[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 44.724953][ T25] audit: type=1800 audit(1571603241.287:25): pid=7104 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 44.762214][ T25] audit: type=1800 audit(1571603241.287:26): pid=7104 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 44.786729][ T25] audit: type=1800 audit(1571603241.287:27): pid=7104 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 '10.128.0.240' (ECDSA) to the list of known hosts. 2019/10/20 20:27:30 fuzzer started 2019/10/20 20:27:31 dialing manager at 10.128.0.105:43535 2019/10/20 20:27:31 syscalls: 2524 2019/10/20 20:27:31 code coverage: enabled 2019/10/20 20:27:31 comparison tracing: enabled 2019/10/20 20:27:31 extra coverage: extra coverage is not supported by the kernel 2019/10/20 20:27:31 setuid sandbox: enabled 2019/10/20 20:27:31 namespace sandbox: enabled syzkaller login: [ 54.567920][ T7265] ================================================================== [ 54.576050][ T7265] BUG: KCSAN: data-race in pipe_poll / pipe_write [ 54.582435][ T7265] [ 54.584750][ T7265] read to 0xffff88811cf679f8 of 4 bytes by task 7249 on cpu 0: [ 54.592274][ T7265] pipe_poll+0x84/0x1d0 [ 54.596412][ T7265] do_select+0x7d0/0x1020 [ 54.600722][ T7265] core_sys_select+0x381/0x550 [ 54.605669][ T7265] kern_select+0x106/0x170 [ 54.610068][ T7265] __x64_sys_select+0x70/0x90 [ 54.614732][ T7265] do_syscall_64+0xcc/0x370 [ 54.619233][ T7265] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 54.625374][ T7265] [ 54.627700][ T7265] write to 0xffff88811cf679f8 of 4 bytes by task 7265 on cpu 1: [ 54.635319][ T7265] pipe_write+0x268/0x970 [ 54.639650][ T7265] new_sync_write+0x388/0x4a0 [ 54.644569][ T7265] __vfs_write+0xb1/0xc0 [ 54.648803][ T7265] vfs_write+0x18a/0x390 [ 54.653124][ T7265] ksys_write+0xd5/0x1b0 [ 54.657355][ T7265] __x64_sys_write+0x4c/0x60 [ 54.662475][ T7265] do_syscall_64+0xcc/0x370 [ 54.666981][ T7265] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 54.673407][ T7265] [ 54.675715][ T7265] Reported by Kernel Concurrency Sanitizer on: [ 54.681944][ T7265] CPU: 1 PID: 7265 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 54.690030][ T7265] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.700143][ T7265] ================================================================== [ 54.709806][ T7265] Kernel panic - not syncing: panic_on_warn set ... [ 54.716407][ T7265] CPU: 1 PID: 7265 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 54.723835][ T7265] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.733867][ T7265] Call Trace: [ 54.737155][ T7265] dump_stack+0xf5/0x159 [ 54.741398][ T7265] panic+0x210/0x640 [ 54.745286][ T7265] ? vprintk_func+0x8d/0x140 [ 54.749857][ T7265] kcsan_report.cold+0xc/0x10 [ 54.754519][ T7265] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 54.760076][ T7265] __tsan_write4+0x32/0x40 [ 54.764509][ T7265] pipe_write+0x268/0x970 [ 54.768827][ T7265] new_sync_write+0x388/0x4a0 [ 54.773508][ T7265] __vfs_write+0xb1/0xc0 [ 54.777992][ T7265] vfs_write+0x18a/0x390 [ 54.782586][ T7265] ksys_write+0xd5/0x1b0 [ 54.787164][ T7265] __x64_sys_write+0x4c/0x60 [ 54.791757][ T7265] do_syscall_64+0xcc/0x370 [ 54.796358][ T7265] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 54.802294][ T7265] RIP: 0033:0x47c530 [ 54.806448][ T7265] 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 [ 54.826404][ T7265] RSP: 002b:000000c42004b938 EFLAGS: 00000216 ORIG_RAX: 0000000000000001 [ 54.834796][ T7265] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 54.842760][ T7265] RDX: 000000000000004b RSI: 000000c42007c000 RDI: 0000000000000002 [ 54.853505][ T7265] RBP: 000000c42004b990 R08: 0000000000000000 R09: 0000000000000000 [ 54.861461][ T7265] R10: 0000000000000000 R11: 0000000000000216 R12: ffffffffffffffff [ 54.869434][ T7265] R13: 0000000000000006 R14: 0000000000000005 R15: 0000000000000080 [ 54.878950][ T7265] Kernel Offset: disabled [ 54.883282][ T7265] Rebooting in 86400 seconds..