syzbot

watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.4.31:479]
Modules linked in:
CPU: 0 PID: 479 Comm: syz.4.31 Not tainted 5.15.169-syzkaller-00085-g548ca9fbf844 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:check_kcov_mode kernel/kcov.c:172 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x27/0x60 kernel/kcov.c:206
Code: 5d c3 cc 55 48 89 e5 48 8b 45 08 65 48 8b 0d 60 07 92 7e 65 8b 15 61 07 92 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 <83> b9 5c 0b 00 00 00 74 2c 8b 91 38 0b 00 00 83 fa 02 75 21 48 8b
RSP: 0018:ffffc90000007318 EFLAGS: 00000246
RAX: ffffffff83e1250d RBX: ffff888135818e98 RCX: ffff888112f84f00
RDX: 0000000000000100 RSI: ffffc90000007280 RDI: ffff888135818dc0
RBP: ffffc90000007318 R08: 0000000000000002 R09: 000000000000001f
R10: ffffc90000006ed0 R11: dffffc0000000001 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff888135818dc0 R15: ffff888135818dc0
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1b1497ac90 CR3: 000000012b3c2000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 kfree_skbmem+0x1d/0x170 net/core/skbuff.c:696
 __kfree_skb net/core/skbuff.c:758 [inline]
 consume_skb+0xb4/0x250 net/core/skbuff.c:930
 netlink_broadcast_filtered+0x10f4/0x1220 net/netlink/af_netlink.c:1540
 netlink_broadcast net/netlink/af_netlink.c:1562 [inline]
 nlmsg_multicast include/net/netlink.h:1033 [inline]
 nlmsg_notify+0x101/0x1c0 net/netlink/af_netlink.c:2551
 rtnl_notify+0x9c/0xd0 net/core/rtnetlink.c:759
 __neigh_notify+0xcc/0x120 net/core/neighbour.c:3386
 neigh_cleanup_and_release+0x2c/0x1b0 net/core/neighbour.c:101
 neigh_del net/core/neighbour.c:197 [inline]
 neigh_remove_one+0x3a6/0x430 net/core/neighbour.c:218
 neigh_forced_gc net/core/neighbour.c:251 [inline]
 neigh_alloc net/core/neighbour.c:429 [inline]
 ___neigh_create+0x474/0x1bd0 net/core/neighbour.c:591
 __neigh_create+0x32/0x40 net/core/neighbour.c:679
 ip6_finish_output2+0x9ee/0x16f0 net/ipv6/ip6_output.c:127
 __ip6_finish_output+0x60f/0x7c0 net/ipv6/ip6_output.c:201
 ip6_finish_output+0x31/0x210 net/ipv6/ip6_output.c:211
 NF_HOOK_COND include/linux/netfilter.h:294 [inline]
 ip6_output+0x1f7/0x4c0 net/ipv6/ip6_output.c:234
 dst_output include/net/dst.h:444 [inline]
 NF_HOOK include/linux/netfilter.h:305 [inline]
 ndisc_send_skb+0x73e/0xc90 net/ipv6/ndisc.c:511
 ndisc_send_rs+0x532/0x6a0 net/ipv6/ndisc.c:705
 addrconf_rs_timer+0x2d1/0x600 net/ipv6/addrconf.c:3979
 call_timer_fn+0x3b/0x2d0 kernel/time/timer.c:1457
 expire_timers kernel/time/timer.c:1502 [inline]
 __run_timers+0x72a/0xa10 kernel/time/timer.c:1773
 run_timer_softirq+0x69/0xf0 kernel/time/timer.c:1786
 handle_softirqs+0x25e/0x5c0 kernel/softirq.c:565
 __do_softirq kernel/softirq.c:603 [inline]
 invoke_softirq kernel/softirq.c:425 [inline]
 __irq_exit_rcu+0x52/0xf0 kernel/softirq.c:652
 irq_exit_rcu+0x9/0x10 kernel/softirq.c:664
 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:page_ext_put+0x1/0x30 mm/page_ext.c:168
Code: af 3d d3 fd 0d 05 4d 01 fe eb 08 e8 b9 18 b8 ff 45 31 f6 4c 89 f0 5b 41 5c 41 5e 41 5f 5d c3 e8 a5 18 b8 ff eb 9a 0f 1f 00 55 <48> 89 e5 53 48 89 fb e8 93 18 b8 ff 48 85 db 74 0d e8 89 18 b8 ff
RSP: 0018:ffffc90000fff618 EFLAGS: 00000293
RAX: ffffffff81b7b03b RBX: ffff8881042634b0 RCX: ffff888112f84f00
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8881042634b0
RBP: ffffc90000fff670 R08: dffffc0000000000 R09: ffffed102084c691
R10: 0000000000000000 R11: dffffc0000000001 R12: 00000000ffffffff
