[ 34.820769][ T26] audit: type=1800 audit(1571388784.188:24): pid=7212 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="sudo" dev="sda1" ino=2487 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.340812][ T26] audit: type=1800 audit(1571388784.788:25): pid=7212 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.372072][ T26] audit: type=1800 audit(1571388784.788:26): pid=7212 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 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 '10.128.10.57' (ECDSA) to the list of known hosts. 2019/10/18 08:53:12 fuzzer started 2019/10/18 08:53:14 dialing manager at 10.128.0.105:43535 2019/10/18 08:53:14 syscalls: 2524 2019/10/18 08:53:14 code coverage: enabled 2019/10/18 08:53:14 comparison tracing: enabled 2019/10/18 08:53:14 extra coverage: extra coverage is not supported by the kernel 2019/10/18 08:53:14 setuid sandbox: enabled 2019/10/18 08:53:14 namespace sandbox: enabled 2019/10/18 08:53:14 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/18 08:53:14 fault injection: enabled 2019/10/18 08:53:14 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled syzkaller login: [ 45.482843][ T7365] ================================================================== [ 45.490968][ T7365] BUG: KCSAN: data-race in pipe_poll / pipe_write [ 45.497356][ T7365] [ 45.499664][ T7365] read to 0xffff888126a10b78 of 4 bytes by task 7358 on cpu 1: [ 45.507194][ T7365] pipe_poll+0x84/0x1d0 [ 45.511346][ T7365] do_select+0x7d0/0x1020 [ 45.515654][ T7365] core_sys_select+0x381/0x550 [ 45.520392][ T7365] kern_select+0x106/0x170 [ 45.524796][ T7365] __x64_sys_select+0x70/0x90 [ 45.529450][ T7365] do_syscall_64+0xcc/0x370 [ 45.533933][ T7365] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 45.539800][ T7365] [ 45.542115][ T7365] write to 0xffff888126a10b78 of 4 bytes by task 7365 on cpu 0: [ 45.549793][ T7365] pipe_write+0x268/0x970 [ 45.554115][ T7365] new_sync_write+0x388/0x4a0 [ 45.558768][ T7365] __vfs_write+0xb1/0xc0 [ 45.562991][ T7365] vfs_write+0x18a/0x390 [ 45.567231][ T7365] ksys_write+0xd5/0x1b0 [ 45.571451][ T7365] __x64_sys_write+0x4c/0x60 [ 45.576021][ T7365] do_syscall_64+0xcc/0x370 [ 45.580504][ T7365] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 45.586375][ T7365] [ 45.588675][ T7365] Reported by Kernel Concurrency Sanitizer on: [ 45.594805][ T7365] CPU: 0 PID: 7365 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 45.602240][ T7365] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.612279][ T7365] ================================================================== [ 45.620328][ T7365] Kernel panic - not syncing: panic_on_warn set ... [ 45.626899][ T7365] CPU: 0 PID: 7365 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 45.634337][ T7365] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.644366][ T7365] Call Trace: [ 45.647658][ T7365] dump_stack+0xf5/0x159 [ 45.651885][ T7365] panic+0x210/0x640 [ 45.655783][ T7365] ? vprintk_func+0x8d/0x140 [ 45.660353][ T7365] kcsan_report.cold+0xc/0x10 [ 45.665009][ T7365] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 45.670544][ T7365] __tsan_write4+0x32/0x40 [ 45.674944][ T7365] pipe_write+0x268/0x970 [ 45.679269][ T7365] new_sync_write+0x388/0x4a0 [ 45.683942][ T7365] __vfs_write+0xb1/0xc0 [ 45.688171][ T7365] vfs_write+0x18a/0x390 [ 45.692407][ T7365] ksys_write+0xd5/0x1b0 [ 45.696633][ T7365] __x64_sys_write+0x4c/0x60 [ 45.701205][ T7365] do_syscall_64+0xcc/0x370 [ 45.705688][ T7365] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 45.711556][ T7365] RIP: 0033:0x47c530 [ 45.715431][ T7365] 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 [ 45.735011][ T7365] RSP: 002b:000000c42038b938 EFLAGS: 00000216 ORIG_RAX: 0000000000000001 [ 45.743398][ T7365] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 45.751345][ T7365] RDX: 0000000000000032 RSI: 000000c42007c000 RDI: 0000000000000002 [ 45.759302][ T7365] RBP: 000000c42038b990 R08: 0000000000000000 R09: 0000000000000000 [ 45.767248][ T7365] R10: 0000000000000000 R11: 0000000000000216 R12: ffffffffffffffff [ 45.775198][ T7365] R13: 000000000000000c R14: 000000000000000b R15: 0000000000000100 [ 45.784570][ T7365] Kernel Offset: disabled [ 45.788922][ T7365] Rebooting in 86400 seconds..