watchdog: BUG: soft lockup - CPU#0 stuck for 144s! [syz.8.8554:13312] Modules linked in: irq event stamp: 11571269 hardirqs last enabled at (11571268): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 hardirqs last disabled at (11571269): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (4633412): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (4633412): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (4633412): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (4633415): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (4633415): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (4633415): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 13312 Comm: syz.8.8554 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline] RIP: 0010:write_comp_data kernel/kcov.c:246 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x17/0x90 kernel/kcov.c:321 Code: 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 04 24 65 48 8b 0d 48 d6 56 11 65 8b 15 69 d6 56 11 <81> e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 57 83 b9 a4 16 00 00 RSP: 0018:ffffc90000006aa8 EFLAGS: 00000246 RAX: ffffffff81f90161 RBX: 0000000000000303 RCX: ffff88809d2d8000 RDX: 0000000000000303 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000006c00 R08: 0000000000000002 R09: 0000000000000000 R10: ffffc90000006dd8 R11: ffffffff81b0d0f0 R12: ffffffff8e62a540 R13: dffffc0000000000 R14: ffff88809d2d8000 R15: dffffc0000000000 FS: 00007f18abfda6c0(0000) GS:ffff888125457000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000480 CR3: 0000000048a4e000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: interrupt_context_level include/linux/preempt.h:95 [inline] get_recursion_context kernel/events/internal.h:215 [inline] perf_swevent_get_recursion_context+0x41/0x100 kernel/events/core.c:11015 perf_trace_buf_alloc+0x43/0x280 kernel/trace/trace_event_perf.c:410 do_perf_trace_lock_acquire include/trace/events/lock.h:24 [inline] perf_trace_lock_acquire+0x1a5/0x440 include/trace/events/lock.h:24 __do_trace_lock_acquire include/trace/events/lock.h:24 [inline] trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0x2a4/0x2e0 kernel/locking/lockdep.c:5831 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 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2685 [inline] slab_free mm/slub.c:6165 [inline] kfree+0x1c1/0x630 mm/slub.c:6483 ieee80211_inform_bss+0xc75/0x1160 net/mac80211/scan.c:164 rdev_inform_bss net/wireless/rdev-ops.h:418 [inline] cfg80211_inform_single_bss_data+0xd08/0x1b70 net/wireless/scan.c:2372 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:preempt_schedule_irq+0x48/0xa0 kernel/sched/core.c:7238 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 a3 38 e3 f5 e8 ee e8 1c f6 fb bf 01 00 00 00 c3 a6 ff ff 9c 58 fa a9 00 02 00 00 74 05 e8 c4 ea 1c f6 bf 01 RSP: 0018:ffffc90004587d80 EFLAGS: 00000202 RAX: 000000000046b345 RBX: 0000000000000000 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8defacfd RDI: 0000000000000001 RBP: 0000000000000000 R08: ffffffff9011cfb7 R09: 1ffffffff20239f6 R10: dffffc0000000000 R11: fffffbfff20239f7 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 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:__sanitizer_cov_trace_pc+0x45/0x70 kernel/kcov.c:222 Code: ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 a4 16 00 00 00 74 2c 8b 91 80 16 00 00 83 fa 02 75 21 48 8b 91 88 16 00 00 48 8b 32 <48> 8d 7e 01 8b 89 84 16 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 RSP: 0018:ffffc90004587ea8 EFLAGS: 00000246 RAX: ffffffff81b8ca81 RBX: ffffc90004587f48 RCX: ffff88809d2d8000 RDX: ffffc90022417000 RSI: 0000000000000f65 RDI: ffffc90004587f48 RBP: ffffc90004587f38 R08: ffffffff9011cfb7 R09: 1ffffffff20239f6 R10: dffffc0000000000 R11: fffffbfff20239f7 R12: 00000000000000ca R13: 0000000000000000 R14: dffffc0000000000 R15: ffff88809d2d8000 __x64_sys_futex+0x21/0xf0 kernel/futex/syscalls.c:188 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f18ab19c819 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:00007f18abfda0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007f18ab415fa8 RCX: 00007f18ab19c819 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f18ab415fac RBP: 00007f18ab415fa0 R08: 3fffffffffffffff R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f18ab416038 R14: 00007fff24a4cbe0 R15: 00007fff24a4ccc8 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 12870 Comm: kworker/u8:15 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 d4 eb 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 7f e7 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 63 e7 RSP: 0018:ffffc900040f7700 EFLAGS: 00000293 RAX: ffffffff81b9cd6d RBX: 1ffff110170c8525 RCX: ffff88807f271e80 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc900040f7840 R08: ffffffff9011cfb7 R09: 1ffffffff20239f6 R10: dffffc0000000000 R11: fffffbfff20239f7 R12: ffff8880b8642928 R13: dffffc0000000000 R14: ffff8880b873c000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125557000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f50088a340e CR3: 000000000e54c000 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: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_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:907 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