RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001 R10: 0000555571ed77d0 R11: 0000000000000246 R12: 0000000000000000 R13: 00000000000927c0 R14: 000000000006adf7 R15: 00007ffe4614cc10 watchdog: BUG: soft lockup - CPU#1 stuck for 245s! [syz-executor:11999] Modules linked in: irq event stamp: 2655846 hardirqs last enabled at (2655845): [] irqentry_exit+0x1dd/0x8c0 kernel/entry/common.c:219 hardirqs last disabled at (2655846): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (2655844): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (2655844): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (2655844): [] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:723 softirqs last disabled at (2655793): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (2655793): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (2655793): [] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 11999 Comm: syz-executor Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xe02/0x15e0 kernel/smp.c:877 Code: 10 4c 89 74 24 10 49 89 d5 48 89 d5 48 89 54 24 18 49 c1 ed 03 83 e5 07 4d 01 e5 83 c5 03 e8 65 5b 0c 00 f3 90 41 0f b6 45 00 <40> 38 c5 7c 08 84 c0 0f 85 b6 05 00 00 8b 43 08 31 ff 83 e0 01 41 RSP: 0018:ffffc9000b67f720 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff8880b8443020 RCX: ffffffff81b288d1 RDX: ffff888020a85b80 RSI: ffffffff81b288ab RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000 R13: ffffed1017088605 R14: 0000000000000001 R15: 0000000000000000 FS: 0000555571ed7500(0000) GS:ffff888124a08000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c37b0f4 CR3: 00000000677f3000 CR4: 0000000000350ef0 Call Trace: on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1043 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline] flush_tlb_multi arch/x86/mm/tlb.c:1382 [inline] flush_tlb_mm_range+0x2f0/0x12c0 arch/x86/mm/tlb.c:1472 dup_mmap+0xd04/0x20e0 mm/mmap.c:1866 dup_mm kernel/fork.c:1529 [inline] copy_mm kernel/fork.c:1581 [inline] copy_process+0x3b9f/0x7430 kernel/fork.c:2221 kernel_clone+0xfc/0x910 kernel/fork.c:2651 __do_sys_clone+0xce/0x120 kernel/fork.c:2792 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f198df85e93 Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00 RSP: 002b:00007ffe4614ca78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f198df85e93 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001 R10: 0000555571ed77d0 R11: 0000000000000246 R12: 0000000000000000 R13: 00000000000927c0 R14: 000000000006adf7 R15: 00007ffe4614cc10 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 2989 Comm: kworker/u8:10 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: netns cleanup_net RIP: 0010:__lock_acquire+0x114/0x2890 kernel/locking/lockdep.c:5145 Code: f6 0f 85 30 0c 00 00 48 2d 60 5a b8 95 4d 8d 9c 24 30 0b 00 00 49 89 c1 48 b8 29 5c 8f c2 f5 28 5c 8f 49 c1 f9 03 4c 0f af c8 <89> e8 4c 8d 34 80 49 c1 e6 03 85 ed 74 28 f6 84 24 c8 00 00 00 01 RSP: 0018:ffffc90000007c38 EFLAGS: 00000813 RAX: 8f5c28f5c28f5c29 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880540212c0 RBP: 0000000000000008 R08: 0000000000000001 R09: 0000000000000dc2 R10: 0000000000000000 R11: ffff888030374830 R12: ffff888030373d00 R13: ffff8880540212c0 R14: 000000009b080c01 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff888124908000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc4083cb98 CR3: 000000007d1e8000 CR4: 0000000000350ef0 Call Trace: lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x179/0x330 kernel/locking/lockdep.c:5825 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] advance_sched+0xd9/0xc80 net/sched/sch_taprio.c:930 __run_hrtimer kernel/time/hrtimer.c:1777 [inline] __hrtimer_run_queues+0x202/0xc40 kernel/time/hrtimer.c:1841 hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1903 