watchdog: BUG: soft lockup - CPU#0 stuck for 144s! [syz-executor.2:4993] Modules linked in: irq event stamp: 16681839 hardirqs last enabled at (16681838): [] asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 hardirqs last disabled at (16681839): [] sysvec_apic_timer_interrupt+0xa/0xc0 arch/x86/kernel/apic/apic.c:1108 softirqs last enabled at (81080): [] spin_unlock_bh include/linux/spinlock.h:408 [inline] softirqs last enabled at (81080): [] mld_clear_report net/ipv6/mcast.c:857 [inline] softirqs last enabled at (81080): [] ipv6_mc_destroy_dev+0x31a/0x590 net/ipv6/mcast.c:2802 softirqs last disabled at (81175): [] __do_softirq kernel/softirq.c:610 [inline] softirqs last disabled at (81175): [] invoke_softirq kernel/softirq.c:450 [inline] softirqs last disabled at (81175): [] __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:659 CPU: 0 PID: 4993 Comm: syz-executor.2 Not tainted 5.15.189-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:dst_alloc+0x4c/0x160 net/core/dst.c:83 Code: 00 00 00 00 00 fc ff df e8 41 cb 9e f9 49 8d 5c 24 08 48 89 d8 48 c1 e8 03 80 3c 28 00 74 08 48 89 df e8 67 2e e3 f9 4c 8b 33 <4d> 85 f6 41 0f 95 c5 44 89 fb 83 e3 08 31 ff 89 de e8 ee cd 9e f9 RSP: 0018:ffffc900000077f8 EFLAGS: 00000246 RAX: 1ffff11002ee67a9 RBX: ffff888017733d48 RCX: ffff88807468bb80 RDX: 0000000000000100 RSI: ffff888064cd2000 RDI: ffff888017733d40 RBP: dffffc0000000000 R08: 0000000000000000 R09: fffffbfff1ad2dd6 R10: fffffbfff1ad2dd6 R11: 1ffffffff1ad2dd5 R12: ffff888017733d40 R13: ffff888064ec9000 R14: ffffffff88910930 R15: 0000000000000000 FS: 00007f2de03c76c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005605d09d8138 CR3: 00000000763d1000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ip6_dst_alloc net/ipv6/route.c:342 [inline] icmp6_dst_alloc+0x78/0x4a0 net/ipv6/route.c:3268 ndisc_send_skb+0x3e2/0x14a0 net/ipv6/ndisc.c:493 addrconf_rs_timer+0x2b8/0x600 net/ipv6/addrconf.c:3957 call_timer_fn+0x16c/0x530 kernel/time/timer.c:1451 expire_timers kernel/time/timer.c:1496 [inline] __run_timers+0x525/0x7c0 kernel/time/timer.c:1767 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780 handle_softirqs+0x328/0x820 kernel/softirq.c:576 __do_softirq kernel/softirq.c:610 [inline] invoke_softirq kernel/softirq.c:450 [inline] __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:659 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:__unwind_start+0x3/0x740 arch/x86/kernel/unwind_orc.c:631 Code: 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 5d ff ff ff 4c 89 ff e8 4e 90 87 00 e9 50 ff ff ff 66 0f 1f 84 00 00 00 00 00 55 41 57 <41> 56 41 55 41 54 53 48 83 ec 28 48 89 4c 24 10 49 89 d4 49 89 f5 RSP: 0018:ffffc9000335ecb0 EFLAGS: 00000246 RAX: ffff88807468bb80 RBX: ffffc9000335ed80 RCX: ffffc9000335ed50 RDX: 0000000000000000 RSI: ffff88807468bb80 RDI: ffffc9000335ecc8 RBP: ffffc9000335ed50 R08: dffffc0000000000 R09: ffffc9000335ee00 R10: 0000000000000000 R11: 0000000000000040 R12: ffff88807468bb80 R13: ffff8880633d6000 R14: ffffffff816674c0 R15: 0000000000000000 unwind_start arch/x86/include/asm/unwind.h:60 [inline] arch_stack_walk+0xda/0x140 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0x98/0xe0 kernel/stacktrace.c:122 kasan_save_stack+0x35/0x60 mm/kasan/common.c:38 kasan_record_aux_stack+0xb8/0x100 mm/kasan/generic.c:348 kvfree_call_rcu+0x10a/0x7c0 kernel/rcu/tree.c:3600 drop_sysctl_table+0x2fa/0x430 fs/proc/proc_sysctl.c:1685 drop_sysctl_table+0x2e9/0x430 fs/proc/proc_sysctl.c:1688 unregister_sysctl_table+0x87/0x130 fs/proc/proc_sysctl.c:1723 __addrconf_sysctl_unregister net/ipv6/addrconf.c:7131 [inline] addrconf_sysctl_unregister net/ipv6/addrconf.c:7159 [inline] addrconf_ifdown+0x15ed/0x1970 net/ipv6/addrconf.c:3929 addrconf_notify+0x445/0xf00 