watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [aoe_tx0:2415] Modules linked in: irq event stamp: 68974677 hardirqs last enabled at (68974676): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (68974676): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (68974677): [] __el1_irq arch/arm64/kernel/entry-common.c:650 [inline] hardirqs last disabled at (68974677): [] el1_interrupt+0x24/0x54 arch/arm64/kernel/entry-common.c:668 softirqs last enabled at (1104): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (1108): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 CPU: 0 UID: 0 PID: 2415 Comm: aoe_tx0 Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : _raw_spin_lock_irqsave+0x8/0x7c kernel/locking/spinlock.c:161 lr : uart_port_lock_irqsave include/linux/serial_core.h:717 [inline] lr : uart_port_ref_lock+0xe0/0x35c drivers/tty/serial/serial_core.c:83 sp : ffff8000a18976c0 x29: ffff8000a18976f0 x28: ffff0000d49e6570 x27: 0000000000000000 x26: ffff0000d49e6500 x25: 0000000000000001 x24: dfff800000000000 x23: 0000000000000002 x22: 0000000000000001 x21: ffff0000c8e10f84 x20: ffff8000a1897740 x19: ffff800097897d40 x18: 00000000ffffffff x17: ffff800093507000 x16: ffff8000805293e8 x15: 0000000000000001 x14: 1fffe000191c21f0 x13: 0000000000000000 x12: 0000000000000000 x11: ffff6000191c21f1 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : 0000000000000000 x7 : ffff800083e11828 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : ffff800083e11788 x2 : 0000000000000001 x1 : 0000000000000001 x0 : ffff800097897d40 Call trace: _raw_spin_lock_irqsave+0x8/0x7c kernel/locking/spinlock.c:161 (P) uart_write+0x70/0x130 drivers/tty/serial/serial_core.c:627 handle_tx+0x200/0x5fc drivers/net/caif/caif_serial.c:222 caif_xmit+0x108/0x150 drivers/net/caif/caif_serial.c:268 __netdev_start_xmit include/linux/netdevice.h:5219 [inline] netdev_start_xmit include/linux/netdevice.h:5228 [inline] xmit_one net/core/dev.c:3827 [inline] dev_hard_start_xmit+0x2b0/0x890 net/core/dev.c:3843 __dev_queue_xmit+0x1600/0x32a8 net/core/dev.c:4713 dev_queue_xmit include/linux/netdevice.h:3358 [inline] tx+0x9c/0x1cc drivers/block/aoe/aoenet.c:62 kthread+0x164/0x354 drivers/block/aoe/aoecmd.c:1241 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 6750 Comm: kworker/1:6 Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 Workqueue: events ser_release pstate: 03400005 (nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : queued_spin_lock_slowpath+0x138/0xaec kernel/locking/qspinlock.c:197 lr : queued_spin_lock_slowpath+0x144/0xaec kernel/locking/qspinlock.c:197 sp : ffff80009e067440 x29: ffff80009e0674e0 x28: 1fffe0001ed9cda9 x27: 1fffe00019f823d2 x26: ffff0000cfc11e80 x25: dfff800000000000 x24: ffff700013c0ce8c x23: 0000000000000000 x22: ffff0000cfc11e90 x21: ffff0000f6ce6d48 x20: ffff0000f6ce6d50 x19: ffff0000f6ce6d40 x18: 0000000000000000 x17: 0000000000000000 x16: ffff8000805354d8 x15: 0000000000000001 x14: 1fffe0001ed9cda8 x13: 0000000000000000 x12: 0000000000000000 x11: ffff60001ed9cda9 x10: dfff800000000000 x9 : 0000000000000000 x8 : 0000000000000001 x7 : ffff8000894fa224 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008b029af8 x2 : 0000000000000000 x1 : 0000000000000001 x0 : 0000000000000001 Call trace: __cmpwait_case_8 arch/arm64/include/asm/cmpxchg.h:229 [inline] (P) __cmpwait arch/arm64/include/asm/cmpxchg.h:257 [inline] (P) queued_spin_lock_slowpath+0x138/0xaec kernel/locking/qspinlock.c:197 (P) queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock+0x2a8/0x2cc kernel/locking/spinlock_debug.c:116 __raw_spin_lock include/linux/spinlock_api_smp.h:134 [inline] _raw_spin_lock+0x50/0x60 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] __netif_tx_lock include/linux/netdevice.h:4656 [inline] netif_freeze_queues net/sched/sch_generic.c:461 [inline] netif_tx_lock+0x9c/0x1d8 net/sched/sch_generic.c:470 netif_tx_lock_bh include/linux/netdevice.h:4741 [inline] netdev_watchdog_down net/sched/sch_generic.c:570 [inline] dev_deactivate_many+0x274/0xabc net/sched/sch_generic.c:1370 __dev_close_many+0x238/0x704 net/core/dev.c:1739 netif_close_many+0x1e8/0x448 net/core/dev.c:1780 netif_close+0x148/0x1f8 net/core/dev.c:1797 dev_close+0xf8/0x1e4 net/core/dev_api.c:220 ser_release+0x150/0x1ec drivers/net/caif/caif_serial.c:295 process_one_work+0x7e8/0x155c kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3400 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844