watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.0.650:8693] Modules linked in: irq event stamp: 10818303 hardirqs last enabled at (10818302): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 hardirqs last disabled at (10818303): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (112560): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (112560): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (112560): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (112563): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (112563): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (112563): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 8693 Comm: syz.0.650 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210 Code: 89 fb e8 23 00 00 00 48 8b 3d 04 8b 55 0c 48 89 de 5b e9 b3 9b 5e 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 8b 04 24 65 48 8b 0d 28 db 56 11 65 8b 15 49 db 56 RSP: 0018:ffffc90000006aa8 EFLAGS: 00000246 RAX: ffffffff81f901bc RBX: 0000000000000001 RCX: 0000000000000100 RDX: ffff88801e350000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000002 R09: 0000000000000000 R10: ffffc90000006dd8 R11: ffffffff81b0d0f0 R12: 1ffff11003c6a292 R13: dffffc0000000000 R14: ffff88801e351495 R15: dffffc0000000000 FS: 00007ff3a847b6c0(0000) GS:ffff888125457000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000005f05a000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: get_recursion_context kernel/events/internal.h:220 [inline] perf_swevent_get_recursion_context+0xb1/0x100 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:ffffc9000be7f7d0 EFLAGS: 00000206 RAX: 00000000000008a3 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:check_kcov_mode kernel/kcov.c:183 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x17/0x70 kernel/kcov.c:217 Code: cc cc cc 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 28 db 56 11 65 8b 15 49 db 56 11 <81> e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 a4 16 00 00 RSP: 0018:ffffc9000be7f8f0 EFLAGS: 00000202 RAX: ffffffff81b85e62 RBX: 00000000ffffffff RCX: ffff88801e350000 RDX: 0000000080000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: dffffc0000000000 R08: ffffffff81b857d0 R09: ffffffff8e75e5e0 R10: ffffc9000be7f6e0 R11: ffffffffa02016d0 R12: 1ffff920017cff5f R13: 0000000000000001 R14: ffff88807c18c000 R15: ffffc9000be7fae8 __futex_hash_private kernel/futex/core.c:190 [inline] __futex_hash+0x3f2/0x760 kernel/futex/core.c:423 futex_hash+0xe5/0x2d0 kernel/futex/core.c:309 class_hb_constructor kernel/futex/futex.h:240 [inline] futex_wait_setup+0xde/0x560 kernel/futex/waitwake.c:623 __futex_wait+0x173/0x420 kernel/futex/waitwake.c:682 futex_wait+0x119/0x380 kernel/futex/waitwake.c:715 do_futex+0x333/0x420 kernel/futex/syscalls.c:130 __do_sys_futex kernel/futex/syscalls.c:207 [inline] __se_sys_futex+0x3a8/0x450 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: 0033:0x7ff3a759c819 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:00007ff3a847b0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007ff3a7816098 RCX: 00007ff3a759c819 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007ff3a7816098 RBP: 00007ff3a7816090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff3a7816128 R14: 00007fffbae187b0 R15: 00007fffbae18898 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 23 Comm: ksoftirqd/1 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:26 [inline] RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:109 [inline] RIP: 0010:lockdep_hardirqs_on_prepare+0x52/0x260 kernel/locking/lockdep.c:4391 Code: 00 00 65 8b 05 5f 5e 7b 11 85 c0 0f 85 74 01 00 00 65 8b 05 d8 5a 7b 11 85 c0 0f 85 65 01 00 00 83 3d 11 7d 86 18 00 75 37 9c <58> a9 00 02 00 00 0f 85 a2 01 00 00 8b 05 fc 7c 86 18 85 c0 75 0d RSP: 0018:ffffc900001d7ca0 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000040 RCX: 0000000080000101 RDX: 0000000000000000 RSI: ffffffff8c27d0e0 RDI: ffffffff8c27d0a0 RBP: 0000000000000006 R08: ffffffff9011cfb7 R09: 1ffffffff20239f6 R10: dffffc0000000000 R11: fffffbfff20239f7 R12: 0000000000000100 R13: 0000000000000006 R14: ffff88801daf8000 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff888125557000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0b3f03dd9a CR3: 0000000033002000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: trace_hardirqs_on+0x28/0x40 kernel/trace/trace_preemptirq.c:78 handle_softirqs+0x158/0x870 kernel/softirq.c:606 run_ksoftirqd+0x36/0x60 kernel/softirq.c:1063 smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160 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