[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.692037][ T26] audit: type=1800 audit(1570624727.146:25): 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 [ 35.728918][ T26] audit: type=1800 audit(1570624727.146:26): 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 [ 35.749334][ T26] audit: type=1800 audit(1570624727.146:27): 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 '10.128.0.129' (ECDSA) to the list of known hosts. 2019/10/09 12:38:57 fuzzer started 2019/10/09 12:38:59 dialing manager at 10.128.0.105:43333 2019/10/09 12:38:59 syscalls: 2523 2019/10/09 12:38:59 code coverage: enabled 2019/10/09 12:38:59 comparison tracing: enabled 2019/10/09 12:38:59 extra coverage: extra coverage is not supported by the kernel 2019/10/09 12:38:59 setuid sandbox: enabled 2019/10/09 12:38:59 namespace sandbox: enabled 2019/10/09 12:38:59 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/09 12:38:59 fault injection: enabled 2019/10/09 12:38:59 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/09 12:38:59 net packet injection: enabled 2019/10/09 12:38:59 net device setup: enabled 2019/10/09 12:38:59 concurrency sanitizer: enabled syzkaller login: [ 47.909990][ T7262] ================================================================== [ 47.918239][ T7262] BUG: KCSAN: data-race in tcp_poll / tcp_recvmsg [ 47.924813][ T7262] [ 47.927138][ T7262] read to 0xffff888123b5e5b4 of 4 bytes by task 7260 on cpu 1: [ 47.934674][ T7262] tcp_poll+0x1cc/0x6b0 [ 47.939244][ T7262] sock_poll+0xed/0x250 [ 47.943377][ T7262] ep_item_poll.isra.0+0x90/0x190 [ 47.948378][ T7262] ep_send_events_proc+0x113/0x5c0 [ 47.953465][ T7262] ep_scan_ready_list.constprop.0+0x189/0x500 [ 47.959519][ T7262] ep_poll+0xe3/0x900 [ 47.963476][ T7262] do_epoll_wait+0x162/0x180 [ 47.968046][ T7262] __x64_sys_epoll_pwait+0xcd/0x170 [ 47.973225][ T7262] do_syscall_64+0xcf/0x2f0 [ 47.977706][ T7262] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 47.983601][ T7262] [ 47.985907][ T7262] write to 0xffff888123b5e5b4 of 4 bytes by task 7262 on cpu 0: [ 47.993510][ T7262] tcp_recvmsg+0xd86/0x1a30 [ 47.997996][ T7262] inet_recvmsg+0xbb/0x250 [ 48.002397][ T7262] sock_recvmsg+0x92/0xb0 [ 48.006718][ T7262] sock_read_iter+0x15f/0x1e0 [ 48.011382][ T7262] new_sync_read+0x389/0x4f0 [ 48.016031][ T7262] __vfs_read+0xb1/0xc0 [ 48.020179][ T7262] vfs_read+0x143/0x2c0 [ 48.024318][ T7262] ksys_read+0xd5/0x1b0 [ 48.028448][ T7262] __x64_sys_read+0x4c/0x60 [ 48.033359][ T7262] do_syscall_64+0xcf/0x2f0 [ 48.038362][ T7262] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 48.044221][ T7262] [ 48.046530][ T7262] Reported by Kernel Concurrency Sanitizer on: [ 48.053624][ T7262] CPU: 0 PID: 7262 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 48.060799][ T7262] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.070834][ T7262] ================================================================== [ 48.078891][ T7262] Kernel panic - not syncing: panic_on_warn set ... [ 48.085458][ T7262] CPU: 0 PID: 7262 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 48.092539][ T7262] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.102567][ T7262] Call Trace: [ 48.105837][ T7262] dump_stack+0xf5/0x159 [ 48.110056][ T7262] panic+0x209/0x639 [ 48.113931][ T7262] ? __x64_sys_read+0x4c/0x60 [ 48.118597][ T7262] ? vprintk_func+0x8d/0x140 [ 48.123255][ T7262] kcsan_report.cold+0xc/0x1b [ 48.127909][ T7262] __kcsan_setup_watchpoint+0x3ee/0x510 [ 48.133452][ T7262] __tsan_write4+0x32/0x40 [ 48.137847][ T7262] tcp_recvmsg+0xd86/0x1a30 [ 48.142333][ T7262] ? __kcsan_setup_watchpoint+0x96/0x510 [ 48.147956][ T7262] inet_recvmsg+0xbb/0x250 [ 48.152347][ T7262] ? __tsan_read8+0x2c/0x30 [ 48.156829][ T7262] ? inet_sendpage+0x100/0x100 [ 48.161829][ T7262] sock_recvmsg+0x92/0xb0 [ 48.166138][ T7262] sock_read_iter+0x15f/0x1e0 [ 48.170798][ T7262] new_sync_read+0x389/0x4f0 [ 48.175396][ T7262] __vfs_read+0xb1/0xc0 [ 48.179764][ T7262] vfs_read+0x143/0x2c0 [ 48.184082][ T7262] ksys_read+0xd5/0x1b0 [ 48.188251][ T7262] __x64_sys_read+0x4c/0x60 [ 48.192753][ T7262] do_syscall_64+0xcf/0x2f0 [ 48.197255][ T7262] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 48.203141][ T7262] RIP: 0033:0x47c530 [ 48.207019][ T7262] 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 [ 48.226637][ T7262] RSP: 002b:000000c4201b47d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 48.235105][ T7262] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 48.243225][ T7262] RDX: 0000000000001000 RSI: 000000c4200d4000 RDI: 0000000000000003 [ 48.251370][ T7262] RBP: 000000c4201b4830 R08: 0000000000000000 R09: 0000000000000000 [ 48.259333][ T7262] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000008 [ 48.267285][ T7262] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 48.276795][ T7262] Kernel Offset: disabled [ 48.281140][ T7262] Rebooting in 86400 seconds..