watchdog: BUG: soft lockup - CPU#1 stuck for 26s! [aoe_tx0:2467] Modules linked in: irq event stamp: 76224221 hardirqs last enabled at (76224220): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (76224220): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (76224221): [] enter_from_kernel_mode+0x14/0x34 arch/arm64/kernel/entry-common.c:42 softirqs last enabled at (1334): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (1338): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 CPU: 1 UID: 0 PID: 2467 Comm: aoe_tx0 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP 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 : ffff8000a2157700 x29: ffff8000a2157700 x28: ffff0000f4b5a7f0 x27: 0000000000000000 x26: ffff0000f4b5a780 x25: ffff0000df01c238 x24: dfff800000000000 x23: 0000000000000003 x22: 0000000000000000 x21: ffff8000914d0160 x20: ffff80009794c8e0 x19: 0000000000000000 x18: 00000000ffffffff x17: ffff800093598000 x16: ffff80008053826c x15: 0000000000000001 x14: 1ffff00012f2991c x13: 0000000000000000 x12: 0000000000000000 x11: ffff800093397d48 x10: 0000000000000003 x9 : 0000000000000000 x8 : 00000000000000c0 x7 : ffff800083bc188c x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000010 x2 : 0000000000000002 x1 : ffff80008ee5b741 x0 : ffff80010c451000 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:5273 [inline] netdev_start_xmit include/linux/netdevice.h:5282 [inline] xmit_one net/core/dev.c:3853 [inline] dev_hard_start_xmit+0x298/0x890 net/core/dev.c:3869 __dev_queue_xmit+0x10c4/0x2a68 net/core/dev.c:4817 dev_queue_xmit include/linux/netdevice.h:3381 [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: 15 Comm: ksoftirqd/0 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP 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 : rcu_preempt_read_enter kernel/rcu/tree_plugin.h:391 [inline] pc : __rcu_read_lock+0x3c/0x84 kernel/rcu/tree_plugin.h:414 lr : rcu_read_lock include/linux/rcupdate.h:865 [inline] lr : net_generic+0x24/0x240 include/net/netns/generic.h:45 sp : ffff800097d26700 x29: ffff800097d26710 x28: ffff0000c1e25ba0 x27: 1fffe000183c4b70 x26: dfff800000000000 x25: ffff0000c7ab7e5c x24: 1ffff00012fa4d10 x23: ffff800097d26880 x22: 1fffe00018f56fcb x21: ffff0000c7ab6c10 x20: ffff0000dd734b80 x19: 000000000000004b x18: 1fffe0003377d090 x17: 0000000000020010 x16: ffff8000805378ac x15: 0000000000000001 x14: 0000000000000000 x13: 0000000000000003 x12: 0000000000ff0100 x11: ffff0000c1a63900 x10: 0000000000000007 x9 : 0000000000000000 x8 : ffff0000c1a63d44 x7 : ffff80008a004fa0 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000010 x2 : ffff800097d26860 x1 : 000000000000004b x0 : ffff0000dd734b80 Call trace: rcu_preempt_read_enter kernel/rcu/tree_plugin.h:391 [inline] (P) __rcu_read_lock+0x3c/0x84 kernel/rcu/tree_plugin.h:414 (P) rcu_read_lock include/linux/rcupdate.h:865 [inline] net_generic+0x24/0x240 include/net/netns/generic.h:45 is_vlan_ip net/bridge/br_netfilter_hooks.c:93 [inline] br_nf_post_routing+0x2ac/0xd14 net/bridge/br_netfilter_hooks.c:946 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline] nf_hook_slow+0xb4/0x21c net/netfilter/core.c:623 nf_hook include/linux/netfilter.h:273 [inline] NF_HOOK+0x1c4/0x354 include/linux/netfilter.h:316 br_forward_finish+0xd4/0x11c net/bridge/br_forward.c:66 br_nf_hook_thresh net/bridge/br_netfilter_hooks.c:-1 [inline] br_nf_forward_finish+0x7dc/0xba0 net/bridge/br_netfilter_hooks.c:662 NF_HOOK+0x56c/0x5fc include/linux/netfilter.h:318 br_nf_forward_ip+0x53c/0x69c net/bridge/br_netfilter_hooks.c:716 br_nf_forward+0x6c0/0x15e4 net/bridge/br_netfilter_hooks.c:773 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline] nf_hook_slow+0xb4/0x21c net/netfilter/core.c:623 nf_hook include/linux/netfilter.h:273 [inline] NF_HOOK+0x1c4/0x354 include/linux/netfilter.h:316 __br_forward+0x2d8/0x43c net/bridge/br_forward.c:115 br_flood+0x3dc/0x5e8 net/bridge/br_forward.c:-1 br_handle_frame_finish+0x1078/0x1658 net/bridge/br_input.c:229 br_nf_hook_thresh+0x344/0x3d8 net/bridge/br_netfilter_hooks.c:-1 br_nf_pre_routing_finish_ipv6+0x8bc/0xbe4 net/bridge/br_netfilter_ipv6.c:-1 NF_HOOK include/linux/netfilter.h:318 [inline] br_nf_pre_routing_ipv6+0x2c4/0x5ac net/bridge/br_netfilter_ipv6.c:184 br_nf_pre_routing+0x578/0x1130 net/bridge/br_netfilter_hooks.c:508 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline] nf_hook_bridge_pre net/bridge/br_input.c:291 [inline] br_handle_frame+0x79c/0x10ec net/bridge/br_input.c:442 __netif_receive_skb_core+0x840/0x2974 net/core/dev.c:6024 __netif_receive_skb_one_core net/core/dev.c:6135 [inline] __netif_receive_skb+0x78/0x2a8 net/core/dev.c:6250 process_backlog+0x608/0x10e8 net/core/dev.c:6602 __napi_poll+0xb0/0x310 net/core/dev.c:7666 napi_poll net/core/dev.c:7729 [inline] net_rx_action+0x548/0xcf0 net/core/dev.c:7881 handle_softirqs+0x31c/0xc88 kernel/softirq.c:622 run_ksoftirqd+0x70/0xc0 kernel/softirq.c:1063 smpboot_thread_fn+0x4d8/0x9cc kernel/smpboot.c:160 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844