[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.377375][ T25] audit: type=1800 audit(1570602047.377:25): pid=7170 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.397333][ T25] audit: type=1800 audit(1570602047.377:26): pid=7170 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.418910][ T25] audit: type=1800 audit(1570602047.377:27): pid=7170 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 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. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.2' (ECDSA) to the list of known hosts. 2019/10/09 06:20:58 fuzzer started 2019/10/09 06:20:59 dialing manager at 10.128.0.105:35069 2019/10/09 06:20:59 syscalls: 2523 2019/10/09 06:20:59 code coverage: enabled 2019/10/09 06:20:59 comparison tracing: enabled 2019/10/09 06:20:59 extra coverage: extra coverage is not supported by the kernel 2019/10/09 06:20:59 setuid sandbox: enabled 2019/10/09 06:20:59 namespace sandbox: enabled 2019/10/09 06:20:59 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/09 06:20:59 fault injection: enabled 2019/10/09 06:20:59 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/09 06:20:59 net packet injection: enabled 2019/10/09 06:20:59 net device setup: enabled 2019/10/09 06:20:59 concurrency sanitizer: enabled syzkaller login: [ 50.671643][ T7328] ================================================================== [ 50.680140][ T7328] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 50.688448][ T7328] [ 50.690927][ T7328] write to 0xffff88812bf1b6e4 of 1 bytes by task 0 on cpu 1: [ 50.699015][ T7328] timer_clear_idle+0x42/0x50 [ 50.705178][ T7328] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 50.711591][ T7328] tick_nohz_idle_exit+0x1af/0x1e0 [ 50.717227][ T7328] do_idle+0xb0/0x2c0 [ 50.721780][ T7328] cpu_startup_entry+0x1b/0x20 [ 50.729767][ T7328] start_secondary+0x207/0x260 [ 50.735924][ T7328] secondary_startup_64+0xa4/0xb0 [ 50.741738][ T7328] [ 50.744145][ T7328] read to 0xffff88812bf1b6e4 of 1 bytes by task 7328 on cpu 0: [ 50.751938][ T7328] mod_timer+0x50d/0x7a0 [ 50.756342][ T7328] sk_reset_timer+0x2d/0x70 [ 50.760955][ T7328] tcp_rearm_rto.part.0+0x190/0x240 [ 50.766318][ T7328] tcp_rearm_rto+0x4f/0x60 [ 50.770813][ T7328] tcp_event_new_data_sent+0x1bb/0x1c0 [ 50.778195][ T7328] tcp_write_xmit+0xa16/0x3080 [ 50.784181][ T7328] __tcp_push_pending_frames+0x7b/0x1d0 [ 50.790625][ T7328] tcp_push+0x1e9/0x3d0 [ 50.797165][ T7328] tcp_sendmsg_locked+0x1d1b/0x1ef0 [ 50.805753][ T7328] tcp_sendmsg+0x39/0x60 [ 50.811772][ T7328] inet_sendmsg+0x6d/0x90 [ 50.818128][ T7328] sock_sendmsg+0x9f/0xc0 [ 50.823889][ T7328] sock_write_iter+0x16b/0x210 [ 50.830312][ T7328] [ 50.832835][ T7328] Reported by Kernel Concurrency Sanitizer on: [ 50.839263][ T7328] CPU: 0 PID: 7328 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 50.847075][ T7328] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.858537][ T7328] ================================================================== [ 50.867148][ T7328] Kernel panic - not syncing: panic_on_warn set ... [ 50.874176][ T7328] CPU: 0 PID: 7328 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 50.881281][ T7328] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.893951][ T7328] Call Trace: [ 50.898817][ T7328] dump_stack+0xf5/0x159 [ 50.906110][ T7328] panic+0x209/0x639 [ 50.911465][ T7328] ? tcp_sendmsg_locked+0x1d1b/0x1ef0 [ 50.917609][ T7328] ? vprintk_func+0x8d/0x140 [ 50.923152][ T7328] kcsan_report.cold+0xc/0x1b [ 50.928270][ T7328] __kcsan_setup_watchpoint+0x3ee/0x510 [ 50.933805][ T7328] __tsan_read1+0x2c/0x30 [ 50.938131][ T7328] mod_timer+0x50d/0x7a0 [ 50.943764][ T7328] ? __kcsan_setup_watchpoint+0x96/0x510 [ 50.949384][ T7328] ? __kcsan_setup_watchpoint+0x96/0x510 [ 50.955396][ T7328] sk_reset_timer+0x2d/0x70 [ 50.960242][ T7328] tcp_rearm_rto.part.0+0x190/0x240 [ 50.965681][ T7328] tcp_rearm_rto+0x4f/0x60 [ 50.970569][ T7328] tcp_event_new_data_sent+0x1bb/0x1c0 [ 50.976995][ T7328] tcp_write_xmit+0xa16/0x3080 [ 50.984468][ T7328] ? kmem_cache_alloc_node_trace+0x273/0x670 [ 50.990910][ T7328] __tcp_push_pending_frames+0x7b/0x1d0 [ 51.006475][ T7328] tcp_push+0x1e9/0x3d0 [ 51.012663][ T7328] tcp_sendmsg_locked+0x1d1b/0x1ef0 [ 51.019817][ T7328] tcp_sendmsg+0x39/0x60 [ 51.027191][ T7328] inet_sendmsg+0x6d/0x90 [ 51.032126][ T7328] ? inet_send_prepare+0x200/0x200 [ 51.037247][ T7328] sock_sendmsg+0x9f/0xc0 [ 51.042111][ T7328] sock_write_iter+0x16b/0x210 [ 51.048052][ T7328] new_sync_write+0x388/0x4a0 [ 51.053450][ T7328] __vfs_write+0xb1/0xc0 [ 51.057729][ T7328] vfs_write+0x18a/0x390 [ 51.062057][ T7328] ksys_write+0xd5/0x1b0 [ 51.066478][ T7328] __x64_sys_write+0x4c/0x60 [ 51.071684][ T7328] do_syscall_64+0xcf/0x2f0 [ 51.076183][ T7328] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 51.082181][ T7328] RIP: 0033:0x47c530 [ 51.086826][ T7328] 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 [ 51.112447][ T7328] RSP: 002b:000000c4201e54f8 EFLAGS: 00000216 ORIG_RAX: 0000000000000001 [ 51.123699][ T7328] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 51.132355][ T7328] RDX: 0000000000000008 RSI: 000000c4201585c0 RDI: 0000000000000003 [ 51.140308][ T7328] RBP: 000000c4201e5550 R08: 0000000000000000 R09: 0000000000000000 [ 51.148353][ T7328] R10: 0000000000000000 R11: 0000000000000216 R12: 000000c4200b3b00 [ 51.156318][ T7328] R13: 0000000000000007 R14: 0000000000c11600 R15: 0000000000001e47 [ 52.304066][ T7328] Shutting down cpus with NMI [ 52.310560][ T7328] Kernel Offset: disabled [ 52.314968][ T7328] Rebooting in 86400 seconds..