R13: ffff8881042634a0 R14: dffffc0000000000 R15: 0000000000000000
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1472 [inline]
 free_pcp_prepare mm/page_alloc.c:1544 [inline]
 free_unref_page_prepare+0x7c8/0x7d0 mm/page_alloc.c:3534
 free_unref_page+0xe8/0x750 mm/page_alloc.c:3616
 free_the_page mm/page_alloc.c:805 [inline]
 __free_pages+0x61/0xf0 mm/page_alloc.c:5855
 __vunmap+0x7bc/0x8f0 mm/vmalloc.c:2652
 __vfree mm/vmalloc.c:2700 [inline]
 vfree+0x7f/0xb0 mm/vmalloc.c:2731
 kcov_put kernel/kcov.c:417 [inline]
 kcov_close+0x2b/0x50 kernel/kcov.c:519
 __fput+0x228/0x8c0 fs/file_table.c:280
 ____fput+0x15/0x20 fs/file_table.c:308
 task_work_run+0x129/0x190 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xc48/0x2ca0 kernel/exit.c:880
 do_group_exit+0x141/0x310 kernel/exit.c:1002
 get_signal+0x7a3/0x1630 kernel/signal.c:2907
 arch_do_signal_or_restart+0xbd/0x1680 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0xa0/0xe0 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:214
 irqentry_exit_to_user_mode+0x9/0x10 kernel/entry/common.c:320
 irqentry_exit+0x12/0x40 kernel/entry/common.c:411
 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: 0033:0x7fc5a2912849
Code: Unable to access opcode bytes at RIP 0x7fc5a291281f.
RSP: 002b:00007fc5a0f890e8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007fc5a2ad7fa8 RCX: 00007fc5a2912849
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fc5a2ad7fa8
RBP: 00007fc5a2ad7fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc5a2ad7fac
R13: 0000000000000000 R14: 00007ffd11bf1c90 R15: 00007ffd11bf1d78
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 15 Comm: rcub/0 Not tainted 5.15.169-syzkaller-00085-g548ca9fbf844 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:constant_test_bit arch/x86/include/asm/bitops.h:207 [inline]
RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:135 [inline]
RIP: 0010:test_ti_thread_flag include/linux/thread_info.h:118 [inline]
RIP: 0010:need_resched include/linux/sched.h:2155 [inline]
RIP: 0010:rtmutex_spin_on_owner kernel/locking/rtmutex.c:1426 [inline]
RIP: 0010:rt_mutex_slowlock_block+0x2ee/0x5a0 kernel/locking/rtmutex.c:1560
Code: 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 e5 00 00 00 83 3b 00 0f 84 16 01 00 00 4c 89 ef be 08 00 00 00 e8 f5 05 cc fc 4c 89 e8 <48> c1 e8 03 42 80 3c 20 00 74 08 4c 89 ef e8 ff 03 cc fc 49 f7 45
RSP: 0018:ffffc900000f7bf0 EFLAGS: 00000256
RAX: ffff88810026e2c0 RBX: ffff888112f84f34 RCX: ffffffff84e6ba1b
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88810026e2c0
RBP: ffffc900000f7c90 R08: dffffc0000000000 R09: ffffed102004dc59
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff88810026e2c0 R14: ffffffff86bab4b8 R15: ffffc900000f7ce0
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0bd3860038 CR3: 000000013d3d6000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 __rt_mutex_slowlock kernel/locking/rtmutex.c:1629 [inline]
 __rt_mutex_slowlock_locked kernel/locking/rtmutex.c:1662 [inline]
 rt_mutex_slowlock+0x184/0x300 kernel/locking/rtmutex.c:1691
 __rt_mutex_lock kernel/locking/rtmutex.c:1703 [inline]
 __rt_mutex_lock_common kernel/locking/rtmutex_api.c:30 [inline]
 rt_mutex_lock+0x14a/0x210 kernel/locking/rtmutex_api.c:66
 rcu_boost kernel/rcu/tree_plugin.h:1060 [inline]
 rcu_boost_kthread+0x231/0x6e0 kernel/rcu/tree_plugin.h:1085
 kthread+0x421/0x510 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>