watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.7.2076:13984] Modules linked in: irq event stamp: 14185737 hardirqs last enabled at (14185736): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:200 hardirqs last disabled at (14185737): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1050 softirqs last enabled at (10956260): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (10956260): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (10956260): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (10956263): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (10956263): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (10956263): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 0 UID: 0 PID: 13984 Comm: syz.7.2076 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 RIP: 0010:perf_tp_event+0xfd/0x1380 kernel/events/core.c:10987 Code: 44 89 a4 24 d8 01 00 00 c7 84 24 dc 01 00 00 00 00 00 00 4c 89 6c 24 20 4c 89 ef 8b 34 24 e8 2a 36 d9 ff 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 44 cb 33 00 4c 8b 23 4d 85 e4 0f RSP: 0018:ffffc900000070c0 EFLAGS: 00000a02 RAX: 1ffffd1ffff048b6 RBX: ffffe8ffff8245b0 RCX: 0000000000000000 RDX: ffff88802f560000 RSI: 0000000000000102 RDI: ffffe8ffff82e684 RBP: ffffc90000007328 R08: ffffc9000000728f R09: 0000000000000000 R10: ffffc90000007280 R11: fffff52000000e52 R12: 000000000000002c R13: ffffe8ffff82e680 R14: ffffc90000007140 R15: dffffc0000000000 FS: 00007fabd6cb46c0(0000) GS:ffff888125c11000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000004 CR3: 000000005cdfa000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: perf_trace_run_bpf_submit+0xee/0x170 kernel/events/core.c:10923 do_perf_trace_lock include/trace/events/lock.h:50 [inline] perf_trace_lock+0x2f8/0x3b0 include/trace/events/lock.h:50 __do_trace_lock_release include/trace/events/lock.h:69 [inline] trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x3b2/0x3e0 kernel/locking/lockdep.c:5879 rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:871 [inline] class_rcu_destructor include/linux/rcupdate.h:1169 [inline] unwind_next_frame+0x19a9/0x2390 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:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:330 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:356 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4191 [inline] slab_alloc_node mm/slub.c:4240 [inline] kmem_cache_alloc_node_noprof+0x1bb/0x3c0 mm/slub.c:4292 __alloc_skb+0x112/0x2d0 net/core/skbuff.c:659 alloc_skb include/linux/skbuff.h:1336 [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+0x17b/0x5f0 kernel/time/timer.c:1747 expire_timers kernel/time/timer.c:1798 [inline] __run_timers kernel/time/timer.c:2372 [inline] __run_timer_base+0x61a/0x860 kernel/time/timer.c:2384 run_timer_base kernel/time/timer.c:2393 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403 handle_softirqs+0x283/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__schedule+0x155/0x4cc0 kernel/sched/core.c:6836 Code: 08 48 89 df e8 cc fa a7 f6 4c 8b 23 49 8d 9c 24 88 9a a2 92 49 89 df 49 c1 ef 03 48 b8 00 00 00 00 00 fc ff df 41 80 3c 07 00 <74> 08 48 89 df e8 a1 fa a7 f6 48 89 5c 24 58 4c 8b 33 49 8d 5e 20 RSP: 0018:ffffc90002f27940 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: ffff8880b863aa88 RCX: 1fc7e85bb1684700 RDX: 0000000000000000 RSI: ffffffff8be34460 RDI: ffffffff8be34420 RBP: ffffc90002f27b50 R08: ffffffff8fa3b537 R09: 1ffffffff1f476a6 R10: dffffc0000000000 R11: fffffbfff1f476a7 R12: ffff888125c11000 R13: 0000000000000001 R14: dffffc0000000000 R15: 1ffff110170c7551 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:7145 preempt_schedule+0xae/0xc0 kernel/sched/core.c:7169 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 __do_sys_perf_event_open kernel/events/core.c:13723 [inline] __se_sys_perf_event_open+0x1942/0x1d70 kernel/events/core.c:13364 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fabd5d8eec9 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:00007fabd6cb4038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007fabd5fe6090 RCX: 00007fabd5d8eec9 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 00002000000003c0 RBP: 00007fabd5e11f91 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fabd5fe6128 R14: 00007fabd5fe6090 R15: 00007fffacbfdb88 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5184 Comm: kworker/u9:1 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Workqueue: hci4 hci_cmd_timeout RIP: 0010:__preempt_count_dec_and_test arch/x86/include/asm/preempt.h:95 [inline] RIP: 0010:class_preempt_notrace_destructor include/linux/preempt.h:473 [inline] RIP: 0010:__do_trace_lock_release include/trace/events/lock.h:69 [inline] RIP: 0010:trace_lock_release include/trace/events/lock.h:69 [inline] RIP: 0010:lock_release+0x3b2/0x3e0 kernel/locking/lockdep.c:5879 Code: 89 fe 0f 83 9a fc ff ff 65 ff 05 f9 67 03 11 48 8b 05 b2 6d f0 0d 48 85 c0 74 0f 48 8b 78 08 4c 89 fe 48 89 da e8 4e 39 ff ff <65> ff 0d d7 67 03 11 49 89 dd 4d 89 fe 0f 85 65 fc ff ff e8 e6 3e RSP: 0018:ffffc9000f147488 EFLAGS: 00000046 RAX: 308b1863cb2e0a00 RBX: ffffffff81a079fc RCX: ffffe8ffff9245b0 RDX: ffffffff81a079fc RSI: ffffffff8be34460 RDI: ffffffff8be34420 RBP: ffffc9000f147650 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff52001e28e90 R12: dffffc0000000000 R13: ffffffff81a079fc R14: ffffffff8e12e358 R15: ffffffff8e12e358 FS: 0000000000000000(0000) GS:ffff888125d11000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555586f7f5c8 CR3: 00000000798d4000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __raw_spin_unlock include/linux/spinlock_api_smp.h:141 [inline] _raw_spin_unlock+0x16/0x50 kernel/locking/spinlock.c:186 console_lock_spinning_enable kernel/printk/printk.c:1920 [inline] console_emit_next_record kernel/printk/printk.c:3132 [inline] console_flush_all+0x6ac/0xc40 kernel/printk/printk.c:3226 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline] console_unlock+0xc4/0x270 kernel/printk/printk.c:3325 vprintk_emit+0x5b7/0x7a0 kernel/printk/printk.c:2450 _printk+0xcf/0x120 kernel/printk/printk.c:2475 bt_err+0x10b/0x160 net/bluetooth/lib.c:296 hci_cmd_timeout+0xff/0x1e0 net/bluetooth/hci_core.c:1473 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x70e/0x8a0 kernel/kthread.c:463 ret_from_fork+0x436/0x7d0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245