watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.7.95:6574] Modules linked in: irq event stamp: 14314075 hardirqs last enabled at (14314074): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 hardirqs last disabled at (14314075): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (6811300): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (6811300): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (6811300): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (6811303): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (6811303): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (6811303): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 6574 Comm: syz.7.95 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 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:ffffc90000006c78 EFLAGS: 00000286 RAX: efbef695cec47100 RBX: 0000000000000246 RCX: 0000000000000302 RDX: 00000000e7095f7a RSI: ffffffff8e169d5a RDI: ffffffff8c27ca00 RBP: 0000000000000000 R08: ffffffff81767e95 R09: ffffffff8e75e5e0 R10: ffffc90000006dd8 R11: ffffffff81b0c390 R12: 0000000000000002 R13: ffffffff8e75e5e0 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fad980bd6c0(0000) GS:ffff88812545a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4c2e1dde9c CR3: 0000000075ce6000 CR4: 00000000003526f0 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 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 e3 e7 e3 f5 e8 4e 86 1d f6 fb bf 01 00 00 00 c3 a6 ff ff 9c 58 fa a9 00 02 00 00 74 05 e8 24 88 1d f6 bf 01 RSP: 0018:ffffc90004787920 EFLAGS: 00000206 RAX: 000000000067eea5 RBX: 0000000000000000 RCX: 0000000000000001 RDX: 0000000000000006 RSI: ffffffff8def8e53 RDI: 0000000000000001 RBP: 0000000000000000 R08: ffffffff9011b4b7 R09: 1ffffffff2023696 R10: dffffc0000000000 R11: fffffbfff2023697 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:constant_test_bit arch/x86/include/asm/bitops.h:202 [inline] RIP: 0010:arch_test_bit arch/x86/include/asm/bitops.h:232 [inline] RIP: 0010:tif_test_bit include/linux/thread_info.h:199 [inline] RIP: 0010:tif_need_resched include/linux/thread_info.h:215 [inline] RIP: 0010:need_resched include/linux/sched.h:2249 [inline] RIP: 0010:preempt_schedule_common+0x11/0xd0 kernel/sched/core.c:7103 Code: 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 41 57 41 56 53 49 bf 00 00 00 00 00 fc ff df eb 0d <48> f7 03 10 00 00 00 0f 84 99 00 00 00 65 ff 05 4b 5d 6c 07 65 8b RSP: 0018:ffffc90004787a48 EFLAGS: 00000246 RAX: 1ffff1100f291000 RBX: ffff888079488000 RCX: 0000000000000002 RDX: 0000000000000000 RSI: ffffffff8c27c9e0 RDI: ffffffff8c27c9a0 RBP: ffffc90004787ab0 R08: ffffffff9011b4b7 R09: 1ffffffff2023696 R10: dffffc0000000000 R11: fffffbfff2023697 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff888079489548 R15: dffffc0000000000 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12 smp_call_function_single+0x469/0x580 kernel/smp.c:689 task_function_call kernel/events/core.c:123 [inline] perf_install_in_context+0x5c0/0x930 kernel/events/core.c:3202 __do_sys_perf_event_open kernel/events/core.c:14163 [inline] __se_sys_perf_event_open+0x192f/0x1d60 kernel/events/core.c:13805 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: 0033:0x7fad9719c799 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:00007fad980bd028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007fad97415fa0 RCX: 00007fad9719c799 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 00002000000012c0 RBP: 00007fad97232c99 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fad97416038 R14: 00007fad97415fa0 R15: 00007ffc74685658 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 12 Comm: kworker/u8:0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Workqueue: events_unbound cfg80211_wiphy_work RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63 Code: 4e 6c 02 c3 cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d e3 92 1a 00 fb f4 fc e9 02 00 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 RSP: 0018:ffffc90000116ce8 EFLAGS: 000002d3 RAX: ffffffff8175b07a RBX: 0000000000000003 RCX: ffff88801d2e8000 RDX: 0000000000000000 RSI: ffffffff8def8e53 RDI: ffffffff8c27ca00 RBP: 0000000000000003 R08: ffffffff9011b4b7 R09: 1ffffffff2023696 R10: dffffc0000000000 R11: fffffbfff2023697 R12: 0000000000000200 R13: 0000000000000000 R14: ffff88802bae0150 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff88812555a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055fcaa3510e8 CR3: 000000007cb1e000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: arch_safe_halt arch/x86/include/asm/paravirt.h:73 [inline] kvm_wait+0x10f/0x150 arch/x86/kernel/kvm.c:1101 pv_wait arch/x86/include/asm/paravirt-spinlock.h:83 [inline] pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:466 [inline] __pv_queued_spin_lock_slowpath+0x74c/0xbc0 kernel/locking/qspinlock.c:325 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt-spinlock.h:35 [inline] queued_spin_lock_slowpath arch/x86/include/asm/paravirt-spinlock.h:66 [inline] queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock+0x26c/0x2f0 kernel/locking/spinlock_debug.c:116 spin_lock_bh include/linux/spinlock.h:347 [inline] cfg80211_inform_single_bss_data+0xbb8/0x1b70 net/wireless/scan.c:2367 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_rx_bss_info net/mac80211/ibss.c:1094 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1575 [inline] ieee80211_ibss_rx_queued_mgmt+0x1901/0x2cd0 net/mac80211/ibss.c:1602 ieee80211_iface_process_skb net/mac80211/iface.c:1748 [inline] ieee80211_iface_work+0x84e/0x1340 net/mac80211/iface.c:1802 cfg80211_wiphy_work+0x2ab/0x4a0 net/wireless/core.c:440 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