watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [aoe_tx0:2386] Modules linked in: irq event stamp: 46551285 hardirqs last enabled at (46551284): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (46551284): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (46551285): [] __el1_irq arch/arm64/kernel/entry-common.c:557 [inline] hardirqs last disabled at (46551285): [] el1_interrupt+0x24/0x68 arch/arm64/kernel/entry-common.c:575 softirqs last enabled at (1306): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (1310): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 CPU: 0 UID: 0 PID: 2386 Comm: aoe_tx0 Not tainted 6.15.0-rc2-syzkaller-gc72692105976 #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 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 : ffff8000a1e67660 x29: ffff8000a1e67660 x28: ffff80008ff31000 x27: 0000000000000000 x26: 0000000000000000 x25: dfff800000000000 x24: 0000000000000000 x23: 0000000000000003 x22: 0000000000000000 x21: ffff800091a3f180 x20: ffff800097eb8a00 x19: 0000000000000000 x18: 0000000000000008 x17: 00000000fffffffa x16: ffff8000804841e8 x15: 0000000000000001 x14: 1ffff00012fd7140 x13: ffff8000a1e68000 x12: ffff8000a1e67670 x11: ffff8000a1e67690 x10: 0000000000000003 x9 : 0000000000000000 x8 : 00000000000000c0 x7 : ffff8000840dd620 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000002 x1 : ffff80008f63dd46 x0 : ffff800123873000 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:786 [inline] uart_write_room+0x320/0x71c drivers/tty/serial/serial_core.c:649 tty_write_room+0x6c/0x8c drivers/tty/tty_ioctl.c:69 handle_tx+0x120/0x604 drivers/net/caif/caif_serial.c:212 caif_xmit+0x108/0x150 drivers/net/caif/caif_serial.c:268 __netdev_start_xmit include/linux/netdevice.h:5203 [inline] netdev_start_xmit include/linux/netdevice.h:5212 [inline] xmit_one net/core/dev.c:3774 [inline] dev_hard_start_xmit+0x2c4/0x958 net/core/dev.c:3790 __dev_queue_xmit+0x1684/0x35b8 net/core/dev.c:4627 dev_queue_xmit include/linux/netdevice.h:3350 [inline] tx+0x9c/0x1cc drivers/block/aoe/aoenet.c:62 kthread+0x1b0/0x398 drivers/block/aoe/aoecmd.c:1237 kthread+0x674/0x7dc kernel/kthread.c:464 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 6535 Comm: kworker/1:7 Not tainted 6.15.0-rc2-syzkaller-gc72692105976 #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Workqueue: events ser_release pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : queued_spin_lock_slowpath+0x15c/0xd04 kernel/locking/qspinlock.c:197 lr : queued_spin_lock_slowpath+0x168/0xd04 kernel/locking/qspinlock.c:197 sp : ffff8000a0ed7360 x29: ffff8000a0ed7420 x28: 1fffe0001d059b28 x27: dfff800000000000 x26: 1ffff000141dae98 x25: ffff8000a0ed73a0 x24: dfff800000000000 x23: ffff8000a0ed73e0 x22: ffff7000141dae74 x21: 0000000000000001 x20: 1ffff000141dae7c x19: ffff0000e82cd940 x18: 1fffe000366e26b6 x17: 00000000fffffffa x16: ffff800080c24fe4 x15: 0000000000000001 x14: 1fffe0001d059b28 x13: 0000000000000000 x12: 0000000000000000 x11: ffff60001d059b29 x10: 1fffe0001d059b28 x9 : 0000000000000000 x8 : 0000000000000001 x7 : ffff800089c59508 x6 : 0000000000000000 x5 : 0000000000000020 x4 : ffff8000a0ed7320 x3 : ffff80008b9ae444 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+0x15c/0xd04 kernel/locking/qspinlock.c:197 (P) queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock+0x2ec/0x334 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:4641 [inline] netif_freeze_queues net/sched/sch_generic.c:460 [inline] netif_tx_lock+0x9c/0x1d8 net/sched/sch_generic.c:469 netif_tx_lock_bh include/linux/netdevice.h:4725 [inline] netdev_watchdog_down net/sched/sch_generic.c:569 [inline] dev_deactivate_many+0x2d0/0xb70 net/sched/sch_generic.c:1367 __dev_close_many+0x274/0x76c net/core/dev.c:1684 dev_close_many+0x1e0/0x474 net/core/dev.c:1725 netif_close+0x174/0x250 net/core/dev.c:1742 dev_close+0x104/0x1fc net/core/dev_api.c:219 ser_release+0x188/0x238 drivers/net/caif/caif_serial.c:295 process_one_work+0x810/0x1638 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x97c/0xf08 kernel/workqueue.c:3400 kthread+0x674/0x7dc kernel/kthread.c:464 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862