watchdog: BUG: soft lockup - CPU#1 stuck for 144s! [syz.7.440:8632] Modules linked in: irq event stamp: 13642455 hardirqs last enabled at (13642454): [] irqentry_exit+0x5dd/0x660 kernel/entry/common.c:219 hardirqs last disabled at (13642455): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (12617940): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (12617940): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (12617940): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 softirqs last disabled at (12617943): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (12617943): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (12617943): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 8632 Comm: syz.7.440 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:lock_acquire+0x16c/0x340 kernel/locking/lockdep.c:5872 Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 d4 38 e0 10 <48> 3b 44 24 58 0f 85 e5 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e RSP: 0018:ffffc90000a081f8 EFLAGS: 00000206 RAX: ca9a5d3aae761f00 RBX: 0000000000000000 RCX: ca9a5d3aae761f00 RDX: 000000008eba6367 RSI: ffffffff8d978ff2 RDI: ffffffff8bc08360 RBP: ffffffff81743f85 R08: ffffffff81743f85 R09: ffffffff8df41a20 R10: ffffc90000a08000 R11: ffffffffa0201654 R12: 0000000000000002 R13: ffffffff8df41a20 R14: 0000000000000000 R15: 0000000000000246 FS: 00007f2ca516f6c0(0000) GS:ffff888125f35000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c267dd4 CR3: 000000007e090000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: 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+0xc2/0x23d0 arch/x86/kernel/unwind_orc.c:495 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 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2540 [inline] slab_free mm/slub.c:6668 [inline] kmem_cache_free+0x197/0x620 mm/slub.c:6779 skb_release_data+0x62d/0x7c0 net/core/skbuff.c:1107 skb_release_all net/core/skbuff.c:1182 [inline] __kfree_skb net/core/skbuff.c:1196 [inline] sk_skb_reason_drop+0x127/0x170 net/core/skbuff.c:1234 kfree_skb_reason include/linux/skbuff.h:1322 [inline] kfree_skb include/linux/skbuff.h:1331 [inline] ip6_mc_input+0x8de/0xb70 net/ipv6/ip6_input.c:593 NF_HOOK+0x30c/0x3a0 include/linux/netfilter.h:318 __netif_receive_skb_one_core net/core/dev.c:6137 [inline] __netif_receive_skb+0xd3/0x380 net/core/dev.c:6250 process_backlog+0x622/0x1500 net/core/dev.c:6602 __napi_poll+0xae/0x320 net/core/dev.c:7666 napi_poll net/core/dev.c:7729 [inline] net_rx_action+0x672/0xe50 net/core/dev.c:7881 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_schedule_irq+0xb0/0x150 kernel/sched/core.c:7190 Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 10 00 00 00 74 64 bf 01 00 00 00 e8 ab 26 34 f6 e8 46 a4 6c f6 fb bf 01 00 00 00 1b a8 ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24 RSP: 0018:ffffc900023df5a0 EFLAGS: 00000286 RAX: ca9a5d3aae761f00 RBX: 0000000000000000 RCX: ca9a5d3aae761f00 RDX: 0000000000000000 RSI: ffffffff8d7922ac RDI: 0000000000000001 RBP: ffffc900023df650 R08: ffffffff8f821f77 R09: 1ffffffff1f043ee R10: dffffc0000000000 R11: fffffbfff1f043ef R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff9200047beb4 irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216 Code: 8b 3d c4 83 d9 0b 48 89 de 5b e9 03 35 5b 00 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 0c 25 08 b0 7e 92 65 8b 15 c8 fd bc 10 81 e2 00 01 ff 00 RSP: 0018:ffffc900023df768 EFLAGS: 00000282 RAX: ffffffff81d0ef0a RBX: 00007f2ca438f749 RCX: ca9a5d3aae761f00 RDX: 0000000000000000 RSI: ffffffff8d978ff2 RDI: 00007f2ca438f749 RBP: 0000000000000001 R08: ffffffff81ac186d R09: ffffffff8df41a20 R10: ffffc900023df4e0 R11: ffffffffa0201654 R12: ffff888076940000 R13: 0000000000000800 R14: 00007f2ca438f749 R15: 1ffff9200047bf0a is_bpf_text_address+0x1a/0x2b0 