[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.898631][ T25] audit: type=1800 audit(1571084538.345:25): pid=7052 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.925843][ T25] audit: type=1800 audit(1571084538.345:26): pid=7052 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.952805][ T25] audit: type=1800 audit(1571084538.345:27): pid=7052 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 '10.128.1.34' (ECDSA) to the list of known hosts. 2019/10/14 20:22:29 fuzzer started 2019/10/14 20:22:30 dialing manager at 10.128.0.105:43961 2019/10/14 20:22:30 syscalls: 2523 syzkaller login: [ 46.977909][ T7198] ================================================================== [ 46.986050][ T7198] BUG: KCSAN: data-race in pipe_poll / pipe_write [ 46.992448][ T7198] [ 46.994773][ T7198] write to 0xffff8881267f4c38 of 4 bytes by task 7214 on cpu 0: [ 47.002414][ T7198] pipe_write+0x268/0x970 [ 47.006747][ T7198] new_sync_write+0x388/0x4a0 [ 47.011443][ T7198] __vfs_write+0xb1/0xc0 [ 47.015682][ T7198] vfs_write+0x18a/0x390 [ 47.019924][ T7198] ksys_write+0xd5/0x1b0 [ 47.024163][ T7198] __x64_sys_write+0x4c/0x60 [ 47.028755][ T7198] do_syscall_64+0xcf/0x2f0 [ 47.033261][ T7198] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 47.039140][ T7198] [ 47.041479][ T7198] read to 0xffff8881267f4c38 of 4 bytes by task 7198 on cpu 1: [ 47.049016][ T7198] pipe_poll+0x84/0x1d0 [ 47.053175][ T7198] do_select+0x7d0/0x1020 [ 47.057503][ T7198] core_sys_select+0x38b/0x520 [ 47.062271][ T7198] kern_select+0x106/0x170 [ 47.066774][ T7198] __x64_sys_select+0x70/0x90 [ 47.071446][ T7198] do_syscall_64+0xcf/0x2f0 [ 47.075952][ T7198] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 47.081825][ T7198] [ 47.084143][ T7198] Reported by Kernel Concurrency Sanitizer on: [ 47.090295][ T7198] CPU: 1 PID: 7198 Comm: sshd Not tainted 5.3.0+ #0 [ 47.096870][ T7198] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.106919][ T7198] ================================================================== [ 47.114971][ T7198] Kernel panic - not syncing: panic_on_warn set ... [ 47.121556][ T7198] CPU: 1 PID: 7198 Comm: sshd Not tainted 5.3.0+ #0 [ 47.128145][ T7198] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.138190][ T7198] Call Trace: [ 47.141494][ T7198] dump_stack+0xf5/0x159 [ 47.145743][ T7198] panic+0x209/0x639 [ 47.149644][ T7198] ? vprintk_func+0x8d/0x140 [ 47.154240][ T7198] kcsan_report.cold+0xc/0x1b [ 47.158922][ T7198] __kcsan_setup_watchpoint+0x3ee/0x510 [ 47.164500][ T7198] ? generic_pipe_buf_confirm+0x20/0x20 [ 47.170035][ T7198] __tsan_read4+0x2c/0x30 [ 47.174540][ T7198] pipe_poll+0x84/0x1d0 [ 47.178700][ T7198] ? generic_pipe_buf_confirm+0x20/0x20 [ 47.184242][ T7198] do_select+0x7d0/0x1020 [ 47.188606][ T7198] ? set_fd_set.part.0+0x60/0x60 [ 47.193545][ T7198] ? set_fd_set.part.0+0x60/0x60 [ 47.198489][ T7198] ? set_fd_set.part.0+0x60/0x60 [ 47.203431][ T7198] ? set_fd_set.part.0+0x60/0x60 [ 47.208368][ T7198] ? __kcsan_setup_watchpoint+0x96/0x510 [ 47.213997][ T7198] ? __kcsan_setup_watchpoint+0x96/0x510 [ 47.219631][ T7198] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 47.225547][ T7198] ? __kcsan_setup_watchpoint+0x96/0x510 [ 47.231181][ T7198] ? __tsan_read4+0x2c/0x30 [ 47.235675][ T7198] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 47.241386][ T7198] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.247623][ T7198] ? __kcsan_setup_watchpoint+0x96/0x510 [ 47.253253][ T7198] ? timespec64_trunc+0x88/0xc0 [ 47.258103][ T7198] ? __kcsan_setup_watchpoint+0x96/0x510 [ 47.263735][ T7198] ? __tsan_read8+0x2c/0x30 [ 47.268237][ T7198] ? __kcsan_setup_watchpoint+0x96/0x510 [ 47.273870][ T7198] ? check_stack_object+0xda/0x110 [ 47.278980][ T7198] ? __kcsan_setup_watchpoint+0x96/0x510 [ 47.284610][ T7198] ? __tsan_read8+0x2c/0x30 [ 47.289112][ T7198] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 47.295363][ T7198] core_sys_select+0x38b/0x520 [ 47.300135][ T7198] ? __kcsan_setup_watchpoint+0x96/0x510 [ 47.305940][ T7198] ? __tsan_read8+0x2c/0x30 [ 47.310449][ T7198] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 47.316337][ T7198] ? __tsan_write8+0x32/0x40 [ 47.320925][ T7198] ? ktime_get_ts64+0x286/0x2b0 [ 47.325776][ T7198] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 47.331495][ T7198] ? timespec64_add_safe+0xae/0xd0 [ 47.336664][ T7198] kern_select+0x106/0x170 [ 47.341079][ T7198] __x64_sys_select+0x70/0x90 [ 47.345757][ T7198] do_syscall_64+0xcf/0x2f0 [ 47.350267][ T7198] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 47.356154][ T7198] RIP: 0033:0x7f7b62c9bdd3 [ 47.360563][ T7198] 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 [ 47.380159][ T7198] RSP: 002b:00007ffc451c7618 EFLAGS: 00000246 ORIG_RAX: 0000000000000017 [ 47.388576][ T7198] RAX: ffffffffffffffda RBX: 00007ffc451c76a0 RCX: 00007f7b62c9bdd3 [ 47.396569][ T7198] RDX: 00005558d2d2db00 RSI: 00005558d2d2db20 RDI: 000000000000000c [ 47.404539][ T7198] RBP: 00005558d139b8dc R08: 00007ffc451c7640 R09: 0101010101010101 [ 47.412509][ T7198] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc451c76a8 [ 47.420483][ T7198] R13: 0000000000000000 R14: 00007ffc451c7698 R15: 00007ffc451c769c [ 47.429782][ T7198] Kernel Offset: disabled [ 47.434142][ T7198] Rebooting in 86400 seconds..