watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [aoe_tx0:2465] Modules linked in: irq event stamp: 70828717 hardirqs last enabled at (70828716): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (70828716): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (70828717): [] enter_from_kernel_mode+0x14/0x34 arch/arm64/kernel/entry-common.c:42 softirqs last enabled at (1472): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (1478): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 CPU: 0 UID: 0 PID: 2465 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 : ffff8000a0047700 x29: ffff8000a0047700 x28: ffff0000d39106b0 x27: 0000000000000000 x26: ffff0000d3910640 x25: ffff0000d9270238 x24: dfff800000000000 x23: 0000000000000003 x22: 0000000000000000 x21: ffff8000914d0520 x20: ffff80009794d920 x19: 0000000000000000 x18: 00000000ffffffff x17: ffff800093599000 x16: ffff8000805387e4 x15: 0000000000000001 x14: 1ffff00012f29b24 x13: 0000000000000000 x12: 0000000000000000 x11: ffff800093398d48 x10: 0000000000000003 x9 : 0000000000000000 x8 : 00000000000000c0 x7 : ffff800083bc3830 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000010 x2 : 0000000000000002 x1 : ffff80008ee5c07c x0 : ffff80010c42d000 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+0x1070/0x2a78 net/core/dev.c:4819 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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 6561 Comm: syz-executor 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_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline] pc : rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline] pc : rcu_is_watching+0x98/0x134 kernel/rcu/tree.c:751 lr : rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline] lr : rcu_is_watching+0x50/0x134 kernel/rcu/tree.c:751 sp : ffff80009c0e7390 x29: ffff80009c0e7390 x28: 0000000000001000 x27: 0000000000000000 x26: fffffdffc3886980 x25: 0000000000000000 x24: 0000000000000001 x23: 1ffff00011e2ed36 x22: dfff800000000000 x21: 1fffe0001914c001 x20: ffff00019bc1a9b8 x19: ffff0000c8a60008 x18: 0000000000000000 x17: ffff0001fea8d870 x16: ffff800082e5e68c x15: 0000000000000001 x14: 1ffff00012f163bb x13: 0000000000000000 x12: 0000000000000000 x11: 000000000af105ca x10: 0000000000000003 x9 : ffff80008f7c99b0 x8 : 0000000000000000 x7 : ffff800080ca5718 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000002 x2 : 0000000000000008 x1 : ffff80008b5a9ce0 x0 : 0000000000000001 Call trace: raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline] (P) rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline] (P) rcu_is_watching+0x98/0x134 kernel/rcu/tree.c:751 (P) rcu_read_unlock_sched include/linux/rcupdate.h:977 [inline] pfn_valid+0x19c/0x200 include/linux/mmzone.h:2193 lowmem_page_address include/linux/mm.h:2512 [inline] __kasan_poison_pages+0x40/0x90 mm/kasan/common.c:151 kasan_poison_pages include/linux/kasan.h:118 [inline] free_pages_prepare mm/page_alloc.c:1428 [inline] free_unref_folios+0x588/0x1434 mm/page_alloc.c:3000 folios_put_refs+0x61c/0x72c mm/swap.c:1002 free_pages_and_swap_cache+0x204/0x3a0 mm/swap_state.c:355 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] tlb_flush_mmu_free mm/mmu_gather.c:397 [inline] tlb_flush_mmu+0x14c/0x398 mm/mmu_gather.c:404 tlb_finish_mmu+0xc0/0x1e4 mm/mmu_gather.c:497 exit_mmap+0x34c/0xaac mm/mmap.c:1290 __mmput+0xec/0x3fc kernel/fork.c:1173 mmput+0x70/0xac kernel/fork.c:1196 exit_mm+0x13c/0x200 kernel/exit.c:581 do_exit+0x4c4/0x1a1c kernel/exit.c:959 do_group_exit+0x194/0x22c kernel/exit.c:1112 __do_sys_exit_group kernel/exit.c:1123 [inline] __se_sys_exit_group kernel/exit.c:1121 [inline] pid_child_should_wake+0x0/0x1dc kernel/exit.c:1121 __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/0x26c 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