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x10b/0x3c0 arch/x86/kernel/apic/apic.c:1062 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:__schedule+0x1153/0x6150 kernel/sched/core.c:6719 Code: 10 48 8b bd 70 ff ff ff 4c 89 f6 e8 97 13 b5 f5 48 89 c7 e8 1f 8c 14 f6 8b bd 68 ff ff ff e8 34 de 13 f6 48 8b 8d d8 fe ff ff <48> b8 00 00 00 00 00 fc ff df 48 c7 04 01 00 00 00 00 48 8b 45 d0 RSP: 0018:ffffc9000b446c98 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffffffff8b768d29 RCX: 1ffff92001688dac RDX: 0000000000000000 RSI: ffffffff8bf24480 RDI: ffffffff8dd6bf20 RBP: ffffc9000b446de8 R08: 0000000000000000 R09: fffffbfff21105ba R10: ffffffff90882dd7 R11: ffff888030374830 R12: 0000000000000000 R13: ffff8880303752d4 R14: ffff88807cba3d00 R15: ffff8880b843adc0 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7190 irqentry_exit+0x1d8/0x8c0 kernel/entry/common.c:216 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:lock_is_held_type+0x107/0x150 kernel/locking/lockdep.c:5945 Code: 00 00 b8 ff ff ff ff 65 0f c1 05 5c 20 3c 08 83 f8 01 75 2d 9c 58 f6 c4 02 75 43 48 f7 04 24 00 02 00 00 74 01 fb 48 83 c4 08 <44> 89 e8 5b 5d 41 5c 41 5d 41 5e 41 5f e9 f2 99 9a f5 45 31 ed eb RSP: 0018:ffffc9000b446f00 EFLAGS: 00000296 RAX: 0000000000000046 RBX: ffff888030374948 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8da9a67a RDI: ffffffff8bf24500 RBP: ffffffff8e3c9560 R08: 00000000affe109a R09: 00000000aaffe109 R10: 0000000000000000 R11: ffff888030374830 R12: ffff888030373d00 R13: 0000000000000000 R14: 00000000ffffffff R15: 0000000000000008 lock_is_held include/linux/lockdep.h:249 [inline] __might_resched+0x4ca/0x5e0 kernel/sched/core.c:8789 might_alloc include/linux/sched/mm.h:323 [inline] might_alloc include/linux/sched/mm.h:315 [inline] slab_pre_alloc_hook mm/slub.c:4899 [inline] slab_alloc_node mm/slub.c:5234 [inline] __kmalloc_cache_noprof+0x49f/0x800 mm/slub.c:5766 kmalloc_noprof include/linux/slab.h:957 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] mld_add_delrec net/ipv6/mcast.c:743 [inline] igmp6_leave_group net/ipv6/mcast.c:2667 [inline] igmp6_group_dropped+0x5dc/0x1050 net/ipv6/mcast.c:724 __ipv6_dev_mc_dec+0x265/0x340 net/ipv6/mcast.c:1001 addrconf_leave_solict net/ipv6/addrconf.c:2257 [inline] __ipv6_ifa_notify+0x3e0/0xfd0 net/ipv6/addrconf.c:6299 addrconf_ifdown.isra.0+0xe9a/0x1b90 net/ipv6/addrconf.c:3977 addrconf_notify+0x220/0x19f0 net/ipv6/addrconf.c:3776 notifier_call_chain+0xbc/0x3e0 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x110 net/core/dev.c:2230 call_netdevice_notifiers_extack net/core/dev.c:2268 [inline] call_netdevice_notifiers net/core/dev.c:2282 [inline] netif_close_many+0x319/0x630 net/core/dev.c:1785 netif_close_many_and_unlock+0x24/0x270 net/core/dev.c:12281 unregister_netdevice_many_notify+0x38f/0x2590 net/core/dev.c:12345 unregister_netdevice_many net/core/dev.c:12444 [inline] unregister_netdevice_queue net/core/dev.c:12258 [inline] unregister_netdevice_queue+0x305/0x3c0 net/core/dev.c:12248 unregister_netdevice include/linux/netdevice.h:3405 [inline] nsim_destroy+0x1a0/0x830 drivers/net/netdevsim/netdev.c:1180 __nsim_dev_port_del+0x189/0x240 drivers/net/netdevsim/dev.c:1528 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1540 [inline] nsim_dev_reload_destroy+0x10a/0x4d0 drivers/net/netdevsim/dev.c:1763 nsim_dev_reload_down+0x66/0xd0 drivers/net/netdevsim/dev.c:1038 devlink_reload+0x1a1/0x7c0 net/devlink/dev.c:461 devlink_pernet_pre_exit+0x1a0/0x2b0 net/devlink/core.c:509 ops_pre_exit_list net/core/net_namespace.c:161 [inline] ops_undo_list+0x187/0xab0 net/core/net_namespace.c:234 cleanup_net+0x41b/0x830 net/core/net_namespace.c:696 process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257 process_scheduled_works kernel/workqueue.c:3340 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246