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 16456 Comm: kworker/u8:28 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+0xccf/0x12b0 kernel/smp.c:877 Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 4a 94 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 f5 8f 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 d9 8f RSP: 0018:ffffc9000470f620 EFLAGS: 00000293 RAX: ffffffff81b5ba87 RBX: 1ffff11017108545 RCX: ffff888057c55b80 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000470f7a0 R08: ffffffff8f805b77 R09: 1ffffffff1f00b6e R10: dffffc0000000000 R11: fffffbfff1f00b6f R12: ffff8880b8842a28 R13: dffffc0000000000 R14: ffff8880b893b9c0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881261b0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbcc5b17d60 CR3: 000000000dd3a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 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+0x5f9/0x1130 arch/x86/kernel/alternative.c:2921 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+0xad/0x240 mm/kfence/core.c:854 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246