syzbot

watchdog: BUG: soft lockup - CPU#1 stuck for 123s! [swapper/1:0]
Modules linked in:
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.290-syzkaller-00002-g41adfeb3d639 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__read_once_size include/linux/compiler.h:268 [inline]
RIP: 0010:queued_write_lock_slowpath+0x180/0x390 kernel/locking/qrwlock.c:79
Code: 00 00 00 42 0f b6 04 33 84 c0 4c 8b 64 24 08 74 37 44 89 f9 80 e1 07 80 c1 03 38 c1 7c 2a 4c 89 ff e8 d4 d5 47 00 eb 20 f3 90 <42> 0f b6 04 33 84 c0 74 15 44 89 f9 80 e1 07 80 c1 03 38 c1 7c 08
RSP: 0018:ffff8881f6f09640 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
RAX: 00000000000001ff RBX: 1ffffffff0c8017d RCX: ffffffff814c5f1b
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff86400be8
RBP: ffff8881f6f096f0 R08: dffffc0000000000 R09: fffffbfff0c8017e
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff1103ede12d2
R13: 00000000000000ff R14: dffffc0000000000 R15: ffffffff86400be8
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdea661f58 CR3: 00000001ece7c000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff1 DR7: 0000000000000600
Call Trace:
 <IRQ>
 queued_write_lock include/asm-generic/qrwlock.h:95 [inline]
 __raw_write_lock_bh include/linux/rwlock_api_smp.h:204 [inline]
 _raw_write_lock_bh+0x10a/0x170 kernel/locking/spinlock.c:319
 neigh_forced_gc net/core/neighbour.c:237 [inline]
 neigh_alloc net/core/neighbour.c:430 [inline]
 ___neigh_create+0x202/0x1ae0 net/core/neighbour.c:592
 ip6_finish_output2+0x8b1/0x1640 net/ipv6/ip6_output.c:126
 NF_HOOK_COND include/linux/netfilter.h:292 [inline]
 ip6_output+0x1b3/0x430 net/ipv6/ip6_output.c:233
 dst_output include/net/dst.h:438 [inline]
 NF_HOOK include/linux/netfilter.h:303 [inline]
 mld_sendpack+0x606/0xb50 net/ipv6/mcast.c:1679
 mld_send_cr net/ipv6/mcast.c:1975 [inline]
 mld_ifc_timer_expire+0x814/0xc10 net/ipv6/mcast.c:2474
 call_timer_fn+0x36/0x390 kernel/time/timer.c:1448
 expire_timers kernel/time/timer.c:1493 [inline]
 __run_timers+0x879/0xbe0 kernel/time/timer.c:1817
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1830
 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x195/0x1c0 kernel/softirq.c:413
 reschedule_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:858
 </IRQ>
RIP: 0010:default_idle+0x1f/0x30 arch/x86/kernel/process.c:573
Code: 90 90 90 90 90 90 90 90 90 90 90 e8 8b af da fd bf 01 00 00 00 89 c6 e8 ef 93 d1 fc 0f 1f 44 00 00 0f 00 2d 23 a3 4d 00 fb f4 <e8> 6c af da fd bf ff ff ff ff 89 c6 e9 d0 93 d1 fc 41 57 41 56 53
RSP: 0018:ffff8881f5df7d78 EFLAGS: 000002d2 ORIG_RAX: ffffffffffffff02
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: ffff8881f5dc3f00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffff8881f5df7e80 R08: ffffffff8231cd01 R09: ffffed103ebb87e1
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffffff864c4d68
R13: ffff8881f5dc3f00 R14: 1ffff1103ebb87e0 R15: 0000000000000001
 default_idle_call kernel/sched/idle.c:94 [inline]
 cpuidle_idle_call kernel/sched/idle.c:154 [inline]
 do_idle+0x248/0x660 kernel/sched/idle.c:264
 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:356
 start_secondary+0x3a5/0x460 arch/x86/kernel/smpboot.c:277
 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 2836 Comm: syz.5.622 Not tainted 5.4.290-syzkaller-00002-g41adfeb3d639 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x50 kernel/kcov.c:186
Code: 00 00 00 0f 1f 00 be 0c 00 00 00 48 c7 c7 20 b1 f1 85 e8 5f e3 2f 00 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 8b 04 24 <65> 48 8b 0d 74 42 9e 7e 65 8b 15 79 42 9e 7e f7 c2 00 01 1f 00 74
RSP: 0018:ffff8881f6e094d0 EFLAGS: 00000046
RAX: ffffffff8231cf99 RBX: ffffffff84a64a60 RCX: ffffffff815170b4
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff84a64a60
RBP: ffff8881f6e28e00 R08: dffffc0000000000 R09: ffffed103edcb135
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffff8881db33eea8
FS:  00007f269870a6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f269a0a113f CR3: 00000001f34c3000 CR4: 00000000003406b0
DR0: 0040000100000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 __this_cpu_preempt_check+0x9/0x20 lib/smp_processor_id.c:63
 get_irq_regs arch/x86/include/asm/irq_regs.h:19 [inline]
 set_irq_regs arch/x86/include/asm/irq_regs.h:26 [inline]
 smp_apic_timer_interrupt+0x126/0x490 arch/x86/kernel/apic/apic.c:1163
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
RIP: 0010:slab_alloc_node mm/slub.c:2768 [inline]
RIP: 0010:slab_alloc mm/slub.c:2837 [inline]
RIP: 0010:__kmalloc_track_caller+0x79/0x2b0 mm/slub.c:4449
