[ 36.671487][ T25] audit: type=1800 audit(1572398904.823:25): pid=7128 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.721243][ T25] audit: type=1800 audit(1572398904.833:26): pid=7128 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.747642][ T25] audit: type=1800 audit(1572398904.833:27): pid=7128 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. [ 37.417329][ T7193] sshd (7193) used greatest stack depth: 10136 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.1.17' (ECDSA) to the list of known hosts. 2019/10/30 01:28:36 fuzzer started 2019/10/30 01:28:38 dialing manager at 10.128.0.105:40771 2019/10/30 01:28:38 syscalls: 2540 2019/10/30 01:28:38 code coverage: enabled 2019/10/30 01:28:38 comparison tracing: enabled 2019/10/30 01:28:38 extra coverage: extra coverage is not supported by the kernel 2019/10/30 01:28:38 setuid sandbox: enabled 2019/10/30 01:28:38 namespace sandbox: enabled syzkaller login: [ 50.249845][ T7283] ================================================================== [ 50.257960][ T7283] BUG: KCSAN: data-race in pipe_poll / pipe_write [ 50.264378][ T7283] [ 50.266728][ T7283] read to 0xffff888126a65338 of 4 bytes by task 7281 on cpu 0: [ 50.274247][ T7283] pipe_poll+0x84/0x1d0 [ 50.278380][ T7283] do_select+0x7d0/0x1020 [ 50.282687][ T7283] core_sys_select+0x381/0x550 [ 50.287427][ T7283] kern_select+0x106/0x170 [ 50.291821][ T7283] __x64_sys_select+0x70/0x90 [ 50.296476][ T7283] do_syscall_64+0xcc/0x370 [ 50.300954][ T7283] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 50.306833][ T7283] [ 50.309142][ T7283] write to 0xffff888126a65338 of 4 bytes by task 7283 on cpu 1: [ 50.316763][ T7283] pipe_write+0x268/0x970 [ 50.321067][ T7283] new_sync_write+0x388/0x4a0 [ 50.325722][ T7283] __vfs_write+0xb1/0xc0 [ 50.329939][ T7283] vfs_write+0x18a/0x390 [ 50.334183][ T7283] ksys_write+0xd5/0x1b0 [ 50.338399][ T7283] __x64_sys_write+0x4c/0x60 [ 50.342966][ T7283] do_syscall_64+0xcc/0x370 [ 50.347460][ T7283] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 50.353320][ T7283] [ 50.355639][ T7283] Reported by Kernel Concurrency Sanitizer on: [ 50.361768][ T7283] CPU: 1 PID: 7283 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 50.369195][ T7283] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.379225][ T7283] ================================================================== [ 50.387260][ T7283] Kernel panic - not syncing: panic_on_warn set ... [ 50.393823][ T7283] CPU: 1 PID: 7283 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 50.401251][ T7283] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.411281][ T7283] Call Trace: [ 50.414575][ T7283] dump_stack+0xf5/0x159 [ 50.418795][ T7283] panic+0x210/0x640 [ 50.422669][ T7283] ? vprintk_func+0x8d/0x140 [ 50.427253][ T7283] kcsan_report.cold+0xc/0x10 [ 50.431912][ T7283] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 50.437437][ T7283] __tsan_write4+0x32/0x40 [ 50.441850][ T7283] pipe_write+0x268/0x970 [ 50.446161][ T7283] new_sync_write+0x388/0x4a0 [ 50.450825][ T7283] __vfs_write+0xb1/0xc0 [ 50.455045][ T7283] vfs_write+0x18a/0x390 [ 50.459265][ T7283] ksys_write+0xd5/0x1b0 [ 50.463505][ T7283] __x64_sys_write+0x4c/0x60 [ 50.468074][ T7283] do_syscall_64+0xcc/0x370 [ 50.472562][ T7283] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 50.478429][ T7283] RIP: 0033:0x47c530 [ 50.482306][ T7283] 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 [ 50.502350][ T7283] RSP: 002b:000000c42007f938 EFLAGS: 00000216 ORIG_RAX: 0000000000000001 [ 50.510738][ T7283] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 50.518687][ T7283] RDX: 000000000000004b RSI: 000000c42029c380 RDI: 0000000000000002 [ 50.526637][ T7283] RBP: 000000c42007f990 R08: 0000000000000000 R09: 0000000000000000 [ 50.534588][ T7283] R10: 0000000000000000 R11: 0000000000000216 R12: ffffffffffffffff [ 50.542622][ T7283] R13: 0000000000000019 R14: 0000000000000018 R15: 0000000000000080 [ 50.552098][ T7283] Kernel Offset: disabled [ 50.556421][ T7283] Rebooting in 86400 seconds..