watchdog: BUG: soft lockup - CPU#1 stuck for 143s! [syz.4.59:6167] Modules linked in: irq event stamp: 14850583 hardirqs last enabled at (14850582): [] irqentry_exit+0x5dd/0x660 kernel/entry/common.c:219 hardirqs last disabled at (14850583): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (12921084): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (12921084): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (12921084): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 softirqs last disabled at (12921087): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (12921087): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (12921087): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 6167 Comm: syz.4.59 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:lock_release+0x2a6/0x3b0 kernel/locking/lockdep.c:5893 Code: 4d 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 75 52 f7 c3 00 02 00 00 74 01 fb 65 48 8b 05 da 91 d8 10 <48> 3b 44 24 28 75 75 48 83 c4 30 5b 41 5c 41 5d 41 5e 41 5f 5d e9 RSP: 0018:ffffc90000a083d0 EFLAGS: 00000206 RAX: c30ea0a411e2dc00 RBX: 0000000000000202 RCX: c30ea0a411e2dc00 RDX: 0000000000000008 RSI: ffffffff8d95208b RDI: ffffffff8bbfc5e0 RBP: ffff88802ce067f0 R08: ffffc90000a08567 R09: 0000000000000000 R10: ffffc90000a08558 R11: fffff520001410ad R12: 0000000000000008 R13: 0000000000000008 R14: ffffffff8df41cc0 R15: ffff88802ce05b80 FS: 00007fd8b94be6c0(0000) GS:ffff8881261b1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c2b1bc8 CR3: 000000002eb8c000 CR4: 00000000003526f0 Call Trace: rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:897 [inline] class_rcu_destructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0x1ab1/0x23d0 arch/x86/kernel/unwind_orc.c:695 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_node_noprof+0x433/0x710 mm/slub.c:5310 kmalloc_reserve+0xbd/0x290 net/core/skbuff.c:586 __alloc_skb+0x27e/0x430 net/core/skbuff.c:690 alloc_skb include/linux/skbuff.h:1383 [inline] ndisc_alloc_skb+0x9f/0x480 net/ipv6/ndisc.c:420 ndisc_send_rs+0x2b5/0x630 net/ipv6/ndisc.c:706 addrconf_rs_timer+0x369/0x670 net/ipv6/addrconf.c:4037 call_timer_fn+0x16e/0x590 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x61a/0x860 kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2404 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:__preempt_count_sub arch/x86/include/asm/preempt.h:85 [inline] RIP: 0010:preempt_schedule_common+0x8a/0xd0 kernel/sched/core.c:7049 Code: 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 7a c4 dc f6 49 89 1e bf 01 00 00 00 e8 4d aa ff ff 65 8b 05 06 7f 2c 07 <65> ff 0d ff 7e 2c 07 65 48 8b 1c 25 08 f0 76 92 48 89 d8 48 c1 e8 RSP: 0018:ffffc9000b9e76a0 EFLAGS: 00000246 RAX: 0000000080000001 RBX: ffffffff8b4a707e RCX: c30ea0a411e2dc00 RDX: 0000000000000000 RSI: ffffffff8bbfc5c0 RDI: ffffffff8bbfc580 RBP: ffffc9000b9e7748 R08: ffffffff8f805a77 R09: 1ffffffff1f00b4e R10: dffffc0000000000 R11: fffffbfff1f00b4f R12: 0000000000000000 R13: ffffffff927bed80 R14: ffff88802ce070a0 R15: dffffc0000000000 preempt_schedule+0xae/0xc0 kernel/sched/core.c:7071 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12 on_each_cpu_cond_mask+0x7a/0x80 kernel/smp.c:1044 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 tracepoint_add_func+0x994/0xa10 kernel/tracepoint.c:315 tracepoint_probe_register_prio kernel/tracepoint.c:464 [inline] tracepoint_probe_register+0x5d/0x90 kernel/tracepoint.c:484 perf_trace_event_reg kernel/trace/trace_event_perf.c:129 [inline] perf_trace_event_init+0x4e1/0x9d0 kernel/trace/trace_event_perf.c:202 perf_trace_init+0x23d/0x2d0 kernel/trace/trace_event_perf.c:226 perf_tp_event_init+0x8d/0x120 kernel/events/core.c:10943 perf_try_init_event+0x17f/0x870 kernel/events/core.c:12686 perf_init_event kernel/events/core.c:12784 [inline] perf_event_alloc+0x1430/0x2d50 kernel/events/core.c:13059 __do_sys_perf_event_open kernel/events/core.c:13577 [inline] __se_sys_perf_event_open+0x756/0x1d90 kernel/events/core.c:13458 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: 0033:0x7fd8b858f749 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:00007fd8b94be038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007fd8b87e5fa0 RCX: 00007fd8b858f749 RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000200000000040 RBP: 00007fd8b8613f91 R08: 0000000000000008 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd8b87e6038 R14: 00007fd8b87e5fa0 R15: 00007ffec888aa28 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 52 Comm: kworker/u9:0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: hci0 hci_cmd_timeout RIP: 0010:vsnprintf+0xbe/0xee0 lib/vsprintf.c:-1 Code: 00 00 41 0f b6 1f 31 ff 89 de e8 9d 28 7c f6 85 db 0f 84 20 0d 00 00 4c 89 64 24 38 4c 8b 64 24 10 49 8d 44 24 08 48 89 04 24 <49> 8d 44 24 10 4c 89 e1 48 c1 e9 03 48 89 4c 24 18 48 89 44 24 28 RSP: 0018:ffffc90000bd6f50 EFLAGS: 00000202 RAX: ffffc90000bd7048 RBX: 000000000000005b RCX: 0000000000000000 RDX: ffff88801ab7bd00 RSI: 000000000000005b RDI: 0000000000000000 RBP: ffffc90000bd70d0 R08: ffffc90000bd7057 R09: 0000000000000000 R10: ffffc90000bd7040 R11: fffff5200017ae0b R12: ffffc90000bd7040 R13: dffffc0000000000 R14: ffffc90000bd7220 R15: ffffffff8b6bb980 FS: 0000000000000000(0000) GS:ffff8881260b1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055ae990bb168 CR3: 00000000302ac000 CR4: 00000000003526f0 Call Trace: sprintf+0xd9/0x120 lib/vsprintf.c:3110 print_time kernel/printk/printk.c:1357 [inline] info_print_prefix+0x155/0x310 kernel/printk/printk.c:1383 record_print_text+0x154/0x420 kernel/printk/printk.c:1432 printk_get_next_message+0x26d/0x7b0 kernel/printk/printk.c:3018 console_emit_next_record kernel/printk/printk.c:3083 [inline] console_flush_one_record kernel/printk/printk.c:3215 [inline] console_flush_all+0x514/0xb60 kernel/printk/printk.c:3289 __console_flush_and_unlock kernel/printk/printk.c:3319 [inline] console_unlock+0xbb/0x190 kernel/printk/printk.c:3359 vprintk_emit+0x4f8/0x5f0 kernel/printk/printk.c:2426 _printk+0xcf/0x120 kernel/printk/printk.c:2451 bt_err+0x10b/0x160 net/bluetooth/lib.c:296 hci_cmd_timeout+0xd8/0x1e0 net/bluetooth/hci_core.c:1469 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