[info] Using makefile-style concurrent boot in runlevel 2. [ 43.443918][ T23] audit: type=1800 audit(1571328495.256:21): pid=7079 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 43.489399][ T23] audit: type=1800 audit(1571328495.256:22): pid=7079 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] 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 '10.128.0.215' (ECDSA) to the list of known hosts. 2019/10/17 16:08:25 fuzzer started 2019/10/17 16:08:27 dialing manager at 10.128.0.105:43535 2019/10/17 16:08:27 syscalls: 2524 2019/10/17 16:08:27 code coverage: enabled 2019/10/17 16:08:27 comparison tracing: enabled 2019/10/17 16:08:27 extra coverage: extra coverage is not supported by the kernel 2019/10/17 16:08:27 setuid sandbox: enabled 2019/10/17 16:08:27 namespace sandbox: enabled 2019/10/17 16:08:27 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/17 16:08:27 fault injection: enabled 2019/10/17 16:08:27 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/17 16:08:27 net packet injection: enabled 2019/10/17 16:08:27 net device setup: enabled 2019/10/17 16:08:27 concurrency sanitizer: enabled syzkaller login: [ 57.128231][ T7235] ================================================================== [ 57.136366][ T7235] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 57.143294][ T7235] [ 57.145617][ T7235] write to 0xffff88812be1b6e4 of 1 bytes by task 0 on cpu 0: [ 57.153083][ T7235] timer_clear_idle+0x42/0x50 [ 57.157764][ T7235] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 57.163858][ T7235] tick_nohz_idle_exit+0x1af/0x1e0 [ 57.168967][ T7235] do_idle+0xb1/0x280 [ 57.172935][ T7235] cpu_startup_entry+0x1b/0x20 [ 57.177690][ T7235] rest_init+0xec/0xf6 [ 57.181748][ T7235] arch_call_rest_init+0x17/0x37 [ 57.186696][ T7235] start_kernel+0x838/0x85e [ 57.192923][ T7235] x86_64_start_reservations+0x29/0x2b [ 57.198392][ T7235] x86_64_start_kernel+0x72/0x76 [ 57.203333][ T7235] secondary_startup_64+0xa4/0xb0 [ 57.208338][ T7235] [ 57.210665][ T7235] read to 0xffff88812be1b6e4 of 1 bytes by task 7235 on cpu 1: [ 57.218198][ T7235] mod_timer+0x50d/0x7a0 [ 57.222446][ T7235] sk_reset_timer+0x2d/0x70 [ 57.226934][ T7235] tcp_rearm_rto.part.0+0x190/0x240 [ 57.232117][ T7235] tcp_rearm_rto+0x4f/0x60 [ 57.236536][ T7235] tcp_event_new_data_sent+0x1bb/0x1c0 [ 57.241996][ T7235] tcp_write_xmit+0xa16/0x3080 [ 57.246748][ T7235] __tcp_push_pending_frames+0x7b/0x1d0 [ 57.252279][ T7235] tcp_push+0x1e9/0x3d0 [ 57.256541][ T7235] tcp_sendmsg_locked+0x1d1e/0x1f30 [ 57.261726][ T7235] tcp_sendmsg+0x39/0x60 [ 57.265956][ T7235] inet_sendmsg+0x6d/0x90 [ 57.270369][ T7235] sock_sendmsg+0x9f/0xc0 [ 57.274688][ T7235] sock_write_iter+0x16b/0x210 [ 57.279429][ T7235] [ 57.281753][ T7235] Reported by Kernel Concurrency Sanitizer on: [ 57.287896][ T7235] CPU: 1 PID: 7235 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 57.295335][ T7235] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.305387][ T7235] ================================================================== [ 57.313468][ T7235] Kernel panic - not syncing: panic_on_warn set ... [ 57.320044][ T7235] CPU: 1 PID: 7235 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 57.327480][ T7235] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.337608][ T7235] Call Trace: [ 57.340895][ T7235] dump_stack+0xf5/0x159 [ 57.345126][ T7235] panic+0x210/0x640 [ 57.349016][ T7235] ? tcp_sendmsg_locked+0x1d1e/0x1f30 [ 57.354376][ T7235] ? vprintk_func+0x8d/0x140 [ 57.359077][ T7235] kcsan_report.cold+0xc/0x10 [ 57.363757][ T7235] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 57.369305][ T7235] __tsan_read1+0x2c/0x30 [ 57.373628][ T7235] mod_timer+0x50d/0x7a0 [ 57.377883][ T7235] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 57.383558][ T7235] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 57.389446][ T7235] sk_reset_timer+0x2d/0x70 [ 57.393956][ T7235] tcp_rearm_rto.part.0+0x190/0x240 [ 57.399233][ T7235] tcp_rearm_rto+0x4f/0x60 [ 57.403637][ T7235] tcp_event_new_data_sent+0x1bb/0x1c0 [ 57.409089][ T7235] tcp_write_xmit+0xa16/0x3080 [ 57.413845][ T7235] ? kmem_cache_alloc_node_trace+0x273/0x670 [ 57.419824][ T7235] __tcp_push_pending_frames+0x7b/0x1d0 [ 57.425446][ T7235] tcp_push+0x1e9/0x3d0 [ 57.429598][ T7235] tcp_sendmsg_locked+0x1d1e/0x1f30 [ 57.434799][ T7235] tcp_sendmsg+0x39/0x60 [ 57.439038][ T7235] inet_sendmsg+0x6d/0x90 [ 57.443354][ T7235] ? inet_send_prepare+0x200/0x200 [ 57.448458][ T7235] sock_sendmsg+0x9f/0xc0 [ 57.452780][ T7235] sock_write_iter+0x16b/0x210 [ 57.457682][ T7235] new_sync_write+0x388/0x4a0 [ 57.462366][ T7235] __vfs_write+0xb1/0xc0 [ 57.466622][ T7235] vfs_write+0x18a/0x390 [ 57.470857][ T7235] ksys_write+0xd5/0x1b0 [ 57.475093][ T7235] __x64_sys_write+0x4c/0x60 [ 57.479673][ T7235] do_syscall_64+0xcc/0x370 [ 57.484186][ T7235] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 57.490063][ T7235] RIP: 0033:0x47c530 [ 57.493953][ T7235] 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 [ 57.513560][ T7235] RSP: 002b:000000c4203074f8 EFLAGS: 00000216 ORIG_RAX: 0000000000000001 [ 57.521962][ T7235] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 57.530045][ T7235] RDX: 0000000000000008 RSI: 000000c4201705c0 RDI: 0000000000000003 [ 57.538006][ T7235] RBP: 000000c420307550 R08: 0000000000000000 R09: 0000000000000000 [ 57.545975][ T7235] R10: 0000000000000000 R11: 0000000000000216 R12: 000000c4200c3b00 [ 57.553945][ T7235] R13: 0000000000000007 R14: 0000000000c14060 R15: 00000000000015c5 [ 58.690622][ T7235] Shutting down cpus with NMI [ 58.696935][ T7235] Kernel Offset: disabled [ 58.701399][ T7235] Rebooting in 86400 seconds..