[ 40.940853][ T23] audit: type=1800 audit(1570467198.037:24): pid=7202 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[?25l[?1c7[ ok 8[?25h[?0c. [ 41.480430][ T23] audit: type=1800 audit(1570467198.647:25): pid=7202 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 41.507907][ T23] audit: type=1800 audit(1570467198.647:26): pid=7202 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 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 '10.128.0.126' (ECDSA) to the list of known hosts. 2019/10/07 16:53:30 fuzzer started 2019/10/07 16:53:31 dialing manager at 10.128.0.105:39369 2019/10/07 16:53:31 syscalls: 2523 2019/10/07 16:53:31 code coverage: enabled 2019/10/07 16:53:31 comparison tracing: enabled 2019/10/07 16:53:31 extra coverage: extra coverage is not supported by the kernel 2019/10/07 16:53:31 setuid sandbox: enabled 2019/10/07 16:53:31 namespace sandbox: enabled 2019/10/07 16:53:31 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/07 16:53:31 fault injection: enabled 2019/10/07 16:53:31 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/07 16:53:31 net packet injection: enabled 2019/10/07 16:53:31 net device setup: enabled 2019/10/07 16:53:31 concurrency sanitizer: enabled syzkaller login: [ 54.381291][ T7353] ================================================================== [ 54.389464][ T7353] BUG: KCSAN: data-race in tcp_poll / tcp_recvmsg [ 54.396119][ T7353] [ 54.398458][ T7353] write to 0xffff8881209df774 of 4 bytes by task 7357 on cpu 0: [ 54.406080][ T7353] tcp_recvmsg+0xd86/0x1a30 [ 54.410572][ T7353] inet_recvmsg+0xbb/0x250 [ 54.414979][ T7353] sock_recvmsg+0x92/0xb0 [ 54.419296][ T7353] sock_read_iter+0x15f/0x1e0 [ 54.423965][ T7353] new_sync_read+0x389/0x4f0 [ 54.429062][ T7353] __vfs_read+0xb1/0xc0 [ 54.433206][ T7353] vfs_read+0x143/0x2c0 [ 54.437353][ T7353] ksys_read+0xd5/0x1b0 [ 54.441673][ T7353] __x64_sys_read+0x4c/0x60 [ 54.446169][ T7353] do_syscall_64+0xcf/0x2f0 [ 54.450677][ T7353] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 54.456553][ T7353] [ 54.458887][ T7353] read to 0xffff8881209df774 of 4 bytes by task 7353 on cpu 1: [ 54.466418][ T7353] tcp_poll+0x1cc/0x6b0 [ 54.470563][ T7353] sock_poll+0xed/0x250 [ 54.474729][ T7353] ep_item_poll.isra.0+0x90/0x190 [ 54.479741][ T7353] ep_send_events_proc+0x113/0x5c0 [ 54.484840][ T7353] ep_scan_ready_list.constprop.0+0x189/0x500 [ 54.490894][ T7353] ep_poll+0xe3/0x900 [ 54.494866][ T7353] do_epoll_wait+0x162/0x180 [ 54.499444][ T7353] __x64_sys_epoll_pwait+0xcd/0x170 [ 54.504632][ T7353] do_syscall_64+0xcf/0x2f0 [ 54.509314][ T7353] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 54.515188][ T7353] [ 54.517503][ T7353] Reported by Kernel Concurrency Sanitizer on: [ 54.524081][ T7353] CPU: 1 PID: 7353 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 54.531259][ T7353] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.541310][ T7353] ================================================================== [ 54.549368][ T7353] Kernel panic - not syncing: panic_on_warn set ... [ 54.555965][ T7353] CPU: 1 PID: 7353 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 54.563064][ T7353] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.573103][ T7353] Call Trace: [ 54.576387][ T7353] dump_stack+0xf5/0x159 [ 54.580626][ T7353] panic+0x209/0x639 [ 54.584517][ T7353] ? vprintk_func+0x8d/0x140 [ 54.589450][ T7353] kcsan_report.cold+0x57/0xeb [ 54.594905][ T7353] __kcsan_setup_watchpoint+0x342/0x500 [ 54.600454][ T7353] __tsan_read4+0x2c/0x30 [ 54.605146][ T7353] tcp_poll+0x1cc/0x6b0 [ 54.609392][ T7353] ? tcp_alloc_md5sig_pool+0x320/0x320 [ 54.614855][ T7353] sock_poll+0xed/0x250 [ 54.618999][ T7353] ? sock_read_iter+0x1e0/0x1e0 [ 54.623842][ T7353] ep_item_poll.isra.0+0x90/0x190 [ 54.628874][ T7353] ep_send_events_proc+0x113/0x5c0 [ 54.633984][ T7353] ep_scan_ready_list.constprop.0+0x189/0x500 [ 54.640256][ T7353] ? ep_loop_check_proc+0x2f0/0x2f0 [ 54.645447][ T7353] ep_poll+0xe3/0x900 [ 54.649442][ T7353] ? __fget+0xb8/0x1d0 [ 54.653593][ T7353] ? __fget_light+0xaf/0x190 [ 54.658179][ T7353] do_epoll_wait+0x162/0x180 [ 54.662763][ T7353] __x64_sys_epoll_pwait+0xcd/0x170 [ 54.667973][ T7353] do_syscall_64+0xcf/0x2f0 [ 54.672493][ T7353] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 54.678459][ T7353] RIP: 0033:0x45b300 [ 54.682349][ T7353] 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 [ 54.702101][ T7353] RSP: 002b:000000c42004f8d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 54.710514][ T7353] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045b300 [ 54.718474][ T7353] RDX: 0000000000000080 RSI: 000000c42004f918 RDI: 0000000000000004 [ 54.726434][ T7353] RBP: 000000c42004ff18 R08: 0000000000000000 R09: 0000000000002682 [ 54.734480][ T7353] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000042f0a0 [ 54.742629][ T7353] R13: 00000000000000f1 R14: 0000000000000011 R15: 0000000000000000 [ 54.752342][ T7353] Kernel Offset: disabled [ 54.757542][ T7353] Rebooting in 86400 seconds..