[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.141598][ T26] audit: type=1800 audit(1570868860.780:25): pid=7223 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.185937][ T26] audit: type=1800 audit(1570868860.780:26): pid=7223 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.211349][ T26] audit: type=1800 audit(1570868860.780:27): pid=7223 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 '10.128.10.11' (ECDSA) to the list of known hosts. 2019/10/12 08:27:52 fuzzer started 2019/10/12 08:27:53 dialing manager at 10.128.0.105:43913 2019/10/12 08:27:53 syscalls: 2523 2019/10/12 08:27:53 code coverage: enabled 2019/10/12 08:27:53 comparison tracing: enabled 2019/10/12 08:27:53 extra coverage: extra coverage is not supported by the kernel 2019/10/12 08:27:53 setuid sandbox: enabled 2019/10/12 08:27:53 namespace sandbox: enabled 2019/10/12 08:27:53 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/12 08:27:53 fault injection: enabled 2019/10/12 08:27:53 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/12 08:27:53 net packet injection: enabled 2019/10/12 08:27:53 net device setup: enabled 2019/10/12 08:27:53 concurrency sanitizer: enabled syzkaller login: [ 50.273160][ T7388] ================================================================== [ 50.281776][ T7388] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 50.288796][ T7388] [ 50.291214][ T7388] write to 0xffff88812bf1b6e4 of 1 bytes by task 0 on cpu 1: [ 50.298672][ T7388] timer_clear_idle+0x42/0x50 [ 50.303629][ T7388] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 50.309701][ T7388] tick_nohz_idle_exit+0x1af/0x1e0 [ 50.315042][ T7388] do_idle+0xb0/0x2c0 [ 50.319113][ T7388] cpu_startup_entry+0x1b/0x20 [ 50.324163][ T7388] start_secondary+0x207/0x260 [ 50.329307][ T7388] secondary_startup_64+0xa4/0xb0 [ 50.334410][ T7388] [ 50.336740][ T7388] read to 0xffff88812bf1b6e4 of 1 bytes by task 7388 on cpu 0: [ 50.344284][ T7388] mod_timer+0x50d/0x7a0 [ 50.348527][ T7388] sk_reset_timer+0x2d/0x70 [ 50.353131][ T7388] tcp_rearm_rto.part.0+0x190/0x240 [ 50.358333][ T7388] tcp_rearm_rto+0x4f/0x60 [ 50.362901][ T7388] tcp_event_new_data_sent+0x1bb/0x1c0 [ 50.368665][ T7388] tcp_write_xmit+0xa16/0x3080 [ 50.374233][ T7388] __tcp_push_pending_frames+0x7b/0x1d0 [ 50.379852][ T7388] tcp_push+0x1e9/0x3d0 [ 50.384009][ T7388] tcp_sendmsg_locked+0x1d1b/0x1ef0 [ 50.389196][ T7388] tcp_sendmsg+0x39/0x60 [ 50.393442][ T7388] inet_sendmsg+0x6d/0x90 [ 50.398031][ T7388] sock_sendmsg+0x9f/0xc0 [ 50.402485][ T7388] sock_write_iter+0x16b/0x210 [ 50.407232][ T7388] [ 50.409552][ T7388] Reported by Kernel Concurrency Sanitizer on: [ 50.415833][ T7388] CPU: 0 PID: 7388 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 50.422950][ T7388] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.433228][ T7388] ================================================================== [ 50.441398][ T7388] Kernel panic - not syncing: panic_on_warn set ... [ 50.448168][ T7388] CPU: 0 PID: 7388 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 50.455485][ T7388] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.466151][ T7388] Call Trace: [ 50.470194][ T7388] dump_stack+0xf5/0x159 [ 50.474562][ T7388] panic+0x209/0x639 [ 50.478457][ T7388] ? tcp_sendmsg_locked+0x1d1b/0x1ef0 [ 50.484011][ T7388] ? vprintk_func+0x8d/0x140 [ 50.488722][ T7388] kcsan_report.cold+0xc/0x1b [ 50.493589][ T7388] __kcsan_setup_watchpoint+0x3ee/0x510 [ 50.499268][ T7388] __tsan_read1+0x2c/0x30 [ 50.503605][ T7388] mod_timer+0x50d/0x7a0 [ 50.507947][ T7388] ? __kcsan_setup_watchpoint+0x96/0x510 [ 50.513580][ T7388] ? __kcsan_setup_watchpoint+0x96/0x510 [ 50.519400][ T7388] sk_reset_timer+0x2d/0x70 [ 50.523905][ T7388] tcp_rearm_rto.part.0+0x190/0x240 [ 50.529206][ T7388] tcp_rearm_rto+0x4f/0x60 [ 50.533709][ T7388] tcp_event_new_data_sent+0x1bb/0x1c0 [ 50.539190][ T7388] tcp_write_xmit+0xa16/0x3080 [ 50.544314][ T7388] ? kmem_cache_alloc_node_trace+0x273/0x670 [ 50.550669][ T7388] __tcp_push_pending_frames+0x7b/0x1d0 [ 50.556358][ T7388] tcp_push+0x1e9/0x3d0 [ 50.560964][ T7388] tcp_sendmsg_locked+0x1d1b/0x1ef0 [ 50.566261][ T7388] tcp_sendmsg+0x39/0x60 [ 50.570590][ T7388] inet_sendmsg+0x6d/0x90 [ 50.575251][ T7388] ? inet_send_prepare+0x200/0x200 [ 50.580396][ T7388] sock_sendmsg+0x9f/0xc0 [ 50.584724][ T7388] sock_write_iter+0x16b/0x210 [ 50.590598][ T7388] new_sync_write+0x388/0x4a0 [ 50.595393][ T7388] __vfs_write+0xb1/0xc0 [ 50.599784][ T7388] vfs_write+0x18a/0x390 [ 50.604042][ T7388] ksys_write+0xd5/0x1b0 [ 50.608332][ T7388] __x64_sys_write+0x4c/0x60 [ 50.613182][ T7388] do_syscall_64+0xcf/0x2f0 [ 50.617726][ T7388] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 50.624564][ T7388] RIP: 0033:0x47c530 [ 50.628556][ T7388] 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 [ 50.648625][ T7388] RSP: 002b:000000c420b834f8 EFLAGS: 00000216 ORIG_RAX: 0000000000000001 [ 50.657035][ T7388] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 50.665182][ T7388] RDX: 0000000000000008 RSI: 000000c4202f6020 RDI: 0000000000000003 [ 50.673591][ T7388] RBP: 000000c420b83550 R08: 0000000000000000 R09: 0000000000000000 [ 50.681824][ T7388] R10: 0000000000000000 R11: 0000000000000216 R12: 000000c4200c3b00 [ 50.690155][ T7388] R13: 0000000000000007 R14: 0000000000c12600 R15: 0000000000001eaa [ 51.836817][ T7388] Shutting down cpus with NMI [ 51.844758][ T7388] Kernel Offset: disabled [ 51.850393][ T7388] Rebooting in 86400 seconds..