[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.645707][ T26] audit: type=1800 audit(1570198331.413:25): pid=7091 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.673012][ T26] audit: type=1800 audit(1570198331.413:26): pid=7091 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.712704][ T26] audit: type=1800 audit(1570198331.413:27): pid=7091 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 '10.128.0.83' (ECDSA) to the list of known hosts. 2019/10/04 14:12:22 fuzzer started 2019/10/04 14:12:23 dialing manager at 10.128.0.105:44881 syzkaller login: [ 46.787408][ T7238] ================================================================== [ 46.795583][ T7238] BUG: KCSAN: data-race in pipe_poll / pipe_write [ 46.802011][ T7238] [ 46.804318][ T7238] write to 0xffff888122c70038 of 4 bytes by task 7243 on cpu 1: [ 46.811959][ T7238] pipe_write+0x268/0x970 [ 46.816269][ T7238] new_sync_write+0x388/0x4a0 [ 46.820921][ T7238] __vfs_write+0xb1/0xc0 [ 46.825139][ T7238] vfs_write+0x18a/0x390 [ 46.829356][ T7238] ksys_write+0xd5/0x1b0 [ 46.833575][ T7238] __x64_sys_write+0x4c/0x60 [ 46.838167][ T7238] do_syscall_64+0xcf/0x2f0 [ 46.842648][ T7238] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 46.848505][ T7238] [ 46.850841][ T7238] read to 0xffff888122c70038 of 4 bytes by task 7238 on cpu 0: [ 46.858380][ T7238] pipe_poll+0x84/0x1d0 [ 46.862513][ T7238] do_select+0x7d0/0x1020 [ 46.866844][ T7238] core_sys_select+0x38b/0x520 [ 46.871594][ T7238] kern_select+0x106/0x170 [ 46.875985][ T7238] __x64_sys_select+0x70/0x90 [ 46.880659][ T7238] do_syscall_64+0xcf/0x2f0 [ 46.885170][ T7238] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 46.891039][ T7238] [ 46.893348][ T7238] Reported by Kernel Concurrency Sanitizer on: [ 46.899481][ T7238] CPU: 0 PID: 7238 Comm: sshd Not tainted 5.3.0+ #0 [ 46.906045][ T7238] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.916074][ T7238] ================================================================== [ 46.924115][ T7238] Kernel panic - not syncing: panic_on_warn set ... [ 46.930676][ T7238] CPU: 0 PID: 7238 Comm: sshd Not tainted 5.3.0+ #0 [ 46.937229][ T7238] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.947254][ T7238] Call Trace: [ 46.950521][ T7238] dump_stack+0xf5/0x159 [ 46.954739][ T7238] panic+0x209/0x639 [ 46.958613][ T7238] ? vprintk_func+0x8d/0x140 [ 46.963189][ T7238] kcsan_report.cold+0x57/0xeb [ 46.967927][ T7238] __kcsan_setup_watchpoint+0x342/0x500 [ 46.973458][ T7238] ? generic_pipe_buf_confirm+0x20/0x20 [ 46.978976][ T7238] __tsan_read4+0x2c/0x30 [ 46.983282][ T7238] pipe_poll+0x84/0x1d0 [ 46.987412][ T7238] ? generic_pipe_buf_confirm+0x20/0x20 [ 46.992933][ T7238] do_select+0x7d0/0x1020 [ 46.997248][ T7238] ? set_fd_set.part.0+0x60/0x60 [ 47.002164][ T7238] ? set_fd_set.part.0+0x60/0x60 [ 47.007075][ T7238] ? set_fd_set.part.0+0x60/0x60 [ 47.011989][ T7238] ? set_fd_set.part.0+0x60/0x60 [ 47.016904][ T7238] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 47.022776][ T7238] ? __tsan_read8+0x2c/0x30 [ 47.027256][ T7238] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 47.032953][ T7238] ? __mark_inode_dirty+0x285/0x940 [ 47.038126][ T7238] ? __tsan_read8+0x2c/0x30 [ 47.042602][ T7238] ? check_stack_object+0xda/0x110 [ 47.047685][ T7238] ? __tsan_read8+0x2c/0x30 [ 47.052176][ T7238] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 47.058395][ T7238] core_sys_select+0x38b/0x520 [ 47.063136][ T7238] ? __tsan_read8+0x2c/0x30 [ 47.067612][ T7238] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 47.073477][ T7238] ? __tsan_write8+0x32/0x40 [ 47.078047][ T7238] ? ktime_get_ts64+0x286/0x2b0 [ 47.082874][ T7238] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 47.088588][ T7238] ? timespec64_add_safe+0xae/0xd0 [ 47.093679][ T7238] kern_select+0x106/0x170 [ 47.098074][ T7238] __x64_sys_select+0x70/0x90 [ 47.102727][ T7238] do_syscall_64+0xcf/0x2f0 [ 47.107209][ T7238] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 47.113077][ T7238] RIP: 0033:0x7f42d58e8dd3 [ 47.117472][ T7238] 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 [ 47.137059][ T7238] RSP: 002b:00007fff5b1744b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000017 [ 47.145447][ T7238] RAX: ffffffffffffffda RBX: 00007fff5b174540 RCX: 00007f42d58e8dd3 [ 47.154087][ T7238] RDX: 0000561fbde0ab10 RSI: 0000561fbde0ab30 RDI: 000000000000000c [ 47.162032][ T7238] RBP: 0000561fbc9a98dc R08: 00007fff5b1744e0 R09: 0101010101010101 [ 47.169975][ T7238] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff5b174548 [ 47.177919][ T7238] R13: 0000000000000000 R14: 00007fff5b174538 R15: 00007fff5b17453c [ 47.187002][ T7238] Kernel Offset: disabled [ 47.191336][ T7238] Rebooting in 86400 seconds..