RBP: 0000000000037b31 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b33020000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f43b47dffac R14: 00007f43b47dffa8 R15: 00007f43b47dffa0
 </TASK>
watchdog: BUG: soft lockup - CPU#0 stuck for 225s! [syz.1.18:399]
Modules linked in:
CPU: 0 PID: 399 Comm: syz.1.18 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x56/0x80 kernel/locking/spinlock.c:194
Code: 47 6d 86 e8 4c a7 f4 fc 4c 89 f7 48 83 3d d9 b0 b8 01 00 74 31 e8 ae 60 9b fc 66 90 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> a5 2e 93 fc 65 8b 05 06 d7 4d 7b 85 c0 74 05 5b 41 5e 5d c3 e8
RSP: 0018:ffffc90000007260 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000a02 RCX: dffffc0000000000
RDX: dffffc0000000000 RSI: 0000000000000a02 RDI: 0000000000000001
RBP: ffffc90000007270 R08: ffff88810be74f07 R09: 1ffff110217ce9e0
R10: dffffc0000000000 R11: ffffed10217ce9e1 R12: 0000000000000a02
R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff86d4a060
FS:  000055555a803500(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000037b31 CR3: 0000000132a99000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 spin_unlock_irqrestore include/linux/spinlock.h:419 [inline]
 __wake_up_common_lock kernel/sched/wait.c:141 [inline]
 __wake_up+0x11c/0x180 kernel/sched/wait.c:158
 netlink_unlock_table net/netlink/af_netlink.c:461 [inline]
 netlink_broadcast_filtered+0x11d9/0x1280 net/netlink/af_netlink.c:1541
 netlink_broadcast net/netlink/af_netlink.c:1561 [inline]
 nlmsg_multicast include/net/netlink.h:1033 [inline]
 nlmsg_notify+0xe9/0x1a0 net/netlink/af_netlink.c:2563
 rtnl_notify+0x9a/0xc0 net/core/rtnetlink.c:762
 __neigh_notify+0xd3/0x130 net/core/neighbour.c:3390
 neigh_cleanup_and_release+0x2c/0x1a0 net/core/neighbour.c:101
 neigh_del net/core/neighbour.c:197 [inline]
 neigh_remove_one+0x36e/0x3f0 net/core/neighbour.c:218
 neigh_forced_gc net/core/neighbour.c:251 [inline]
 neigh_alloc net/core/neighbour.c:429 [inline]
 ___neigh_create+0x492/0x1c50 net/core/neighbour.c:591
 __neigh_create+0x31/0x40 net/core/neighbour.c:679
 ip6_finish_output2+0xae3/0x1790 net/ipv6/ip6_output.c:127
 __ip6_finish_output+0x623/0x7e0 net/ipv6/ip6_output.c:201
 ip6_finish_output+0x31/0x220 net/ipv6/ip6_output.c:211
 NF_HOOK_COND include/linux/netfilter.h:294 [inline]
 ip6_output+0x1fa/0x410 net/ipv6/ip6_output.c:234
 dst_output include/net/dst.h:453 [inline]
 NF_HOOK include/linux/netfilter.h:305 [inline]
 ndisc_send_skb+0x7f8/0xd00 net/ipv6/ndisc.c:513
 ndisc_send_rs+0x711/0x960 net/ipv6/ndisc.c:707
 addrconf_rs_timer+0x35a/0x600 net/ipv6/addrconf.c:3990
 call_timer_fn+0x38/0x290 kernel/time/timer.c:1459
 expire_timers kernel/time/timer.c:1504 [inline]
 __run_timers+0x637/0x9a0 kernel/time/timer.c:1775
 run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1788
 handle_softirqs+0x250/0x560 kernel/softirq.c:583
 __do_softirq kernel/softirq.c:621 [inline]
 invoke_softirq kernel/softirq.c:443 [inline]
 __irq_exit_rcu+0x52/0xf0 kernel/softirq.c:670
 irq_exit_rcu+0x9/0x10 kernel/softirq.c:682
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa9/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:preempt_schedule_irq+0xa5/0x120 kernel/sched/core.c:6942
Code: 44 24 20 00 02 00 00 43 c6 44 37 04 f8 74 0b 0f 0b 48 f7 03 08 00 00 00 74 4d bf 01 00 00 00 e8 21 8d 94 fc fb bf 01 00 00 00 <e8> 76 e4 ff ff fa bf 01 00 00 00 e8 bb 8e 94 fc 65 48 8b 1d 13 37
RSP: 0018:ffffc900018a7800 EFLAGS: 00000246
RAX: 1ffff110243f4646 RBX: ffffc900018a78d8 RCX: ffffffff870ccf00
RDX: 0000000000400140 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffffc900018a7888 R08: ffffffff870c5008 R09: ffffffff870c5018
R10: ffffffff870c5003 R11: 1ffffffff0e18a00 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000314f00
 irqentry_exit_cond_resched+0x29/0x30 kernel/entry/common.c:398
 irqentry_exit+0x37/0x40 kernel/entry/common.c:432
 sysvec_apic_timer_interrupt+0x64/0xc0 arch/x86/kernel/apic/apic.c:1108
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:arch_stack_walk+0x111/0x140 arch/x86/kernel/stacktrace.c:30
Code: 89 ff e8 e2 5b 05 00 48 85 c0 74 1e 48 89 df 48 89 c6 41 ff d6 84 c0 74 11 4c 89 ff e8 f8 5c 05 00 83 bd 78 ff ff ff 00 75 d5 <65> 48 8b 04 25 28 00 00 00 48 3b 45 d8 75 0d 48 83 c4 68 5b 41 5c
