watchdog: BUG: soft lockup - CPU#0 stuck for 21s! [syz-executor:23125] Modules linked in: irq event stamp: 364 hardirqs last enabled at (363): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:210 [inline] hardirqs last enabled at (363): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:221 hardirqs last disabled at (364): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:153 [inline] hardirqs last disabled at (364): [] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:181 softirqs last enabled at (280): [] local_bh_enable include/linux/bottom_half.h:33 [inline] softirqs last enabled at (280): [] put_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:251 [inline] softirqs last enabled at (280): [] do_sve_acc+0x3ac/0x56c arch/arm64/kernel/fpsimd.c:1333 softirqs last disabled at (278): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (278): [] get_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:234 [inline] softirqs last disabled at (278): [] do_sve_acc+0x104/0x56c arch/arm64/kernel/fpsimd.c:1308 CPU: 0 UID: 0 PID: 23125 Comm: syz-executor Tainted: G M syzkaller #0 PREEMPT Tainted: [M]=MACHINE_CHECK Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/23/2026 pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:211 [inline] pc : _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:221 lr : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:210 [inline] lr : _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:221 sp : ffff8000964d7510 x29: ffff8000964d7510 x28: ffff0000d2baa210 x27: 0000000000000000 x26: 0000000000000001 x25: dfff800000000000 x24: 0000000000000000 x23: 00000000000102c9 x22: ffff800088a7ab88 x21: ffff800088a7a000 x20: ffff800088c66cd8 x19: 0000000000000000 x18: 00000000ffffffff x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000062169 x13: 0000000000000001 x12: 0000000000000000 x11: ffff800080155708 x10: ffff800088576668 x9 : ffff800125472000 x8 : 00000000000000c0 x7 : 0000000000000000 x6 : ffff8000803a6318 x5 : 0000000000000001 x4 : 0000000000000008 x3 : ffff8000801557b0 x2 : 0000000000000000 x1 : ffff0000d2ba9d80 x0 : ffff80008688fdec dump_backtrace(regs = 000000008aeb48a6 tsk = 0000000000000000) 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:210 [inline] (P) _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:221 (P) swake_up_one+0x34/0x44 kernel/sched/swait.c:54 rcu_gp_kthread_wake+0xc4/0x124 kernel/rcu/tree.c:1124 rcu_report_qs_rsp+0xfc/0x160 kernel/rcu/tree.c:2355 rcu_report_unblock_qs_rnp kernel/rcu/tree.c:2459 [inline] rcu_preempt_deferred_qs_irqrestore+0x6dc/0x8b0 kernel/rcu/tree_plugin.h:571 rcu_read_unlock_special+0x334/0x4bc kernel/rcu/tree_plugin.h:798 __rcu_read_unlock+0xa4/0x10c kernel/rcu/tree_plugin.h:438 rcu_read_unlock include/linux/rcupdate.h:882 [inline] task_dump_owner+0x348/0x468 fs/proc/base.c:1906 pid_update_inode fs/proc/base.c:2032 [inline] proc_pident_instantiate+0x1a8/0x268 fs/proc/base.c:2679 proc_pident_lookup+0x208/0x260 fs/proc/base.c:2702 proc_tgid_base_lookup+0x34/0x44 fs/proc/base.c:3418 lookup_open+0x6a8/0x1180 fs/namei.c:4528 open_last_lookups fs/namei.c:4767 [inline] path_openat+0x50c/0x18f0 fs/namei.c:4997 do_file_open+0x1c8/0x2e8 fs/namei.c:5029 do_sys_openat2+0x114/0x1e8 fs/open.c:1417 do_sys_open+0xb0/0xe0 fs/open.c:1423 __do_sys_openat fs/open.c:1439 [inline] __se_sys_openat fs/open.c:1434 [inline] __arm64_sys_openat+0xa8/0xc4 fs/open.c:1434 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 23171 Comm: syz-executor Tainted: G M syzkaller #0 PREEMPT Tainted: [M]=MACHINE_CHECK Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/23/2026 