[ 36.429335][ T25] audit: type=1800 audit(1570778340.350:25): pid=7151 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.456665][ T25] audit: type=1800 audit(1570778340.350:26): pid=7151 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.483567][ T25] audit: type=1800 audit(1570778340.350:27): pid=7151 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. [ 37.008887][ T7216] sshd (7216) used greatest stack depth: 10032 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.101' (ECDSA) to the list of known hosts. 2019/10/11 07:19:10 fuzzer started 2019/10/11 07:19:12 dialing manager at 10.128.0.105:37331 2019/10/11 07:19:12 syscalls: 2523 2019/10/11 07:19:12 code coverage: enabled 2019/10/11 07:19:12 comparison tracing: enabled 2019/10/11 07:19:12 extra coverage: extra coverage is not supported by the kernel 2019/10/11 07:19:12 setuid sandbox: enabled 2019/10/11 07:19:12 namespace sandbox: enabled syzkaller login: [ 48.532394][ T7310] ================================================================== [ 48.540523][ T7310] BUG: KCSAN: data-race in pipe_poll / pipe_write [ 48.546968][ T7310] [ 48.549339][ T7310] read to 0xffff888125cb8ab8 of 4 bytes by task 7302 on cpu 0: [ 48.556929][ T7310] pipe_poll+0x84/0x1d0 [ 48.561226][ T7310] do_select+0x7d0/0x1020 [ 48.565537][ T7310] core_sys_select+0x38b/0x520 [ 48.570287][ T7310] kern_select+0x106/0x170 [ 48.574721][ T7310] __x64_sys_select+0x70/0x90 [ 48.579406][ T7310] do_syscall_64+0xcf/0x2f0 [ 48.583892][ T7310] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 48.589756][ T7310] [ 48.592075][ T7310] write to 0xffff888125cb8ab8 of 4 bytes by task 7310 on cpu 1: [ 48.599692][ T7310] pipe_write+0x268/0x970 [ 48.604013][ T7310] new_sync_write+0x388/0x4a0 [ 48.608667][ T7310] __vfs_write+0xb1/0xc0 [ 48.612885][ T7310] vfs_write+0x18a/0x390 [ 48.617304][ T7310] ksys_write+0xd5/0x1b0 [ 48.621525][ T7310] __x64_sys_write+0x4c/0x60 [ 48.626095][ T7310] do_syscall_64+0xcf/0x2f0 [ 48.630590][ T7310] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 48.636551][ T7310] [ 48.638855][ T7310] Reported by Kernel Concurrency Sanitizer on: [ 48.645011][ T7310] CPU: 1 PID: 7310 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 48.652185][ T7310] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.662229][ T7310] ================================================================== [ 48.670268][ T7310] Kernel panic - not syncing: panic_on_warn set ... [ 48.676850][ T7310] CPU: 1 PID: 7310 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 48.683928][ T7310] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.694391][ T7310] Call Trace: [ 48.697662][ T7310] dump_stack+0xf5/0x159 [ 48.701884][ T7310] panic+0x209/0x639 [ 48.705786][ T7310] ? vprintk_func+0x8d/0x140 [ 48.710371][ T7310] kcsan_report.cold+0xc/0x1b [ 48.715029][ T7310] __kcsan_setup_watchpoint+0x3ee/0x510 [ 48.720555][ T7310] __tsan_write4+0x32/0x40 [ 48.724952][ T7310] pipe_write+0x268/0x970 [ 48.729264][ T7310] new_sync_write+0x388/0x4a0 [ 48.734011][ T7310] __vfs_write+0xb1/0xc0 [ 48.738235][ T7310] vfs_write+0x18a/0x390 [ 48.742482][ T7310] ksys_write+0xd5/0x1b0 [ 48.746731][ T7310] __x64_sys_write+0x4c/0x60 [ 48.751305][ T7310] do_syscall_64+0xcf/0x2f0 [ 48.755804][ T7310] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 48.761676][ T7310] RIP: 0033:0x47c530 [ 48.765556][ T7310] 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 [ 48.785149][ T7310] RSP: 002b:000000c420051938 EFLAGS: 00000216 ORIG_RAX: 0000000000000001 [ 48.793540][ T7310] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 48.801488][ T7310] RDX: 000000000000004b RSI: 000000c42007c600 RDI: 0000000000000002 [ 48.809440][ T7310] RBP: 000000c420051990 R08: 0000000000000000 R09: 0000000000000000 [ 48.817390][ T7310] R10: 0000000000000000 R11: 0000000000000216 R12: ffffffffffffffff [ 48.825426][ T7310] R13: 0000000000000011 R14: 0000000000000010 R15: 0000000000000080 [ 48.834657][ T7310] Kernel Offset: disabled [ 48.839073][ T7310] Rebooting in 86400 seconds..