watchdog: BUG: soft lockup - CPU#0 stuck for 144s! [syz.1.1394:13411] Modules linked in: irq event stamp: 11701777 hardirqs last enabled at (11701776): [] irqentry_exit+0x59c/0x620 kernel/entry/common.c:219 hardirqs last disabled at (11701777): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (11464156): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (11464156): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (11464156): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (11464159): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (11464159): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (11464159): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 13411 Comm: syz.1.1394 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:__rcu_read_unlock+0xa/0xe0 kernel/rcu/tree_plugin.h:431 Code: dc 48 89 df e8 c7 64 82 00 eb d2 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 41 55 <41> 54 53 49 bf 00 00 00 00 00 fc ff df 65 48 8b 3d 39 51 48 11 48 RSP: 0018:ffffc900000074b8 EFLAGS: 00000286 RAX: 3755047d58d52c00 RBX: ffffffff90903701 RCX: 0000000000000102 RDX: 0000000000000001 RSI: ffffffff8df3426e RDI: ffffffff8c073980 RBP: dffffc0000000000 R08: ffffc90000007938 R09: 0000000000000000 R10: ffffc900000075f8 R11: fffff52000000ec1 R12: ffffc90000007948 R13: ffffc90000000000 R14: ffffc900000075a8 R15: ffffffff81759195 FS: 00007f1aa00d86c0(0000) GS:ffff8881256f5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd59a304a8 CR3: 000000002f82a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: rcu_read_unlock include/linux/rcupdate.h:899 [inline] class_rcu_destructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0x1aaf/0x23c0 arch/x86/kernel/unwind_orc.c:695 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2540 [inline] slab_free mm/slub.c:6674 [inline] kmem_cache_free+0x195/0x610 mm/slub.c:6785 skb_kfree_head net/core/skbuff.c:1066 [inline] skb_free_head net/core/skbuff.c:1080 [inline] skb_release_data+0x688/0x8e0 net/core/skbuff.c:1107 skb_release_all net/core/skbuff.c:1182 [inline] napi_consume_skb+0x1d8/0x290 net/core/skbuff.c:1518 __free_old_xmit+0x2cd/0x680 drivers/net/virtio_net.c:-1 virtnet_free_old_xmit drivers/net/virtio_net.c:636 [inline] free_old_xmit drivers/net/virtio_net.c:1081 [inline] virtnet_poll_tx+0x457/0x16a0 drivers/net/virtio_net.c:3230 __napi_poll+0xae/0x340 net/core/dev.c:7681 napi_poll net/core/dev.c:7744 [inline] net_rx_action+0x627/0xf70 net/core/dev.c:7896 handle_softirqs+0x22a/0x7c0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/0x150 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+0x48/0xa0 kernel/sched/core.c:7194 Code: 49 be 00 00 00 00 00 fc ff df eb 09 48 f7 03 10 00 00 00 74 53 bf 01 00 00 00 e8 b3 9c fa f5 e8 ae 30 34 f6 fb bf 01 00 00 00 43 a9 ff ff 9c 58 fa a9 00 02 00 00 74 05 e8 34 32 34 f6 bf 01 RSP: 0018:ffffc90002f26ef0 EFLAGS: 00000202 RAX: 0000000000127d7f RBX: 0000000000000000 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8dcc9112 RDI: 0000000000000001 RBP: 0000000000000000 R08: ffffffff8fef1a77 R09: 1ffffffff1fde34e R10: dffffc0000000000 R11: fffffbfff1fde34f R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 irqentry_exit+0x597/0x620 kernel/entry/common.c:216 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:variable_test_bit arch/x86/include/asm/bitops.h:-1 [inline] RIP: 0010:arch_test_bit arch/x86/include/asm/bitops.h:233 [inline] RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:142 [inline] RIP: 0010:cpumask_test_cpu include/linux/cpumask.h:649 [inline] RIP: 0010:cpu_online