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : folio_mark_accessed+0x548/0x824 mm/folio.c:456 lr : folio_mark_accessed+0x514/0x824 mm/folio.c:454 sp : ffff800095d870f0 x29: ffff800095d87100 x28: fffffdffc4c6a418 x27: 0010000000000001 x26: fffffdffc4c6a400 x25: dfff800000000000 x24: 0000000000000000 x23: 0000ffff83a89000 x22: 0068000171a90fc3 x21: 1fffffbff898d483 x20: fffffdffc4c6a400 x19: 0000000004098003 x18: ffff800125498000 x17: ffff0001aded5e12 x16: ffff0000c3b4d894 x15: 00000000000000f7 x14: fffffffffffffff6 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: ffff7fbff898d481 x9 : 0000000000000000 x8 : 0000000000000000 x7 : 0000000000000000 x6 : ffff800080c33ca0 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff80008095d87c x2 : 0000000000000000 x1 : ffff0000c3b4d880 x0 : 0000000000000000 dump_backtrace(regs = 00000000661bc996 tsk = 0000000000000000) Call trace: folio_mark_accessed+0x548/0x824 mm/folio.c:456 (P) zap_present_folio_ptes mm/memory.c:1788 [inline] zap_present_ptes mm/memory.c:1861 [inline] do_zap_pte_range mm/memory.c:1963 [inline] zap_pte_range mm/memory.c:2065 [inline] zap_pmd_range mm/memory.c:2151 [inline] zap_pud_range mm/memory.c:2179 [inline] zap_p4d_range mm/memory.c:2200 [inline] __zap_vma_range+0x17ec/0x4348 mm/memory.c:2240 unmap_vmas+0x2e0/0x43c mm/memory.c:2309 exit_mmap+0x1e8/0x9bc mm/mmap.c:1315 __mmput+0xe0/0x2e8 kernel/fork.c:1193 mmput+0x70/0xa8 kernel/fork.c:1216 exit_mm+0x13c/0x1f0 kernel/exit.c:592 do_exit+0x524/0x1a74 kernel/exit.c:974 do_group_exit+0x198/0x238 kernel/exit.c:1129 get_signal+0xfb0/0x1094 kernel/signal.c:3112 arch_do_signal_or_restart+0x288/0x444c arch/arm64/kernel/signal.c:1671 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline] exit_to_user_mode_loop+0x70/0x17c kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] arm64_syscall_exit_to_user_mode arch/arm64/kernel/entry-common.c:146 [inline] el0_svc+0x12c/0x1d8 arch/arm64/kernel/entry-common.c:797 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 wireguard: wg1: Handshake for peer 34 (127.0.0.1:20003) did not complete after 5 seconds, retrying (try 7) ipvlan_process_outbound: 7 callbacks suppressed Dropped {multi|broad}cast of type=[86dd] Dropped {multi|broad}cast of type=[86dd] wireguard: wg1: Handshake for peer 46 (127.0.0.1:20003) did not complete after 5 seconds, retrying (try 9) wireguard: wg1: Handshake for peer 33 ([::1]:20001/0%0) did not complete after 5 seconds, retrying (try 12) wireguard: wg0: Handshake for peer 43 (127.0.0.1:20002) did not complete after 5 seconds, retrying (try 2) wireguard: wg0: Handshake for peer 50 ([::1]:20003/0%0) did not complete after 5 seconds, retrying (try 11) wireguard: wg2: Handshake for peer 35 ([::1]:20001/0%0) did not complete after 5 seconds, retrying (try 11) wireguard: wg0: Handshake for peer 31 ([::1]:20002/0%0) did not complete after 5 seconds, retrying (try 2) wireguard: wg1: Handshake for peer 39 ([::1]:20001/0%0) did not complete after 5 seconds, retrying (try 9) wireguard: wg2: Retrying handshake with peer 60 (127.0.0.1:20002) because we stopped hearing back after 15 seconds Dropped {multi|broad}cast of type=[86dd] percpu_ref_switch_to_atomic_rcu: global 9223372036854775809 percpu 0 percpu_ref_switch_to_atomic_rcu: global 9223372036854775808 percpu 1 wireguard: wg2: Handshake for peer 36 (127.0.0.1:20002) did not complete after 5 seconds, retrying (try 11) sctp: ***sctp_transmit_packet*** skb->len:16 sctp: sctp_v4_xmit: skb:00000000b0cf22ce, len:16, src:127.0.0.1, dst:127.0.0.1 sctp: sctp_packet_free: packet:00000000dec51150 sctp: sctp_do_sm[post-sfx]: error:0, asoc:0000000000000000[STATE_CLOSED]