net/ipv6/addrconf.c:-1 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:391 call_netdevice_notifiers_extack net/core/dev.c:2061 [inline] call_netdevice_notifiers net/core/dev.c:2075 [inline] unregister_netdevice_many+0xf57/0x18f0 net/core/dev.c:11134 vti6_exit_batch_net+0x3c6/0x410 net/ipv6/ip6_vti.c:1190 ops_exit_list net/core/net_namespace.c:177 [inline] setup_net+0x822/0x9f0 net/core/net_namespace.c:365 copy_net_ns+0x348/0x5b0 net/core/net_namespace.c:503 create_new_namespaces+0x3d3/0x6f0 kernel/nsproxy.c:110 copy_namespaces+0x37d/0x3e0 kernel/nsproxy.c:178 copy_process+0x180f/0x3e00 kernel/fork.c:2293 kernel_clone+0x219/0x930 kernel/fork.c:2679 __do_sys_clone kernel/fork.c:2796 [inline] __se_sys_clone kernel/fork.c:2780 [inline] __x64_sys_clone+0x170/0x1c0 kernel/fork.c:2780 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f2de10a9da9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2de03c7078 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f2de11d81f0 RCX: 00007f2de10a9da9 RDX: 0000000000000000 RSI: 0100000000000000 RDI: 0030626f7c2a0000 RBP: 00007f2de10f647a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 000000000000006e R14: 00007f2de11d81f0 R15: 00007ffc151b0448 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4928 Comm: syz-executor.3 Not tainted 5.15.189-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] RIP: 0010:arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] RIP: 0010:kvm_wait+0x141/0x190 arch/x86/kernel/kvm.c:918 Code: 89 df 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 47 0f b6 1f e8 5f da 49 00 44 38 e3 75 10 66 90 0f 00 2d 61 63 d4 08 fb f4 33 ff ff ff fb e9 2d ff ff ff e8 7f 25 74 08 89 f9 80 e1 07 38 RSP: 0018:ffffc90002ddf580 EFLAGS: 00000246 RAX: e5dacee743782a00 RBX: 0000000000000003 RCX: e5dacee743782a00 RDX: dffffc0000000000 RSI: ffffffff8a0b15c0 RDI: ffffffff8a599340 RBP: ffffc90002ddf630 R08: dffffc0000000000 R09: fffffbfff1ff6e1a R10: fffffbfff1ff6e1a R11: 1ffffffff1ff6e19 R12: 0000000000000003 R13: ffff8880b913b114 R14: dffffc0000000000 R15: 1ffff920005bbeb0 FS: 00007fd4f6d536c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005605d09c2950 CR3: 000000007506d000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: pv_wait arch/x86/include/asm/paravirt.h:597 [inline] pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline] __pv_queued_spin_lock_slowpath+0x60f/0x9c0 kernel/locking/qspinlock.c:508 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:585 [inline] queued_spin_lock_slowpath+0x43/0x50 arch/x86/include/asm/qspinlock.h:51 queued_spin_lock include/asm-generic/qspinlock.h:85 [inline] do_raw_spin_lock+0x217/0x280 kernel/locking/spinlock_debug.c:115 spin_lock include/linux/spinlock.h:363 [inline] unregister_sysctl_table+0x7f/0x130 fs/proc/proc_sysctl.c:1722 sysctl_route_net_exit+0x58/0x80 net/ipv4/route.c:3673 ops_exit_list net/core/net_namespace.c:172 [inline] setup_net+0x7ad/0x9f0 net/core/net_namespace.c:365 copy_net_ns+0x348/0x5b0 net/core/net_namespace.c:503 create_new_namespaces+0x3d3/0x6f0 kernel/nsproxy.c:110 copy_namespaces+0x37d/0x3e0 kernel/nsproxy.c:178 copy_process+0x180f/0x3e00 kernel/fork.c:2293 kernel_clone+0x219/0x930 kernel/fork.c:2679 __do_sys_clone kernel/fork.c:2796 [inline] __se_sys_clone kernel/fork.c:2780 [inline] __x64_sys_clone+0x170/0x1c0 kernel/fork.c:2780 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fd4f79f3da9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd4f6d53078 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007fd4f7b22050 RCX: 00007fd4f79f3da9 RDX: 0000000000000000 RSI: 0100000000000000 RDI: 0030626f7c2a0000 RBP: 00007fd4f7a4047a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 000000000000006e R14: 00007fd4f7b22050 R15: 00007ffcf4a2f108