[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.828150][ T25] audit: type=1800 audit(1571056554.964:25): pid=7151 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.876989][ T25] audit: type=1800 audit(1571056554.964:26): pid=7151 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.901683][ T25] audit: type=1800 audit(1571056554.964:27): pid=7151 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 '10.128.0.109' (ECDSA) to the list of known hosts. 2019/10/14 12:36:06 fuzzer started 2019/10/14 12:36:07 dialing manager at 10.128.0.105:43961 2019/10/14 12:36:07 syscalls: 2523 2019/10/14 12:36:07 code coverage: enabled 2019/10/14 12:36:07 comparison tracing: enabled 2019/10/14 12:36:07 extra coverage: extra coverage is not supported by the kernel 2019/10/14 12:36:07 setuid sandbox: enabled 2019/10/14 12:36:07 namespace sandbox: enabled 2019/10/14 12:36:07 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/14 12:36:07 fault injection: enabled 2019/10/14 12:36:07 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/14 12:36:07 net packet injection: enabled 2019/10/14 12:36:07 net device setup: enabled 2019/10/14 12:36:07 concurrency sanitizer: enabled syzkaller login: [ 49.864112][ T7314] ================================================================== [ 49.872236][ T7314] BUG: KCSAN: data-race in tcp_poll / tcp_recvmsg [ 49.878618][ T7314] [ 49.880936][ T7314] read to 0xffff8881215825b4 of 4 bytes by task 7305 on cpu 0: [ 49.888450][ T7314] tcp_poll+0x1cc/0x6b0 [ 49.892579][ T7314] sock_poll+0xed/0x250 [ 49.896709][ T7314] ep_item_poll.isra.0+0x90/0x190 [ 49.901709][ T7314] ep_send_events_proc+0x113/0x5c0 [ 49.906798][ T7314] ep_scan_ready_list.constprop.0+0x189/0x500 [ 49.912869][ T7314] ep_poll+0xe3/0x900 [ 49.916826][ T7314] do_epoll_wait+0x162/0x180 [ 49.921419][ T7314] __x64_sys_epoll_pwait+0xcd/0x170 [ 49.926589][ T7314] do_syscall_64+0xcf/0x2f0 [ 49.931069][ T7314] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.936929][ T7314] [ 49.939235][ T7314] write to 0xffff8881215825b4 of 4 bytes by task 7314 on cpu 1: [ 49.946835][ T7314] tcp_recvmsg+0xd86/0x1a30 [ 49.951319][ T7314] inet_recvmsg+0xbb/0x250 [ 49.955705][ T7314] sock_recvmsg+0x92/0xb0 [ 49.960008][ T7314] sock_read_iter+0x15f/0x1e0 [ 49.964656][ T7314] new_sync_read+0x389/0x4f0 [ 49.969216][ T7314] __vfs_read+0xb1/0xc0 [ 49.973343][ T7314] vfs_read+0x143/0x2c0 [ 49.977469][ T7314] ksys_read+0xd5/0x1b0 [ 49.981596][ T7314] __x64_sys_read+0x4c/0x60 [ 49.986071][ T7314] do_syscall_64+0xcf/0x2f0 [ 49.990551][ T7314] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.996409][ T7314] [ 49.998708][ T7314] Reported by Kernel Concurrency Sanitizer on: [ 50.004844][ T7314] CPU: 1 PID: 7314 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 50.011920][ T7314] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.021944][ T7314] ================================================================== [ 50.030007][ T7314] Kernel panic - not syncing: panic_on_warn set ... [ 50.036564][ T7314] CPU: 1 PID: 7314 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 50.043638][ T7314] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.053661][ T7314] Call Trace: [ 50.056928][ T7314] dump_stack+0xf5/0x159 [ 50.061161][ T7314] panic+0x209/0x639 [ 50.065039][ T7314] ? __x64_sys_read+0x4c/0x60 [ 50.069711][ T7314] ? vprintk_func+0x8d/0x140 [ 50.074297][ T7314] kcsan_report.cold+0xc/0x1b [ 50.078954][ T7314] __kcsan_setup_watchpoint+0x3ee/0x510 [ 50.084483][ T7314] __tsan_write4+0x32/0x40 [ 50.088874][ T7314] tcp_recvmsg+0xd86/0x1a30 [ 50.093360][ T7314] ? __kcsan_setup_watchpoint+0x96/0x510 [ 50.098980][ T7314] inet_recvmsg+0xbb/0x250 [ 50.103377][ T7314] ? __tsan_read8+0x2c/0x30 [ 50.107866][ T7314] ? inet_sendpage+0x100/0x100 [ 50.112606][ T7314] sock_recvmsg+0x92/0xb0 [ 50.116919][ T7314] sock_read_iter+0x15f/0x1e0 [ 50.121584][ T7314] new_sync_read+0x389/0x4f0 [ 50.126157][ T7314] __vfs_read+0xb1/0xc0 [ 50.130292][ T7314] vfs_read+0x143/0x2c0 [ 50.134426][ T7314] ksys_read+0xd5/0x1b0 [ 50.138593][ T7314] __x64_sys_read+0x4c/0x60 [ 50.143090][ T7314] do_syscall_64+0xcf/0x2f0 [ 50.147576][ T7314] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 50.153443][ T7314] RIP: 0033:0x47c530 [ 50.157325][ T7314] 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 [ 50.176903][ T7314] RSP: 002b:000000c4204eb810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 50.185295][ T7314] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 50.193240][ T7314] RDX: 0000000000001000 RSI: 000000c42030e000 RDI: 0000000000000003 [ 50.201187][ T7314] RBP: 000000c4204eb868 R08: 0000000000000000 R09: 0000000000000000 [ 50.209139][ T7314] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000020 [ 50.217085][ T7314] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 50.226219][ T7314] Kernel Offset: disabled [ 50.230536][ T7314] Rebooting in 86400 seconds..