watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.1.2:5953] Modules linked in: irq event stamp: 14461009 hardirqs last enabled at (14461008): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:214 hardirqs last disabled at (14461009): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1052 softirqs last enabled at (14431146): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (14431146): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (14431146): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 softirqs last disabled at (14431149): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (14431149): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (14431149): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 5953 Comm: syz.1.2 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:__read_once_word_nocheck+0x3/0x10 include/asm-generic/rwonce.h:67 Code: b2 00 48 ba 00 00 00 00 00 fc ff df e9 88 fc ff ff 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 8b 07 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc900000075b0 EFLAGS: 00000202 RAX: ffffffff81ad3807 RBX: ffffc90000007e18 RCX: 1ffff92000000e01 RDX: ffffffff900f512e RSI: 0000000000000002 RDI: ffffc90000007e18 RBP: 1ffff92000000ed2 R08: 0000000000000001 R09: ffffffff81738c45 R10: ffffc90000007188 R11: fffff52000000e33 R12: ffffc90000008000 R13: 1ffff92000000ed3 R14: ffffc90000007688 R15: ffffc90000000000 FS: 00007f5caefc96c0(0000) GS:ffff888126138000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000018c0 CR3: 0000000077df8000 CR4: 00000000003526f0 Call Trace: deref_stack_reg arch/x86/kernel/unwind_orc.c:406 [inline] unwind_next_frame+0xc3c/0x2390 arch/x86/kernel/unwind_orc.c:585 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:4978 [inline] slab_alloc_node mm/slub.c:5288 [inline] kmem_cache_alloc_node_noprof+0x433/0x710 mm/slub.c:5340 __alloc_skb+0x112/0x2d0 net/core/skbuff.c:660 alloc_skb include/linux/skbuff.h:1383 [inline] lapb_send_control+0x38/0x3e0 net/lapb/lapb_subr.c:227 lapb_t1timer_expiry+0x699/0xab0 net/lapb/lapb_timer.c:-1 call_timer_fn+0x17e/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+0x286/0x870 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:1052 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:interrupt_context_level include/linux/preempt.h:95 [inline] RIP: 0010:get_recursion_context kernel/events/internal.h:215 [inline] RIP: 0010:perf_swevent_get_recursion_context+0x37/0x100 kernel/events/core.c:10617 Code: bf 00 00 00 00 00 fc ff df e8 55 f0 ce ff 65 4c 8b 34 25 08 80 6e 92 65 8b 05 95 69 7d 10 89 c3 48 89 de 48 81 e6 00 00 f0 00 <40> 0f 95 c5 31 ff e8 0e f5 ce ff 48 89 de 48 81 e6 00 00 ff 00 41 RSP: 0018:ffffc9000564e7f0 EFLAGS: 00000246 RAX: 0000000000000002 RBX: 0000000000000002 RCX: 0000000000080000 RDX: ffffc900047ba000 RSI: 0000000000000000 RDI: 000000000000036d RBP: ffffc9000564e958 R08: 0000000000000002 R09: 0000000000000000 R10: ffffc9000564eb38 R11: ffffffff81ac31b0 R12: 1ffff92000ac9d14 R13: dffffc0000000000 R14: ffff88802ac43c80 R15: dffffc0000000000 perf_trace_buf_alloc+0x59/0x2a0 kernel/trace/trace_event_perf.c:410 do_perf_trace_lock_acquire include/trace/events/lock.h:24 [inline] perf_trace_lock_acquire+0x196/0x410 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+0x311/0x360 kernel/locking/lockdep.c:5831 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:867 [inline] class_rcu_constructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0xc2/0x2390 arch/x86/kernel/unwind_orc.c:479 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:56 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:559 __call_rcu_common kernel/rcu/tree.c:3123 [inline] call_rcu+0x157/0x9c0 kernel/rcu/tree.c:3243 context_switch kernel/sched/core.c:5328 [inline] __schedule+0x17a0/0x4cc0 kernel/sched/core.c:6929 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7256 irqentry_exit+0x6f/0x90 kernel/entry/common.c:211 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:unwind_next_frame+0x374/0x2390 arch/x86/kernel/unwind_orc.c:505 Code: ea 48 01 d2 48 01 f2 48 bd 00 00 00 00 00 fc ff df 0f 84 37 01 00 00 4c 8d 62 04 4c 8d 6a 05 4c 89 e0 48 