kernel/bpf/core.c:741 kernel_text_address+0xa5/0xe0 kernel/extable.c:125 __kernel_text_address+0xd/0x40 kernel/extable.c:79 unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:385 arch_stack_walk+0xfc/0x150 arch/x86/kernel/stacktrace.c:26 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:397 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:414 kasan_kmalloc include/linux/kasan.h:262 [inline] __kmalloc_cache_noprof+0x3e2/0x700 mm/slub.c:5776 kmalloc_noprof include/linux/slab.h:957 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] btf_parse kernel/bpf/btf.c:5776 [inline] btf_new_fd+0x137/0xc90 kernel/bpf/btf.c:8025 __sys_bpf+0x3ed/0x860 kernel/bpf/syscall.c:6209 __do_sys_bpf kernel/bpf/syscall.c:6274 [inline] __se_sys_bpf kernel/bpf/syscall.c:6272 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6272 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: 0033:0x7f2ca438f749 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:00007f2ca516f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f2ca45e5fa0 RCX: 00007f2ca438f749 RDX: 0000000000000020 RSI: 0000200000000380 RDI: 0000000000000012 RBP: 00007f2ca4413f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f2ca45e6038 R14: 00007f2ca45e5fa0 R15: 00007ffc8dc453a8 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 5837 Comm: kworker/u9:4 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: hci2 hci_cmd_timeout RIP: 0010:class_preempt_destructor include/linux/preempt.h:468 [inline] RIP: 0010:__migrate_enable include/linux/sched.h:2389 [inline] RIP: 0010:migrate_enable include/linux/sched.h:2429 [inline] RIP: 0010:bpf_prog_run_array include/linux/bpf.h:2362 [inline] RIP: 0010:trace_call_bpf+0x660/0xb60 kernel/trace/bpf_trace.c:145 Code: 41 c7 07 00 00 65 48 8b 05 65 5d b1 10 48 8d 98 e0 66 80 92 48 89 d8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 82 04 00 00 ff 0b 01 00 00 00 e8 a6 ba c3 ff 65 8b 1d 3f 5d b1 10 31 ff 89 de e8 RSP: 0018:ffffc90000007a20 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffff8880b863b6e0 RCX: ffff88802f96db80 RDX: 0000000000010000 RSI: 0000000000000001 RDI: ffff88802f96dfe0 RBP: ffffc90000007b38 R08: ffffc90000007acf R09: 0000000000000000 R10: ffffc90000007ac0 R11: ffffffffa0201654 R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000001 R15: ffff88802f96e000 FS: 0000000000000000(0000) GS:ffff888125e35000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff677fbf40 CR3: 000000004729a000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:11000 do_perf_trace_lock_acquire include/trace/events/lock.h:24 [inline] perf_trace_lock_acquire+0x335/0x410 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+0x2fb/0x340 kernel/locking/lockdep.c:5831 seqcount_lockdep_reader_access+0xcf/0x1c0 include/linux/seqlock.h:72 ktime_get_update_offsets_now+0x67/0x3d0 kernel/time/timekeeping.c:2570 hrtimer_update_base kernel/time/hrtimer.c:633 [inline] hrtimer_interrupt+0x132/0xaa0 kernel/time/hrtimer.c:1885 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x102/0x3e0 arch/x86/kernel/apic/apic.c:1062 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2037 [inline] RIP: 0010:vprintk_emit+0x4d0/0x5f0 kernel/printk/printk.c:2425 Code: 0f 84 34 ff ff ff e8 cf 62 20 00 fb eb 44 e8 c7 62 20 00 e8 82 62 ba 09 4d 85 f6 74 94 e8 b8 62 20 00 fb 48 c7 c7 e0 58 f3 8d <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 28 26 RSP: 0018:ffffc900040df6e0 EFLAGS: 00000293 RAX: ffffffff81a14f98 RBX: ffffffff81a14df1 RCX: ffff88802f96db80 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8df358e0 RBP: ffffc900040df7f0 R08: ffffffff8f821f77 R09: 1ffffffff1f043ee R10: dffffc0000000000 R11: fffffbfff1f043ef R12: 0000000000000000 R13: 000000000000002a R14: 0000000000000200 R15: 1ffff9200081bee0 _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