[ 36.006237][ T25] audit: type=1800 audit(1571129266.365:24): pid=7124 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. [ 36.544553][ T25] audit: type=1800 audit(1571129266.975:25): pid=7124 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.572005][ T25] audit: type=1800 audit(1571129266.975:26): pid=7124 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 '10.128.10.48' (ECDSA) to the list of known hosts. 2019/10/15 08:47:58 fuzzer started 2019/10/15 08:48:00 dialing manager at 10.128.0.105:33683 2019/10/15 08:48:00 syscalls: 2523 2019/10/15 08:48:00 code coverage: enabled 2019/10/15 08:48:00 comparison tracing: enabled 2019/10/15 08:48:00 extra coverage: extra coverage is not supported by the kernel 2019/10/15 08:48:00 setuid sandbox: enabled 2019/10/15 08:48:00 namespace sandbox: enabled syzkaller login: [ 50.327161][ T7284] ================================================================== [ 50.335281][ T7284] BUG: KCSAN: data-race in pipe_poll / pipe_write [ 50.341667][ T7284] [ 50.343977][ T7284] read to 0xffff888125729938 of 4 bytes by task 7275 on cpu 1: [ 50.351534][ T7284] pipe_poll+0x84/0x1d0 [ 50.355666][ T7284] do_select+0x7d0/0x1020 [ 50.359973][ T7284] core_sys_select+0x38b/0x520 [ 50.364713][ T7284] kern_select+0x106/0x170 [ 50.369106][ T7284] __x64_sys_select+0x70/0x90 [ 50.373763][ T7284] do_syscall_64+0xcf/0x2f0 [ 50.378251][ T7284] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 50.384110][ T7284] [ 50.386419][ T7284] write to 0xffff888125729938 of 4 bytes by task 7284 on cpu 0: [ 50.394026][ T7284] pipe_write+0x268/0x970 [ 50.398329][ T7284] new_sync_write+0x388/0x4a0 [ 50.402986][ T7284] __vfs_write+0xb1/0xc0 [ 50.407291][ T7284] vfs_write+0x18a/0x390 [ 50.411513][ T7284] ksys_write+0xd5/0x1b0 [ 50.415738][ T7284] __x64_sys_write+0x4c/0x60 [ 50.420318][ T7284] do_syscall_64+0xcf/0x2f0 [ 50.424802][ T7284] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 50.430664][ T7284] [ 50.432983][ T7284] Reported by Kernel Concurrency Sanitizer on: [ 50.439115][ T7284] CPU: 0 PID: 7284 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 50.446194][ T7284] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.456226][ T7284] ================================================================== [ 50.464276][ T7284] Kernel panic - not syncing: panic_on_warn set ... [ 50.470839][ T7284] CPU: 0 PID: 7284 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 50.477931][ T7284] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.487973][ T7284] Call Trace: [ 50.491242][ T7284] dump_stack+0xf5/0x159 [ 50.495467][ T7284] panic+0x209/0x639 [ 50.499347][ T7284] ? vprintk_func+0x8d/0x140 [ 50.503918][ T7284] kcsan_report.cold+0xc/0x1b [ 50.508574][ T7284] __kcsan_setup_watchpoint+0x3ee/0x510 [ 50.514096][ T7284] __tsan_write4+0x32/0x40 [ 50.518489][ T7284] pipe_write+0x268/0x970 [ 50.522801][ T7284] new_sync_write+0x388/0x4a0 [ 50.527549][ T7284] __vfs_write+0xb1/0xc0 [ 50.531798][ T7284] vfs_write+0x18a/0x390 [ 50.536026][ T7284] ksys_write+0xd5/0x1b0 [ 50.540253][ T7284] __x64_sys_write+0x4c/0x60 [ 50.544824][ T7284] do_syscall_64+0xcf/0x2f0 [ 50.549313][ T7284] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 50.555187][ T7284] RIP: 0033:0x47c530 [ 50.559062][ T7284] 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 [ 50.578642][ T7284] RSP: 002b:000000c4203b1938 EFLAGS: 00000216 ORIG_RAX: 0000000000000001 [ 50.587043][ T7284] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 50.594993][ T7284] RDX: 000000000000004b RSI: 000000c42008e280 RDI: 0000000000000002 [ 50.602942][ T7284] RBP: 000000c4203b1990 R08: 0000000000000000 R09: 0000000000000000 [ 50.610919][ T7284] R10: 0000000000000000 R11: 0000000000000216 R12: ffffffffffffffff [ 50.618870][ T7284] R13: 0000000000000014 R14: 0000000000000013 R15: 0000000000000080 [ 50.628086][ T7284] Kernel Offset: disabled [ 50.632404][ T7284] Rebooting in 86400 seconds..