[ 87.882989][ T27] audit: type=1800 audit(1580015044.784:26): pid=9590 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. [ 88.966725][ T27] kauditd_printk_skb: 2 callbacks suppressed [ 88.966736][ T27] audit: type=1800 audit(1580015045.894:29): pid=9590 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 [ 88.993224][ T27] audit: type=1800 audit(1580015045.894:30): pid=9590 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 '10.128.10.42' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 361.975370][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 361.982209][ C1] rcu: 1-....: (1 GPs behind) idle=6e2/1/0x4000000000000002 softirq=15900/15902 fqs=5249 [ 361.993136][ C1] (t=10502 jiffies g=9541 q=1173) [ 361.998376][ C1] NMI backtrace for cpu 1 [ 362.002690][ C1] CPU: 1 PID: 9745 Comm: syz-executor720 Not tainted 5.5.0-rc7-syzkaller #0 [ 362.011531][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 362.021749][ C1] Call Trace: [ 362.025086][ C1] [ 362.028042][ C1] dump_stack+0x197/0x210 [ 362.032479][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 362.037811][ C1] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 362.043605][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 362.049592][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 362.055681][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 362.060892][ C1] ? find_next_bit+0x107/0x130 [ 362.065665][ C1] rcu_sched_clock_irq.cold+0x509/0xc0d [ 362.071257][ C1] ? raise_softirq+0x138/0x340 [ 362.076167][ C1] update_process_times+0x2d/0x70 [ 362.081386][ C1] tick_sched_handle+0xa2/0x190 [ 362.086223][ C1] tick_sched_timer+0x53/0x140 [ 362.099100][ C1] __hrtimer_run_queues+0x364/0xe40 [ 362.104296][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 362.109573][ C1] ? hrtimer_init+0x330/0x330 [ 362.114321][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 362.120057][ C1] ? ktime_get_update_offsets_now+0x2ce/0x430 [ 362.126124][ C1] hrtimer_interrupt+0x314/0x770 [ 362.131214][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 362.136756][ C1] apic_timer_interrupt+0xf/0x20 [ 362.141678][ C1] [ 362.144624][ C1] RIP: 0010:write_comp_data+0x17/0x70 [ 362.149995][ C1] Code: c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 5d c3 0f 1f 00 65 4c 8b 04 25 c0 1e 02 00 65 8b 05 c8 26 8d 7e a9 00 01 1f 00 75 51 <41> 8b 80 80 13 00 00 83 f8 03 75 45 49 8b 80 88 13 00 00 45 8b 80 [ 362.169805][ C1] RSP: 0018:ffffc90001fc6fa8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 362.178706][ C1] RAX: 0000000000000201 RBX: 00000000b7b0167f RCX: ffffffff8675e359 [ 362.186826][ C1] RDX: 00000000ffffeff9 RSI: 00000000ffffeff9 RDI: 0000000000000005 [ 362.194893][ C1] RBP: ffffc90001fc6fb0 R08: ffff88809e478540 R09: ffffc90001fc6f28 [ 362.202864][ C1] R10: fffff520003f8de7 R11: ffffc90001fc6f3f R12: ffffc90001fc7050 [ 362.210827][ C1] R13: 00000000ffffffff R14: 00000000ffffeff9 R15: ffffc90001fc7030 [ 362.218979][ C1] ? hash_ip4_uadt+0x569/0x7a0 [ 362.223740][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 362.229989][ C1] hash_ip4_uadt+0x569/0x7a0 [ 362.234587][ C1] ? hash_ip6_del+0xe70/0xe70 [ 362.239316][ C1] ? hash_ip6_uadt+0x670/0x670 [ 362.244136][ C1] ? __kasan_check_write+0x14/0x20 [ 362.249298][ C1] call_ad+0x1a0/0x5a0 [ 362.253371][ C1] ? start_msg+0x220/0x220 [ 362.257859][ C1] ? nla_memcpy+0xb0/0xb0 [ 362.262216][ C1] ? __nla_parse+0x43/0x60 [ 362.266634][ C1] ip_set_ad.isra.0+0x572/0xb20 [ 362.271472][ C1] ? ip_set_nfnl_get_byindex+0x460/0x460 [ 362.277112][ C1] ? nla_memcpy+0xb0/0xb0 [ 362.281489][ C1] ? lock_downgrade+0x920/0x920 [ 362.286329][ C1] ip_set_udel+0x3a/0x50 [ 362.290576][ C1] ? ip_set_ad.isra.0+0xb20/0xb20 [ 362.295647][ C1] nfnetlink_rcv_msg+0xcf2/0xfb0 [ 362.300645][ C1] ? nfnetlink_bind+0x2c0/0x2c0 [ 362.305557][ C1] ? __kasan_check_read+0x11/0x20 [ 362.310728][ C1] ? __lock_acquire+0x8a0/0x4a00 [ 362.315662][ C1] ? save_stack+0x5c/0x90 [ 362.319997][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 362.326459][ C1] ? apparmor_capable+0x497/0x900 [ 362.331630][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 362.337887][ C1] ? __kasan_check_read+0x11/0x20 [ 362.342911][ C1] ? apparmor_cred_prepare+0x7b0/0x7b0 [ 362.348479][ C1] netlink_rcv_skb+0x177/0x450 [ 362.353292][ C1] ? nfnetlink_bind+0x2c0/0x2c0 [ 362.358160][ C1] ? netlink_ack+0xb50/0xb50 [ 362.362915][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 362.369144][ C1] ? ns_capable_common+0x93/0x100 [ 362.374208][ C1] ? ns_capable+0x20/0x30 [ 362.378536][ C1] ? __netlink_ns_capable+0x104/0x140 [ 362.383898][ C1] nfnetlink_rcv+0x1ba/0x460 [ 362.388629][ C1] ? nfnetlink_rcv_batch+0x17b0/0x17b0 [ 362.394090][ C1] ? netlink_deliver_tap+0x24a/0xbe0 [ 362.399364][ C1] ? __kasan_check_write+0x14/0x20 [ 362.404478][ C1] netlink_unicast+0x58c/0x7d0 [ 362.409232][ C1] ? netlink_attachskb+0x870/0x870 [ 362.414388][ C1] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 362.420292][ C1] ? __check_object_size+0x3d/0x437 [ 362.425496][ C1] netlink_sendmsg+0x91c/0xea0 [ 362.430370][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 362.435367][ C1] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 362.441256][ C1] ? apparmor_socket_sendmsg+0x2a/0x30 [ 362.446719][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 362.453032][ C1] ? security_socket_sendmsg+0x8d/0xc0 [ 362.458599][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 362.463727][ C1] sock_sendmsg+0xd7/0x130 [ 362.468154][ C1] ____sys_sendmsg+0x753/0x880 [ 362.472908][ C1] ? kernel_sendmsg+0x50/0x50 [ 362.477582][ C1] ? lockdep_init_map+0x1be/0x6d0 [ 362.482613][ C1] ___sys_sendmsg+0x100/0x170 [ 362.487288][ C1] ? sendmsg_copy_msghdr+0x70/0x70 [ 362.492391][ C1] ? __kasan_check_read+0x11/0x20 [ 362.497406][ C1] ? __lock_acquire+0x8a0/0x4a00 [ 362.502329][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 362.508836][ C1] ? __this_cpu_preempt_check+0x35/0x190 [ 362.514474][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 362.520702][ C1] ? percpu_counter_add_batch+0x13c/0x190 [ 362.526446][ C1] ? __fd_install+0x1bc/0x640 [ 362.531235][ C1] ? find_held_lock+0x35/0x130 [ 362.536185][ C1] ? __fd_install+0x1bc/0x640 [ 362.540987][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 362.547226][ C1] ? __fget_light+0x1a9/0x230 [ 362.551895][ C1] ? __fdget+0x1b/0x20 [ 362.555970][ C1] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 362.562274][ C1] __sys_sendmsg+0x105/0x1d0 [ 362.566858][ C1] ? __sys_sendmsg_sock+0xc0/0xc0 [ 362.571910][ C1] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 362.577366][ C1] ? do_syscall_64+0x26/0x790 [ 362.582043][ C1] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 362.588180][ C1] ? do_syscall_64+0x26/0x790 [ 362.592865][ C1] __x64_sys_sendmsg+0x78/0xb0 [ 362.597638][ C1] do_syscall_64+0xfa/0x790 [ 362.602195][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 362.608142][ C1] RIP: 0033:0x440509 [ 362.612032][ 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 [ 362.631727][ C1] RSP: 002b:00007fff5f00fc28 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 362.640133][ C1] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440509 [ 362.649492][ C1] RDX: 0000000000000040 RSI: 0000000020000080 RDI: 0000000000000004 [ 362.657466][ C1] RBP: 00000000006ca018 R08: 0000000000000018 R09: 00000000004002c8 [ 362.665671][ C1] R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000401d90 [ 362.673642][ C1] R13: 0000000000401e20 R14: 0000000000000000 R15: 0000000000000000