Code: 85 c0 74 07 31 db e9 b2 00 00 00 0f 1f 44 00 00 49 89 ed 4d 85 ed 74 ec 4c 89 3c 24 0f 1f 44 00 00 49 8b 45 00 65 48 8b 50 08 <49> 8b 45 00 65 48 03 05 eb 78 6e 7e 48 3b 50 08 75 e5 4c 8b 38 4d
RSP: 0018:ffff8881f6e095d0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 000000000005b140 RBX: 0000000000082a20 RCX: 0000000000000000
RDX: 0000000000056b30 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff8881f5c02280 R08: ffffffff8247139d R09: ffffffff8460320c
R10: ffffffff84800000 R11: dffffc0000000001 R12: 0000000000082a20
R13: ffff8881f5c02280 R14: 0000000000000240 R15: ffffffff8385316c
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0xb4/0x4d0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1080 [inline]
 nlmsg_new include/net/netlink.h:888 [inline]
 __neigh_notify+0x7c/0x130 net/core/neighbour.c:3371
 neigh_cleanup_and_release+0x2b/0x210 net/core/neighbour.c:102
 neigh_del net/core/neighbour.c:198 [inline]
 neigh_remove_one+0x350/0x3b0 net/core/neighbour.c:219
 neigh_forced_gc net/core/neighbour.c:252 [inline]
 neigh_alloc net/core/neighbour.c:430 [inline]
 ___neigh_create+0x3b3/0x1ae0 net/core/neighbour.c:592
 ip6_finish_output2+0x8b1/0x1640 net/ipv6/ip6_output.c:126
 NF_HOOK_COND include/linux/netfilter.h:292 [inline]
 ip6_output+0x1b3/0x430 net/ipv6/ip6_output.c:233
 dst_output include/net/dst.h:438 [inline]
 NF_HOOK include/linux/netfilter.h:303 [inline]
 ndisc_send_skb+0x702/0xc30 net/ipv6/ndisc.c:511
 addrconf_rs_timer+0x2d1/0x600 net/ipv6/addrconf.c:3955
 call_timer_fn+0x36/0x390 kernel/time/timer.c:1448
 expire_timers kernel/time/timer.c:1493 [inline]
 __run_timers+0x879/0xbe0 kernel/time/timer.c:1817
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1830
 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x195/0x1c0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:539 [inline]
 smp_apic_timer_interrupt+0x11a/0x490 arch/x86/kernel/apic/apic.c:1161
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
 </IRQ>
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x45/0x60 kernel/locking/spinlock.c:199
Code: 08 00 74 0c 48 c7 c7 90 3c eb 85 e8 05 02 3d fd 48 83 3d 5d 09 94 01 00 74 29 48 89 df e8 53 d4 f4 fc 66 90 fb bf 01 00 00 00 <e8> 86 be ed fc 65 8b 05 3b 5a ab 7b 85 c0 74 02 5b c3 e8 c4 20 a9
RSP: 0018:ffff8881db33ef50 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000001 RBX: ffff8881f6e57b40 RCX: dffffc0000000000
RDX: 0000000040000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffff8881db33efb0 R08: ffffffff8179a5d9 R09: fffffbfff0c98a8b
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881f6e57b40
R13: ffff8881decaee40 R14: dffffc0000000000 R15: 0000000000000000
 finish_lock_switch kernel/sched/core.c:3347 [inline]
 finish_task_switch+0x130/0x590 kernel/sched/core.c:3447
 context_switch kernel/sched/core.c:3611 [inline]
 __schedule+0xb0d/0x1320 kernel/sched/core.c:4307
 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:4456
 preempt_schedule+0xd9/0xe0 kernel/sched/core.c:4481
 ___preempt_schedule+0x16/0x20 arch/x86/entry/thunk_64.S:50
 unwind_next_frame+0x19c2/0x1ea0 arch/x86/kernel/unwind_orc.c:603
 arch_stack_walk+0x111/0x140 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x118/0x1c0 kernel/stacktrace.c:123
 save_stack+0x95/0x880 mm/page_owner.c:122
 __reset_page_owner+0x1f/0x100 mm/page_owner.c:149
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1176 [inline]
 free_pcp_prepare mm/page_alloc.c:1233 [inline]
 free_unref_page_prepare+0x297/0x380 mm/page_alloc.c:3085
 free_unref_page mm/page_alloc.c:3134 [inline]
 free_the_page mm/page_alloc.c:4953 [inline]
 __free_pages+0xaf/0x140 mm/page_alloc.c:4961
 __vunmap+0x75b/0x890 mm/vmalloc.c:2260
 kcov_put kernel/kcov.c:396 [inline]
 kcov_close+0x27/0x50 kernel/kcov.c:495
 __fput+0x262/0x680 fs/file_table.c:281
 task_work_run+0x140/0x170 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0xcaf/0x2bc0 kernel/exit.c:861
 do_group_exit+0x138/0x300 kernel/exit.c:984
 get_signal+0xdb1/0x1440 kernel/signal.c:2738
 do_signal+0xb0/0x11f0 arch/x86/kernel/signal.c:809
 exit_to_usermode_loop+0xc0/0x1a0 arch/x86/entry/common.c:159
 prepare_exit_to_usermode+0x199/0x200 arch/x86/entry/common.c:194
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f269a0a1169
Code: Bad RIP value.
RSP: 002b:00007f269870a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 00007f269a2c8fa0 RCX: 00007f269a0a1169
RDX: 00002000000015c0 RSI: 0000000000005452 RDI: 0000000000000003
RBP: 00007f269a123a68 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f269a2c8fa0 R15: 00007ffeb94832b8