watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [aoe_tx0:2216] Modules linked in: irq event stamp: 38854853 hardirqs last enabled at (38854852): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (38854852): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (38854853): [] __el1_irq arch/arm64/kernel/entry-common.c:499 [inline] hardirqs last disabled at (38854853): [] el1_interrupt+0x24/0x68 arch/arm64/kernel/entry-common.c:517 softirqs last enabled at (18966): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (18970): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 CPU: 0 PID: 2216 Comm: aoe_tx0 Not tainted 6.6.0-rc7-syzkaller-g8de1e7afcc1c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 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 : ffff80009c5177f0 x29: ffff80009c5177f0 x28: ffff0000d6250e30 x27: ffff0000d6250dc0 x26: ffff0000c8cb0c30 x25: ffff0000f1d4e020 x24: dfff800000000000 x23: ffff0000c8cb0fd0 x22: 0000000000000000 x21: ffff0000c78ff6b0 x20: ffff800092b39c40 x19: 0000000000000000 x18: ffff80009c5174e0 x17: ffff80008e33d000 x16: ffff800080316308 x15: 0000000000000001 x14: 1ffff00012567388 x13: 0000000000000000 x12: 0000000000000003 x11: 0000000000000202 x10: 0000000000000003 x9 : 0000000000000000 x8 : 00000000000000c0 x7 : ffff800083801928 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000002 x1 : ffff80008a87dae0 x0 : ffff800125ee3000 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_write+0x33c/0x594 drivers/tty/serial/serial_core.c:601 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:4889 [inline] netdev_start_xmit include/linux/netdevice.h:4903 [inline] xmit_one net/core/dev.c:3573 [inline] dev_hard_start_xmit+0x240/0x8ac net/core/dev.c:3589 __dev_queue_xmit+0x1650/0x32c0 net/core/dev.c:4369 dev_queue_xmit include/linux/netdevice.h:3082 [inline] tx+0x90/0x134 drivers/block/aoe/aoenet.c:63 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:857 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 6671 Comm: kworker/1:2 Not tainted 6.6.0-rc7-syzkaller-g8de1e7afcc1c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 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 : ffff80009a767560 x29: ffff80009a767600 x28: 1fffe00018e74c18 x27: 1ffff000134eceb8 x26: dfff800000000000 x25: 1fffe00018e74c1a x24: ffff80009a767580 x23: ffff80009a7675c0 x22: ffff7000134eceb0 x21: 0000000000000001 x20: 0000000000000001 x19: ffff0000c73a60c0 x18: ffff80009a767440 x17: ffff80008e33d000 x16: ffff8000809c56f4 x15: 0000000000000001 x14: 1fffe00018e74c18 x13: 0000000000000000 x12: 0000000000000000 x11: ffff600018e74c19 x10: 1fffe00018e74c18 x9 : 0000000000000000 x8 : 0000000000000001 x7 : 0000000000000000 x6 : 0000000000000000 x5 : ffff800091a45868 x4 : 0000000000000008 x3 : ffff80008a8083ec 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:115 __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:4352 [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:4436 [inline] dev_watchdog_down net/sched/sch_generic.c:563 [inline] dev_deactivate_many+0x274/0xa8c net/sched/sch_generic.c:1348 __dev_close_many+0x26c/0x3c4 net/core/dev.c:1546 dev_close_many+0x1e0/0x470 net/core/dev.c:1584 dev_close+0x174/0x250 net/core/dev.c:1610 ser_release+0x188/0x238 drivers/net/caif/caif_serial.c:309 process_one_work+0x694/0x1204 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x938/0xef4 kernel/workqueue.c:2784 kthread+0x288/0x310 kernel/kthread.c:388 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:857