watchdog: BUG: soft lockup - CPU#0 stuck for 26s! [aoe_tx0:2190] CPU#0 Utilization every 4s during lockup: #1: 100% system, 0% softirq, 0% hardirq, 0% idle #2: 100% system, 0% softirq, 0% hardirq, 0% idle #3: 100% system, 0% softirq, 0% hardirq, 0% idle #4: 100% system, 0% softirq, 1% hardirq, 0% idle #5: 100% system, 0% softirq, 0% hardirq, 0% idle Modules linked in: irq event stamp: 32313869 hardirqs last enabled at (32313868): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (32313868): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (32313869): [] __el1_irq arch/arm64/kernel/entry-common.c:580 [inline] hardirqs last disabled at (32313869): [] el1_interrupt+0x24/0x54 arch/arm64/kernel/entry-common.c:598 softirqs last enabled at (1864): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (1868): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 CPU: 0 UID: 0 PID: 2190 Comm: aoe_tx0 Not tainted 6.16.0-rc3-syzkaller-00346-gafa9a6f4f574 #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] pc : _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:194 lr : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] lr : _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194 sp : ffff80009fe676d0 x29: ffff80009fe676d0 x28: ffff0000c670d570 x27: 0000000000000000 x26: ffff0000c670d500 x25: ffff0000c670d5d8 x24: dfff800000000000 x23: 0000000000000003 x22: 0000000000000000 x21: ffff80008f8ced40 x20: ffff800095a571c0 x19: 0000000000000000 x18: 00000000ffffffff x17: ffff8000916ba000 x16: ffff8000804efed8 x15: 0000000000000001 x14: 1ffff00012b4ae38 x13: 0000000000000000 x12: 0000000000000000 x11: ffff8000914b9c08 x10: 0000000000000003 x9 : 0000000000000000 x8 : 00000000000000c0 x7 : ffff80008394f9d4 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000010 x2 : 0000000000000002 x1 : ffff80008d8b00c9 x0 : ffff80010fd35000 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) __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] (P) _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:194 (P) spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] uart_port_unlock_irqrestore include/linux/serial_core.h:788 [inline] uart_port_unlock_deref+0x108/0x2ec drivers/tty/serial/serial_core.c:91 uart_write+0xc4/0x130 drivers/tty/serial/serial_core.c:629 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:5215 [inline] netdev_start_xmit include/linux/netdevice.h:5224 [inline] xmit_one net/core/dev.c:3830 [inline] dev_hard_start_xmit+0x2b0/0x890 net/core/dev.c:3846 __dev_queue_xmit+0x15a4/0x31f0 net/core/dev.c:4713 dev_queue_xmit include/linux/netdevice.h:3355 [inline] tx+0x9c/0x1cc drivers/block/aoe/aoenet.c:62 kthread+0x164/0x354 drivers/block/aoe/aoecmd.c:1241 kthread+0x5ac/0x70c kernel/kthread.c:464 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:847 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 6658 Comm: kworker/1:4 Not tainted 6.16.0-rc3-syzkaller-00346-gafa9a6f4f574 #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: events ser_release pstate: 00400005 (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 : ffff80009b527440 x29: ffff80009b5274e0 x28: 1fffe00019f7a4a9 x27: 1fffe0001ae8f002 x26: ffff0000d7478000 x25: dfff800000000000 x24: ffff7000136a4e8c x23: 0000000000000000 x22: ffff0000d7478010 x21: ffff0000cfbd2548 x20: ffff0000cfbd2550 x19: ffff0000cfbd2540 x18: 0000000000000000 x17: 00000000ffff0000 x16: ffff8000804fc0a0 x15: 0000000000000001 x14: 1fffe00019f7a4a8 x13: 0000000000000000 x12: 0000000000000000 x11: ffff600019f7a4a9 x10: dfff800000000000 x9 : 0000000000000000 x8 : 0000000000000001 x7 : ffff800088874df4 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008a39cf4c 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:4651 [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:4736 [inline] netdev_watchdog_down net/sched/sch_generic.c:570 [inline] dev_deactivate_many+0x274/0xabc net/sched/sch_generic.c:1368 __dev_close_many+0x238/0x704 net/core/dev.c:1740 dev_close_many+0x1e8/0x448 net/core/dev.c:1781 netif_close+0x148/0x1f8 net/core/dev.c:1798 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:3238 process_scheduled_works kernel/workqueue.c:3321 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3402 kthread+0x5ac/0x70c kernel/kthread.c:464 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:847