include/linux/cpumask.h:1231 [inline] RIP: 0010:__do_trace_lock_acquire include/trace/events/lock.h:24 [inline] RIP: 0010:trace_lock_acquire include/trace/events/lock.h:24 [inline] RIP: 0010:lock_acquire+0x286/0x330 kernel/locking/lockdep.c:5831 Code: 24 20 4c 89 7c 24 28 4c 89 74 24 10 89 5c 24 08 65 8b 05 e1 60 52 11 83 f8 08 0f 83 a9 00 00 00 89 c0 48 0f a3 05 0a cb 4e 0e <8b> 5c 24 08 4c 8b 74 24 10 4c 8b 7c 24 28 4c 8b 64 24 20 48 8b ac RSP: 0018:ffffc90002f27018 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000002 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e55a360 RBP: ffffffff81759195 R08: 0000000000000000 R09: 0000000000000000 R10: ffffc90002f271e8 R11: fffff520005e4e49 R12: 0000000000000002 R13: ffffffff8e55a360 R14: 0000000000000000 R15: 0000000000000000 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+0xc2/0x23c0 arch/x86/kernel/unwind_orc.c:495 __unwind_start+0x5b8/0x760 arch/x86/kernel/unwind_orc.c:773 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0xe3/0x150 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5657 [inline] __kvmalloc_node_noprof+0x59a/0x8d0 mm/slub.c:7140 kvmalloc_array_node_noprof include/linux/slab.h:1122 [inline] bpf_check+0x1046/0x1c4c0 kernel/bpf/verifier.c:25195 bpf_prog_load+0x1484/0x1ae0 kernel/bpf/syscall.c:3088 __sys_bpf+0x570/0x920 kernel/bpf/syscall.c:6164 __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+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1a9f19aeb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1aa00d8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f1a9f416090 RCX: 00007f1a9f19aeb9 RDX: 0000000000000094 RSI: 0000200000000440 RDI: 0000000000000005 RBP: 00007f1a9f208c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f1a9f416128 R14: 00007f1a9f416090 R15: 00007ffcdad7c088 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 13423 Comm: kworker/u9:1 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 Workqueue: hci0 hci_cmd_timeout RIP: 0010:do_raw_spin_unlock+0x5/0x210 kernel/locking/spinlock_debug.c:139 Code: c1 03 38 c1 0f 8c 65 ff ff ff e8 56 d2 8b 00 e9 5b ff ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 55 <41> 57 41 56 41 55 41 54 53 48 89 fb 49 bc 00 00 00 00 00 fc ff df RSP: 0018:ffffc90005047580 EFLAGS: 00000082 RAX: 87f69f30afb11600 RBX: ffffffff8e54c6a0 RCX: 0000000080000002 RDX: 0000000000000004 RSI: ffffffff8df3426e RDI: ffffffff8e54c6a0 RBP: ffffc900050476b0 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff52000a08ea4 R12: dffffc0000000000 R13: 0000000000000001 R14: 0000000000000001 R15: ffffffff8edee980 FS: 0000000000000000(0000) GS:ffff8881257f5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555556b3f4e8 CR3: 000000003496c000 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:142 [inline] _raw_spin_unlock+0x1e/0x50 kernel/locking/spinlock.c:186 console_lock_spinning_enable kernel/printk/printk.c:1896 [inline] console_emit_next_record kernel/printk/printk.c:3123 [inline] console_flush_one_record kernel/printk/printk.c:3215 [inline] console_flush_all+0x69a/0xb20 kernel/printk/printk.c:3289 __console_flush_and_unlock kernel/printk/printk.c:3319 [inline] console_unlock+0xd1/0x1c0 kernel/printk/printk.c:3359 vprintk_emit+0x485/0x560 kernel/printk/printk.c:2426 _printk+0xdd/0x130 kernel/printk/printk.c:2451 bt_err+0x121/0x180 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+0xaec/0x17a0 kernel/workqueue.c:3340 worker_thread+0xda6/0x1360 kernel/workqueue.c:3421 kthread+0x726/0x8b0 kernel/kthread.c:463 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246