watchdog: BUG: soft lockup - CPU#1 stuck for 143s! [syz.1.18:6009] Modules linked in: irq event stamp: 13742317 hardirqs last enabled at (13742316): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:214 hardirqs last disabled at (13742317): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1052 softirqs last enabled at (9966856): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (9966856): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (9966856): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 softirqs last disabled at (9966859): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (9966859): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (9966859): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 6009 Comm: syz.1.18 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:memset_orig+0x15/0xb0 arch/x86/lib/memset_64.S:57 Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01 01 01 48 0f af c1 <41> 89 f9 41 83 e1 07 75 74 48 89 d1 48 c1 e9 06 74 39 66 0f 1f 84 RSP: 0018:ffffc90000a08010 EFLAGS: 00000206 RAX: 0000000000000000 RBX: ffffc90000a08120 RCX: 0000000000000000 RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffffc90000a08138 RBP: dffffc0000000000 R08: ffffc90000a08147 R09: 1ffff92000141028 R10: ffffc90000a08138 R11: fffff52000141029 R12: ffffc900057e7d70 R13: ffffc90000a08138 R14: ffffc90000a080e8 R15: ffffc90000a08130 FS: 00007efd0c9f16c0(0000) GS:ffff88812623d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0dc75b3f98 CR3: 00000000295c6000 CR4: 00000000003526f0 Call Trace: unwind_next_frame+0xc98/0x2390 arch/x86/kernel/unwind_orc.c:592 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_noprof+0x3d5/0x6f0 mm/slub.c:5763 kmalloc_noprof include/linux/slab.h:957 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] ref_tracker_alloc+0x133/0x460 lib/ref_tracker.c:271 __netdev_tracker_alloc include/linux/netdevice.h:4375 [inline] netdev_hold include/linux/netdevice.h:4404 [inline] ___neigh_create+0xc9e/0x2260 net/core/neighbour.c:665 ip6_finish_output2+0x1175/0x1480 net/ipv6/ip6_output.c:128 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip6_output+0x340/0x550 net/ipv6/ip6_output.c:247 NF_HOOK include/linux/netfilter.h:318 [inline] ndisc_send_skb+0xbce/0x1510 net/ipv6/ndisc.c:512 addrconf_rs_timer+0x369/0x670 net/ipv6/addrconf.c:4037 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:__wake_up_klogd+0xb6/0x110 kernel/printk/printk.c:4531 Code: c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 29 27 85 00 48 c7 c7 88 72 6e 92 48 03 3b e8 da 31 2e 00 01 00 00 00 e8 00 5d ef ff 65 8b 1d 79 8b cd 10 31 ff 89 de e8 RSP: 0018:ffffc900057e7b28 EFLAGS: 00010246 RAX: ffffffff81ced701 RBX: ffffffff8d92cdd8 RCX: 0000000000080000 RDX: ffffc90004d12000 RSI: 00000000000085a9 RDI: 00000000000085aa RBP: 0000000000000001 R08: ffffc900057e7a87 R09: 1ffff92000afcf50 R10: dffffc0000000000 R11: fffff52000afcf51 R12: 0000000000000000 R13: 000000000000006c R14: 0000000000000000 R15: 1ffff92000afcf6c vprintk_emit+0x4fc/0x590 kernel/printk/printk.c:-1 _printk+0xcf/0x120 kernel/printk/printk.c:2448 udplitev6_sk_init+0x44/0x50 net/ipv6/udplite.c:20 inet6_create+0xef4/0x1260 net/ipv6/af_inet6.c:259 __sock_create+0x4b3/0x9f0 net/socket.c:1605 sock_create net/socket.c:1663 [inline] __sys_socket_create net/socket.c:1700 [inline] __sys_socket+0xd7/0x1b0 net/socket.c:1747 __do_sys_socket net/socket.c:1761 [inline] __se_sys_socket net/socket.c:1759 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1759 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: 0033:0x7efd0bb8f6c9 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:00007efd0c9f1038 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007efd0bde5fa0 RCX: 00007efd0bb8f6c9 RDX: 0000000000000088 RSI: 0000000000000002 RDI: 000000000000000a RBP: 00007efd0bc11f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007efd0bde6038 R14: 00007efd0bde5fa0 R15: 00007ffcd18db1f8 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 5824 Comm: kworker/u9:2 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:lookup_chain_cache kernel/locking/lockdep.c:3801 [inline] RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:3821 [inline] RIP: 0010:validate_chain+0xa4/0x2140 kernel/locking/lockdep.c:3876 Code: c6 ca c8 7e 8d e8 3c 87 e5 ff 90 0f 0b 90 90 90 48 bb eb 83 b5 80 46 86 c8 61 49 0f af df 48 c1 eb 2d 48 8b 04 dd 60 e3 31 93 <48> 85 c0 0f 94 c1 48 83 c0 f8 0f 94 c2 08 ca 0f 84 24 01 00 00 e8 RSP: 0000:ffffc900000079b8 EFLAGS: 00000006 RAX: ffffffff93768878 RBX: 00000000000171dd RCX: 0000000000040000 RDX: 0000000000000000 RSI: ffff888025204828 RDI: ffff888025203c80 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8492ea1a R10: ffffc90000007cb0 R11: fffff52000000f98 R12: 0000000000000000 R13: ffff8880252047b0 R14: ffff888025204828 R15: 07b24d8723fa41a2 FS: 0000000000000000(0000) GS:ffff88812613d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fcf7f3e87d8 CR3: 00000000284cc000 CR4: 00000000003526f0 Call Trace: __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xa7/0xf0 kernel/locking/spinlock.c:162 debug_object_deactivate+0x9a/0x250 lib/debugobjects.c:873 debug_hrtimer_deactivate kernel/time/hrtimer.c:443 [inline] debug_deactivate+0x1d/0x200 kernel/time/hrtimer.c:483 __run_hrtimer kernel/time/hrtimer.c:1745 [inline] __hrtimer_run_queues+0x2b0/0xc60 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 d2 ed 1f 00 fb eb 44 e8 ca ed 1f 00 e8 45 29 a6 09 4d 85 f6 74 94 e8 bb ed 1f 00 fb 48 c7 c7 00 16 f3 8d <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 0b 39 RSP: 0000:ffffc900041cf700 EFLAGS: 00000293 RAX: ffffffff81a028d5 RBX: ffffffff81a0272e RCX: ffff888025203c80 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8df31600 RBP: ffffc900041cf810 R08: ffffffff8f7cdc77 R09: 1ffffffff1ef9b8e R10: dffffc0000000000 R11: fffffbfff1ef9b8f R12: 0000000000000000 R13: 000000000000002a R14: 0000000000000200 R15: 1ffff92000839ee4 _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