[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.265380][ T25] audit: type=1800 audit(1570523807.275:25): pid=7107 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.285133][ T25] audit: type=1800 audit(1570523807.275:26): pid=7107 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.306988][ T25] audit: type=1800 audit(1570523807.275:27): pid=7107 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 '10.128.0.98' (ECDSA) to the list of known hosts. 2019/10/08 08:37:01 fuzzer started 2019/10/08 08:37:02 dialing manager at 10.128.0.105:39369 2019/10/08 08:37:02 syscalls: 2523 2019/10/08 08:37:02 code coverage: enabled 2019/10/08 08:37:02 comparison tracing: enabled 2019/10/08 08:37:02 extra coverage: extra coverage is not supported by the kernel 2019/10/08 08:37:02 setuid sandbox: enabled 2019/10/08 08:37:02 namespace sandbox: enabled 2019/10/08 08:37:02 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/08 08:37:02 fault injection: enabled 2019/10/08 08:37:02 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/08 08:37:02 net packet injection: enabled 2019/10/08 08:37:02 net device setup: enabled 2019/10/08 08:37:02 concurrency sanitizer: enabled syzkaller login: [ 49.605051][ T7265] ================================================================== [ 49.613247][ T7265] BUG: KCSAN: data-race in tcp_poll / tcp_recvmsg [ 49.620085][ T7265] [ 49.622409][ T7265] read to 0xffff88812aacd7b4 of 4 bytes by task 7276 on cpu 0: [ 49.629947][ T7265] tcp_poll+0x1cc/0x6b0 [ 49.634096][ T7265] sock_poll+0xed/0x250 [ 49.638245][ T7265] ep_item_poll.isra.0+0x90/0x190 [ 49.643298][ T7265] ep_send_events_proc+0x113/0x5c0 [ 49.648399][ T7265] ep_scan_ready_list.constprop.0+0x189/0x500 [ 49.654502][ T7265] ep_poll+0xe3/0x900 [ 49.658470][ T7265] do_epoll_wait+0x162/0x180 [ 49.663086][ T7265] __x64_sys_epoll_pwait+0xcd/0x170 [ 49.668277][ T7265] do_syscall_64+0xcf/0x2f0 [ 49.672778][ T7265] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.678650][ T7265] [ 49.680965][ T7265] write to 0xffff88812aacd7b4 of 4 bytes by task 7265 on cpu 1: [ 49.688580][ T7265] tcp_recvmsg+0xd86/0x1a30 [ 49.693065][ T7265] inet_recvmsg+0xbb/0x250 [ 49.697465][ T7265] sock_recvmsg+0x92/0xb0 [ 49.701775][ T7265] sock_read_iter+0x15f/0x1e0 [ 49.706449][ T7265] new_sync_read+0x389/0x4f0 [ 49.711019][ T7265] __vfs_read+0xb1/0xc0 [ 49.715149][ T7265] vfs_read+0x143/0x2c0 [ 49.719287][ T7265] ksys_read+0xd5/0x1b0 [ 49.723430][ T7265] __x64_sys_read+0x4c/0x60 [ 49.727918][ T7265] do_syscall_64+0xcf/0x2f0 [ 49.732423][ T7265] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.738292][ T7265] [ 49.740603][ T7265] Reported by Kernel Concurrency Sanitizer on: [ 49.746736][ T7265] CPU: 1 PID: 7265 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 49.753822][ T7265] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.763855][ T7265] ================================================================== [ 49.771905][ T7265] Kernel panic - not syncing: panic_on_warn set ... [ 49.778484][ T7265] CPU: 1 PID: 7265 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 49.785572][ T7265] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.795610][ T7265] Call Trace: [ 49.798887][ T7265] dump_stack+0xf5/0x159 [ 49.803139][ T7265] panic+0x209/0x639 [ 49.807042][ T7265] ? vprintk_func+0x8d/0x140 [ 49.811628][ T7265] kcsan_report.cold+0x57/0xeb [ 49.816384][ T7265] __kcsan_setup_watchpoint+0x342/0x500 [ 49.821926][ T7265] __tsan_write4+0x32/0x40 [ 49.826333][ T7265] tcp_recvmsg+0xd86/0x1a30 [ 49.830859][ T7265] inet_recvmsg+0xbb/0x250 [ 49.835258][ T7265] ? __tsan_read8+0x2c/0x30 [ 49.839752][ T7265] ? inet_sendpage+0x100/0x100 [ 49.844507][ T7265] sock_recvmsg+0x92/0xb0 [ 49.848815][ T7265] sock_read_iter+0x15f/0x1e0 [ 49.853516][ T7265] new_sync_read+0x389/0x4f0 [ 49.858103][ T7265] __vfs_read+0xb1/0xc0 [ 49.862257][ T7265] vfs_read+0x143/0x2c0 [ 49.866419][ T7265] ksys_read+0xd5/0x1b0 [ 49.870572][ T7265] __x64_sys_read+0x4c/0x60 [ 49.875055][ T7265] do_syscall_64+0xcf/0x2f0 [ 49.879552][ T7265] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.885430][ T7265] RIP: 0033:0x47c530 [ 49.889313][ T7265] 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 [ 49.908915][ T7265] RSP: 002b:000000c4203cb810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 49.917307][ T7265] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 49.925261][ T7265] RDX: 0000000000001000 RSI: 000000c4202d2000 RDI: 0000000000000003 [ 49.933211][ T7265] RBP: 000000c4203cb868 R08: 0000000000000000 R09: 0000000000000000 [ 49.941159][ T7265] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000040 [ 49.949112][ T7265] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 49.958401][ T7265] Kernel Offset: disabled [ 49.962724][ T7265] Rebooting in 86400 seconds..