[ 79.692061][ T27] audit: type=1800 audit(1579916797.720:26): pid=9664 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. [ 80.774104][ T27] kauditd_printk_skb: 2 callbacks suppressed [ 80.774117][ T27] audit: type=1800 audit(1579916798.820:29): pid=9664 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 [ 80.801759][ T27] audit: type=1800 audit(1579916798.820:30): pid=9664 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 '10.128.0.165' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 373.819021][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 373.825881][ C0] rcu: 0-....: (1 GPs behind) idle=a22/1/0x4000000000000002 softirq=15428/15430 fqs=5198 [ 373.836010][ C0] (t=10500 jiffies g=9105 q=872) [ 373.841027][ C0] NMI backtrace for cpu 0 [ 373.845339][ C0] CPU: 0 PID: 9817 Comm: syz-executor030 Not tainted 5.5.0-rc6-syzkaller #0 [ 373.854081][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 373.864229][ C0] Call Trace: [ 373.867497][ C0] [ 373.870444][ C0] dump_stack+0x197/0x210 [ 373.874766][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 373.880039][ C0] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 373.885682][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 373.891662][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 373.897795][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 373.904079][ C0] ? find_next_bit+0x107/0x130 [ 373.908839][ C0] rcu_sched_clock_irq.cold+0x509/0xc0d [ 373.914444][ C0] ? raise_softirq+0x138/0x340 [ 373.919237][ C0] update_process_times+0x2d/0x70 [ 373.924272][ C0] tick_sched_handle+0xa2/0x190 [ 373.929230][ C0] tick_sched_timer+0x53/0x140 [ 373.933999][ C0] __hrtimer_run_queues+0x364/0xe40 [ 373.939196][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 373.944519][ C0] ? hrtimer_init+0x330/0x330 [ 373.949255][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 373.954977][ C0] ? ktime_get_update_offsets_now+0x2ce/0x430 [ 373.961143][ C0] hrtimer_interrupt+0x314/0x770 [ 373.966165][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 373.972407][ C0] apic_timer_interrupt+0xf/0x20 [ 373.977341][ C0] [ 373.980280][ C0] RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 373.987135][ C0] Code: 48 89 e5 48 8b 4d 08 e8 d8 fe ff ff 5d c3 66 0f 1f 44 00 00 55 89 f2 89 fe bf 05 00 00 00 48 89 e5 48 8b 4d 08 e8 ba fe ff ff <5d> c3 0f 1f 84 00 00 00 00 00 55 48 89 f2 48 89 fe bf 07 00 00 00 [ 374.007428][ C0] RSP: 0018:ffffc90005756fb0 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 [ 374.016122][ C0] RAX: 0000000000000000 RBX: 00000000b728b41b RCX: ffffffff867b35f6 [ 374.024199][ C0] RDX: 000000001bb428b7 RSI: 0000000000000000 RDI: 0000000000000005 [ 374.032173][ C0] RBP: ffffc90005756fb0 R08: ffff8880a52a4640 R09: ffffc90005756f28 [ 374.040398][ C0] R10: fffff52000aeade7 R11: ffffc90005756f3f R12: ffffc90005757050 [ 374.048598][ C0] R13: 00000000bfffffff R14: 000000001bb428b7 R15: ffffc90005757030 [ 374.056721][ C0] ? hash_ip4_uadt+0x506/0x7a0 [ 374.061616][ C0] hash_ip4_uadt+0x506/0x7a0 [ 374.066197][ C0] ? hash_ip6_del+0xe70/0xe70 [ 374.070879][ C0] ? hash_ip6_uadt+0x670/0x670 [ 374.075696][ C0] ? __kasan_check_write+0x14/0x20 [ 374.080816][ C0] call_ad+0x1a0/0x5a0 [ 374.084989][ C0] ? start_msg+0x220/0x220 [ 374.089780][ C0] ? nla_memcpy+0xb0/0xb0 [ 374.094114][ C0] ? __nla_parse+0x43/0x60 [ 374.098533][ C0] ip_set_ad.isra.0+0x572/0xb20 [ 374.103391][ C0] ? ip_set_nfnl_get_byindex+0x460/0x460 [ 374.109043][ C0] ? nla_memcpy+0xb0/0xb0 [ 374.113459][ C0] ? lock_downgrade+0x920/0x920 [ 374.118318][ C0] ip_set_udel+0x3a/0x50 [ 374.122687][ C0] ? ip_set_ad.isra.0+0xb20/0xb20 [ 374.127822][ C0] nfnetlink_rcv_msg+0xcf2/0xfb0 [ 374.132786][ C0] ? nfnetlink_bind+0x2c0/0x2c0 [ 374.137645][ C0] ? __kasan_check_read+0x11/0x20 [ 374.142692][ C0] ? __lock_acquire+0x8a0/0x4a00 [ 374.147781][ C0] ? save_stack+0x5c/0x90 [ 374.152242][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 374.158544][ C0] ? apparmor_capable+0x497/0x900 [ 374.163570][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 374.170499][ C0] ? __kasan_check_read+0x11/0x20 [ 374.175519][ C0] ? apparmor_cred_prepare+0x7b0/0x7b0 [ 374.180983][ C0] netlink_rcv_skb+0x177/0x450 [ 374.185769][ C0] ? nfnetlink_bind+0x2c0/0x2c0 [ 374.190753][ C0] ? netlink_ack+0xb50/0xb50 [ 374.195348][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 374.201603][ C0] ? ns_capable_common+0x93/0x100 [ 374.206616][ C0] ? ns_capable+0x20/0x30 [ 374.211007][ C0] ? __netlink_ns_capable+0x104/0x140 [ 374.216399][ C0] nfnetlink_rcv+0x1ba/0x460 [ 374.221188][ C0] ? nfnetlink_rcv_batch+0x17a0/0x17a0 [ 374.226632][ C0] ? netlink_deliver_tap+0x24a/0xbf0 [ 374.232078][ C0] ? __kasan_check_write+0x14/0x20 [ 374.237190][ C0] netlink_unicast+0x59e/0x7e0 [ 374.242141][ C0] ? netlink_attachskb+0x870/0x870 [ 374.248287][ C0] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 374.254157][ C0] ? __check_object_size+0x3d/0x437 [ 374.259354][ C0] netlink_sendmsg+0x91c/0xea0 [ 374.264657][ C0] ? netlink_unicast+0x7e0/0x7e0 [ 374.269594][ C0] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 374.275144][ C0] ? apparmor_socket_sendmsg+0x2a/0x30 [ 374.280605][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 374.287047][ C0] ? security_socket_sendmsg+0x8d/0xc0 [ 374.292527][ C0] ? netlink_unicast+0x7e0/0x7e0 [ 374.297540][ C0] sock_sendmsg+0xd7/0x130 [ 374.301967][ C0] ____sys_sendmsg+0x753/0x880 [ 374.306843][ C0] ? kernel_sendmsg+0x50/0x50 [ 374.311786][ C0] ? lockdep_init_map+0x1be/0x6d0 [ 374.316876][ C0] ___sys_sendmsg+0x100/0x170 [ 374.321605][ C0] ? sendmsg_copy_msghdr+0x70/0x70 [ 374.326736][ C0] ? __kasan_check_read+0x11/0x20 [ 374.331760][ C0] ? __lock_acquire+0x8a0/0x4a00 [ 374.336702][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 374.343532][ C0] ? __this_cpu_preempt_check+0x35/0x190 [ 374.349200][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 374.355456][ C0] ? percpu_counter_add_batch+0x13c/0x190 [ 374.361213][ C0] ? __fd_install+0x1bc/0x640 [ 374.366004][ C0] ? find_held_lock+0x35/0x130 [ 374.371002][ C0] ? __fd_install+0x1bc/0x640 [ 374.375953][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 374.382219][ C0] ? __fget_light+0x1a9/0x230 [ 374.387399][ C0] ? __fdget+0x1b/0x20 [ 374.391743][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 374.397984][ C0] __sys_sendmsg+0x105/0x1d0 [ 374.402721][ C0] ? __sys_sendmsg_sock+0xc0/0xc0 [ 374.407858][ C0] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 374.413419][ C0] ? do_syscall_64+0x26/0x790 [ 374.418114][ C0] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 374.424181][ C0] ? do_syscall_64+0x26/0x790 [ 374.428975][ C0] __x64_sys_sendmsg+0x78/0xb0 [ 374.433759][ C0] do_syscall_64+0xfa/0x790 [ 374.438252][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 374.444289][ C0] RIP: 0033:0x440509 [ 374.448268][ C0] 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 [ 374.467877][ C0] RSP: 002b:00007fff675f5218 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 374.476376][ C0] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440509 [ 374.484443][ C0] RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000004 [ 374.492940][ C0] RBP: 00000000006ca018 R08: 0000000000000018 R09: 00000000004002c8 [ 374.500909][ C0] R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000401d90 [ 374.508878][ C0] R13: 0000000000401e20 R14: 0000000000000000 R15: 0000000000000000