watchdog: BUG: soft lockup - CPU#1 stuck for 27s! [kworker/u9:0:51] Modules linked in: irq event stamp: 66657 hardirqs last enabled at (66657): [] vprintk_store+0x924/0xb94 kernel/printk/printk.c:2385 hardirqs last disabled at (66656): [] vprintk_store+0x13c/0xb94 kernel/printk/printk.c:2287 softirqs last enabled at (66624): [] __alloc_skb+0x1c0/0x610 net/core/skbuff.c:698 softirqs last disabled at (66622): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (66622): [] __alloc_skb+0x1a8/0x610 net/core/skbuff.c:697 CPU: 1 UID: 0 PID: 51 Comm: kworker/u9:0 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 Workqueue: hci1 hci_cmd_sync_work pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : lock_acquire+0x168/0x320 arch/arm64/include/asm/irqflags.h:-1 lr : lockdep_recursion_finish kernel/locking/lockdep.c:470 [inline] lr : lock_acquire+0x148/0x320 kernel/locking/lockdep.c:5945 sp : ffff8000901e7890 x29: ffff8000901e78e0 x28: 0000000000000000 x27: ffff0000c34ed880 x26: ffff800088a222f8 x25: 0000000000000000 x24: 0000000000000001 x23: 0000000000000000 x22: ffff00010c7ecea0 x21: ffff800085bb2134 x20: 0000000000000000 x19: 0000000000000000 x18: 00000000ffffffff x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000130e73 x13: 0000000000000001 x12: 0000000000000003 x11: 0000000000000000 x10: 0000000000000003 x9 : 0000000000000000 x8 : 00000000000000c0 x7 : 0000000000000000 x6 : ffff800080483190 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000804930f0 x2 : 0000000100000001 x1 : ffff0000c34ed880 x0 : 0000000000000001 dump_backtrace(regs = 000000004ac5d14f tsk = 0000000000000000) Call trace: __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:175 [inline] (P) arch_local_irq_restore arch/arm64/include/asm/irqflags.h:195 [inline] (P) lock_acquire+0x168/0x320 kernel/locking/lockdep.c:5946 (P) __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x164/0x1078 kernel/locking/mutex.c:821 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:874 hci_cmd_sync_work+0x178/0x374 net/bluetooth/hci_sync.c:331 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3479 worker_thread+0x798/0xbd0 kernel/workqueue.c:3560 kthread+0x304/0x3d4 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:854 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline] NMI backtrace for cpu 0 skipped: idling at arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline] NMI backtrace for cpu 0 skipped: idling at default_idle_call+0xa0/0xb8 kernel/sched/idle.c:129 wireguard: wg0: Sending keepalive packet to peer 37 ([::1]:20002/0%0) wireguard: wg0: Sending keepalive packet to peer 61 ([::1]:20002/0%0) wireguard: wg0: Sending keepalive packet to peer 79 (127.0.0.1:20002) wireguard: wg0: Sending keepalive packet to peer 43 ([::1]:20002/0%0) ipv6_addr_label(addr=fc00:0000:0000:0000:0000:0000:0000:0001, type=0, ifindex=0) => 00000005 geneve1: no route to fc00:0000:0000:0000:0000:0000:0000:0001 wireguard: wg1: Handshake for peer 82 (127.0.0.1:20003) did not complete after 5 seconds, retrying (try 3) wireguard: wg2: Handshake for peer 84 (127.0.0.1:20002) did not complete after 5 seconds, retrying (try 3) Dropped {multi|broad}cast of type=[86dd] bridge0: port 2(bridge_slave_1) forward delay timer bridge0: port 2(bridge_slave_1) event 16 bridge0: br_fill_ifinfo event 16 port bridge_slave_1 master bridge0 bridge0: port 1(bridge_slave_0) forward delay timer bridge0: port 1(bridge_slave_0) event 16 bridge0: br_fill_ifinfo event 16 port bridge_slave_0 master bridge0 geneve1: no route to fc00:0000:0000:0000:0000:0000:0000:0001 kobject: 'brport' (00000000d957af98): kobject_cleanup, parent 0000000000000000 kobject: 'brport' (00000000d957af98): calling ktype release kobject: 'brport': free name kobject: 'brport' (000000001c321287): kobject_cleanup, parent 0000000000000000 kobject: 'brport' (000000001c321287): calling ktype release kobject: 'brport': free name net_ratelimit: 40 callbacks suppressed wireguard: wg0: Sending keepalive packet to peer 38 ([::1]:20003/0%0) wireguard: wg0: Sending keepalive packet to peer 43 ([::1]:20002/0%0) wireguard: wg0: Sending keepalive packet to peer 37 ([::1]:20002/0%0) wireguard: wg1: Sending keepalive packet to peer 46 (127.0.0.1:20003) wireguard: wg1: Sending keepalive packet to peer 40 (127.0.0.1:20003)