[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.236309][ T25] audit: type=1800 audit(1572468054.939:25): pid=6985 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.256610][ T25] audit: type=1800 audit(1572468054.939:26): pid=6985 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.278896][ T25] audit: type=1800 audit(1572468054.939:27): pid=6985 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 '10.128.0.110' (ECDSA) to the list of known hosts. 2019/10/30 20:41:06 fuzzer started 2019/10/30 20:41:07 dialing manager at 10.128.0.105:37477 2019/10/30 20:41:07 checking machine... 2019/10/30 20:41:07 checking revisions... 2019/10/30 20:41:07 testing simple program... syzkaller login: [ 47.721932][ T7151] IPVS: ftp: loaded support on port[0] = 21 2019/10/30 20:41:07 building call list... executing program [ 51.536219][ T7156] can: request_module (can-proto-0) failed. [ 51.549647][ T7156] can: request_module (can-proto-0) failed. 2019/10/30 20:41:14 syscalls: 2540 2019/10/30 20:41:14 code coverage: enabled 2019/10/30 20:41:14 comparison tracing: enabled 2019/10/30 20:41:14 extra coverage: extra coverage is not supported by the kernel 2019/10/30 20:41:14 setuid sandbox: enabled 2019/10/30 20:41:14 namespace sandbox: enabled 2019/10/30 20:41:14 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/30 20:41:14 fault injection: enabled 2019/10/30 20:41:14 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/30 20:41:14 net packet injection: enabled 2019/10/30 20:41:14 net device setup: enabled 2019/10/30 20:41:14 concurrency sanitizer: enabled [ 54.444275][ T0] ================================================================== [ 54.452649][ T0] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 54.459569][ T0] [ 54.461900][ T0] read to 0xffff88812be1b6e4 of 1 bytes by task 7137 on cpu 1: [ 54.469438][ T0] mod_timer+0x50d/0x7a0 [ 54.473669][ T0] sk_reset_timer+0x2d/0x70 [ 54.478331][ T0] tcp_rearm_rto.part.0+0x190/0x240 [ 54.483515][ T0] tcp_rearm_rto+0x4f/0x60 [ 54.487915][ T0] tcp_event_new_data_sent+0x1bb/0x1c0 [ 54.493492][ T0] tcp_write_xmit+0xa16/0x3080 [ 54.498250][ T0] __tcp_push_pending_frames+0x7b/0x1d0 [ 54.503797][ T0] tcp_push+0x1e9/0x3d0 [ 54.507950][ T0] tcp_sendmsg_locked+0x1d1e/0x1f30 [ 54.513334][ T0] tcp_sendmsg+0x39/0x60 [ 54.517576][ T0] inet_sendmsg+0x6d/0x90 [ 54.521911][ T0] sock_sendmsg+0x9f/0xc0 [ 54.526243][ T0] sock_write_iter+0x16b/0x210 [ 54.531018][ T0] new_sync_write+0x388/0x4a0 [ 54.536206][ T0] [ 54.538532][ T0] write to 0xffff88812be1b6e4 of 1 bytes by task 0 on cpu 0: [ 54.546550][ T0] timer_clear_idle+0x42/0x50 [ 54.551240][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 54.557129][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 54.562539][ T0] do_idle+0xb1/0x280 [ 54.566801][ T0] cpu_startup_entry+0x1b/0x20 [ 54.571624][ T0] rest_init+0xec/0xf6 [ 54.575850][ T0] arch_call_rest_init+0x17/0x37 [ 54.580936][ T0] start_kernel+0x838/0x85e [ 54.585433][ T0] x86_64_start_reservations+0x29/0x2b [ 54.591384][ T0] x86_64_start_kernel+0x72/0x76 [ 54.596332][ T0] secondary_startup_64+0xa4/0xb0 [ 54.601507][ T0] [ 54.604528][ T0] Reported by Kernel Concurrency Sanitizer on: [ 54.610835][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 54.619435][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.630064][ T0] ================================================================== [ 54.639650][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 54.646827][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 54.654163][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.664730][ T0] Call Trace: [ 54.668163][ T0] dump_stack+0xf5/0x159 [ 54.672443][ T0] panic+0x210/0x640 [ 54.676588][ T0] ? x86_64_start_reservations+0x29/0x2b [ 54.682541][ T0] ? vprintk_func+0x8d/0x140 [ 54.687986][ T0] kcsan_report.cold+0xc/0x10 [ 54.692679][ T0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 54.698522][ T0] __tsan_write1+0x32/0x40 [ 54.702965][ T0] timer_clear_idle+0x42/0x50 [ 54.707774][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 54.713688][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 54.718818][ T0] do_idle+0xb1/0x280 [ 54.722826][ T0] cpu_startup_entry+0x1b/0x20 [ 54.727588][ T0] rest_init+0xec/0xf6 [ 54.731652][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 54.739541][ T0] arch_call_rest_init+0x17/0x37 [ 54.744774][ T0] start_kernel+0x838/0x85e [ 54.749278][ T0] x86_64_start_reservations+0x29/0x2b [ 54.754984][ T0] x86_64_start_kernel+0x72/0x76 [ 54.759931][ T0] secondary_startup_64+0xa4/0xb0 [ 54.766541][ T0] Kernel Offset: disabled [ 54.770884][ T0] Rebooting in 86400 seconds..