[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.141936][ T25] audit: type=1800 audit(1571326592.941:25): pid=7036 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.161670][ T25] audit: type=1800 audit(1571326592.941:26): pid=7036 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.183223][ T25] audit: type=1800 audit(1571326592.941:27): pid=7036 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 '10.128.0.178' (ECDSA) to the list of known hosts. 2019/10/17 15:36:43 fuzzer started 2019/10/17 15:36:45 dialing manager at 10.128.0.105:43535 2019/10/17 15:36:45 syscalls: 2524 2019/10/17 15:36:45 code coverage: enabled 2019/10/17 15:36:45 comparison tracing: enabled 2019/10/17 15:36:45 extra coverage: extra coverage is not supported by the kernel 2019/10/17 15:36:45 setuid sandbox: enabled 2019/10/17 15:36:45 namespace sandbox: enabled 2019/10/17 15:36:45 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/17 15:36:45 fault injection: enabled 2019/10/17 15:36:45 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/17 15:36:45 net packet injection: enabled 2019/10/17 15:36:45 net device setup: enabled 2019/10/17 15:36:45 concurrency sanitizer: enabled syzkaller login: [ 48.117868][ T7200] ================================================================== [ 48.126009][ T7200] BUG: KCSAN: data-race in tcp_poll / tcp_recvmsg [ 48.132410][ T7200] [ 48.134744][ T7200] write to 0xffff8881265dae7c of 4 bytes by task 7202 on cpu 0: [ 48.142377][ T7200] tcp_recvmsg+0xd86/0x1a30 [ 48.146876][ T7200] inet_recvmsg+0xbb/0x250 [ 48.151294][ T7200] sock_recvmsg+0x92/0xb0 [ 48.155612][ T7200] sock_read_iter+0x15f/0x1e0 [ 48.160267][ T7200] new_sync_read+0x389/0x4f0 [ 48.164876][ T7200] __vfs_read+0xb1/0xc0 [ 48.169008][ T7200] vfs_read+0x143/0x2c0 [ 48.173144][ T7200] ksys_read+0xd5/0x1b0 [ 48.177277][ T7200] __x64_sys_read+0x4c/0x60 [ 48.181797][ T7200] do_syscall_64+0xcc/0x370 [ 48.186273][ T7200] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 48.192138][ T7200] [ 48.194447][ T7200] read to 0xffff8881265dae7c of 4 bytes by task 7200 on cpu 1: [ 48.201983][ T7200] tcp_poll+0x1cc/0x6b0 [ 48.206171][ T7200] sock_poll+0xed/0x250 [ 48.210307][ T7200] ep_item_poll.isra.0+0x90/0x190 [ 48.215308][ T7200] ep_send_events_proc+0x113/0x590 [ 48.220409][ T7200] ep_scan_ready_list.constprop.0+0x189/0x500 [ 48.226452][ T7200] ep_poll+0xe3/0x900 [ 48.230411][ T7200] do_epoll_wait+0x162/0x180 [ 48.234977][ T7200] __x64_sys_epoll_pwait+0xcd/0x180 [ 48.240153][ T7200] do_syscall_64+0xcc/0x370 [ 48.244633][ T7200] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 48.250496][ T7200] [ 48.252798][ T7200] Reported by Kernel Concurrency Sanitizer on: [ 48.259038][ T7200] CPU: 1 PID: 7200 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 48.266482][ T7200] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.276515][ T7200] ================================================================== [ 48.284563][ T7200] Kernel panic - not syncing: panic_on_warn set ... [ 48.291131][ T7200] CPU: 1 PID: 7200 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 48.298558][ T7200] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.308587][ T7200] Call Trace: [ 48.311858][ T7200] dump_stack+0xf5/0x159 [ 48.316076][ T7200] panic+0x210/0x640 [ 48.319952][ T7200] ? do_syscall_64+0xcc/0x370 [ 48.324956][ T7200] ? vprintk_func+0x8d/0x140 [ 48.329526][ T7200] kcsan_report.cold+0xc/0x10 [ 48.334181][ T7200] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 48.339715][ T7200] __tsan_read4+0x2c/0x30 [ 48.344023][ T7200] tcp_poll+0x1cc/0x6b0 [ 48.348159][ T7200] ? tcp_alloc_md5sig_pool+0x320/0x320 [ 48.353610][ T7200] sock_poll+0xed/0x250 [ 48.357745][ T7200] ? sock_read_iter+0x1e0/0x1e0 [ 48.362576][ T7200] ep_item_poll.isra.0+0x90/0x190 [ 48.367595][ T7200] ep_send_events_proc+0x113/0x590 [ 48.372703][ T7200] ? __schedule+0x319/0x640 [ 48.377192][ T7200] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 48.382814][ T7200] ep_scan_ready_list.constprop.0+0x189/0x500 [ 48.388865][ T7200] ? ep_loop_check_proc+0x2f0/0x2f0 [ 48.394059][ T7200] ep_poll+0xe3/0x900 [ 48.398024][ T7200] ? wake_up_q+0x70/0x70 [ 48.402248][ T7200] do_epoll_wait+0x162/0x180 [ 48.406819][ T7200] __x64_sys_epoll_pwait+0xcd/0x180 [ 48.412013][ T7200] do_syscall_64+0xcc/0x370 [ 48.416508][ T7200] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 48.422375][ T7200] RIP: 0033:0x45b300 [ 48.426263][ T7200] Code: 0f 05 89 44 24 20 c3 cc cc cc 8b 7c 24 08 48 8b 74 24 10 8b 54 24 18 44 8b 54 24 1c 49 c7 c0 00 00 00 00 b8 19 01 00 00 0f 05 <89> 44 24 20 c3 cc cc cc cc cc cc cc cc cc cc cc 8b 7c 24 08 48 c7 [ 48.445928][ T7200] RSP: 002b:000000c420139860 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 48.454316][ T7200] RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 000000000045b300 [ 48.462263][ T7200] RDX: 0000000000000080 RSI: 000000c4201398a0 RDI: 0000000000000004 [ 48.470222][ T7200] RBP: 000000c420139ea0 R08: 0000000000000000 R09: 000000c42006e780 [ 48.478184][ T7200] R10: 00000000ffffffff R11: 0000000000000246 R12: 00000000000000a0 [ 48.486140][ T7200] R13: 00000000000000a7 R14: 00007fb46c367000 R15: 0000000000000004 [ 48.495675][ T7200] Kernel Offset: disabled [ 48.500105][ T7200] Rebooting in 86400 seconds..