watchdog: BUG: soft lockup - CPU#1 stuck for 26s! [aoe_tx0:2454] Modules linked in: irq event stamp: 67625039 hardirqs last enabled at (67625038): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (67625038): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (67625039): [] enter_from_kernel_mode+0x14/0x34 arch/arm64/kernel/entry-common.c:42 softirqs last enabled at (3866): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (3870): [] 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_atomic_try_cmpxchg include/linux/atomic/atomic-arch-fallback.h:2140 [inline] pc : raw_atomic_fetch_add_unless include/linux/atomic/atomic-arch-fallback.h:2431 [inline] pc : raw_atomic_add_unless include/linux/atomic/atomic-arch-fallback.h:2456 [inline] pc : atomic_add_unless include/linux/atomic/atomic-instrumented.h:1518 [inline] pc : uart_port_ref drivers/tty/serial/serial_core.c:67 [inline] pc : uart_port_ref_lock+0x74/0x35c drivers/tty/serial/serial_core.c:80 lr : __lse__cmpxchg_case_mb_32 arch/arm64/include/asm/atomic_lse.h:279 [inline] lr : __cmpxchg_case_mb_32 arch/arm64/include/asm/cmpxchg.h:128 [inline] lr : __cmpxchg_mb arch/arm64/include/asm/cmpxchg.h:171 [inline] lr : raw_atomic_cmpxchg include/linux/atomic/atomic-arch-fallback.h:2026 [inline] lr : raw_atomic_try_cmpxchg include/linux/atomic/atomic-arch-fallback.h:2139 [inline] lr : raw_atomic_fetch_add_unless include/linux/atomic/atomic-arch-fallback.h:2431 [inline] lr : raw_atomic_add_unless include/linux/atomic/atomic-arch-fallback.h:2456 [inline] lr : atomic_add_unless include/linux/atomic/atomic-instrumented.h:1518 [inline] lr : uart_port_ref drivers/tty/serial/serial_core.c:67 [inline] lr : uart_port_ref_lock+0x6c/0x35c drivers/tty/serial/serial_core.c:80 sp : ffff8000a24b76e0 x29: ffff8000a24b76e0 x28: ffff0000c71611b0 x27: 0000000000000000 x26: ffff0000c7161140 x25: 0000000000000001 x24: dfff800000000000 x23: 0000000000000002 x22: 0000000000000001 x21: ffff0000c9cf0f84 x20: ffff8000a24b7740 x19: ffff0000c9cf0be8 x18: 00000000ffffffff x17: ffff800093325000 x16: ffff80008052bd88 x15: 0000000000000001 x14: 1fffe0001939e1f0 x13: 0000000000000000 x12: 0000000000000000 x11: ffff60001939e1f1 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : ffff0000cd97bd80 x7 : ffff800083b2f6bc x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : ffff800083b2f61c x2 : 0000000000000001 x1 : 0000000000000001 x0 : 0000000000000000 Call trace: __lse__cmpxchg_case_mb_32 arch/arm64/include/asm/atomic_lse.h:279 [inline] (P) __cmpxchg_case_mb_32 arch/arm64/include/asm/cmpxchg.h:128 [inline] (P) __cmpxchg_mb arch/arm64/include/asm/cmpxchg.h:171 [inline] (P) raw_atomic_cmpxchg include/linux/atomic/atomic-arch-fallback.h:2026 [inline] (P) raw_atomic_try_cmpxchg include/linux/atomic/atomic-arch-fallback.h:2139 [inline] (P) raw_atomic_fetch_add_unless include/linux/atomic/atomic-arch-fallback.h:2431 [inline] (P) raw_atomic_add_unless include/linux/atomic/atomic-arch-fallback.h:2456 [inline] (P) atomic_add_unless include/linux/atomic/atomic-instrumented.h:1518 [inline] (P) uart_port_ref drivers/tty/serial/serial_core.c:67 [inline] (P) uart_port_ref_lock+0x74/0x35c drivers/tty/serial/serial_core.c:80 (P) uart_write_room+0x60/0x15c drivers/tty/serial/serial_core.c:645 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: 10025 Comm: syz-executor Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 pstate: 23400005 (nzCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : check_kcov_mode kernel/kcov.c:183 [inline] pc : __sanitizer_cov_trace_pc+0x1c/0x84 kernel/kcov.c:217 lr : rcu_read_lock include/linux/rcupdate.h:868 [inline] lr : page_table_check_clear+0x1b0/0x570 mm/page_table_check.c:77 sp : ffff80009e417190 x29: ffff80009e4171a0 x28: ffff0001188a1e60 x27: 00000000f5000000 x26: 1fffffbff88c1379 x25: fffffdffc4609bc0 x24: ffffc1ffc0000000 x23: ffff80008eeb0000 x22: 1ffff00011dd6171 x21: 0000000000000001 x20: 0000000000000000 x19: 0000000000000001 x18: 1fffe000337d6e90 x17: ffff0001fea8c870 x16: ffff800082dee240 x15: 0000000000000001 x14: 1fffe000231143cc x13: 0000000000000000 x12: 0000000000000000 x11: 0000000029c67f14 x10: 0000000000ff0100 x9 : 0000000000000001 x8 : ffff0000d14e8000 x7 : ffff800080d2df7c x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000002 x2 : 0000000000000008 x1 : ffff80008b3fb300 x0 : 0000000000000001 Call trace: preempt_count arch/arm64/include/asm/preempt.h:12 [inline] (P) check_kcov_mode kernel/kcov.c:183 [inline] (P) __sanitizer_cov_trace_pc+0x1c/0x84 kernel/kcov.c:217 (P) __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:1376 [inline] __ptep_get_and_clear arch/arm64/include/asm/pgtable.h:1396 [inline] __get_and_clear_full_ptes arch/arm64/include/asm/pgtable.h:1417 [inline] get_and_clear_full_ptes arch/arm64/include/asm/pgtable.h:1832 [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