watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [aoe_tx0:2413] Modules linked in: irq event stamp: 68040985 hardirqs last enabled at (68040984): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (68040984): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (68040985): [] __enter_from_kernel_mode arch/arm64/kernel/entry-common.c:43 [inline] hardirqs last disabled at (68040985): [] enter_from_kernel_mode+0x14/0x34 arch/arm64/kernel/entry-common.c:50 softirqs last enabled at (1240): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (1246): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 CPU: 0 UID: 0 PID: 2413 Comm: aoe_tx0 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 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 : ffff8000a2de76c0 x29: ffff8000a2de76c0 x28: ffff0000c944d6b0 x27: 0000000000000000 x26: ffff0000c944d640 x25: ffff0000d617a238 x24: dfff800000000000 x23: 0000000000000003 x22: 0000000000000000 x21: ffff8000913a3e40 x20: ffff8000978b4dc0 x19: 0000000000000000 x18: 1fffe00033797688 x17: ffff800093524000 x16: ffff800080528e24 x15: 0000000000000001 x14: 1ffff00012f169b8 x13: 0000000000000000 x12: 0000000000000000 x11: ffff800093323be8 x10: 0000000000000003 x9 : 0000000000000000 x8 : 00000000000000c0 x7 : ffff800083e16b00 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000010 x2 : 0000000000000002 x1 : ffff80008eddb55d x0 : ffff80010c595000 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:650 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:5222 [inline] netdev_start_xmit include/linux/netdevice.h:5231 [inline] xmit_one net/core/dev.c:3839 [inline] dev_hard_start_xmit+0x2b0/0x890 net/core/dev.c:3855 __dev_queue_xmit+0x1600/0x32a8 net/core/dev.c:4725 dev_queue_xmit include/linux/netdevice.h:3361 [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: 7797 Comm: syz-executor Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : lock_release+0x270/0x39c arch/arm64/include/asm/irqflags.h:-1 lr : lockdep_recursion_finish kernel/locking/lockdep.c:470 [inline] lr : lock_release+0x250/0x39c kernel/locking/lockdep.c:5891 sp : ffff8000a09570d0 x29: ffff8000a09570e0 x28: 0000000000000003 x27: 0000000000000003 x26: 0000000000000000 x25: ffff80008f726570 x24: 0000000000000003 x23: ffff0000f5cc4808 x22: 0000000000000004 x21: ffff80008f9c93a0 x20: ffff0000f5cc3d00 x19: ffff800080d169ec x18: 0000000000000000 x17: ffff0001fea8c8b0 x16: ffff80008b0156e8 x15: 0000000000000001 x14: 1fffe000213c53b1 x13: 0000000000000000 x12: 0000000000000000 x11: 00000000e5f98abc x10: 0000000000000003 x9 : 0000000000000000 x8 : 00000000000000c0 x7 : ffff800080d16998 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000002 x2 : 0000000000000008 x1 : ffff80008f0be3e7 x0 : 0000000000000001 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) lock_release+0x270/0x39c kernel/locking/lockdep.c:5892 (P) rcu_lock_release+0x30/0x40 include/linux/rcupdate.h:341 rcu_read_unlock_sched include/linux/rcupdate.h:953 [inline] pfn_valid+0x3dc/0x458 include/linux/mmzone.h:2172 page_table_check_clear+0x34/0x570 mm/page_table_check.c:70 __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:1370 [inline] __ptep_get_and_clear arch/arm64/include/asm/pgtable.h:1390 [inline] __get_and_clear_full_ptes arch/arm64/include/asm/pgtable.h:1411 [inline] get_and_clear_full_ptes arch/arm64/include/asm/pgtable.h:1826 [inline] zap_present_folio_ptes mm/memory.c:1499 [inline] zap_present_ptes mm/memory.c:1581 [inline] do_zap_pte_range mm/memory.c:1682 [inline] zap_pte_range mm/memory.c:1726 [inline] zap_pmd_range mm/memory.c:1818 [inline] zap_pud_range mm/memory.c:1847 [inline] zap_p4d_range mm/memory.c:1868 [inline] unmap_page_range+0x2760/0x3168 mm/memory.c:1889 unmap_single_vma mm/memory.c:1932 [inline] unmap_vmas+0x264/0x3d4 mm/memory.c:1976 exit_mmap+0x1bc/0xabc mm/mmap.c:1280 __mmput+0xec/0x3fc kernel/fork.c:1129 mmput+0x70/0xac kernel/fork.c:1152 exit_mm+0x13c/0x200 kernel/exit.c:582 do_exit+0x4bc/0x1a14 kernel/exit.c:949 do_group_exit+0x194/0x22c kernel/exit.c:1102 get_signal+0x11dc/0x12f8 kernel/signal.c:3034 arch_do_signal_or_restart+0x274/0x4434 arch/arm64/kernel/signal.c:1619 exit_to_user_mode_loop+0x7c/0x168 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:103 [inline] el0_svc+0x170/0x254 arch/arm64/kernel/entry-common.c:745 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:763 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596