watchdog: BUG: soft lockup - CPU#1 stuck for 23s! [aoe_tx0:2252] Modules linked in: irq event stamp: 46302477 hardirqs last enabled at (46302476): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (46302476): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (46302477): [] __el1_irq arch/arm64/kernel/entry-common.c:499 [inline] hardirqs last disabled at (46302477): [] el1_interrupt+0x24/0x68 arch/arm64/kernel/entry-common.c:517 softirqs last enabled at (1006): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (1010): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 CPU: 1 PID: 2252 Comm: aoe_tx0 Not tainted 6.8.0-rc3-syzkaller-00010-gf735966ee23c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 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 : ffff80009c917800 x29: ffff80009c917800 x28: ffff0000cf02d1b0 x27: ffff0000cf02d140 x26: ffff0000dbd16cc8 x25: ffff0000cbe28020 x24: 0000000000000001 x23: 0000000000000000 x22: 0000000000000000 x21: dfff800000000000 x20: ffff8000937314c0 x19: 0000000000000000 x18: ffff80009c9174c0 x17: 000000000001965f x16: ffff80008031fff4 x15: 0000000000000001 x14: 1ffff000126e6298 x13: 0000000000000000 x12: 0000000000000003 x11: 0000000000000202 x10: 0000000000000003 x9 : 0000000000000000 x8 : 00000000000000c0 x7 : ffff800083c4bfcc x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000002 x1 : ffff80008aecd8e0 x0 : ffff80012545b000 Call trace: __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:176 [inline] arch_local_irq_restore arch/arm64/include/asm/irqflags.h:196 [inline] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:194 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] uart_port_unlock_irqrestore include/linux/serial_core.h:667 [inline] uart_write_room+0x140/0x2d0 drivers/tty/serial/serial_core.c:629 tty_write_room+0x6c/0x8c drivers/tty/tty_ioctl.c:69 handle_tx+0x120/0x604 drivers/net/caif/caif_serial.c:226 caif_xmit+0x108/0x150 drivers/net/caif/caif_serial.c:282 __netdev_start_xmit include/linux/netdevice.h:4989 [inline] netdev_start_xmit include/linux/netdevice.h:5003 [inline] xmit_one net/core/dev.c:3547 [inline] dev_hard_start_xmit+0x240/0x8ac net/core/dev.c:3563 __dev_queue_xmit+0x15b0/0x329c net/core/dev.c:4351 dev_queue_xmit include/linux/netdevice.h:3171 [inline] tx+0x90/0x138 drivers/block/aoe/aoenet.c:62 kthread+0x1ac/0x374 drivers/block/aoe/aoecmd.c:1229 kthread+0x288/0x310 kernel/kthread.c:388 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 6182 Comm: kworker/0:3 Not tainted 6.8.0-rc3-syzkaller-00010-gf735966ee23c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Workqueue: events ser_release pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : queued_spin_lock_slowpath+0x15c/0xcf8 kernel/locking/qspinlock.c:383 lr : queued_spin_lock_slowpath+0x168/0xcf8 kernel/locking/qspinlock.c:383 sp : ffff800097a47560 x29: ffff800097a47600 x28: 1fffe0001b475818 x27: 1ffff00012f48eb8 x26: dfff800000000000 x25: 1fffe0001b47581a x24: ffff800097a47580 x23: ffff800097a475c0 x22: ffff700012f48eb0 x21: 0000000000000001 x20: 0000000000000001 x19: ffff0000da3ac0c0 x18: ffff800097a47420 x17: 000000000001974c x16: ffff8000809face8 x15: 0000000000000001 x14: 1fffe0001b475818 x13: 0000000000000000 x12: 0000000000000000 x11: ffff60001b475819 x10: 1fffe0001b475818 x9 : 0000000000000000 x8 : 0000000000000001 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000020 x4 : 0000000000000000 x3 : ffff80008ae57cb4 x2 : 0000000000000000 x1 : 0000000000000001 x0 : 0000000000000001 Call trace: __cmpwait_case_8 arch/arm64/include/asm/cmpxchg.h:229 [inline] __cmpwait arch/arm64/include/asm/cmpxchg.h:257 [inline] queued_spin_lock_slowpath+0x15c/0xcf8 kernel/locking/qspinlock.c:383 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock+0x320/0x348 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:4452 [inline] netif_freeze_queues net/sched/sch_generic.c:459 [inline] netif_tx_lock+0x9c/0x1d8 net/sched/sch_generic.c:468 netif_tx_lock_bh include/linux/netdevice.h:4536 [inline] dev_watchdog_down net/sched/sch_generic.c:564 [inline] dev_deactivate_many+0x274/0xa8c net/sched/sch_generic.c:1352 __dev_close_many+0x270/0x3c8 net/core/dev.c:1517 dev_close_many+0x1e0/0x474 net/core/dev.c:1555 dev_close+0x174/0x250 net/core/dev.c:1581 ser_release+0x188/0x238 drivers/net/caif/caif_serial.c:309 process_one_work+0x694/0x1204 kernel/workqueue.c:2633 process_scheduled_works kernel/workqueue.c:2706 [inline] worker_thread+0x938/0xef4 kernel/workqueue.c:2787 kthread+0x288/0x310 kernel/kthread.c:388 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860