watchdog: BUG: soft lockup - CPU#1 stuck for 42s! [syz-executor:10163] Modules linked in: irq event stamp: 57251 hardirqs last enabled at (57251): [] __local_bh_enable_ip+0x1ec/0x35c kernel/softirq.c:455 hardirqs last disabled at (57249): [] __local_bh_enable_ip+0x16c/0x35c kernel/softirq.c:432 softirqs last enabled at (57250): [] spin_unlock_bh include/linux/spinlock.h:396 [inline] softirqs last enabled at (57250): [] __neigh_ifdown+0xb8/0x57c net/core/neighbour.c:472 softirqs last disabled at (57248): [] spin_lock_bh include/linux/spinlock.h:348 [inline] softirqs last disabled at (57248): [] __neigh_ifdown+0x94/0x57c net/core/neighbour.c:465 CPU: 1 UID: 0 PID: 10163 Comm: syz-executor Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026 pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : lock_acquire+0x16c/0x364 arch/arm64/include/asm/irqflags.h:-1 lr : lockdep_recursion_finish kernel/locking/lockdep.c:470 [inline] lr : lock_acquire+0x14c/0x364 kernel/locking/lockdep.c:5870 sp : ffff800090fa6d70 x29: ffff800090fa6dc0 x28: 0000000000000000 x27: 0000000000000000 x26: ffff8000889b0230 x25: 0000000000000000 x24: 0000000000000001 x23: 0000000000000000 x22: ffff800089d98058 x21: ffff800084c3b188 x20: 0000000000000000 x19: 0000000000000000 x18: 1fffe00035bf0220 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000001 x12: ffff0000cc4ed700 x11: 000000000000458f x10: 0000000000000003 x9 : 0000000000000000 x8 : 00000000000000c0 x7 : 0000000000000000 x6 : ffff80008048076c x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800080490b5c x2 : 0000000100000001 x1 : ffff0000cc4ed700 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_acquire+0x16c/0x364 kernel/locking/lockdep.c:5871 (P) __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x164/0xed0 kernel/locking/mutex.c:820 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:873 pneigh_ifdown net/core/neighbour.c:877 [inline] __neigh_ifdown+0x10c/0x57c net/core/neighbour.c:474 neigh_ifdown+0x2c/0x40 net/core/neighbour.c:491 arp_ifdown+0x28/0x38 net/ipv4/arp.c:1367 inetdev_destroy net/ipv4/devinet.c:336 [inline] inetdev_event+0x5c8/0x11ac net/ipv4/devinet.c:1655 notifier_call_chain+0x1a4/0x624 kernel/notifier.c:85 raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:453 call_netdevice_notifiers_info+0xb8/0x120 net/core/dev.c:2249 call_netdevice_notifiers_extack net/core/dev.c:2287 [inline] call_netdevice_notifiers net/core/dev.c:2301 [inline] unregister_netdevice_many_notify+0xf44/0x18f4 net/core/dev.c:12421 unregister_netdevice_many net/core/dev.c:12484 [inline] unregister_netdevice_queue+0x274/0x30c net/core/dev.c:12294 unregister_netdevice include/linux/netdevice.h:3444 [inline] nsim_destroy+0x240/0x5f0 drivers/net/netdevsim/netdev.c:1193 __nsim_dev_port_del+0x13c/0x1ec drivers/net/netdevsim/dev.c:1547 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1561 [inline] nsim_dev_reload_destroy+0x13c/0x210 drivers/net/netdevsim/dev.c:1785 nsim_drv_remove+0x5c/0x114 drivers/net/netdevsim/dev.c:1800 nsim_bus_remove+0x20/0x30 drivers/net/netdevsim/bus.c:427 device_remove+0xc4/0x134 drivers/base/dd.c:619 __device_release_driver drivers/base/dd.c:1352 [inline] device_release_driver_internal+0x124/0x20c drivers/base/dd.c:1375 device_release_driver+0x28/0x38 drivers/base/dd.c:1398 bus_remove_device+0x2d0/0x400 drivers/base/bus.c:657 device_del+0x3ec/0x71c drivers/base/core.c:3895 device_unregister+0x2c/0xf0 drivers/base/core.c:3936 