[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.649360][ T23] audit: type=1800 audit(1571075607.079:25): pid=7111 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.692423][ T23] audit: type=1800 audit(1571075607.079:26): pid=7111 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.717730][ T23] audit: type=1800 audit(1571075607.079:27): pid=7111 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 '10.128.0.207' (ECDSA) to the list of known hosts. 2019/10/14 17:53:37 fuzzer started 2019/10/14 17:53:38 dialing manager at 10.128.0.105:43961 2019/10/14 17:53:38 syscalls: 2523 2019/10/14 17:53:38 code coverage: enabled 2019/10/14 17:53:38 comparison tracing: enabled 2019/10/14 17:53:38 extra coverage: extra coverage is not supported by the kernel 2019/10/14 17:53:38 setuid sandbox: enabled 2019/10/14 17:53:38 namespace sandbox: enabled 2019/10/14 17:53:38 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/14 17:53:38 fault injection: enabled 2019/10/14 17:53:38 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/14 17:53:38 net packet injection: enabled 2019/10/14 17:53:38 net device setup: enabled 2019/10/14 17:53:38 concurrency sanitizer: enabled syzkaller login: [ 46.905605][ T7270] ================================================================== [ 46.913729][ T7270] BUG: KCSAN: data-race in tcp_poll / tcp_recvmsg [ 46.922822][ T7270] [ 46.925132][ T7270] read to 0xffff888122b117b4 of 4 bytes by task 7266 on cpu 0: [ 46.932829][ T7270] tcp_poll+0x1cc/0x6b0 [ 46.937005][ T7270] sock_poll+0xed/0x250 [ 46.941164][ T7270] ep_item_poll.isra.0+0x90/0x190 [ 46.946289][ T7270] ep_send_events_proc+0x113/0x5c0 [ 46.951400][ T7270] ep_scan_ready_list.constprop.0+0x189/0x500 [ 46.957453][ T7270] ep_poll+0xe3/0x900 [ 46.961429][ T7270] do_epoll_wait+0x162/0x180 [ 46.966006][ T7270] __x64_sys_epoll_pwait+0xcd/0x170 [ 46.971208][ T7270] do_syscall_64+0xcf/0x2f0 [ 46.975715][ T7270] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 46.981597][ T7270] [ 46.983924][ T7270] write to 0xffff888122b117b4 of 4 bytes by task 7270 on cpu 1: [ 46.991534][ T7270] tcp_recvmsg+0xd86/0x1a30 [ 46.996015][ T7270] inet_recvmsg+0xbb/0x250 [ 47.000409][ T7270] sock_recvmsg+0x92/0xb0 [ 47.004734][ T7270] sock_read_iter+0x15f/0x1e0 [ 47.009390][ T7270] new_sync_read+0x389/0x4f0 [ 47.013957][ T7270] __vfs_read+0xb1/0xc0 [ 47.018104][ T7270] vfs_read+0x143/0x2c0 [ 47.022251][ T7270] ksys_read+0xd5/0x1b0 [ 47.026386][ T7270] __x64_sys_read+0x4c/0x60 [ 47.030878][ T7270] do_syscall_64+0xcf/0x2f0 [ 47.035421][ T7270] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 47.041293][ T7270] [ 47.044395][ T7270] Reported by Kernel Concurrency Sanitizer on: [ 47.050530][ T7270] CPU: 1 PID: 7270 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 47.057624][ T7270] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.067863][ T7270] ================================================================== [ 47.076239][ T7270] Kernel panic - not syncing: panic_on_warn set ... [ 47.083288][ T7270] CPU: 1 PID: 7270 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 47.090380][ T7270] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.100557][ T7270] Call Trace: [ 47.103835][ T7270] dump_stack+0xf5/0x159 [ 47.108066][ T7270] panic+0x209/0x639 [ 47.112225][ T7270] ? __x64_sys_read+0x4c/0x60 [ 47.116879][ T7270] ? vprintk_func+0x8d/0x140 [ 47.121475][ T7270] kcsan_report.cold+0xc/0x1b [ 47.126135][ T7270] __kcsan_setup_watchpoint+0x3ee/0x510 [ 47.131683][ T7270] __tsan_write4+0x32/0x40 [ 47.136265][ T7270] tcp_recvmsg+0xd86/0x1a30 [ 47.140783][ T7270] ? __kcsan_setup_watchpoint+0x96/0x510 [ 47.146416][ T7270] inet_recvmsg+0xbb/0x250 [ 47.150812][ T7270] ? __tsan_read8+0x2c/0x30 [ 47.155302][ T7270] ? inet_sendpage+0x100/0x100 [ 47.160048][ T7270] sock_recvmsg+0x92/0xb0 [ 47.164367][ T7270] sock_read_iter+0x15f/0x1e0 [ 47.169040][ T7270] new_sync_read+0x389/0x4f0 [ 47.173625][ T7270] __vfs_read+0xb1/0xc0 [ 47.177782][ T7270] vfs_read+0x143/0x2c0 [ 47.181919][ T7270] ksys_read+0xd5/0x1b0 [ 47.186151][ T7270] __x64_sys_read+0x4c/0x60 [ 47.190689][ T7270] do_syscall_64+0xcf/0x2f0 [ 47.195191][ T7270] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 47.201080][ T7270] RIP: 0033:0x47c530 [ 47.204958][ T7270] 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 [ 47.224547][ T7270] RSP: 002b:000000c4203b1810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 47.233459][ T7270] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 47.241415][ T7270] RDX: 0000000000001000 RSI: 000000c42030a000 RDI: 0000000000000003 [ 47.249379][ T7270] RBP: 000000c4203b1868 R08: 0000000000000000 R09: 0000000000000000 [ 47.257324][ T7270] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000100 [ 47.265274][ T7270] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 47.274667][ T7270] Kernel Offset: disabled [ 47.278995][ T7270] Rebooting in 86400 seconds..