watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [aoe_tx0:2285] Modules linked in: irq event stamp: 41603377 hardirqs last enabled at (41603376): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (41603376): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (41603377): [] __el1_irq arch/arm64/kernel/entry-common.c:533 [inline] hardirqs last disabled at (41603377): [] el1_interrupt+0x24/0x68 arch/arm64/kernel/entry-common.c:551 softirqs last enabled at (3236): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (3240): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 CPU: 0 PID: 2285 Comm: aoe_tx0 Not tainted 6.9.0-rc4-syzkaller-00050-g6a71d2909427 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 pstate: 80401005 (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 : ffff80009ce277e0 x29: ffff80009ce277e0 x28: ffff0000d5b012f0 x27: ffff0000d5b01280 x26: ffff0000c8860c30 x25: ffff0000d7b52020 x24: dfff800000000000 x23: ffff0000c8860fd0 x22: 0000000000000000 x21: ffff0000e1bed8b0 x20: ffff8000939e92c0 x19: 0000000000000000 x18: ffff80009ce274c0 x17: 000000000001a85c x16: ffff800080333fec x15: 0000000000000001 x14: 1ffff0001273d258 x13: 0000000000000000 x12: 0000000000000003 x11: 0000000000000202 x10: 0000000000000003 x9 : 0000000000000000 x8 : 00000000000000c0 x7 : ffff800083c6135c x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000002 x1 : ffff80008afdfb40 x0 : ffff800124ff9000 Call trace: __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:175 [inline] arch_local_irq_restore arch/arm64/include/asm/irqflags.h:195 [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:670 [inline] uart_write+0x33c/0x594 drivers/tty/serial/serial_core.c:598 handle_tx+0x200/0x604 drivers/net/caif/caif_serial.c:236 caif_xmit+0x108/0x150 drivers/net/caif/caif_serial.c:282 __netdev_start_xmit include/linux/netdevice.h:4903 [inline] netdev_start_xmit include/linux/netdevice.h:4917 [inline] xmit_one net/core/dev.c:3531 [inline] dev_hard_start_xmit+0x27c/0x938 net/core/dev.c:3547 __dev_queue_xmit+0x15c8/0x32c8 net/core/dev.c:4335 dev_queue_xmit include/linux/netdevice.h:3091 [inline] tx+0x9c/0x1cc 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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 6263 Comm: kworker/1:4 Not tainted 6.9.0-rc4-syzkaller-00050-g6a71d2909427 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Workqueue: events ser_release pstate: 00401005 (nzcv daif +PAN -UAO -TCO -DIT +SSBS BTYPE=--) pc : queued_spin_lock_slowpath+0x15c/0xd38 kernel/locking/qspinlock.c:383 lr : queued_spin_lock_slowpath+0x168/0xd38 kernel/locking/qspinlock.c:383 sp : ffff800098d07520 x29: ffff800098d075c0 x28: 1fffe00019fe1118 x27: 1ffff000131a0eb0 x26: dfff800000000000 x25: 1fffe00019fe111a x24: ffff800098d07540 x23: ffff800098d07580 x22: ffff7000131a0ea8 x21: 0000000000000001 x20: 0000000000000001 x19: ffff0000cff088c0 x18: 0000000000000000 x17: 0000000000000000 x16: ffff800080a4cd48 x15: 0000000000000001 x14: 1fffe00019fe1118 x13: 0000000000000000 x12: 0000000000000000 x11: ffff600019fe1119 x10: 1fffe00019fe1118 x9 : 0000000000000000 x8 : 0000000000000001 x7 : ffff8000891d2618 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008af65f0c 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/0xd38 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:4371 [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:4455 [inline] dev_watchdog_down net/sched/sch_generic.c:565 [inline] dev_deactivate_many+0x274/0xa8c net/sched/sch_generic.c:1353 __dev_close_many+0x270/0x3c8 net/core/dev.c:1501 dev_close_many+0x1e0/0x474 net/core/dev.c:1539 dev_close+0x174/0x250 net/core/dev.c:1565 ser_release+0x188/0x238 drivers/net/caif/caif_serial.c:309 process_one_work+0x7b8/0x15d4 kernel/workqueue.c:3254 process_scheduled_works kernel/workqueue.c:3335 [inline] worker_thread+0x938/0xef4 kernel/workqueue.c:3416 kthread+0x288/0x310 kernel/kthread.c:388 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860