[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.327581][ T26] audit: type=1800 audit(1571345596.883:25): pid=7004 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.371626][ T26] audit: type=1800 audit(1571345596.883:26): pid=7004 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.392712][ T26] audit: type=1800 audit(1571345596.883:27): pid=7004 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 '10.128.1.51' (ECDSA) to the list of known hosts. 2019/10/17 20:53:23 fuzzer started 2019/10/17 20:53:25 dialing manager at 10.128.0.105:43535 2019/10/17 20:53:25 syscalls: 2524 2019/10/17 20:53:25 code coverage: enabled 2019/10/17 20:53:25 comparison tracing: enabled 2019/10/17 20:53:25 extra coverage: extra coverage is not supported by the kernel 2019/10/17 20:53:25 setuid sandbox: enabled 2019/10/17 20:53:25 namespace sandbox: enabled 2019/10/17 20:53:25 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/17 20:53:25 fault injection: enabled 2019/10/17 20:53:25 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/17 20:53:25 net packet injection: enabled 2019/10/17 20:53:25 net device setup: enabled 2019/10/17 20:53:25 concurrency sanitizer: enabled syzkaller login: [ 42.890191][ T7156] ================================================================== [ 42.898436][ T7156] BUG: KCSAN: data-race in tcp_poll / tcp_recvmsg [ 42.904861][ T7156] [ 42.907182][ T7156] read to 0xffff8881235f45fc of 4 bytes by task 7153 on cpu 1: [ 42.914713][ T7156] tcp_poll+0x1cc/0x6b0 [ 42.918850][ T7156] sock_poll+0xed/0x250 [ 42.922999][ T7156] ep_item_poll.isra.0+0x90/0x190 [ 42.928013][ T7156] ep_send_events_proc+0x113/0x590 [ 42.933103][ T7156] ep_scan_ready_list.constprop.0+0x189/0x500 [ 42.939157][ T7156] ep_poll+0xe3/0x900 [ 42.943114][ T7156] do_epoll_wait+0x162/0x180 [ 42.947694][ T7156] __x64_sys_epoll_pwait+0xcd/0x180 [ 42.952869][ T7156] do_syscall_64+0xcc/0x370 [ 42.957351][ T7156] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 42.963209][ T7156] [ 42.965531][ T7156] write to 0xffff8881235f45fc of 4 bytes by task 7156 on cpu 0: [ 42.973237][ T7156] tcp_recvmsg+0xd86/0x1a30 [ 42.977725][ T7156] inet_recvmsg+0xbb/0x250 [ 42.982131][ T7156] sock_recvmsg+0x92/0xb0 [ 42.986435][ T7156] sock_read_iter+0x15f/0x1e0 [ 42.991086][ T7156] new_sync_read+0x389/0x4f0 [ 42.995664][ T7156] __vfs_read+0xb1/0xc0 [ 42.999796][ T7156] vfs_read+0x143/0x2c0 [ 43.003929][ T7156] ksys_read+0xd5/0x1b0 [ 43.008149][ T7156] __x64_sys_read+0x4c/0x60 [ 43.012657][ T7156] do_syscall_64+0xcc/0x370 [ 43.017138][ T7156] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 43.022998][ T7156] [ 43.025300][ T7156] Reported by Kernel Concurrency Sanitizer on: [ 43.031442][ T7156] CPU: 0 PID: 7156 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 43.038870][ T7156] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.048913][ T7156] ================================================================== [ 43.056949][ T7156] Kernel panic - not syncing: panic_on_warn set ... [ 43.063522][ T7156] CPU: 0 PID: 7156 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 43.070959][ T7156] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.080989][ T7156] Call Trace: [ 43.084277][ T7156] dump_stack+0xf5/0x159 [ 43.088970][ T7156] panic+0x210/0x640 [ 43.092852][ T7156] ? __x64_sys_read+0x4c/0x60 [ 43.097514][ T7156] ? vprintk_func+0x8d/0x140 [ 43.102086][ T7156] kcsan_report.cold+0xc/0x10 [ 43.106752][ T7156] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 43.112290][ T7156] __tsan_write4+0x32/0x40 [ 43.116686][ T7156] tcp_recvmsg+0xd86/0x1a30 [ 43.121184][ T7156] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 43.126803][ T7156] inet_recvmsg+0xbb/0x250 [ 43.131208][ T7156] ? __tsan_read8+0x2c/0x30 [ 43.135706][ T7156] ? inet_sendpage+0x100/0x100 [ 43.140454][ T7156] sock_recvmsg+0x92/0xb0 [ 43.144780][ T7156] sock_read_iter+0x15f/0x1e0 [ 43.149463][ T7156] new_sync_read+0x389/0x4f0 [ 43.154039][ T7156] __vfs_read+0xb1/0xc0 [ 43.158185][ T7156] vfs_read+0x143/0x2c0 [ 43.162332][ T7156] ksys_read+0xd5/0x1b0 [ 43.166480][ T7156] __x64_sys_read+0x4c/0x60 [ 43.170975][ T7156] do_syscall_64+0xcc/0x370 [ 43.175461][ T7156] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 43.181436][ T7156] RIP: 0033:0x47c530 [ 43.185322][ T7156] 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 [ 43.204904][ T7156] RSP: 002b:000000c4202f5850 EFLAGS: 00000206 ORIG_RAX: 0000000000000000 [ 43.213291][ T7156] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 43.221253][ T7156] RDX: 0000000000001000 RSI: 000000c42031a000 RDI: 0000000000000003 [ 43.229214][ T7156] RBP: 000000c4202f58a8 R08: 0000000000000000 R09: 0000000000000000 [ 43.237163][ T7156] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000004 [ 43.245126][ T7156] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 43.254370][ T7156] Kernel Offset: disabled [ 43.258692][ T7156] Rebooting in 86400 seconds..