[info] Using makefile-style concurrent boot in runlevel 2. [ 46.382483][ T26] audit: type=1800 audit(1570769250.537:21): pid=7243 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 46.425307][ T26] audit: type=1800 audit(1570769250.547:22): pid=7243 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 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 '10.128.10.30' (ECDSA) to the list of known hosts. 2019/10/11 04:47:41 fuzzer started 2019/10/11 04:47:43 dialing manager at 10.128.0.105:37331 2019/10/11 04:47:43 syscalls: 2523 2019/10/11 04:47:43 code coverage: enabled 2019/10/11 04:47:43 comparison tracing: enabled 2019/10/11 04:47:43 extra coverage: extra coverage is not supported by the kernel 2019/10/11 04:47:43 setuid sandbox: enabled 2019/10/11 04:47:43 namespace sandbox: enabled 2019/10/11 04:47:43 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/11 04:47:43 fault injection: enabled 2019/10/11 04:47:43 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/11 04:47:43 net packet injection: enabled 2019/10/11 04:47:43 net device setup: enabled 2019/10/11 04:47:43 concurrency sanitizer: enabled syzkaller login: [ 59.152586][ T7391] ================================================================== [ 59.161114][ T7391] BUG: KCSAN: data-race in tcp_poll / tcp_recvmsg [ 59.168391][ T7391] [ 59.170881][ T7391] write to 0xffff888124dcf774 of 4 bytes by task 7394 on cpu 1: [ 59.178954][ T7391] tcp_recvmsg+0xd86/0x1a30 [ 59.183860][ T7391] inet_recvmsg+0xbb/0x250 [ 59.188298][ T7391] sock_recvmsg+0x92/0xb0 [ 59.193062][ T7391] sock_read_iter+0x15f/0x1e0 [ 59.197976][ T7391] new_sync_read+0x389/0x4f0 [ 59.202847][ T7391] __vfs_read+0xb1/0xc0 [ 59.207018][ T7391] vfs_read+0x143/0x2c0 [ 59.211647][ T7391] ksys_read+0xd5/0x1b0 [ 59.216434][ T7391] __x64_sys_read+0x4c/0x60 [ 59.221286][ T7391] do_syscall_64+0xcf/0x2f0 [ 59.226120][ T7391] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 59.232811][ T7391] [ 59.235242][ T7391] read to 0xffff888124dcf774 of 4 bytes by task 7391 on cpu 0: [ 59.243162][ T7391] tcp_poll+0x1cc/0x6b0 [ 59.247324][ T7391] sock_poll+0xed/0x250 [ 59.251597][ T7391] ep_item_poll.isra.0+0x90/0x190 [ 59.256623][ T7391] ep_send_events_proc+0x113/0x5c0 [ 59.261841][ T7391] ep_scan_ready_list.constprop.0+0x189/0x500 [ 59.267925][ T7391] ep_poll+0xe3/0x900 [ 59.271907][ T7391] do_epoll_wait+0x162/0x180 [ 59.276806][ T7391] __x64_sys_epoll_pwait+0xcd/0x170 [ 59.282022][ T7391] do_syscall_64+0xcf/0x2f0 [ 59.286526][ T7391] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 59.292394][ T7391] [ 59.294707][ T7391] Reported by Kernel Concurrency Sanitizer on: [ 59.300974][ T7391] CPU: 0 PID: 7391 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 59.308157][ T7391] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.318201][ T7391] ================================================================== [ 59.326618][ T7391] Kernel panic - not syncing: panic_on_warn set ... [ 59.333340][ T7391] CPU: 0 PID: 7391 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 59.340641][ T7391] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.350693][ T7391] Call Trace: [ 59.353993][ T7391] dump_stack+0xf5/0x159 [ 59.358400][ T7391] panic+0x209/0x639 [ 59.362318][ T7391] ? do_syscall_64+0xcf/0x2f0 [ 59.367139][ T7391] ? vprintk_func+0x8d/0x140 [ 59.371741][ T7391] kcsan_report.cold+0xc/0x1b [ 59.376423][ T7391] __kcsan_setup_watchpoint+0x3ee/0x510 [ 59.382070][ T7391] __tsan_read4+0x2c/0x30 [ 59.386418][ T7391] tcp_poll+0x1cc/0x6b0 [ 59.390599][ T7391] ? tcp_alloc_md5sig_pool+0x320/0x320 [ 59.396054][ T7391] sock_poll+0xed/0x250 [ 59.400292][ T7391] ? sock_read_iter+0x1e0/0x1e0 [ 59.405294][ T7391] ep_item_poll.isra.0+0x90/0x190 [ 59.410342][ T7391] ep_send_events_proc+0x113/0x5c0 [ 59.415483][ T7391] ? hrtimer_active+0x1a0/0x1a0 [ 59.420427][ T7391] ? __kcsan_setup_watchpoint+0x96/0x510 [ 59.426203][ T7391] ep_scan_ready_list.constprop.0+0x189/0x500 [ 59.432298][ T7391] ? ep_loop_check_proc+0x2f0/0x2f0 [ 59.437620][ T7391] ep_poll+0xe3/0x900 [ 59.441621][ T7391] ? __fget+0xb8/0x1d0 [ 59.445699][ T7391] ? __kcsan_setup_watchpoint+0x96/0x510 [ 59.451351][ T7391] ? __fget_light+0xaf/0x190 [ 59.455952][ T7391] do_epoll_wait+0x162/0x180 [ 59.460548][ T7391] __x64_sys_epoll_pwait+0xcd/0x170 [ 59.465944][ T7391] do_syscall_64+0xcf/0x2f0 [ 59.470645][ T7391] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 59.476674][ T7391] RIP: 0033:0x45b300 [ 59.480575][ T7391] 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 [ 59.500516][ T7391] RSP: 002b:00007fffff288620 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 59.508929][ T7391] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045b300 [ 59.517327][ T7391] RDX: 0000000000000080 RSI: 00007fffff288660 RDI: 0000000000000004 [ 59.525376][ T7391] RBP: 00007fffff288c60 R08: 0000000000000000 R09: 0000000000002a50 [ 59.533392][ T7391] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000040 [ 59.541454][ T7391] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 59.551958][ T7391] Kernel Offset: disabled [ 59.556397][ T7391] Rebooting in 86400 seconds..