[ 92.260075][ T27] audit: type=1800 audit(1581423298.703:26): pid=9717 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 93.379535][ T27] kauditd_printk_skb: 2 callbacks suppressed [ 93.379547][ T27] audit: type=1800 audit(1581423299.843:29): pid=9717 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 93.406285][ T27] audit: type=1800 audit(1581423299.843:30): pid=9717 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.1.22' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 369.908092][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 369.916359][ C1] rcu: 1-....: (10500 ticks this GP) idle=ffa/1/0x4000000000000002 softirq=17285/17285 fqs=5250 [ 369.928825][ C1] (t=10502 jiffies g=9577 q=235) [ 369.934638][ C1] NMI backtrace for cpu 1 [ 369.939147][ C1] CPU: 1 PID: 9872 Comm: syz-executor437 Not tainted 5.6.0-rc1-next-20200211-syzkaller #0 [ 369.950178][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 369.961252][ C1] Call Trace: [ 369.965072][ C1] [ 369.968173][ C1] dump_stack+0x197/0x210 [ 369.973023][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 369.978885][ C1] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 369.984779][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 369.992067][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 369.998676][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 370.003854][ C1] rcu_sched_clock_irq.cold+0x51a/0xc3d [ 370.010115][ C1] ? raise_softirq+0x138/0x340 [ 370.015832][ C1] update_process_times+0x2d/0x70 [ 370.021789][ C1] tick_sched_handle+0xa2/0x190 [ 370.028232][ C1] tick_sched_timer+0x53/0x140 [ 370.033694][ C1] __hrtimer_run_queues+0x364/0xe40 [ 370.039741][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 370.045810][ C1] ? hrtimer_init+0x330/0x330 [ 370.051517][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 370.057798][ C1] ? ktime_get_update_offsets_now+0x2ce/0x430 [ 370.064421][ C1] hrtimer_interrupt+0x314/0x770 [ 370.069999][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 370.076379][ C1] apic_timer_interrupt+0xf/0x20 [ 370.081542][ C1] [ 370.084690][ C1] RIP: 0010:lock_is_held_type+0x272/0x320 [ 370.091033][ C1] Code: ff df c7 83 9c 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 88 00 00 00 48 83 3d 5e 11 59 08 00 74 31 48 8b 7d c0 57 9d <0f> 1f 44 00 00 48 83 c4 20 44 89 e0 5b 41 5c 41 5d 41 5e 41 5f 5d [ 370.113616][ C1] RSP: 0018:ffffc90001ea6eb8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 370.123334][ C1] RAX: 1ffffffff13676b7 RBX: ffff888094af0340 RCX: ffff888094af0be0 [ 370.132347][ C1] RDX: dffffc0000000000 RSI: ffff8880a3e06338 RDI: 0000000000000286 [ 370.141424][ C1] RBP: ffffc90001ea6f00 R08: ffff888094af0340 R09: ffffc90001ea6f28 [ 370.149852][ C1] R10: fffff520003d4de7 R11: ffffc90001ea6f3f R12: 0000000000000001 [ 370.158220][ C1] R13: ffff888094af0c08 R14: ffff8880a3e06338 R15: 0000000000000001 [ 370.166640][ C1] hash_ip4_del+0xa3a/0xce0 [ 370.171750][ C1] ? retint_kernel+0x2b/0x2b [ 370.177439][ C1] hash_ip4_uadt+0x546/0x7a0 [ 370.183897][ C1] ? hash_ip6_del+0xe70/0xe70 [ 370.188737][ C1] ? hash_ip6_uadt+0x670/0x670 [ 370.194505][ C1] ? __kasan_check_write+0x14/0x20 [ 370.200689][ C1] call_ad+0x1a0/0x5a0 [ 370.205541][ C1] ? start_msg+0x220/0x220 [ 370.210107][ C1] ? nla_memcpy+0xb0/0xb0 [ 370.215225][ C1] ? __nla_parse+0x43/0x60 [ 370.219937][ C1] ip_set_ad.isra.0+0x572/0xb20 [ 370.225565][ C1] ? ip_set_dump_start+0x6f0/0x6f0 [ 370.231316][ C1] ? nla_memcpy+0xb0/0xb0 [ 370.236225][ C1] ? lock_downgrade+0x920/0x920 [ 370.241404][ C1] ip_set_udel+0x3a/0x50 [ 370.246520][ C1] ? ip_set_ad.isra.0+0xb20/0xb20 [ 370.252278][ C1] nfnetlink_rcv_msg+0xcf2/0xfb0 [ 370.257364][ C1] ? nfnetlink_bind+0x2c0/0x2c0 [ 370.263109][ C1] ? __kasan_check_read+0x11/0x20 [ 370.268574][ C1] ? __lock_acquire+0x8a0/0x4a00 [ 370.273954][ C1] ? save_stack+0x5c/0x90 [ 370.278392][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 370.285612][ C1] ? apparmor_capable+0x4df/0x910 [ 370.291374][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 370.298505][ C1] ? __kasan_check_read+0x11/0x20 [ 370.304479][ C1] ? apparmor_cred_prepare+0x7b0/0x7b0 [ 370.310321][ C1] netlink_rcv_skb+0x177/0x450 [ 370.315578][ C1] ? nfnetlink_bind+0x2c0/0x2c0 [ 370.321319][ C1] ? netlink_ack+0xb50/0xb50 [ 370.326574][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 370.334019][ C1] ? ns_capable_common+0x93/0x100 [ 370.340168][ C1] ? ns_capable+0x20/0x30 [ 370.344851][ C1] ? __netlink_ns_capable+0x104/0x140 [ 370.351135][ C1] nfnetlink_rcv+0x1ba/0x460 [ 370.356581][ C1] ? nfnetlink_rcv_batch+0x1790/0x1790 [ 370.362904][ C1] ? netlink_deliver_tap+0x248/0xbf0 [ 370.369160][ C1] ? __kasan_check_write+0x14/0x20 [ 370.374778][ C1] netlink_unicast+0x59e/0x7e0 [ 370.379679][ C1] ? netlink_attachskb+0x870/0x870 [ 370.385538][ C1] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 370.392204][ C1] ? __check_object_size+0x3d/0x437 [ 370.398409][ C1] netlink_sendmsg+0x91c/0xea0 [ 370.403989][ C1] ? netlink_unicast+0x7e0/0x7e0 [ 370.409332][ C1] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 370.415718][ C1] ? apparmor_socket_sendmsg+0x2a/0x30 [ 370.421796][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 370.428802][ C1] ? security_socket_sendmsg+0x8d/0xc0 [ 370.434724][ C1] ? netlink_unicast+0x7e0/0x7e0 [ 370.441450][ C1] sock_sendmsg+0xd7/0x130 [ 370.446192][ C1] ____sys_sendmsg+0x753/0x880 [ 370.451045][ C1] ? kernel_sendmsg+0x50/0x50 [ 370.456294][ C1] ? lockdep_init_map+0x1be/0x6d0 [ 370.462301][ C1] ___sys_sendmsg+0x100/0x170 [ 370.467809][ C1] ? sendmsg_copy_msghdr+0x70/0x70 [ 370.473386][ C1] ? __kasan_check_read+0x11/0x20 [ 370.478951][ C1] ? __lock_acquire+0x8a0/0x4a00 [ 370.484368][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 370.492156][ C1] ? __this_cpu_preempt_check+0x35/0x190 [ 370.499209][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 370.505761][ C1] ? percpu_counter_add_batch+0x13c/0x190 [ 370.512198][ C1] ? __fd_install+0x1bc/0x640 [ 370.517110][ C1] ? find_held_lock+0x35/0x130 [ 370.522357][ C1] ? __fd_install+0x1bc/0x640 [ 370.528238][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 370.535623][ C1] ? __fget_light+0x1ad/0x270 [ 370.541311][ C1] ? __fdget+0x1b/0x20 [ 370.545964][ C1] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 370.552518][ C1] __sys_sendmsg+0x105/0x1d0 [ 370.557631][ C1] ? __sys_sendmsg_sock+0xc0/0xc0 [ 370.563002][ C1] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 370.568935][ C1] ? do_syscall_64+0x26/0x790 [ 370.573975][ C1] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 370.581228][ C1] ? do_syscall_64+0x26/0x790 [ 370.587316][ C1] __x64_sys_sendmsg+0x78/0xb0 [ 370.593166][ C1] do_syscall_64+0xfa/0x790 [ 370.598350][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 370.604805][ C1] RIP: 0033:0x440509 [ 370.609146][ C1] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 370.631287][ C1] RSP: 002b:00007ffdb631b258 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 370.641065][ C1] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440509 [ 370.649538][ C1] RDX: 0000000000000040 RSI: 0000000020000080 RDI: 0000000000000004 [ 370.658790][ C1] RBP: 00000000006ca018 R08: 0000000000000018 R09: 00000000004002c8 [ 370.667082][ C1] R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000401d90 [ 370.675814][ C1] R13: 0000000000401e20 R14: 0000000000000000 R15: 0000000000000000