watchdog: BUG: soft lockup - CPU#1 stuck for 23s! [aoe_tx0:2454] Modules linked in: irq event stamp: 67315723 hardirqs last enabled at (67315722): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (67315722): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (67315723): [] enter_from_kernel_mode+0x14/0x34 arch/arm64/kernel/entry-common.c:42 softirqs last enabled at (1130): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (1134): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 CPU: 1 UID: 0 PID: 2454 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_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 : ffff8000a1b876c0 x29: ffff8000a1b876c0 x28: ffff0000c2363930 x27: 0000000000000000 x26: ffff0000c23638c0 x25: ffff0000c6ed8238 x24: dfff800000000000 x23: 0000000000000003 x22: 0000000000000000 x21: ffff8000911c1b40 x20: ffff8000976e7f80 x19: 0000000000000000 x18: 00000000ffffffff x17: ffff800093335000 x16: ffff80008052bd88 x15: 0000000000000001 x14: 1ffff00012edcff0 x13: 0000000000000000 x12: 0000000000000000 x11: ffff800093134c88 x10: 0000000000000003 x9 : 0000000000000000 x8 : 00000000000000c0 x7 : ffff800083b334e0 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000010 x2 : 0000000000000002 x1 : ffff80008ebabdfe x0 : ffff80010c9cc000 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:647 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: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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 6539 Comm: sshd-session 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 : __sanitizer_cov_trace_pc+0x80/0x84 kernel/kcov.c:235 lr : preempt_count+0x14/0x68 arch/arm64/include/asm/preempt.h:11 sp : ffff8000a2b26570 x29: ffff8000a2b26580 x28: ffff0000d4c28000 x27: dfff800000000000 x26: 0000000000000024 x25: 0000000004e01a40 x24: fffffdffc3e01a40 x23: ffff0000c8e43d80 x22: ffff80008b40b500 x21: ffff80008b40b540 x20: c7ae80008ae00784 x19: 0000000000000000 x18: 0000000000000000 x17: 0000000000fe010c x16: ffff800082defcc0 x15: ffff700014564d19 x14: 1ffff00014564d18 x13: 0000000000000000 x12: 0000000000000029 x11: 000000005ceedd4a x10: 0000000000ff0100 x9 : 0000000000000000 x8 : ffff0000c8e43d80 x7 : ffff8000805ed32c x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000002 x2 : 0000000000000008 x1 : ffff80008b40b540 x0 : ffff80008b40b500 Call trace: __sanitizer_cov_trace_pc+0x80/0x84 kernel/kcov.c:235 (P) check_preemption_disabled+0x30/0xe4 lib/smp_processor_id.c:16 debug_smp_processor_id+0x20/0x2c lib/smp_processor_id.c:58 rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline] rcu_is_watching+0x50/0x134 kernel/rcu/tree.c:751 trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x68/0x39c kernel/locking/lockdep.c:5879 rcu_lock_release+0x2c/0x38 include/linux/rcupdate.h:341 rcu_read_unlock_sched include/linux/rcupdate.h:979 [inline] pfn_valid+0x3e4/0x460 include/linux/mmzone.h:2197 dma_map_page_attrs+0x84/0xfc kernel/dma/mapping.c:201 dma_map_single_attrs include/linux/dma-mapping.h:502 [inline] gve_tx_add_skb_no_copy_dqo drivers/net/ethernet/google/gve/gve_tx_dqo.c:692 [inline] gve_tx_add_skb_dqo drivers/net/ethernet/google/gve/gve_tx_dqo.c:850 [inline] gve_try_tx_skb drivers/net/ethernet/google/gve/gve_tx_dqo.c:997 [inline] gve_tx_dqo+0x1dd0/0x4b30 drivers/net/ethernet/google/gve/gve_tx_dqo.c:1049 gve_start_xmit+0x8c/0xb4 drivers/net/ethernet/google/gve/gve_main.c:105 __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 sch_direct_xmit+0x1fc/0x468 net/sched/sch_generic.c:347 __dev_xmit_skb net/core/dev.c:4152 [inline] __dev_queue_xmit+0x1410/0x32a8 net/core/dev.c:4729 dev_queue_xmit include/linux/netdevice.h:3365 [inline] neigh_hh_output include/net/neighbour.h:531 [inline] neigh_output include/net/neighbour.h:545 [inline] ip_finish_output2+0xd80/0x1240 net/ipv4/ip_output.c:237 __ip_finish_output+0x1b0/0x44c net/ipv4/ip_output.c:-1 ip_finish_output+0x44/0x304 net/ipv4/ip_output.c:325 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip_output+0x284/0x3f8 net/ipv4/ip_output.c:438 dst_output include/net/dst.h:464 [inline] ip_local_out net/ipv4/ip_output.c:131 [inline] __ip_queue_xmit+0x8b8/0x1794 net/ipv4/ip_output.c:534 ip_queue_xmit+0x5c/0x7c net/ipv4/ip_output.c:548 __tcp_transmit_skb+0x1a34/0x3214 net/ipv4/tcp_output.c:1628 tcp_transmit_skb net/ipv4/tcp_output.c:1646 [inline] tcp_write_xmit+0x159c/0x52a4 net/ipv4/tcp_output.c:2999 __tcp_push_pending_frames+0x98/0x260 net/ipv4/tcp_output.c:3182 tcp_push+0x43c/0x640 net/ipv4/tcp.c:777 tcp_sendmsg_locked+0x3b84/0x47a8 net/ipv4/tcp.c:1376 tcp_sendmsg+0x40/0x64 net/ipv4/tcp.c:1413 inet_sendmsg+0x154/0x284 net/ipv4/af_inet.c:853 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] sock_write_iter+0x298/0x3d0 net/socket.c:1195 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x540/0xa3c fs/read_write.c:686 ksys_write+0x120/0x210 fs/read_write.c:738 __do_sys_write fs/read_write.c:749 [inline] __se_sys_write fs/read_write.c:746 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:746 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c 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:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596