[ 86.681517][ T27] audit: type=1800 audit(1581499234.702:27): pid=9981 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 86.739408][ T27] audit: type=1800 audit(1581499234.742:28): pid=9981 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 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. [ 87.565981][ T27] audit: type=1800 audit(1581499235.662:29): pid=9981 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 [ 87.587755][ T27] audit: type=1800 audit(1581499235.662:30): pid=9981 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 '10.128.10.14' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 352.379759][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 352.387011][ C1] rcu: 1-....: (10499 ticks this GP) idle=75a/1/0x4000000000000002 softirq=15925/15925 fqs=5250 [ 352.398347][ C1] (t=10501 jiffies g=9861 q=60) [ 352.403292][ C1] NMI backtrace for cpu 1 [ 352.407627][ C1] CPU: 1 PID: 10137 Comm: syz-executor705 Not tainted 5.6.0-rc1-next-20200212-syzkaller #0 [ 352.417696][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 352.428102][ C1] Call Trace: [ 352.431377][ C1] [ 352.434980][ C1] dump_stack+0x197/0x210 [ 352.439560][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 352.444836][ C1] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 352.450475][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 352.456465][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 352.462433][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 352.467568][ C1] rcu_sched_clock_irq.cold+0x51a/0xc3d [ 352.473181][ C1] ? raise_softirq+0x138/0x340 [ 352.477997][ C1] update_process_times+0x2d/0x70 [ 352.483266][ C1] tick_sched_handle+0xa2/0x190 [ 352.488117][ C1] tick_sched_timer+0x53/0x140 [ 352.492985][ C1] __hrtimer_run_queues+0x364/0xe40 [ 352.498327][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 352.503734][ C1] ? hrtimer_init+0x330/0x330 [ 352.508930][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 352.514674][ C1] ? ktime_get_update_offsets_now+0x2ce/0x430 [ 352.520803][ C1] hrtimer_interrupt+0x314/0x770 [ 352.525837][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 352.531522][ C1] apic_timer_interrupt+0xf/0x20 [ 352.536452][ C1] [ 352.539439][ C1] RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 [ 352.545557][ C1] Code: ff cc cc cc cc cc cc cc cc cc 65 48 8b 04 25 c0 1e 02 00 48 8b 80 a0 13 00 00 c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 <55> 48 89 e5 65 48 8b 04 25 c0 1e 02 00 65 8b 15 d4 50 8c 7e 81 e2 [ 352.565363][ C1] RSP: 0018:ffffc90004da6f08 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 352.573924][ C1] RAX: ffffffff86909800 RBX: ffff8880a260c800 RCX: ffffc90004da7050 [ 352.581903][ C1] RDX: ffffc90004da7050 RSI: ffffc90004da7030 RDI: ffff8880a260c800 [ 352.589879][ C1] RBP: ffffc90004da6fb0 R08: 0000000000000001 R09: ffffc90004da6f28 [ 352.597859][ C1] R10: fffff520009b4de7 R11: ffffc90004da6f3f R12: ffffc90004da7050 [ 352.605854][ C1] R13: 00000000bfffffff R14: ffffc90004da7030 R15: ffffc90004da7030 [ 352.614127][ C1] ? hash_ip6_del+0xe70/0xe70 [ 352.618824][ C1] ? hash_ip4_del+0x20/0xce0 [ 352.623427][ C1] ? retint_kernel+0x2b/0x2b [ 352.628035][ C1] hash_ip4_uadt+0x546/0x7a0 [ 352.632751][ C1] ? hash_ip6_del+0xe70/0xe70 [ 352.637436][ C1] ? hash_ip6_uadt+0x670/0x670 [ 352.642429][ C1] ? __kasan_check_write+0x14/0x20 [ 352.647736][ C1] ? __kasan_check_read+0x11/0x20 [ 352.652814][ C1] call_ad+0x1a0/0x5a0 [ 352.656876][ C1] ? start_msg+0x220/0x220 [ 352.661349][ C1] ? nla_memcpy+0xb0/0xb0 [ 352.665675][ C1] ? __nla_parse+0x43/0x60 [ 352.670097][ C1] ip_set_ad.isra.0+0x572/0xb20 [ 352.674962][ C1] ? ip_set_dump_start+0x6f0/0x6f0 [ 352.680104][ C1] ? nla_memcpy+0xb0/0xb0 [ 352.684491][ C1] ? lock_downgrade+0x920/0x920 [ 352.689335][ C1] ip_set_udel+0x3a/0x50 [ 352.693702][ C1] ? ip_set_ad.isra.0+0xb20/0xb20 [ 352.698914][ C1] nfnetlink_rcv_msg+0xcf2/0xfb0 [ 352.703871][ C1] ? nfnetlink_bind+0x2c0/0x2c0 [ 352.708718][ C1] ? __kasan_check_read+0x11/0x20 [ 352.713739][ C1] ? mark_lock+0xc2/0x1220 [ 352.718232][ C1] ? netlink_sendmsg+0xa1b/0xea0 [ 352.723174][ C1] ? __kasan_check_read+0x11/0x20 [ 352.728204][ C1] ? mark_lock+0xc2/0x1220 [ 352.732621][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 352.738930][ C1] ? apparmor_capable+0x4df/0x910 [ 352.743966][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 352.750255][ C1] ? apparmor_cred_prepare+0x7b0/0x7b0 [ 352.755713][ C1] netlink_rcv_skb+0x177/0x450 [ 352.760512][ C1] ? nfnetlink_bind+0x2c0/0x2c0 [ 352.765423][ C1] ? netlink_ack+0xb50/0xb50 [ 352.770203][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 352.776767][ C1] ? ns_capable_common+0x93/0x100 [ 352.781800][ C1] ? ns_capable+0x20/0x30 [ 352.786122][ C1] ? __netlink_ns_capable+0x104/0x140 [ 352.791487][ C1] nfnetlink_rcv+0x1ba/0x460 [ 352.796082][ C1] ? nfnetlink_rcv_batch+0x1790/0x1790 [ 352.801538][ C1] ? netlink_deliver_tap+0x248/0xbf0 [ 352.806839][ C1] ? __kasan_check_write+0x14/0x20 [ 352.811952][ C1] netlink_unicast+0x59e/0x7e0 [ 352.816712][ C1] ? netlink_attachskb+0x870/0x870 [ 352.821830][ C1] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 352.827885][ C1] ? __check_object_size+0x3d/0x437 [ 352.833094][ C1] netlink_sendmsg+0x91c/0xea0 [ 352.837880][ C1] ? netlink_unicast+0x7e0/0x7e0 [ 352.842878][ C1] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 352.848439][ C1] ? apparmor_socket_sendmsg+0x2a/0x30 [ 352.853896][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 352.860248][ C1] ? security_socket_sendmsg+0x8d/0xc0 [ 352.865982][ C1] ? netlink_unicast+0x7e0/0x7e0 [ 352.870986][ C1] sock_sendmsg+0xd7/0x130 [ 352.875426][ C1] ____sys_sendmsg+0x753/0x880 [ 352.880203][ C1] ? kernel_sendmsg+0x50/0x50 [ 352.884899][ C1] ? lockdep_init_map+0x1be/0x6d0 [ 352.890094][ C1] ___sys_sendmsg+0x100/0x170 [ 352.894787][ C1] ? sendmsg_copy_msghdr+0x70/0x70 [ 352.899997][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 352.906285][ C1] ? __this_cpu_preempt_check+0x35/0x190 [ 352.912200][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 352.918463][ C1] ? percpu_counter_add_batch+0x13c/0x190 [ 352.924248][ C1] ? __fd_install+0x1bc/0x640 [ 352.929046][ C1] ? find_held_lock+0x35/0x130 [ 352.933806][ C1] ? __fd_install+0x1bc/0x640 [ 352.938555][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 352.944837][ C1] ? __fget_light+0x1ad/0x270 [ 352.949507][ C1] ? __fdget+0x1b/0x20 [ 352.953591][ C1] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 352.959849][ C1] __sys_sendmsg+0x105/0x1d0 [ 352.964432][ C1] ? __sys_sendmsg_sock+0xc0/0xc0 [ 352.969538][ C1] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 352.975001][ C1] ? do_syscall_64+0x26/0x790 [ 352.979679][ C1] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 352.985743][ C1] ? do_syscall_64+0x26/0x790 [ 352.990588][ C1] __x64_sys_sendmsg+0x78/0xb0 [ 352.995418][ C1] do_syscall_64+0xfa/0x790 [ 353.000046][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 353.005955][ C1] RIP: 0033:0x440509 [ 353.009857][ 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 [ 353.029463][ C1] RSP: 002b:00007fff3028a4f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 353.037878][ C1] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440509 [ 353.045855][ C1] RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000004 [ 353.053834][ C1] RBP: 00000000006ca018 R08: 0000000000000018 R09: 00000000004002c8 [ 353.061852][ C1] R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000401d90 [ 353.069883][ C1] R13: 0000000000401e20 R14: 0000000000000000 R15: 0000000000000000