nsim_bus_dev_del+0x60/0x8c drivers/net/netdevsim/bus.c:491 del_device_store+0x24c/0x2d4 drivers/net/netdevsim/bus.c:244 bus_attr_store+0x80/0xa4 drivers/base/bus.c:172 sysfs_kf_write+0xe0/0x108 fs/sysfs/file.c:142 kernfs_fop_write_iter+0x260/0x3b8 fs/kernfs/file.c:352 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x51c/0xa0c fs/read_write.c:688 ksys_write+0x12c/0x228 fs/read_write.c:740 __do_sys_write fs/read_write.c:751 [inline] __se_sys_write fs/read_write.c:748 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:748 __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+0x64/0x260 arch/arm64/kernel/entry-common.c:736 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 10345 Comm: syz-executor Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : write_comp_data+0x34/0x84 kernel/kcov.c:246 lr : __sanitizer_cov_trace_cmp8+0x24/0x30 kernel/kcov.c:294 sp : ffff800092597040 x29: ffff800092597040 x28: 006800014dbf6fc3 x27: dfff800000000000 x26: 0000ffff9fbf3000 x25: fffffdffc436fd80 x24: 00003c000436fd80 x23: ffff0000df9f3a00 x22: 0000000000000006 x21: 0000000000000000 x20: 0000000000004000 x19: ffff800080c1bc34 x18: 1fffe00035beb820 x17: 0000000000000002 x16: ffff0001fea147c0 x15: ffff0001fea147c0 x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: 0000000000000003 x9 : 0000000000000000 x8 : 0000000000000000 x7 : 0000000000000000 x6 : ffff800080c1ca3c x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800080c1bc34 x2 : 0000000000004000 x1 : ffff0000df9f3a00 x0 : 0000000000000003 Call trace: write_comp_data+0x34/0x84 kernel/kcov.c:-1 (P) __sanitizer_cov_trace_cmp8+0x24/0x30 kernel/kcov.c:294 __nr_to_section include/linux/mmzone.h:2061 [inline] __pfn_to_section include/linux/mmzone.h:2198 [inline] lookup_page_ext+0x90/0x198 mm/page_ext.c:255 page_ext_lookup+0x64/0x74 mm/page_ext.c:513 page_ext_iter_begin include/linux/page_ext.h:133 [inline] page_table_check_clear+0x21c/0x504 mm/page_table_check.c:78 __page_table_check_pte_clear+0xa0/0xc0 mm/page_table_check.c:155 page_table_check_pte_clear include/linux/page_table_check.h:55 [inline] __ptep_get_and_clear_anysz arch/arm64/include/asm/pgtable.h:1361 [inline] __ptep_get_and_clear arch/arm64/include/asm/pgtable.h:1381 [inline] __get_and_clear_full_ptes arch/arm64/include/asm/pgtable.h:1402 [inline] get_and_clear_full_ptes arch/arm64/include/asm/pgtable.h:1817 [inline] zap_present_folio_ptes mm/memory.c:1648 [inline] zap_present_ptes mm/memory.c:1730 [inline] do_zap_pte_range mm/memory.c:1832 [inline] zap_pte_range mm/memory.c:1934 [inline] zap_pmd_range mm/memory.c:2020 [inline] zap_pud_range mm/memory.c:2048 [inline] zap_p4d_range mm/memory.c:2069 [inline] __zap_vma_range+0x2aa8/0x41dc mm/memory.c:2109 unmap_vmas+0x2e0/0x43c mm/memory.c:2178 exit_mmap+0x1e8/0xad4 mm/mmap.c:1300 __mmput+0xe0/0x2e8 kernel/fork.c:1178 mmput+0x70/0xa8 kernel/fork.c:1201 exit_mm+0x18c/0x260 kernel/exit.c:582 do_exit+0x524/0x1a74 kernel/exit.c:964 do_group_exit+0x198/0x238 kernel/exit.c:1119 get_signal+0xfb0/0x1094 kernel/signal.c:3038 arch_do_signal_or_restart+0x288/0x444c arch/arm64/kernel/signal.c:1665 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop+0x70/0x17c kernel/entry/common.c:98 __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:88 [inline] el0_svc+0x18c/0x260 arch/arm64/kernel/entry-common.c:737 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 ip6_tunnel: ip6gretap1 xmit: Local address not yet configured!