[ 34.001066][ T23] audit: type=1800 audit(1571202303.235:23): pid=7005 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rsyslog" dev="sda1" ino=2475 res=0 [ 34.025217][ T23] audit: type=1800 audit(1571202303.245:24): pid=7005 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[ 34.262217][ T7030] rsyslogd (7030) used greatest stack depth: 10152 bytes left [?25l[?1c7[ ok 8[?25h[?0c. [ 34.359162][ T23] audit: type=1800 audit(1571202303.655:25): pid=7005 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.379332][ T23] audit: type=1800 audit(1571202303.655:26): pid=7005 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.408779][ T23] audit: type=1800 audit(1571202303.655:27): pid=7005 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. [ 34.694019][ T7068] sshd (7068) 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 '10.128.0.89' (ECDSA) to the list of known hosts. 2019/10/16 05:05:10 fuzzer started 2019/10/16 05:05:11 dialing manager at 10.128.0.105:34737 2019/10/16 05:05:11 syscalls: 2524 2019/10/16 05:05:11 code coverage: enabled 2019/10/16 05:05:11 comparison tracing: enabled 2019/10/16 05:05:11 extra coverage: extra coverage is not supported by the kernel 2019/10/16 05:05:11 setuid sandbox: enabled 2019/10/16 05:05:11 namespace sandbox: enabled 2019/10/16 05:05:11 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/16 05:05:11 fault injection: enabled 2019/10/16 05:05:11 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/16 05:05:11 net packet injection: enabled 2019/10/16 05:05:11 net device setup: enabled 2019/10/16 05:05:11 concurrency sanitizer: enabled syzkaller login: [ 42.814216][ T7154] ================================================================== [ 42.822369][ T7154] BUG: KCSAN: data-race in tcp_poll / tcp_recvmsg [ 42.828777][ T7154] [ 42.831116][ T7154] write to 0xffff888122140ebc of 4 bytes by task 7158 on cpu 0: [ 42.838744][ T7154] tcp_recvmsg+0xd86/0x1a30 [ 42.843236][ T7154] inet_recvmsg+0xbb/0x250 [ 42.847637][ T7154] sock_recvmsg+0x92/0xb0 [ 42.851970][ T7154] sock_read_iter+0x15f/0x1e0 [ 42.856633][ T7154] new_sync_read+0x389/0x4f0 [ 42.861211][ T7154] __vfs_read+0xb1/0xc0 [ 42.865352][ T7154] vfs_read+0x143/0x2c0 [ 42.869494][ T7154] ksys_read+0xd5/0x1b0 [ 42.873652][ T7154] __x64_sys_read+0x4c/0x60 [ 42.878144][ T7154] do_syscall_64+0xcc/0x370 [ 42.882635][ T7154] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 42.888518][ T7154] [ 42.890836][ T7154] read to 0xffff888122140ebc of 4 bytes by task 7154 on cpu 1: [ 42.898369][ T7154] tcp_poll+0x1cc/0x6b0 [ 42.902514][ T7154] sock_poll+0xed/0x250 [ 42.906656][ T7154] ep_item_poll.isra.0+0x90/0x190 [ 42.911682][ T7154] ep_send_events_proc+0x113/0x590 [ 42.916786][ T7154] ep_scan_ready_list.constprop.0+0x189/0x500 [ 42.922848][ T7154] ep_poll+0xe3/0x900 [ 42.926819][ T7154] do_epoll_wait+0x162/0x180 [ 42.931395][ T7154] __x64_sys_epoll_pwait+0xcd/0x180 [ 42.936600][ T7154] do_syscall_64+0xcc/0x370 [ 42.941107][ T7154] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 42.946988][ T7154] [ 42.949299][ T7154] Reported by Kernel Concurrency Sanitizer on: [ 42.955455][ T7154] CPU: 1 PID: 7154 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 42.962905][ T7154] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.972953][ T7154] ================================================================== [ 42.981004][ T7154] Kernel panic - not syncing: panic_on_warn set ... [ 42.987582][ T7154] CPU: 1 PID: 7154 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 42.995021][ T7154] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.005064][ T7154] Call Trace: [ 43.008348][ T7154] dump_stack+0xf5/0x159 [ 43.012582][ T7154] panic+0x210/0x640 [ 43.016494][ T7154] ? do_syscall_64+0xcc/0x370 [ 43.021184][ T7154] ? vprintk_func+0x8d/0x140 [ 43.025767][ T7154] kcsan_report.cold+0xc/0x1b [ 43.030436][ T7154] __kcsan_setup_watchpoint+0x3ee/0x510 [ 43.035972][ T7154] __tsan_read4+0x2c/0x30 [ 43.040297][ T7154] tcp_poll+0x1cc/0x6b0 [ 43.044442][ T7154] ? tcp_alloc_md5sig_pool+0x320/0x320 [ 43.049910][ T7154] sock_poll+0xed/0x250 [ 43.054057][ T7154] ? sock_read_iter+0x1e0/0x1e0 [ 43.058899][ T7154] ep_item_poll.isra.0+0x90/0x190 [ 43.063916][ T7154] ep_send_events_proc+0x113/0x590 [ 43.069015][ T7154] ? __kcsan_setup_watchpoint+0x96/0x510 [ 43.074643][ T7154] ep_scan_ready_list.constprop.0+0x189/0x500 [ 43.080700][ T7154] ? ep_loop_check_proc+0x2f0/0x2f0 [ 43.085890][ T7154] ep_poll+0xe3/0x900 [ 43.089864][ T7154] ? __fget+0xb8/0x1d0 [ 43.093955][ T7154] ? __kcsan_setup_watchpoint+0x96/0x510 [ 43.099575][ T7154] ? __fget_light+0xaf/0x190 [ 43.104161][ T7154] do_epoll_wait+0x162/0x180 [ 43.108763][ T7154] __x64_sys_epoll_pwait+0xcd/0x180 [ 43.114072][ T7154] do_syscall_64+0xcc/0x370 [ 43.118576][ T7154] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 43.124461][ T7154] RIP: 0033:0x45b300 [ 43.128351][ T7154] 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 [ 43.147955][ T7154] RSP: 002b:000000c42004f8d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 43.156375][ T7154] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045b300 [ 43.164352][ T7154] RDX: 0000000000000080 RSI: 000000c42004f918 RDI: 0000000000000004 [ 43.172308][ T7154] RBP: 000000c42004ff18 R08: 0000000000000000 R09: 0000000000001ef0 [ 43.180280][ T7154] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000042f0a0 [ 43.188238][ T7154] R13: 00000000000000f1 R14: 0000000000000011 R15: 0000000000000000 [ 43.197616][ T7154] Kernel Offset: disabled [ 43.201967][ T7154] Rebooting in 86400 seconds..