[ 39.415185][ T25] audit: type=1800 audit(1570717646.163:24): pid=7167 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. [ 39.948844][ T25] audit: type=1800 audit(1570717646.773:25): pid=7167 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 39.977640][ T25] audit: type=1800 audit(1570717646.773:26): pid=7167 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 '10.128.0.220' (ECDSA) to the list of known hosts. 2019/10/10 14:27:37 fuzzer started 2019/10/10 14:27:39 dialing manager at 10.128.0.105:34287 2019/10/10 14:27:39 syscalls: 2523 2019/10/10 14:27:39 code coverage: enabled 2019/10/10 14:27:39 comparison tracing: enabled 2019/10/10 14:27:39 extra coverage: extra coverage is not supported by the kernel 2019/10/10 14:27:39 setuid sandbox: enabled 2019/10/10 14:27:39 namespace sandbox: enabled 2019/10/10 14:27:39 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/10 14:27:39 fault injection: enabled 2019/10/10 14:27:39 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/10 14:27:39 net packet injection: enabled 2019/10/10 14:27:39 net device setup: enabled 2019/10/10 14:27:39 concurrency sanitizer: enabled syzkaller login: [ 52.963437][ T7332] ================================================================== [ 52.971570][ T7332] BUG: KCSAN: data-race in tcp_poll / tcp_recvmsg [ 52.977998][ T7332] [ 52.980310][ T7332] read to 0xffff888123f265f4 of 4 bytes by task 7317 on cpu 1: [ 52.987832][ T7332] tcp_poll+0x1cc/0x6b0 [ 52.991963][ T7332] sock_poll+0xed/0x250 [ 52.996184][ T7332] ep_item_poll.isra.0+0x90/0x190 [ 53.001185][ T7332] ep_send_events_proc+0x113/0x5c0 [ 53.006271][ T7332] ep_scan_ready_list.constprop.0+0x189/0x500 [ 53.012348][ T7332] ep_poll+0xe3/0x900 [ 53.016306][ T7332] do_epoll_wait+0x162/0x180 [ 53.020876][ T7332] __x64_sys_epoll_pwait+0xcd/0x170 [ 53.026063][ T7332] do_syscall_64+0xcf/0x2f0 [ 53.030548][ T7332] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.036408][ T7332] [ 53.038727][ T7332] write to 0xffff888123f265f4 of 4 bytes by task 7332 on cpu 0: [ 53.046332][ T7332] tcp_recvmsg+0xd86/0x1a30 [ 53.050813][ T7332] inet_recvmsg+0xbb/0x250 [ 53.055203][ T7332] sock_recvmsg+0x92/0xb0 [ 53.059508][ T7332] sock_read_iter+0x15f/0x1e0 [ 53.064160][ T7332] new_sync_read+0x389/0x4f0 [ 53.068726][ T7332] __vfs_read+0xb1/0xc0 [ 53.072869][ T7332] vfs_read+0x143/0x2c0 [ 53.076998][ T7332] ksys_read+0xd5/0x1b0 [ 53.081219][ T7332] __x64_sys_read+0x4c/0x60 [ 53.085707][ T7332] do_syscall_64+0xcf/0x2f0 [ 53.090191][ T7332] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.096052][ T7332] [ 53.098354][ T7332] Reported by Kernel Concurrency Sanitizer on: [ 53.104494][ T7332] CPU: 0 PID: 7332 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 53.111585][ T7332] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.121619][ T7332] ================================================================== [ 53.129654][ T7332] Kernel panic - not syncing: panic_on_warn set ... [ 53.136218][ T7332] CPU: 0 PID: 7332 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 53.143311][ T7332] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.153353][ T7332] Call Trace: [ 53.156627][ T7332] dump_stack+0xf5/0x159 [ 53.160863][ T7332] panic+0x209/0x639 [ 53.164748][ T7332] ? __x64_sys_read+0x4c/0x60 [ 53.169405][ T7332] ? vprintk_func+0x8d/0x140 [ 53.173977][ T7332] kcsan_report.cold+0xc/0x1b [ 53.178634][ T7332] __kcsan_setup_watchpoint+0x3ee/0x510 [ 53.184159][ T7332] __tsan_write4+0x32/0x40 [ 53.188564][ T7332] tcp_recvmsg+0xd86/0x1a30 [ 53.193050][ T7332] ? __kcsan_setup_watchpoint+0x96/0x510 [ 53.198662][ T7332] inet_recvmsg+0xbb/0x250 [ 53.203051][ T7332] ? __tsan_read8+0x2c/0x30 [ 53.207542][ T7332] ? inet_sendpage+0x100/0x100 [ 53.212283][ T7332] sock_recvmsg+0x92/0xb0 [ 53.216591][ T7332] sock_read_iter+0x15f/0x1e0 [ 53.221256][ T7332] new_sync_read+0x389/0x4f0 [ 53.225829][ T7332] __vfs_read+0xb1/0xc0 [ 53.229979][ T7332] vfs_read+0x143/0x2c0 [ 53.234115][ T7332] ksys_read+0xd5/0x1b0 [ 53.238262][ T7332] __x64_sys_read+0x4c/0x60 [ 53.242760][ T7332] do_syscall_64+0xcf/0x2f0 [ 53.247343][ T7332] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.253214][ T7332] RIP: 0033:0x47c530 [ 53.257088][ T7332] 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 [ 53.276666][ T7332] RSP: 002b:000000c42020d7d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 53.285053][ T7332] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 53.293002][ T7332] RDX: 0000000000001000 RSI: 000000c42023e000 RDI: 0000000000000003 [ 53.300950][ T7332] RBP: 000000c42020d830 R08: 0000000000000000 R09: 0000000000000000 [ 53.308911][ T7332] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000008 [ 53.316857][ T7332] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 53.326077][ T7332] Kernel Offset: disabled [ 53.330397][ T7332] Rebooting in 86400 seconds..