[ 41.666386][ T25] audit: type=1800 audit(1571263034.669:23): pid=7044 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rsyslog" dev="sda1" ino=2475 res=0 [ 41.696505][ T25] audit: type=1800 audit(1571263034.669:24): pid=7044 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. [ 42.089245][ T25] audit: type=1800 audit(1571263035.129:25): pid=7044 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 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 '10.128.0.154' (ECDSA) to the list of known hosts. 2019/10/16 21:57:26 fuzzer started 2019/10/16 21:57:27 dialing manager at 10.128.0.105:33899 2019/10/16 21:57:27 syscalls: 2524 2019/10/16 21:57:27 code coverage: enabled 2019/10/16 21:57:27 comparison tracing: enabled 2019/10/16 21:57:27 extra coverage: extra coverage is not supported by the kernel 2019/10/16 21:57:27 setuid sandbox: enabled 2019/10/16 21:57:27 namespace sandbox: enabled 2019/10/16 21:57:27 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/16 21:57:27 fault injection: enabled 2019/10/16 21:57:27 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/16 21:57:27 net packet injection: enabled 2019/10/16 21:57:27 net device setup: enabled 2019/10/16 21:57:27 concurrency sanitizer: enabled syzkaller login: [ 54.824225][ T7207] ================================================================== [ 54.832461][ T7207] BUG: KCSAN: data-race in tcp_poll / tcp_recvmsg [ 54.838979][ T7207] [ 54.841312][ T7207] read to 0xffff8881293e0e7c of 4 bytes by task 7193 on cpu 0: [ 54.848879][ T7207] tcp_poll+0x1cc/0x6b0 [ 54.853036][ T7207] sock_poll+0xed/0x250 [ 54.857167][ T7207] ep_item_poll.isra.0+0x90/0x190 [ 54.862168][ T7207] ep_send_events_proc+0x113/0x590 [ 54.867380][ T7207] ep_scan_ready_list.constprop.0+0x189/0x500 [ 54.873426][ T7207] ep_poll+0xe3/0x900 [ 54.877384][ T7207] do_epoll_wait+0x162/0x180 [ 54.881953][ T7207] __x64_sys_epoll_pwait+0xcd/0x180 [ 54.887177][ T7207] do_syscall_64+0xcc/0x370 [ 54.891656][ T7207] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 54.897643][ T7207] [ 54.899954][ T7207] write to 0xffff8881293e0e7c of 4 bytes by task 7207 on cpu 1: [ 54.907569][ T7207] tcp_recvmsg+0xd86/0x1a30 [ 54.912057][ T7207] inet_recvmsg+0xbb/0x250 [ 54.916459][ T7207] sock_recvmsg+0x92/0xb0 [ 54.920777][ T7207] sock_read_iter+0x15f/0x1e0 [ 54.925428][ T7207] new_sync_read+0x389/0x4f0 [ 54.930028][ T7207] __vfs_read+0xb1/0xc0 [ 54.934161][ T7207] vfs_read+0x143/0x2c0 [ 54.938306][ T7207] ksys_read+0xd5/0x1b0 [ 54.942444][ T7207] __x64_sys_read+0x4c/0x60 [ 54.946938][ T7207] do_syscall_64+0xcc/0x370 [ 54.951420][ T7207] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 54.957283][ T7207] [ 54.959585][ T7207] Reported by Kernel Concurrency Sanitizer on: [ 54.965724][ T7207] CPU: 1 PID: 7207 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 54.973149][ T7207] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.983178][ T7207] ================================================================== [ 54.991211][ T7207] Kernel panic - not syncing: panic_on_warn set ... [ 54.997772][ T7207] CPU: 1 PID: 7207 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 55.005206][ T7207] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.015231][ T7207] Call Trace: [ 55.018501][ T7207] dump_stack+0xf5/0x159 [ 55.022718][ T7207] panic+0x210/0x640 [ 55.026589][ T7207] ? __x64_sys_read+0x4c/0x60 [ 55.031254][ T7207] ? vprintk_func+0x8d/0x140 [ 55.035848][ T7207] kcsan_report.cold+0xc/0x1b [ 55.040504][ T7207] __kcsan_setup_watchpoint+0x3ee/0x510 [ 55.046028][ T7207] __tsan_write4+0x32/0x40 [ 55.050441][ T7207] tcp_recvmsg+0xd86/0x1a30 [ 55.055093][ T7207] ? __kcsan_setup_watchpoint+0x96/0x510 [ 55.060715][ T7207] inet_recvmsg+0xbb/0x250 [ 55.065166][ T7207] ? __tsan_read8+0x2c/0x30 [ 55.069662][ T7207] ? inet_sendpage+0x100/0x100 [ 55.074418][ T7207] sock_recvmsg+0x92/0xb0 [ 55.078728][ T7207] sock_read_iter+0x15f/0x1e0 [ 55.083398][ T7207] new_sync_read+0x389/0x4f0 [ 55.087975][ T7207] __vfs_read+0xb1/0xc0 [ 55.092111][ T7207] vfs_read+0x143/0x2c0 [ 55.096250][ T7207] ksys_read+0xd5/0x1b0 [ 55.100472][ T7207] __x64_sys_read+0x4c/0x60 [ 55.104965][ T7207] do_syscall_64+0xcc/0x370 [ 55.109538][ T7207] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 55.115404][ T7207] RIP: 0033:0x47c530 [ 55.119279][ T7207] 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 [ 55.138857][ T7207] RSP: 002b:000000c4202ef810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 55.147503][ T7207] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 55.155457][ T7207] RDX: 0000000000001000 RSI: 000000c420180000 RDI: 0000000000000003 [ 55.163411][ T7207] RBP: 000000c4202ef868 R08: 0000000000000000 R09: 0000000000000000 [ 55.171359][ T7207] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008 [ 55.179306][ T7207] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 55.188054][ T7207] Kernel Offset: disabled [ 55.192370][ T7207] Rebooting in 86400 seconds..