[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.382906][ T25] audit: type=1800 audit(1570871957.556:25): pid=7175 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.422179][ T25] audit: type=1800 audit(1570871957.556:26): pid=7175 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.466066][ T25] audit: type=1800 audit(1570871957.556:27): pid=7175 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 '10.128.0.162' (ECDSA) to the list of known hosts. 2019/10/12 09:19:28 fuzzer started 2019/10/12 09:19:29 dialing manager at 10.128.0.105:43913 2019/10/12 09:19:29 syscalls: 2523 2019/10/12 09:19:29 code coverage: enabled 2019/10/12 09:19:29 comparison tracing: enabled 2019/10/12 09:19:29 extra coverage: extra coverage is not supported by the kernel 2019/10/12 09:19:29 setuid sandbox: enabled 2019/10/12 09:19:29 namespace sandbox: enabled 2019/10/12 09:19:29 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/12 09:19:29 fault injection: enabled 2019/10/12 09:19:29 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/12 09:19:29 net packet injection: enabled 2019/10/12 09:19:29 net device setup: enabled 2019/10/12 09:19:29 concurrency sanitizer: enabled syzkaller login: [ 49.773228][ T7338] ================================================================== [ 49.781361][ T7338] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 49.788286][ T7338] [ 49.790606][ T7338] write to 0xffff88812bf1b6e4 of 1 bytes by task 0 on cpu 1: [ 49.798057][ T7338] timer_clear_idle+0x42/0x50 [ 49.802722][ T7338] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 49.808614][ T7338] tick_nohz_idle_exit+0x1af/0x1e0 [ 49.813713][ T7338] do_idle+0xb0/0x2c0 [ 49.817683][ T7338] cpu_startup_entry+0x1b/0x20 [ 49.822439][ T7338] start_secondary+0x207/0x260 [ 49.827194][ T7338] secondary_startup_64+0xa4/0xb0 [ 49.832198][ T7338] [ 49.834515][ T7338] read to 0xffff88812bf1b6e4 of 1 bytes by task 7338 on cpu 0: [ 49.842045][ T7338] mod_timer+0x50d/0x7a0 [ 49.846285][ T7338] sk_reset_timer+0x2d/0x70 [ 49.850775][ T7338] tcp_rearm_rto.part.0+0x190/0x240 [ 49.856047][ T7338] tcp_rearm_rto+0x4f/0x60 [ 49.860452][ T7338] tcp_event_new_data_sent+0x1bb/0x1c0 [ 49.865906][ T7338] tcp_write_xmit+0xa16/0x3080 [ 49.870674][ T7338] __tcp_push_pending_frames+0x7b/0x1d0 [ 49.876205][ T7338] tcp_push+0x1e9/0x3d0 [ 49.880350][ T7338] tcp_sendmsg_locked+0x1d1b/0x1ef0 [ 49.885533][ T7338] tcp_sendmsg+0x39/0x60 [ 49.889763][ T7338] inet_sendmsg+0x6d/0x90 [ 49.894167][ T7338] sock_sendmsg+0x9f/0xc0 [ 49.898483][ T7338] sock_write_iter+0x16b/0x210 [ 49.903223][ T7338] [ 49.905535][ T7338] Reported by Kernel Concurrency Sanitizer on: [ 49.911677][ T7338] CPU: 0 PID: 7338 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 49.918781][ T7338] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.928829][ T7338] ================================================================== [ 49.936875][ T7338] Kernel panic - not syncing: panic_on_warn set ... [ 49.943454][ T7338] CPU: 0 PID: 7338 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 49.950542][ T7338] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.960579][ T7338] Call Trace: [ 49.963864][ T7338] dump_stack+0xf5/0x159 [ 49.968119][ T7338] panic+0x209/0x639 [ 49.972006][ T7338] ? tcp_sendmsg_locked+0x1d1b/0x1ef0 [ 49.977364][ T7338] ? vprintk_func+0x8d/0x140 [ 49.981957][ T7338] kcsan_report.cold+0xc/0x1b [ 49.986721][ T7338] __kcsan_setup_watchpoint+0x3ee/0x510 [ 49.992265][ T7338] __tsan_read1+0x2c/0x30 [ 49.997476][ T7338] mod_timer+0x50d/0x7a0 [ 50.002503][ T7338] ? __kcsan_setup_watchpoint+0x96/0x510 [ 50.008125][ T7338] ? __kcsan_setup_watchpoint+0x96/0x510 [ 50.013767][ T7338] sk_reset_timer+0x2d/0x70 [ 50.018293][ T7338] tcp_rearm_rto.part.0+0x190/0x240 [ 50.023493][ T7338] tcp_rearm_rto+0x4f/0x60 [ 50.027916][ T7338] tcp_event_new_data_sent+0x1bb/0x1c0 [ 50.033371][ T7338] tcp_write_xmit+0xa16/0x3080 [ 50.038146][ T7338] ? kmem_cache_alloc_node_trace+0x273/0x670 [ 50.044143][ T7338] __tcp_push_pending_frames+0x7b/0x1d0 [ 50.049689][ T7338] tcp_push+0x1e9/0x3d0 [ 50.053853][ T7338] tcp_sendmsg_locked+0x1d1b/0x1ef0 [ 50.059055][ T7338] tcp_sendmsg+0x39/0x60 [ 50.063289][ T7338] inet_sendmsg+0x6d/0x90 [ 50.067622][ T7338] ? inet_send_prepare+0x200/0x200 [ 50.072722][ T7338] sock_sendmsg+0x9f/0xc0 [ 50.077140][ T7338] sock_write_iter+0x16b/0x210 [ 50.081903][ T7338] new_sync_write+0x388/0x4a0 [ 50.086577][ T7338] __vfs_write+0xb1/0xc0 [ 50.090809][ T7338] vfs_write+0x18a/0x390 [ 50.095045][ T7338] ksys_write+0xd5/0x1b0 [ 50.099280][ T7338] __x64_sys_write+0x4c/0x60 [ 50.103860][ T7338] do_syscall_64+0xcf/0x2f0 [ 50.108391][ T7338] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 50.114276][ T7338] RIP: 0033:0x47c530 [ 50.118165][ T7338] 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 [ 50.137767][ T7338] RSP: 002b:000000c42029f4f8 EFLAGS: 00000216 ORIG_RAX: 0000000000000001 [ 50.146167][ T7338] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 50.154136][ T7338] RDX: 0000000000000007 RSI: 000000c42015c5c0 RDI: 0000000000000003 [ 50.162106][ T7338] RBP: 000000c42029f550 R08: 0000000000000000 R09: 0000000000000000 [ 50.170069][ T7338] R10: 0000000000000000 R11: 0000000000000216 R12: 000000c4200c3b00 [ 50.178027][ T7338] R13: 000000000000000f R14: 0000000000c12600 R15: 0000000000000fe1 [ 51.319228][ T7338] Shutting down cpus with NMI [ 51.325331][ T7338] Kernel Offset: disabled [ 51.329660][ T7338] Rebooting in 86400 seconds..