[ 61.373657][ T26] audit: type=1800 audit(1572912937.413:27): pid=7707 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [ 61.402751][ T26] audit: type=1800 audit(1572912937.413:28): pid=7707 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2450 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. [ 62.168092][ T26] audit: type=1800 audit(1572912938.273:29): pid=7707 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2465 res=0 [ 62.188163][ T26] audit: type=1800 audit(1572912938.273:30): pid=7707 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2456 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.33' (ECDSA) to the list of known hosts. 2019/11/05 00:15:47 fuzzer started 2019/11/05 00:15:49 dialing manager at 10.128.0.105:37793 2019/11/05 00:15:50 syscalls: 2553 2019/11/05 00:15:50 code coverage: enabled 2019/11/05 00:15:50 comparison tracing: enabled 2019/11/05 00:15:50 extra coverage: extra coverage is not supported by the kernel 2019/11/05 00:15:50 setuid sandbox: enabled 2019/11/05 00:15:50 namespace sandbox: enabled 2019/11/05 00:15:50 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/05 00:15:50 fault injection: enabled 2019/11/05 00:15:50 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/05 00:15:50 net packet injection: enabled 2019/11/05 00:15:50 net device setup: enabled 2019/11/05 00:15:50 concurrency sanitizer: enabled 2019/11/05 00:15:50 devlink PCI setup: PCI device 0000:00:10.0 is not available syzkaller login: [ 75.122411][ T7875] KCSAN: could not find function: 'poll_schedule_timeout' 2019/11/05 00:15:53 adding functions to KCSAN blacklist: 'atime_needs_update' 'tick_sched_do_timer' 'find_next_bit' 'ext4_nonda_switch' 'poll_schedule_timeout' 'ext4_free_inode' 'pid_update_inode' 'do_nanosleep' 'rcu_gp_fqs_check_wake' 'tick_do_update_jiffies64' 'ktime_get_real_seconds' 'generic_write_end' '__ext4_new_inode' 'ep_poll' 'tomoyo_supervisor' '__hrtimer_run_queues' 'tcp_add_backlog' 'run_timer_softirq' 'generic_permission' 'blk_mq_sched_dispatch_requests' 'ext4_free_inodes_count' [ 82.069534][ T7862] ================================================================== [ 82.077701][ T7862] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 82.084710][ T7862] [ 82.087036][ T7862] write to 0xffff88812be1b6e4 of 1 bytes by task 0 on cpu 0: [ 82.094503][ T7862] timer_clear_idle+0x42/0x50 [ 82.099181][ T7862] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 82.105068][ T7862] tick_nohz_idle_exit+0x1af/0x1e0 [ 82.110174][ T7862] do_idle+0xb1/0x280 [ 82.114151][ T7862] cpu_startup_entry+0x1b/0x20 [ 82.118916][ T7862] rest_init+0xec/0xf6 [ 82.122991][ T7862] arch_call_rest_init+0x17/0x37 [ 82.127937][ T7862] start_kernel+0x838/0x85e [ 82.132448][ T7862] x86_64_start_reservations+0x29/0x2b [ 82.137930][ T7862] x86_64_start_kernel+0x72/0x76 [ 82.142895][ T7862] secondary_startup_64+0xa4/0xb0 [ 82.147927][ T7862] [ 82.150259][ T7862] read to 0xffff88812be1b6e4 of 1 bytes by task 7862 on cpu 1: [ 82.158934][ T7862] mod_timer+0x50d/0x7a0 [ 82.163170][ T7862] sk_reset_timer+0x2d/0x70 [ 82.167762][ T7862] tcp_rearm_rto+0x1e7/0x2a0 [ 82.172363][ T7862] tcp_event_new_data_sent+0x218/0x220 [ 82.177965][ T7862] tcp_write_xmit+0xa77/0x3120 [ 82.182733][ T7862] __tcp_push_pending_frames+0x7b/0x1d0 [ 82.188298][ T7862] tcp_push+0x1e9/0x3d0 [ 82.192457][ T7862] tcp_sendmsg_locked+0x1d2b/0x1fb0 [ 82.197919][ T7862] tcp_sendmsg+0x39/0x60 [ 82.202167][ T7862] inet_sendmsg+0x6d/0x90 [ 82.206495][ T7862] sock_sendmsg+0x9f/0xc0 [ 82.210818][ T7862] sock_write_iter+0x16b/0x210 [ 82.217245][ T7862] new_sync_write+0x388/0x4a0 [ 82.221917][ T7862] __vfs_write+0xb1/0xc0 [ 82.226154][ T7862] vfs_write+0x18a/0x390 [ 82.230391][ T7862] ksys_write+0xd5/0x1b0 [ 82.234629][ T7862] __x64_sys_write+0x4c/0x60 [ 82.239218][ T7862] do_syscall_64+0xcc/0x370 [ 82.243732][ T7862] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 82.249604][ T7862] [ 82.251922][ T7862] Reported by Kernel Concurrency Sanitizer on: [ 82.258070][ T7862] CPU: 1 PID: 7862 Comm: syz-fuzzer Not tainted 5.4.0-rc6+ #0 [ 82.265519][ T7862] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 82.277309][ T7862] ================================================================== [ 82.286088][ T7862] Kernel panic - not syncing: panic_on_warn set ... [ 82.292668][ T7862] CPU: 1 PID: 7862 Comm: syz-fuzzer Not tainted 5.4.0-rc6+ #0 [ 82.300109][ T7862] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 82.310151][ T7862] Call Trace: [ 82.313445][ T7862] dump_stack+0xf5/0x159 [ 82.317682][ T7862] panic+0x210/0x640 [ 82.321591][ T7862] ? vprintk_func+0x8d/0x140 [ 82.326181][ T7862] kcsan_report.cold+0xc/0xe [ 82.330771][ T7862] kcsan_setup_watchpoint+0x3fe/0x410 [ 82.336152][ T7862] __tsan_read1+0x13f/0x1e0 [ 82.340656][ T7862] mod_timer+0x50d/0x7a0 [ 82.344926][ T7862] ? tcp_update_skb_after_send+0x1a6/0x260 [ 82.350752][ T7862] sk_reset_timer+0x2d/0x70 [ 82.355264][ T7862] tcp_rearm_rto+0x1e7/0x2a0 [ 82.359876][ T7862] tcp_event_new_data_sent+0x218/0x220 [ 82.365911][ T7862] tcp_write_xmit+0xa77/0x3120 [ 82.370682][ T7862] ? kmem_cache_alloc_node_trace+0x273/0x670 [ 82.376678][ T7862] __tcp_push_pending_frames+0x7b/0x1d0 [ 82.382228][ T7862] tcp_push+0x1e9/0x3d0 [ 82.386407][ T7862] tcp_sendmsg_locked+0x1d2b/0x1fb0 [ 82.391617][ T7862] tcp_sendmsg+0x39/0x60 [ 82.395857][ T7862] inet_sendmsg+0x6d/0x90 [ 82.400183][ T7862] ? inet_send_prepare+0x200/0x200 [ 82.405293][ T7862] sock_sendmsg+0x9f/0xc0 [ 82.409626][ T7862] sock_write_iter+0x16b/0x210 [ 82.414395][ T7862] new_sync_write+0x388/0x4a0 [ 82.419089][ T7862] __vfs_write+0xb1/0xc0 [ 82.423337][ T7862] vfs_write+0x18a/0x390 [ 82.427599][ T7862] ksys_write+0xd5/0x1b0 [ 82.431841][ T7862] __x64_sys_write+0x4c/0x60 [ 82.436444][ T7862] do_syscall_64+0xcc/0x370 [ 82.440954][ T7862] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 82.446835][ T7862] RIP: 0033:0x47c530 [ 82.450744][ T7862] Code: 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 49 c7 c2 00 00 00 00 49 c7 c0 00 00 00 00 49 c7 c1 00 00 00 00 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 [ 82.470340][ T7862] RSP: 002b:000000c420a2b4f8 EFLAGS: 00000216 ORIG_RAX: 0000000000000001 [ 82.478744][ T7862] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 82.486724][ T7862] RDX: 0000000000000007 RSI: 000000c42036e200 RDI: 0000000000000003 [ 82.494686][ T7862] RBP: 000000c420a2b550 R08: 0000000000000000 R09: 0000000000000000 [ 82.503256][ T7862] R10: 0000000000000000 R11: 0000000000000216 R12: 000000c4200b5b00 [ 82.511217][ T7862] R13: 0000000000000007 R14: 0000000000c1dc00 R15: 00000000000003a0 [ 83.659627][ T7862] Shutting down cpus with NMI [ 83.665700][ T7862] Kernel Offset: disabled [ 83.670029][ T7862] Rebooting in 86400 seconds..