[ 45.428705][ T23] audit: type=1800 audit(1570292795.094:21): pid=7138 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 45.477540][ T23] audit: type=1800 audit(1570292795.094:22): pid=7138 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0 [ 45.498613][ T23] audit: type=1800 audit(1570292795.104:23): pid=7138 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rsyslog" dev="sda1" ino=2475 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] 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 '10.128.0.254' (ECDSA) to the list of known hosts. 2019/10/05 16:26:46 fuzzer started 2019/10/05 16:26:47 dialing manager at 10.128.0.105:35709 2019/10/05 16:26:47 syscalls: 2523 2019/10/05 16:26:47 code coverage: enabled 2019/10/05 16:26:47 comparison tracing: enabled 2019/10/05 16:26:47 extra coverage: extra coverage is not supported by the kernel 2019/10/05 16:26:47 setuid sandbox: enabled 2019/10/05 16:26:47 namespace sandbox: enabled 2019/10/05 16:26:47 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/05 16:26:47 fault injection: enabled 2019/10/05 16:26:47 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/05 16:26:47 net packet injection: enabled 2019/10/05 16:26:47 net device setup: enabled 2019/10/05 16:26:47 concurrency sanitizer: enabled syzkaller login: [ 57.917952][ T7291] ================================================================== [ 57.926836][ T7291] BUG: KCSAN: data-race in tcp_poll / tcp_recvmsg [ 57.933240][ T7291] [ 57.935559][ T7291] write to 0xffff888126fbe5b4 of 4 bytes by task 7295 on cpu 0: [ 57.943175][ T7291] tcp_recvmsg+0xd86/0x1a30 [ 57.947666][ T7291] inet_recvmsg+0xbb/0x250 [ 57.952072][ T7291] sock_recvmsg+0x92/0xb0 [ 57.956395][ T7291] sock_read_iter+0x15f/0x1e0 [ 57.961070][ T7291] new_sync_read+0x389/0x4f0 [ 57.965778][ T7291] __vfs_read+0xb1/0xc0 [ 57.969938][ T7291] vfs_read+0x143/0x2c0 [ 57.974069][ T7291] ksys_read+0xd5/0x1b0 [ 57.978199][ T7291] __x64_sys_read+0x4c/0x60 [ 57.982711][ T7291] do_syscall_64+0xcf/0x2f0 [ 57.987208][ T7291] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 57.993074][ T7291] [ 57.995393][ T7291] read to 0xffff888126fbe5b4 of 4 bytes by task 7291 on cpu 1: [ 58.002923][ T7291] tcp_poll+0x1cc/0x6b0 [ 58.007242][ T7291] sock_poll+0xed/0x250 [ 58.011378][ T7291] ep_item_poll.isra.0+0x90/0x190 [ 58.016387][ T7291] ep_send_events_proc+0x113/0x5c0 [ 58.021484][ T7291] ep_scan_ready_list.constprop.0+0x189/0x500 [ 58.027525][ T7291] ep_poll+0xe3/0x900 [ 58.031493][ T7291] do_epoll_wait+0x162/0x180 [ 58.036147][ T7291] __x64_sys_epoll_pwait+0xcd/0x170 [ 58.041326][ T7291] do_syscall_64+0xcf/0x2f0 [ 58.045810][ T7291] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 58.051781][ T7291] [ 58.054090][ T7291] Reported by Kernel Concurrency Sanitizer on: [ 58.060265][ T7291] CPU: 1 PID: 7291 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 58.067370][ T7291] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.077489][ T7291] ================================================================== [ 58.085526][ T7291] Kernel panic - not syncing: panic_on_warn set ... [ 58.092091][ T7291] CPU: 1 PID: 7291 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 58.099170][ T7291] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.109471][ T7291] Call Trace: [ 58.112756][ T7291] dump_stack+0xf5/0x159 [ 58.116982][ T7291] panic+0x209/0x639 [ 58.120868][ T7291] ? vprintk_func+0x8d/0x140 [ 58.125452][ T7291] kcsan_report.cold+0x57/0xeb [ 58.130195][ T7291] __kcsan_setup_watchpoint+0x342/0x500 [ 58.135727][ T7291] __tsan_read4+0x2c/0x30 [ 58.140053][ T7291] tcp_poll+0x1cc/0x6b0 [ 58.144311][ T7291] ? tcp_alloc_md5sig_pool+0x320/0x320 [ 58.149759][ T7291] sock_poll+0xed/0x250 [ 58.153898][ T7291] ? sock_read_iter+0x1e0/0x1e0 [ 58.158728][ T7291] ep_item_poll.isra.0+0x90/0x190 [ 58.163735][ T7291] ep_send_events_proc+0x113/0x5c0 [ 58.169185][ T7291] ep_scan_ready_list.constprop.0+0x189/0x500 [ 58.175246][ T7291] ? ep_loop_check_proc+0x2f0/0x2f0 [ 58.180423][ T7291] ep_poll+0xe3/0x900 [ 58.184386][ T7291] ? __fget+0xb8/0x1d0 [ 58.188437][ T7291] ? __fget_light+0xaf/0x190 [ 58.193018][ T7291] do_epoll_wait+0x162/0x180 [ 58.197728][ T7291] __x64_sys_epoll_pwait+0xcd/0x170 [ 58.202909][ T7291] do_syscall_64+0xcf/0x2f0 [ 58.207515][ T7291] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 58.213404][ T7291] RIP: 0033:0x45b300 [ 58.217299][ T7291] 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 [ 58.236891][ T7291] RSP: 002b:000000c42004f8d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 58.245278][ T7291] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045b300 [ 58.253266][ T7291] RDX: 0000000000000080 RSI: 000000c42004f918 RDI: 0000000000000004 [ 58.261218][ T7291] RBP: 000000c42004ff18 R08: 0000000000000000 R09: 0000000000002934 [ 58.269183][ T7291] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000042f0a0 [ 58.277140][ T7291] R13: 00000000000000f1 R14: 0000000000000011 R15: 0000000000000000 [ 58.286606][ T7291] Kernel Offset: disabled [ 58.290931][ T7291] Rebooting in 86400 seconds..