[ 36.884206][ T26] audit: type=1800 audit(1571135173.109:21): pid=7251 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 36.915522][ T26] audit: type=1800 audit(1571135173.109:22): pid=7251 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0 [ 36.936726][ T26] audit: type=1800 audit(1571135173.109:23): pid=7251 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rsyslog" dev="sda1" ino=2475 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] 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 '10.128.0.49' (ECDSA) to the list of known hosts. 2019/10/15 10:26:23 fuzzer started 2019/10/15 10:26:25 dialing manager at 10.128.0.105:33637 2019/10/15 10:26:25 syscalls: 2523 2019/10/15 10:26:25 code coverage: enabled 2019/10/15 10:26:25 comparison tracing: enabled 2019/10/15 10:26:25 extra coverage: extra coverage is not supported by the kernel 2019/10/15 10:26:25 setuid sandbox: enabled 2019/10/15 10:26:25 namespace sandbox: enabled 2019/10/15 10:26:25 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/15 10:26:25 fault injection: enabled 2019/10/15 10:26:25 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/15 10:26:25 net packet injection: enabled 2019/10/15 10:26:25 net device setup: enabled 2019/10/15 10:26:25 concurrency sanitizer: enabled syzkaller login: [ 49.526227][ T7417] ================================================================== [ 49.534653][ T7417] BUG: KCSAN: data-race in tcp_poll / tcp_recvmsg [ 49.541050][ T7417] [ 49.543370][ T7417] read to 0xffff888125ff77b4 of 4 bytes by task 7402 on cpu 0: [ 49.550899][ T7417] tcp_poll+0x1cc/0x6b0 [ 49.555040][ T7417] sock_poll+0xed/0x250 [ 49.559176][ T7417] ep_item_poll.isra.0+0x90/0x190 [ 49.564176][ T7417] ep_send_events_proc+0x113/0x5c0 [ 49.569281][ T7417] ep_scan_ready_list.constprop.0+0x189/0x500 [ 49.575333][ T7417] ep_poll+0xe3/0x900 [ 49.579408][ T7417] do_epoll_wait+0x162/0x180 [ 49.584074][ T7417] __x64_sys_epoll_pwait+0xcd/0x170 [ 49.589270][ T7417] do_syscall_64+0xcf/0x2f0 [ 49.593758][ T7417] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.599948][ T7417] [ 49.602275][ T7417] write to 0xffff888125ff77b4 of 4 bytes by task 7417 on cpu 1: [ 49.609912][ T7417] tcp_recvmsg+0xd86/0x1a30 [ 49.614399][ T7417] inet_recvmsg+0xbb/0x250 [ 49.618798][ T7417] sock_recvmsg+0x92/0xb0 [ 49.623121][ T7417] sock_read_iter+0x15f/0x1e0 [ 49.627793][ T7417] new_sync_read+0x389/0x4f0 [ 49.632380][ T7417] __vfs_read+0xb1/0xc0 [ 49.636544][ T7417] vfs_read+0x143/0x2c0 [ 49.640688][ T7417] ksys_read+0xd5/0x1b0 [ 49.644839][ T7417] __x64_sys_read+0x4c/0x60 [ 49.649362][ T7417] do_syscall_64+0xcf/0x2f0 [ 49.653848][ T7417] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.659713][ T7417] [ 49.662019][ T7417] Reported by Kernel Concurrency Sanitizer on: [ 49.668157][ T7417] CPU: 1 PID: 7417 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 49.675241][ T7417] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.685284][ T7417] ================================================================== [ 49.693352][ T7417] Kernel panic - not syncing: panic_on_warn set ... [ 49.700213][ T7417] CPU: 1 PID: 7417 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 49.707305][ T7417] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.717341][ T7417] Call Trace: [ 49.720641][ T7417] dump_stack+0xf5/0x159 [ 49.724872][ T7417] panic+0x209/0x639 [ 49.728771][ T7417] ? __x64_sys_read+0x4c/0x60 [ 49.733434][ T7417] ? vprintk_func+0x8d/0x140 [ 49.738008][ T7417] kcsan_report.cold+0xc/0x1b [ 49.742673][ T7417] __kcsan_setup_watchpoint+0x3ee/0x510 [ 49.748226][ T7417] __tsan_write4+0x32/0x40 [ 49.752646][ T7417] tcp_recvmsg+0xd86/0x1a30 [ 49.757137][ T7417] ? __kcsan_setup_watchpoint+0x96/0x510 [ 49.762762][ T7417] inet_recvmsg+0xbb/0x250 [ 49.767163][ T7417] ? __tsan_read8+0x2c/0x30 [ 49.771666][ T7417] ? inet_sendpage+0x100/0x100 [ 49.776416][ T7417] sock_recvmsg+0x92/0xb0 [ 49.780745][ T7417] sock_read_iter+0x15f/0x1e0 [ 49.785414][ T7417] new_sync_read+0x389/0x4f0 [ 49.790019][ T7417] __vfs_read+0xb1/0xc0 [ 49.794167][ T7417] vfs_read+0x143/0x2c0 [ 49.798342][ T7417] ksys_read+0xd5/0x1b0 [ 49.802498][ T7417] __x64_sys_read+0x4c/0x60 [ 49.806985][ T7417] do_syscall_64+0xcf/0x2f0 [ 49.811474][ T7417] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.817346][ T7417] RIP: 0033:0x47c530 [ 49.821243][ T7417] 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 [ 49.840941][ T7417] RSP: 002b:000000c4202f17d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 49.849351][ T7417] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 49.857329][ T7417] RDX: 0000000000001000 RSI: 000000c420362000 RDI: 0000000000000003 [ 49.865293][ T7417] RBP: 000000c4202f1830 R08: 0000000000000000 R09: 0000000000000000 [ 49.873261][ T7417] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000100 [ 49.881332][ T7417] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 49.890956][ T7417] Kernel Offset: disabled [ 49.895310][ T7417] Rebooting in 86400 seconds..