watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [aoe_tx0:2412] Modules linked in: irq event stamp: 66145809 hardirqs last enabled at (66145808): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (66145808): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (66145809): [] __enter_from_kernel_mode arch/arm64/kernel/entry-common.c:43 [inline] hardirqs last disabled at (66145809): [] enter_from_kernel_mode+0x14/0x34 arch/arm64/kernel/entry-common.c:50 softirqs last enabled at (1174): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (1178): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 CPU: 0 UID: 0 PID: 2412 Comm: aoe_tx0 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 pstate: 83400005 (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 : ffff8000a25676c0 x29: ffff8000a25676c0 x28: ffff0000d8fc42f0 x27: 0000000000000000 x26: ffff0000d8fc4280 x25: ffff0000fda10238 x24: dfff800000000000 x23: 0000000000000003 x22: 0000000000000000 x21: ffff8000913b4600 x20: ffff8000978cae40 x19: 0000000000000000 x18: 00000000ffffffff x17: ffff80009353a000 x16: ffff80008052ac24 x15: 0000000000000001 x14: 1ffff00012f195c8 x13: 0000000000000000 x12: 0000000000000000 x11: ffff800093339c28 x10: 0000000000000003 x9 : 0000000000000000 x8 : 00000000000000c0 x7 : ffff800083e1c124 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000010 x2 : 0000000000000002 x1 : ffff80008edeef84 x0 : ffff80010c542000 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_room+0xa4/0x15c drivers/tty/serial/serial_core.c:650 tty_write_room+0x6c/0x8c drivers/tty/tty_ioctl.c:69 handle_tx+0x128/0x5fc 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:5222 [inline] netdev_start_xmit include/linux/netdevice.h:5231 [inline] xmit_one net/core/dev.c:3839 [inline] dev_hard_start_xmit+0x2b0/0x890 net/core/dev.c:3855 __dev_queue_xmit+0x1600/0x32a8 net/core/dev.c:4725 dev_queue_xmit include/linux/netdevice.h:3361 [inline] tx+0x9c/0x1cc drivers/block/aoe/aoenet.c:62 kthread+0x164/0x354 drivers/block/aoe/aoecmd.c:1241 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 6518 Comm: sshd-session Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline] pc : _raw_spin_unlock_irq+0x34/0x80 kernel/locking/spinlock.c:202 lr : __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline] lr : _raw_spin_unlock_irq+0x30/0x80 kernel/locking/spinlock.c:202 sp : ffff8000a5297840 x29: ffff8000a5297840 x28: dfff800000000000 x27: ffff0000ca46c028 x26: ffff700014a52f24 x25: ffff0000ca46bcc0 x24: 0000000000000000 x23: ffff0000ca46c038 x22: ffff0000cadb10f8 x21: ffff0000c80aa3b0 x20: ffff0000c80a9e80 x19: ffff0000ca46bed8 x18: 0000000000000000 x17: 0000000000000000 x16: ffff80008052ac24 x15: 0000000000000001 x14: 1fffe0001948d7db x13: 0000000000000000 x12: 0000000000000000 x11: ffff60001948d7dc x10: 0000000000000003 x9 : 0000000000000000 x8 : 0000000000001053 x7 : ffff8000803d258c x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000010 x2 : ffff8000a5297840 x1 : ffff80008edeef84 x0 : ffff80010c566000 Call trace: __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline] (P) arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline] (P) __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline] (P) _raw_spin_unlock_irq+0x34/0x80 kernel/locking/spinlock.c:202 (P) spin_unlock_irq include/linux/spinlock.h:401 [inline] write_sequnlock_irq include/linux/seqlock.h:943 [inline] wait_task_zombie kernel/exit.c:1242 [inline] wait_consider_task+0x12ec/0x25ac kernel/exit.c:1491 do_wait_thread kernel/exit.c:1554 [inline] __do_wait+0x144/0x668 kernel/exit.c:1672 do_wait+0x1ec/0x540 kernel/exit.c:1706 kernel_wait4+0x184/0x2e0 kernel/exit.c:1865 __do_sys_wait4 kernel/exit.c:1893 [inline] __se_sys_wait4 kernel/exit.c:1889 [inline] __arm64_sys_wait4+0x11c/0x2a0 kernel/exit.c:1889 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:763 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596