RSP: 0018:ffffc900018a7988 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc900018a7a40 RCX: ffff888121fa2700
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888121fa2780
RBP: ffffc900018a7a10 R08: ffffc900018a7a50 R09: ffffc900018a7a48
R10: 000000000000000b R11: fffff52000314f3d R12: ffff888121fa2780
R13: dffffc0000000000 R14: ffffffff8159baa0 R15: ffffc900018a7988
 stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122
 kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348
 kasan_record_aux_stack+0xe/0x10 mm/kasan/generic.c:353
 task_work_add+0x27/0x1e0 kernel/task_work.c:38
 fput_many+0xe7/0x1a0 fs/file_table.c:367
 fput+0x1a/0x20 fs/file_table.c:383
 filp_close+0x105/0x150 fs/open.c:1352
 __range_close fs/file.c:691 [inline]
 __close_range+0x25f/0x430 fs/file.c:746
 __do_sys_close_range fs/open.c:1391 [inline]
 __se_sys_close_range fs/open.c:1388 [inline]
 __x64_sys_close_range+0x7a/0x90 fs/open.c:1388
 x64_sys_call+0x48f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:437
 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: 0033:0x7f43b4558159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff2d1f46c8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 00007fff2d1f47b0 RCX: 00007f43b4558159
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 0000000000037b31 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b33020000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f43b47dffac R14: 00007f43b47dffa8 R15: 00007f43b47dffa0
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 588 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:queued_write_lock_slowpath+0x12e/0x270 kernel/locking/qrwlock.c:78
Code: 01 00 00 43 0f b6 04 27 84 c0 74 37 44 89 f1 80 e1 07 80 c1 03 38 c1 7c 2a 4c 89 f7 e8 7b 2b 59 00 eb 20 f3 90 43 0f b6 04 27 <84> c0 74 15 44 89 f1 80 e1 07 80 c1 03 38 c1 7c 08 4c 89 f7 e8 59
RSP: 0018:ffffc90000bc76a0 EFLAGS: 00000206
RAX: 0000000000000000 RBX: ffffc90000bc76f0 RCX: ffffffff815011df
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff86d92d68
RBP: ffffc90000bc7750 R08: ffffffff86d92d6b R09: 1ffffffff0db25ad
R10: dffffc0000000000 R11: fffffbfff0db25ae R12: dffffc0000000000
R13: 1ffff92000178ed8 R14: ffffffff86d92d68 R15: 1ffffffff0db25ad
FS:  000055555b3ec500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3f5958fe60 CR3: 000000012af57000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 queued_write_lock include/asm-generic/qrwlock.h:97 [inline]
 __raw_write_lock_bh include/linux/rwlock_api_smp.h:204 [inline]
 _raw_write_lock_bh+0xe2/0xf0 kernel/locking/spinlock.c:324
 neigh_parms_alloc+0x306/0x4f0 net/core/neighbour.c:1647
 ipv6_add_dev+0x32d/0x1150 net/ipv6/addrconf.c:401
 addrconf_notify+0x582/0xe00 net/ipv6/addrconf.c:3610
 notifier_call_chain kernel/notifier.c:83 [inline]
 raw_notifier_call_chain+0x90/0x100 kernel/notifier.c:391
 call_netdevice_notifiers_info net/core/dev.c:2070 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2082 [inline]
 call_netdevice_notifiers+0x119/0x190 net/core/dev.c:2096
 register_netdevice+0x110a/0x1490 net/core/dev.c:10462
 register_netdev+0x3e/0x50 net/core/dev.c:10555
 loopback_net_init+0x74/0x150 drivers/net/loopback.c:216
 ops_init+0x2c0/0x470 net/core/net_namespace.c:138
 setup_net+0x331/0xa30 net/core/net_namespace.c:332
 copy_net_ns+0x355/0x5c0 net/core/net_namespace.c:476
 create_new_namespaces+0x3a8/0x660 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x120/0x170 kernel/nsproxy.c:226
 ksys_unshare+0x4d7/0x810 kernel/fork.c:3249
 __do_sys_unshare kernel/fork.c:3326 [inline]
 __se_sys_unshare kernel/fork.c:3324 [inline]
 __x64_sys_unshare+0x38/0x40 kernel/fork.c:3324
 x64_sys_call+0x442/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:273
 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: 0033:0x7f0f35fbf427
Code: 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 10 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe199314c8 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0f35fbf427
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 00007ffe19931520 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffe19931528
R13: 0000000000000002 R14: 00007ffe19931708 R15: 0000000000000000
 </TASK>