[info] Using makefile-style concurrent boot in runlevel 2. [ 43.798087][ T26] audit: type=1800 audit(1570487094.778:21): pid=7116 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 43.845792][ T26] audit: type=1800 audit(1570487094.778:22): pid=7116 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 '10.128.0.96' (ECDSA) to the list of known hosts. 2019/10/07 22:25:07 fuzzer started 2019/10/07 22:25:08 dialing manager at 10.128.0.105:39369 syzkaller login: [ 57.926808][ T7264] ================================================================== [ 57.935066][ T7264] BUG: KCSAN: data-race in pipe_poll / pipe_write [ 57.941447][ T7264] [ 57.943848][ T7264] write to 0xffff88811d7a93f8 of 4 bytes by task 7271 on cpu 1: [ 57.951493][ T7264] pipe_write+0x268/0x970 [ 57.955807][ T7264] new_sync_write+0x388/0x4a0 [ 57.962038][ T7264] __vfs_write+0xb1/0xc0 [ 57.966272][ T7264] vfs_write+0x18a/0x390 [ 57.970487][ T7264] ksys_write+0xd5/0x1b0 [ 57.974715][ T7264] __x64_sys_write+0x4c/0x60 [ 57.979301][ T7264] do_syscall_64+0xcf/0x2f0 [ 57.983782][ T7264] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 57.989643][ T7264] [ 57.991948][ T7264] read to 0xffff88811d7a93f8 of 4 bytes by task 7264 on cpu 0: [ 57.999562][ T7264] pipe_poll+0x84/0x1d0 [ 58.003696][ T7264] do_select+0x7d0/0x1020 [ 58.008011][ T7264] core_sys_select+0x38b/0x520 [ 58.012751][ T7264] kern_select+0x106/0x170 [ 58.017143][ T7264] __x64_sys_select+0x70/0x90 [ 58.021805][ T7264] do_syscall_64+0xcf/0x2f0 [ 58.026284][ T7264] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 58.032142][ T7264] [ 58.034444][ T7264] Reported by Kernel Concurrency Sanitizer on: [ 58.040570][ T7264] CPU: 0 PID: 7264 Comm: sshd Not tainted 5.3.0+ #0 [ 58.047145][ T7264] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.057171][ T7264] ================================================================== [ 58.065217][ T7264] Kernel panic - not syncing: panic_on_warn set ... [ 58.071777][ T7264] CPU: 0 PID: 7264 Comm: sshd Not tainted 5.3.0+ #0 [ 58.078349][ T7264] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.088377][ T7264] Call Trace: [ 58.091646][ T7264] dump_stack+0xf5/0x159 [ 58.095872][ T7264] panic+0x209/0x639 [ 58.099748][ T7264] ? vprintk_func+0x8d/0x140 [ 58.104316][ T7264] kcsan_report.cold+0x57/0xeb [ 58.109082][ T7264] __kcsan_setup_watchpoint+0x342/0x500 [ 58.114609][ T7264] ? generic_pipe_buf_confirm+0x20/0x20 [ 58.120129][ T7264] __tsan_read4+0x2c/0x30 [ 58.124433][ T7264] pipe_poll+0x84/0x1d0 [ 58.128575][ T7264] ? generic_pipe_buf_confirm+0x20/0x20 [ 58.134098][ T7264] do_select+0x7d0/0x1020 [ 58.138418][ T7264] ? set_fd_set.part.0+0x60/0x60 [ 58.143332][ T7264] ? set_fd_set.part.0+0x60/0x60 [ 58.148245][ T7264] ? set_fd_set.part.0+0x60/0x60 [ 58.153162][ T7264] ? set_fd_set.part.0+0x60/0x60 [ 58.158088][ T7264] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 58.163956][ T7264] ? __tsan_read8+0x2c/0x30 [ 58.168436][ T7264] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 58.174132][ T7264] ? __mark_inode_dirty+0x285/0x940 [ 58.179306][ T7264] ? __tsan_read8+0x2c/0x30 [ 58.183785][ T7264] ? check_stack_object+0xda/0x110 [ 58.188869][ T7264] ? __tsan_read8+0x2c/0x30 [ 58.193352][ T7264] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 58.199567][ T7264] core_sys_select+0x38b/0x520 [ 58.204310][ T7264] ? __tsan_read8+0x2c/0x30 [ 58.208790][ T7264] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 58.214656][ T7264] ? __tsan_write8+0x32/0x40 [ 58.219220][ T7264] ? ktime_get_ts64+0x286/0x2b0 [ 58.224052][ T7264] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 58.229745][ T7264] ? timespec64_add_safe+0xae/0xd0 [ 58.234833][ T7264] kern_select+0x106/0x170 [ 58.239229][ T7264] __x64_sys_select+0x70/0x90 [ 58.243886][ T7264] do_syscall_64+0xcf/0x2f0 [ 58.248368][ T7264] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 58.254232][ T7264] RIP: 0033:0x7f9f2120fdd3 [ 58.258631][ T7264] Code: 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 90 90 90 90 90 90 90 90 90 83 3d 25 48 2b 00 00 75 13 49 89 ca b8 17 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 34 c3 48 83 ec 08 e8 ab 2f 01 00 48 89 04 24 [ 58.278219][ T7264] RSP: 002b:00007fff4778df98 EFLAGS: 00000246 ORIG_RAX: 0000000000000017 [ 58.286612][ T7264] RAX: ffffffffffffffda RBX: 00007fff4778e020 RCX: 00007f9f2120fdd3 [ 58.294561][ T7264] RDX: 000055bb51f55af0 RSI: 000055bb51f55b10 RDI: 000000000000000c [ 58.302507][ T7264] RBP: 000055bb514fd8dc R08: 00007fff4778dfc0 R09: 0101010101010101 [ 58.310454][ T7264] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff4778e028 [ 58.318492][ T7264] R13: 0000000000000000 R14: 00007fff4778e018 R15: 00007fff4778e01c [ 58.327721][ T7264] Kernel Offset: disabled [ 58.332068][ T7264] Rebooting in 86400 seconds..