watchdog: BUG: soft lockup - CPU#1 stuck for 23s! [aoe_tx0:2451] Modules linked in: irq event stamp: 69118109 hardirqs last enabled at (69118108): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (69118108): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (69118109): [] enter_from_kernel_mode+0x14/0x34 arch/arm64/kernel/entry-common.c:42 softirqs last enabled at (1440): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (1444): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 CPU: 1 UID: 0 PID: 2451 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 : ffff8000a25976c0 x29: ffff8000a25976c0 x28: ffff0000d41f11b0 x27: 0000000000000000 x26: ffff0000d41f1140 x25: ffff0000f477e238 x24: dfff800000000000 x23: 0000000000000003 x22: 0000000000000000 x21: ffff8000911b18c0 x20: ffff8000976d7f60 x19: 0000000000000000 x18: 00000000ffffffff x17: ffff800093325000 x16: ffff80008052bd88 x15: 0000000000000001 x14: 1ffff00012edafec x13: 0000000000000000 x12: 0000000000000000 x11: ffff800093124c88 x10: 0000000000000003 x9 : 0000000000000000 x8 : 00000000000000c0 x7 : ffff800083b31bc4 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000010 x2 : 0000000000000002 x1 : ffff80008eb9b3b1 x0 : ffff80010c9ee000 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: 8488 Comm: syz-executor 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 : preempt_count+0x4/0x68 arch/arm64/include/asm/preempt.h:11 lr : check_preemption_disabled+0x30/0xe4 lib/smp_processor_id.c:16 sp : ffff8000a1157090 x29: ffff8000a1157090 x28: ffff80008f8c2000 x27: 00000000ffffffff x26: 00000000000035fa x25: 00000000001535fa x24: 0000000000000001 x23: ffff0000d7c60000 x22: ffff80008b3fb300 x21: ffff80008b3fb340 x20: a1bf80008adfe3bc x19: 0000000000000000 x18: 0000000000000000 x17: ffff0001fea8c870 x16: ffff800082dee3c0 x15: 0000000000000001 x14: 1fffe0001811b5f9 x13: 0000000000000000 x12: 0000000000000000 x11: ffff60001811b5fa x10: ffff80008f59e768 x9 : 0000000000000003 x8 : 0000000000000002 x7 : ffff800080d2e118 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800080d2cc94 x2 : 0000000000000001 x1 : ffff80008b3fb340 x0 : ffff80008b3fb300 Call trace: preempt_count+0x4/0x68 arch/arm64/include/asm/preempt.h:11 (P) 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+0x30/0x40 include/linux/rcupdate.h:341 rcu_read_unlock include/linux/rcupdate.h:897 [inline] page_table_check_clear+0x500/0x570 mm/page_table_check.c:89 __page_table_check_pte_clear+0xa0/0xc0 mm/page_table_check.c:154 page_table_check_pte_clear include/linux/page_table_check.h:51 [inline] __ptep_get_and_clear_anysz arch/arm64/include/asm/pgtable.h:1380 [inline] __ptep_get_and_clear arch/arm64/include/asm/pgtable.h:1400 [inline] __get_and_clear_full_ptes arch/arm64/include/asm/pgtable.h:1421 [inline] get_and_clear_full_ptes arch/arm64/include/asm/pgtable.h:1836 [inline] zap_present_folio_ptes mm/memory.c:1628 [inline] zap_present_ptes mm/memory.c:1710 [inline] do_zap_pte_range mm/memory.c:1811 [inline] zap_pte_range mm/memory.c:1855 [inline] zap_pmd_range mm/memory.c:1947 [inline] zap_pud_range mm/memory.c:1976 [inline] zap_p4d_range mm/memory.c:1997 [inline] unmap_page_range+0x2768/0x3170 mm/memory.c:2018 unmap_single_vma mm/memory.c:2061 [inline] unmap_vmas+0x264/0x3d4 mm/memory.c:2105 exit_mmap+0x1b4/0xab0 mm/mmap.c:1280 __mmput+0xec/0x3fc kernel/fork.c:1133 mmput+0x70/0xac kernel/fork.c:1156 exit_mm+0x13c/0x200 kernel/exit.c:582 do_exit+0x4bc/0x1a14 kernel/exit.c:954 do_group_exit+0x194/0x22c kernel/exit.c:1107 get_signal+0x11dc/0x12f8 kernel/signal.c:3034 arch_do_signal_or_restart+0x274/0x4414 arch/arm64/kernel/signal.c:1619 exit_to_user_mode_loop+0x7c/0x178 kernel/entry/common.c:40 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:81 [inline] el0_svc+0x170/0x254 arch/arm64/kernel/entry-common.c:725 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596