[ 83.877344][ T27] audit: type=1800 audit(1579935071.022:26): pid=9437 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. [ 84.911168][ T27] kauditd_printk_skb: 2 callbacks suppressed [ 84.911179][ T27] audit: type=1800 audit(1579935072.072:29): pid=9437 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 [ 84.939097][ T27] audit: type=1800 audit(1579935072.082:30): pid=9437 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 '10.128.0.203' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 269.401024][ T9594] Set syz2 is full, maxelem 65536 reached [ 374.432438][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 374.439151][ C1] rcu: 1-...!: (1 GPs behind) idle=79a/1/0x4000000000000002 softirq=15568/15569 fqs=6 [ 374.449029][ C1] (t=10502 jiffies g=8801 q=14) [ 374.453962][ C1] rcu: rcu_preempt kthread starved for 10491 jiffies! g8801 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 [ 374.465419][ C1] rcu: RCU grace-period kthread stack dump: [ 374.471362][ C1] rcu_preempt I29264 10 2 0x80004000 [ 374.477946][ C1] Call Trace: [ 374.481389][ C1] __schedule+0x934/0x1f90 [ 374.485843][ C1] ? __sched_text_start+0x8/0x8 [ 374.490700][ C1] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 374.496525][ C1] ? schedule_timeout+0x47c/0xc50 [ 374.501603][ C1] ? lockdep_hardirqs_on+0x421/0x5e0 [ 374.506891][ C1] schedule+0xdc/0x2b0 [ 374.510946][ C1] schedule_timeout+0x486/0xc50 [ 374.515781][ C1] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 374.521586][ C1] ? usleep_range+0x170/0x170 [ 374.526324][ C1] ? trace_hardirqs_on+0x67/0x240 [ 374.531400][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 374.536961][ C1] ? swake_up_one+0x60/0x60 [ 374.541510][ C1] rcu_gp_kthread+0x9b2/0x18d0 [ 374.546266][ C1] ? rcu_barrier+0x350/0x350 [ 374.550951][ C1] ? trace_hardirqs_on+0x67/0x240 [ 374.556065][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 374.562383][ C1] ? __kthread_parkme+0x108/0x1c0 [ 374.567545][ C1] ? __kasan_check_read+0x11/0x20 [ 374.572612][ C1] kthread+0x361/0x430 [ 374.576666][ C1] ? rcu_barrier+0x350/0x350 [ 374.581292][ C1] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 374.587005][ C1] ret_from_fork+0x24/0x30 [ 374.591435][ C1] NMI backtrace for cpu 1 [ 374.595825][ C1] CPU: 1 PID: 9595 Comm: syz-executor483 Not tainted 5.5.0-rc6-syzkaller #0 [ 374.604612][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 374.614657][ C1] Call Trace: [ 374.617928][ C1] [ 374.620861][ C1] dump_stack+0x197/0x210 [ 374.625184][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 374.630486][ C1] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 374.636142][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 374.642124][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 374.648001][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 374.653115][ C1] rcu_sched_clock_irq.cold+0x509/0xc0d [ 374.658709][ C1] ? raise_softirq+0x138/0x340 [ 374.663480][ C1] update_process_times+0x2d/0x70 [ 374.668565][ C1] tick_sched_handle+0xa2/0x190 [ 374.673402][ C1] tick_sched_timer+0x53/0x140 [ 374.678171][ C1] __hrtimer_run_queues+0x364/0xe40 [ 374.683365][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 374.688667][ C1] ? hrtimer_init+0x330/0x330 [ 374.693343][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 374.699063][ C1] ? ktime_get_update_offsets_now+0x2ce/0x430 [ 374.705116][ C1] hrtimer_interrupt+0x314/0x770 [ 374.710045][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 374.715594][ C1] apic_timer_interrupt+0xf/0x20 [ 374.720509][ C1] [ 374.723498][ C1] RIP: 0010:hash_ip4_expire.isra.0+0x1ee/0x8d0 [ 374.729649][ C1] Code: 4e 10 4c 89 f0 31 db 48 83 c0 20 48 89 4d d0 48 89 85 68 ff ff ff 49 89 c4 c7 45 a8 00 00 00 00 e9 d3 00 00 00 e8 22 61 fe fa <48> 8b 45 a0 80 38 00 0f 85 9c 05 00 00 49 8b bd 98 00 00 00 4c 01 [ 374.749249][ C1] RSP: 0018:ffffc90001fa6e28 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 [ 374.758087][ C1] RAX: ffff888098ec4380 RBX: 0000000000000000 RCX: ffffffff86769504 [ 374.766156][ C1] RDX: 0000000000000000 RSI: ffffffff867693fe RDI: 0000000000000001 [ 374.774159][ C1] RBP: ffffc90001fa6ed8 R08: ffff888098ec4380 R09: ffffed1012ad3563 [ 374.782167][ C1] R10: ffffed1012ad3562 R11: ffff88809569ab17 R12: ffff88809569ab20 [ 374.790202][ C1] R13: ffff8880a2b51400 R14: ffff88809569ab10 R15: dffffc0000000000 [ 374.798233][ C1] ? hash_ip4_expire.isra.0+0x2f4/0x8d0 [ 374.803767][ C1] ? hash_ip4_expire.isra.0+0x1ee/0x8d0 [ 374.809313][ C1] ? hash_ip4_expire.isra.0+0x1ee/0x8d0 [ 374.814912][ C1] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 374.820378][ C1] hash_ip4_add+0x178/0x1b6c [ 374.824963][ C1] hash_ip4_uadt+0x546/0x7a0 [ 374.829556][ C1] ? hash_ip6_add+0x1d70/0x1d70 [ 374.834408][ C1] ? hash_ip6_uadt+0x670/0x670 [ 374.839195][ C1] ? __kasan_check_write+0x14/0x20 [ 374.844371][ C1] call_ad+0x1a0/0x5a0 [ 374.848432][ C1] ? start_msg+0x220/0x220 [ 374.852899][ C1] ? nla_memcpy+0xb0/0xb0 [ 374.857225][ C1] ? __nla_parse+0x43/0x60 [ 374.861681][ C1] ip_set_ad.isra.0+0x572/0xb20 [ 374.866524][ C1] ? ip_set_nfnl_get_byindex+0x460/0x460 [ 374.872152][ C1] ? nla_memcpy+0xb0/0xb0 [ 374.876465][ C1] ? lock_downgrade+0x920/0x920 [ 374.881303][ C1] ip_set_uadd+0x37/0x50 [ 374.885529][ C1] ? ip_set_udel+0x50/0x50 [ 374.889999][ C1] nfnetlink_rcv_msg+0xcf2/0xfb0 [ 374.894945][ C1] ? nfnetlink_bind+0x2c0/0x2c0 [ 374.899795][ C1] ? __kasan_check_read+0x11/0x20 [ 374.904819][ C1] ? __lock_acquire+0x8a0/0x4a00 [ 374.909760][ C1] ? save_stack+0x5c/0x90 [ 374.914093][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 374.920378][ C1] ? apparmor_capable+0x497/0x900 [ 374.925407][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 374.931664][ C1] ? __kasan_check_read+0x11/0x20 [ 374.936684][ C1] ? apparmor_cred_prepare+0x7b0/0x7b0 [ 374.942140][ C1] netlink_rcv_skb+0x177/0x450 [ 374.946898][ C1] ? nfnetlink_bind+0x2c0/0x2c0 [ 374.951741][ C1] ? netlink_ack+0xb50/0xb50 [ 374.956322][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 374.962570][ C1] ? ns_capable_common+0x93/0x100 [ 374.967597][ C1] ? ns_capable+0x20/0x30 [ 374.972030][ C1] ? __netlink_ns_capable+0x104/0x140 [ 374.977400][ C1] nfnetlink_rcv+0x1ba/0x460 [ 374.981994][ C1] ? nfnetlink_rcv_batch+0x17a0/0x17a0 [ 374.987445][ C1] ? netlink_deliver_tap+0x24a/0xbe0 [ 374.992718][ C1] ? __kasan_check_write+0x14/0x20 [ 374.997839][ C1] netlink_unicast+0x58c/0x7d0 [ 375.002603][ C1] ? netlink_attachskb+0x870/0x870 [ 375.007701][ C1] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 375.013507][ C1] ? __check_object_size+0x3d/0x437 [ 375.018707][ C1] netlink_sendmsg+0x91c/0xea0 [ 375.023461][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 375.028457][ C1] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 375.033997][ C1] ? apparmor_socket_sendmsg+0x2a/0x30 [ 375.039538][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 375.045824][ C1] ? security_socket_sendmsg+0x8d/0xc0 [ 375.051414][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 375.056395][ C1] sock_sendmsg+0xd7/0x130 [ 375.060854][ C1] ____sys_sendmsg+0x753/0x880 [ 375.065616][ C1] ? kernel_sendmsg+0x50/0x50 [ 375.070287][ C1] ? lockdep_init_map+0x1be/0x6d0 [ 375.075398][ C1] ___sys_sendmsg+0x100/0x170 [ 375.080067][ C1] ? sendmsg_copy_msghdr+0x70/0x70 [ 375.085176][ C1] ? __kasan_check_read+0x11/0x20 [ 375.090199][ C1] ? __lock_acquire+0x8a0/0x4a00 [ 375.095128][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 375.101437][ C1] ? __this_cpu_preempt_check+0x35/0x190 [ 375.107063][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 375.113299][ C1] ? percpu_counter_add_batch+0x13c/0x190 [ 375.119068][ C1] ? __fd_install+0x1bc/0x640 [ 375.123732][ C1] ? find_held_lock+0x35/0x130 [ 375.128604][ C1] ? __fd_install+0x1bc/0x640 [ 375.133271][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 375.139528][ C1] ? __fget_light+0x1a9/0x230 [ 375.144199][ C1] ? __fdget+0x1b/0x20 [ 375.148256][ C1] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 375.154496][ C1] __sys_sendmsg+0x105/0x1d0 [ 375.159229][ C1] ? __sys_sendmsg_sock+0xc0/0xc0 [ 375.164252][ C1] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 375.169699][ C1] ? do_syscall_64+0x26/0x790 [ 375.174407][ C1] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 375.180469][ C1] ? do_syscall_64+0x26/0x790 [ 375.185140][ C1] __x64_sys_sendmsg+0x78/0xb0 [ 375.189886][ C1] do_syscall_64+0xfa/0x790 [ 375.194385][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 375.200285][ C1] RIP: 0033:0x441579 [ 375.204184][ C1] Code: e8 fc ab 02 00 48 83 c4 18 c3 0f 1f 80 00 00 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 0f 83 9b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 375.223887][ C1] RSP: 002b:00007ffd0d0d25d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 375.232303][ C1] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441579 [ 375.240268][ C1] RDX: 0000000000000000 RSI: 0000000020000d00 RDI: 0000000000000004 [ 375.248275][ C1] RBP: 00000000000418c0 R08: 00000000004002c8 R09: 00000000004002c8 [ 375.256241][ C1] R10: 00000000004002c8 R11: 0000000000000246 R12: 00000000004023a0 [ 375.264203][ C1] R13: 0000000000402430 R14: 0000000000000000 R15: 0000000000000000