[ 42.633766][ T26] audit: type=1800 audit(1576057104.459:21): pid=7441 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 42.675244][ T26] audit: type=1800 audit(1576057104.459:22): pid=7441 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [ 43.947958][ T7509] sshd (7509) used greatest stack depth: 10128 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.142' (ECDSA) to the list of known hosts. 2019/12/11 09:38:37 fuzzer started 2019/12/11 09:38:39 dialing manager at 10.128.0.105:37821 2019/12/11 09:38:39 syscalls: 2689 2019/12/11 09:38:39 code coverage: enabled 2019/12/11 09:38:39 comparison tracing: enabled 2019/12/11 09:38:39 extra coverage: extra coverage is not supported by the kernel 2019/12/11 09:38:39 setuid sandbox: enabled syzkaller login: [ 58.106510][ T7605] ================================================================== [ 58.114754][ T7605] BUG: KCSAN: data-race in pipe_poll / pipe_write [ 58.121137][ T7605] [ 58.123447][ T7605] read to 0xffff8881261000f8 of 4 bytes by task 7588 on cpu 0: [ 58.131176][ T7605] pipe_poll+0x84/0x1d0 [ 58.135313][ T7605] do_select+0x7d0/0x1020 [ 58.139620][ T7605] core_sys_select+0x381/0x550 [ 58.144363][ T7605] kern_select+0x106/0x170 [ 58.148758][ T7605] __x64_sys_select+0x70/0x90 [ 58.153440][ T7605] do_syscall_64+0xcc/0x370 [ 58.157932][ T7605] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 58.163796][ T7605] [ 58.166109][ T7605] write to 0xffff8881261000f8 of 4 bytes by task 7605 on cpu 1: [ 58.173717][ T7605] pipe_write+0x268/0x970 [ 58.178027][ T7605] new_sync_write+0x388/0x4a0 [ 58.182695][ T7605] __vfs_write+0xb1/0xc0 [ 58.186928][ T7605] vfs_write+0x18a/0x390 [ 58.191150][ T7605] ksys_write+0xd5/0x1b0 [ 58.195369][ T7605] __x64_sys_write+0x4c/0x60 [ 58.199940][ T7605] do_syscall_64+0xcc/0x370 [ 58.204536][ T7605] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 58.210396][ T7605] [ 58.212703][ T7605] Reported by Kernel Concurrency Sanitizer on: [ 58.218835][ T7605] CPU: 1 PID: 7605 Comm: syz-fuzzer Not tainted 5.4.0-syzkaller #0 [ 58.226715][ T7605] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.236746][ T7605] ================================================================== [ 58.244783][ T7605] Kernel panic - not syncing: panic_on_warn set ... [ 58.251361][ T7605] CPU: 1 PID: 7605 Comm: syz-fuzzer Not tainted 5.4.0-syzkaller #0 [ 58.259231][ T7605] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.269268][ T7605] Call Trace: [ 58.272546][ T7605] dump_stack+0x11d/0x181 [ 58.276866][ T7605] panic+0x210/0x640 [ 58.280745][ T7605] ? vprintk_func+0x8d/0x140 [ 58.285434][ T7605] kcsan_report.cold+0xc/0xd [ 58.290050][ T7605] kcsan_setup_watchpoint+0x3fe/0x460 [ 58.295407][ T7605] __tsan_unaligned_write4+0xc4/0x100 [ 58.300759][ T7605] pipe_write+0x268/0x970 [ 58.305071][ T7605] new_sync_write+0x388/0x4a0 [ 58.309779][ T7605] __vfs_write+0xb1/0xc0 [ 58.314004][ T7605] vfs_write+0x18a/0x390 [ 58.318227][ T7605] ksys_write+0xd5/0x1b0 [ 58.322451][ T7605] __x64_sys_write+0x4c/0x60 [ 58.327022][ T7605] do_syscall_64+0xcc/0x370 [ 58.331509][ T7605] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 58.337415][ T7605] RIP: 0033:0x47c530 [ 58.341295][ T7605] 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 [ 58.360884][ T7605] RSP: 002b:000000c420051938 EFLAGS: 00000216 ORIG_RAX: 0000000000000001 [ 58.369279][ T7605] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 58.377246][ T7605] RDX: 000000000000002f RSI: 000000c420080000 RDI: 0000000000000002 [ 58.385219][ T7605] RBP: 000000c420051990 R08: 0000000000000000 R09: 0000000000000000 [ 58.393191][ T7605] R10: 0000000000000000 R11: 0000000000000216 R12: ffffffffffffffff [ 58.401144][ T7605] R13: 000000000000001c R14: 000000000000001b R15: 0000000000000100 [ 58.410380][ T7605] Kernel Offset: disabled [ 58.414872][ T7605] Rebooting in 86400 seconds..