c1 e8 03 0f b6 04 28 <84> c0 0f 85 6d 19 00 00 4c 89 e8 48 c1 e8 03 0f b6 04 28 84 c0 0f RSP: 0018:ffffc9000564f358 EFLAGS: 00000a02 RAX: 0000000000000000 RBX: ffffffff8f958a74 RCX: ffffffff8f958a78 RDX: ffffffff90128b36 RSI: ffffffff90128b1e RDI: ffffffff8bbf0d80 RBP: dffffc0000000000 R08: 000000000000000f R09: ffffffff81738c45 R10: ffffc9000564ef48 R11: fffff52000ac9deb R12: ffffffff90128b3a R13: ffffffff90128b3b R14: ffffc9000564f428 R15: ffffffff8f958a74 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 poison_kmalloc_redzone mm/kasan/common.c:400 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:417 kasan_kmalloc include/linux/kasan.h:262 [inline] __kmalloc_cache_node_noprof+0x471/0x6f0 mm/slub.c:5783 kmalloc_node_noprof include/linux/slab.h:983 [inline] __get_vm_area_node+0x13f/0x300 mm/vmalloc.c:3182 __vmalloc_node_range_noprof+0x30c/0x12d0 mm/vmalloc.c:3857 __vmalloc_node_noprof mm/vmalloc.c:3960 [inline] __vmalloc_noprof+0xb1/0xf0 mm/vmalloc.c:3974 bpf_prog_alloc_no_stats+0x4a/0x4d0 kernel/bpf/core.c:106 bpf_prog_alloc+0x3c/0x1a0 kernel/bpf/core.c:153 bpf_prog_load+0x735/0x1a10 kernel/bpf/syscall.c:2991 __sys_bpf+0x507/0x860 kernel/bpf/syscall.c:6163 __do_sys_bpf kernel/bpf/syscall.c:6273 [inline] __se_sys_bpf kernel/bpf/syscall.c:6271 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6271 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5cae18f749 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:00007f5caefc9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f5cae3e5fa0 RCX: 00007f5cae18f749 RDX: 0000000000000094 RSI: 00002000000018c0 RDI: 0000000000000005 RBP: 00007f5cae213f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5cae3e6038 R14: 00007f5cae3e5fa0 R15: 00007fff85aa1c68 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5151 Comm: kworker/u9:1 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: hci3 hci_cmd_timeout RIP: 0010:lock_is_held_type+0xd/0x190 kernel/locking/lockdep.c:5925 Code: fc ff ff 66 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 f3 0f 1e fa 55 41 57 41 56 41 55 41 54 <53> 48 83 ec 10 65 48 8b 05 26 9b 27 07 48 89 44 24 08 bb ff ff ff RSP: 0018:ffffc90000a08bc0 EFLAGS: 00000002 RAX: 1ffffffff1be8501 RBX: ffff88801a0cd780 RCX: 64f4e2c38cdab900 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffffffff8df3d6e0 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff81943f89 R10: dffffc0000000000 R11: ffffffff81943c80 R12: ffffffff8d92edd8 R13: 0000000000000001 R14: dffffc0000000000 R15: ffffffff8d92edd8 FS: 0000000000000000(0000) GS:ffff888126238000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555576a3e5c8 CR3: 000000006b42c000 CR4: 00000000003526f0 Call Trace: test_idle_cores kernel/sched/fair.c:7565 [inline] select_idle_sibling kernel/sched/fair.c:7920 [inline] select_task_rq_fair+0x1f0b/0x3570 kernel/sched/fair.c:8628 select_task_rq kernel/sched/core.c:3572 [inline] try_to_wake_up+0x4d8/0x12b0 kernel/sched/core.c:4281 hrtimer_wakeup+0x4e/0x60 kernel/time/hrtimer.c:2013 __run_hrtimer kernel/time/hrtimer.c:1777 [inline] __hrtimer_run_queues+0x52c/0xc60 kernel/time/hrtimer.c:1841 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline] __sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1058 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1052 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2034 [inline] RIP: 0010:vprintk_emit+0x49d/0x590 kernel/printk/printk.c:2422 Code: 0f 84 34 ff ff ff e8 c2 eb 1f 00 fb eb 44 e8 ba eb 1f 00 e8 e5 c6 a6 09 4d 85 f6 74 94 e8 ab eb 1f 00 fb 48 c7 c7 c0 16 f3 8d <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 4b 39 RSP: 0018:ffffc9000f227700 EFLAGS: 00000293 RAX: ffffffff81a01b35 RBX: ffffffff81a0198e RCX: ffff888033849e40 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8df316c0 RBP: ffffc9000f227810 R08: ffffffff8f7cee77 R09: 1ffffffff1ef9dce R10: dffffc0000000000 R11: fffffbfff1ef9dcf R12: 0000000000000000 R13: 000000000000002a R14: 0000000000000200 R15: 1ffff92001e44ee4 _printk+0xcf/0x120 kernel/printk/printk.c:2448 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:3263 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245