watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [aoe_tx0:2455] Modules linked in: irq event stamp: 58894035 hardirqs last enabled at (58894034): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (58894034): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (58894035): [] enter_from_kernel_mode+0x14/0x34 arch/arm64/kernel/entry-common.c:42 softirqs last enabled at (2536): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (2540): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 CPU: 0 UID: 0 PID: 2455 Comm: aoe_tx0 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : raw_atomic_try_cmpxchg include/linux/atomic/atomic-arch-fallback.h:2140 [inline] pc : raw_atomic_fetch_add_unless include/linux/atomic/atomic-arch-fallback.h:2431 [inline] pc : raw_atomic_add_unless include/linux/atomic/atomic-arch-fallback.h:2456 [inline] pc : atomic_add_unless include/linux/atomic/atomic-instrumented.h:1518 [inline] pc : uart_port_ref drivers/tty/serial/serial_core.c:67 [inline] pc : uart_port_ref_lock+0x74/0x35c drivers/tty/serial/serial_core.c:80 lr : __lse__cmpxchg_case_mb_32 arch/arm64/include/asm/atomic_lse.h:279 [inline] lr : __cmpxchg_case_mb_32 arch/arm64/include/asm/cmpxchg.h:128 [inline] lr : __cmpxchg_mb arch/arm64/include/asm/cmpxchg.h:171 [inline] lr : raw_atomic_cmpxchg include/linux/atomic/atomic-arch-fallback.h:2026 [inline] lr : raw_atomic_try_cmpxchg include/linux/atomic/atomic-arch-fallback.h:2139 [inline] lr : raw_atomic_fetch_add_unless include/linux/atomic/atomic-arch-fallback.h:2431 [inline] lr : raw_atomic_add_unless include/linux/atomic/atomic-arch-fallback.h:2456 [inline] lr : atomic_add_unless include/linux/atomic/atomic-instrumented.h:1518 [inline] lr : uart_port_ref drivers/tty/serial/serial_core.c:67 [inline] lr : uart_port_ref_lock+0x6c/0x35c drivers/tty/serial/serial_core.c:80 sp : ffff8000a2927710 x29: ffff8000a2927710 x28: ffff0000fa57cbb0 x27: 0000000000000000 x26: ffff0000fa57cb40 x25: 0000000000000001 x24: dfff800000000000 x23: 0000000000000002 x22: 0000000000000001 x21: ffff0000ca360f84 x20: ffff8000a2927760 x19: ffff0000ca360be8 x18: 00000000ffffffff x17: ffff800093325000 x16: ffff80008052bd88 x15: 0000000000000001 x14: 1fffe0001946c1f0 x13: 0000000000000000 x12: 0000000000000000 x11: ffff60001946c1f1 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : ffff0000ce341ec0 x7 : ffff800083b2f6bc x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : ffff800083b2f61c x2 : 0000000000000001 x1 : 0000000000000001 x0 : 0000000000000000 Call trace: __lse__cmpxchg_case_mb_32 arch/arm64/include/asm/atomic_lse.h:279 [inline] (P) __cmpxchg_case_mb_32 arch/arm64/include/asm/cmpxchg.h:128 [inline] (P) __cmpxchg_mb arch/arm64/include/asm/cmpxchg.h:171 [inline] (P) raw_atomic_cmpxchg include/linux/atomic/atomic-arch-fallback.h:2026 [inline] (P) raw_atomic_try_cmpxchg include/linux/atomic/atomic-arch-fallback.h:2139 [inline] (P) raw_atomic_fetch_add_unless include/linux/atomic/atomic-arch-fallback.h:2431 [inline] (P) raw_atomic_add_unless include/linux/atomic/atomic-arch-fallback.h:2456 [inline] (P) atomic_add_unless include/linux/atomic/atomic-instrumented.h:1518 [inline] (P) uart_port_ref drivers/tty/serial/serial_core.c:67 [inline] (P) uart_port_ref_lock+0x74/0x35c drivers/tty/serial/serial_core.c:80 (P) uart_write+0x70/0x130 drivers/tty/serial/serial_core.c:624 handle_tx+0x200/0x5fc drivers/net/caif/caif_serial.c:222 caif_xmit+0x108/0x150 drivers/net/caif/caif_serial.c:268 __netdev_start_xmit include/linux/netdevice.h:5248 [inline] netdev_start_xmit include/linux/netdevice.h:5257 [inline] xmit_one net/core/dev.c:3845 [inline] dev_hard_start_xmit+0x2b0/0x890 net/core/dev.c:3861 __dev_queue_xmit+0x1600/0x32a8 net/core/dev.c:4763 dev_queue_xmit include/linux/netdevice.h:3365 [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: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : arch_local_irq_enable+0x8/0xc arch/arm64/include/asm/irqflags.h:50 lr : default_idle_call+0xd0/0xfc kernel/sched/idle.c:129 sp : ffff800097af7d60 x29: ffff800097af7d60 x28: 0000000000000002 x27: dfff800000000000 x26: 1ffff00012f5efb4 x25: 0000000000000000 x24: 0000000000000000 x23: 1fffe00018343b88 x22: ffff80008f59e768 x21: 1ffff00011eb3ced x20: 0000000000000000 x19: ffff8000804cc384 x18: 1fffe000337db690 x17: ffff80008f59e000 x16: ffff8000804cbca8 x15: 0000000000000001 x14: 1fffe000337dd340 x13: 0000000000000000 x12: 0000000000000000 x11: ffff6000337dd341 x10: 0000000000000003 x9 : 0000000000000000 x8 : 00000000000cff83 x7 : ffff800080663c90 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : ffff80008adfb8f0 x2 : 0000000000000000 x1 : ffff80008eb9af9c x0 : ffff80010c9ee000 Call trace: __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline] (P) arch_local_irq_enable+0x8/0xc arch/arm64/include/asm/irqflags.h:48 (P) cpuidle_idle_call kernel/sched/idle.c:190 [inline] do_idle+0x1d8/0x454 kernel/sched/idle.c:330 cpu_startup_entry+0x5c/0x74 kernel/sched/idle.c:428 secondary_start_kernel+0x1bc/0x1e4 arch/arm64/kernel/smp.c:271 __secondary_switched+0xc0/0xc4 arch/arm64/kernel/head.S:401