[ 33.738581][ T25] audit: type=1800 audit(1572278886.113:25): pid=6934 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 33.758421][ T25] audit: type=1800 audit(1572278886.113:26): pid=6934 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 33.778353][ T25] audit: type=1800 audit(1572278886.113:27): pid=6934 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. [ 34.024464][ T6998] sshd (6998) used greatest stack depth: 10136 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.9' (ECDSA) to the list of known hosts. 2019/10/28 16:08:16 fuzzer started 2019/10/28 16:08:17 dialing manager at 10.128.0.105:45117 2019/10/28 16:08:17 syscalls: 2540 2019/10/28 16:08:17 code coverage: enabled 2019/10/28 16:08:17 comparison tracing: enabled 2019/10/28 16:08:17 extra coverage: extra coverage is not supported by the kernel 2019/10/28 16:08:17 setuid sandbox: enabled 2019/10/28 16:08:17 namespace sandbox: enabled 2019/10/28 16:08:17 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/28 16:08:17 fault injection: enabled 2019/10/28 16:08:17 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/28 16:08:17 net packet injection: enabled 2019/10/28 16:08:17 net device setup: enabled 2019/10/28 16:08:17 concurrency sanitizer: enabled 2019/10/28 16:08:18 adding functions to KCSAN blacklist: '__hrtimer_run_queues' 'pid_update_inode' 'tick_sched_do_timer' 'rcu_gp_fqs_loop' '__tcp_select_window' syzkaller login: [ 46.362916][ T7086] ================================================================== [ 46.371063][ T7086] BUG: KCSAN: data-race in tcp_add_backlog / tcp_grow_window.isra.0 [ 46.379023][ T7086] [ 46.381333][ T7086] write to 0xffff888126f272ec of 4 bytes by interrupt on cpu 0: [ 46.388961][ T7086] tcp_add_backlog+0x4a0/0xcc0 [ 46.393706][ T7086] tcp_v4_rcv+0x1a60/0x1bb0 [ 46.398184][ T7086] ip_protocol_deliver_rcu+0x4d/0x420 [ 46.403535][ T7086] ip_local_deliver_finish+0x110/0x140 [ 46.408981][ T7086] ip_local_deliver+0x133/0x210 [ 46.413816][ T7086] ip_rcv_finish+0x121/0x160 [ 46.418391][ T7086] ip_rcv+0x18f/0x1a0 [ 46.422360][ T7086] __netif_receive_skb_one_core+0xa7/0xe0 [ 46.428053][ T7086] __netif_receive_skb+0x37/0xf0 [ 46.432996][ T7086] netif_receive_skb_internal+0x59/0x190 [ 46.438704][ T7086] napi_gro_receive+0x28f/0x330 [ 46.443545][ T7086] receive_buf+0x284/0x30b0 [ 46.448038][ T7086] virtnet_poll+0x436/0x7d0 [ 46.452521][ T7086] net_rx_action+0x3ae/0xa90 [ 46.457079][ T7086] [ 46.459389][ T7086] read to 0xffff888126f272ec of 4 bytes by task 7086 on cpu 1: [ 46.466923][ T7086] tcp_grow_window.isra.0+0x6b/0x480 [ 46.472251][ T7086] tcp_event_data_recv+0x68f/0x990 [ 46.477339][ T7086] tcp_rcv_established+0xbfe/0xf50 [ 46.482427][ T7086] tcp_v4_do_rcv+0x381/0x4e0 [ 46.486994][ T7086] __release_sock+0x135/0x1e0 [ 46.491646][ T7086] release_sock+0x61/0x160 [ 46.496055][ T7086] tcp_recvmsg+0x63b/0x1a30 [ 46.500652][ T7086] inet_recvmsg+0xbb/0x250 [ 46.505052][ T7086] sock_recvmsg+0x92/0xb0 [ 46.509379][ T7086] sock_read_iter+0x15f/0x1e0 [ 46.514065][ T7086] new_sync_read+0x389/0x4f0 [ 46.518636][ T7086] __vfs_read+0xb1/0xc0 [ 46.522770][ T7086] vfs_read+0x143/0x2c0 [ 46.526895][ T7086] [ 46.529202][ T7086] Reported by Kernel Concurrency Sanitizer on: [ 46.535368][ T7086] CPU: 1 PID: 7086 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 46.542794][ T7086] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.552835][ T7086] ================================================================== [ 46.560871][ T7086] Kernel panic - not syncing: panic_on_warn set ... [ 46.567445][ T7086] CPU: 1 PID: 7086 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 46.574885][ T7086] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.584914][ T7086] Call Trace: [ 46.588195][ T7086] dump_stack+0xf5/0x159 [ 46.592416][ T7086] panic+0x210/0x640 [ 46.596304][ T7086] ? sock_recvmsg+0x92/0xb0 [ 46.600785][ T7086] ? vprintk_func+0x8d/0x140 [ 46.605369][ T7086] kcsan_report.cold+0xc/0x10 [ 46.610028][ T7086] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 46.615552][ T7086] __tsan_read4+0x2c/0x30 [ 46.619858][ T7086] tcp_grow_window.isra.0+0x6b/0x480 [ 46.625130][ T7086] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 46.630754][ T7086] tcp_event_data_recv+0x68f/0x990 [ 46.635844][ T7086] tcp_rcv_established+0xbfe/0xf50 [ 46.640938][ T7086] ? ipv4_dst_check+0xc6/0xf0 [ 46.645606][ T7086] tcp_v4_do_rcv+0x381/0x4e0 [ 46.650175][ T7086] __release_sock+0x135/0x1e0 [ 46.654833][ T7086] release_sock+0x61/0x160 [ 46.659229][ T7086] tcp_recvmsg+0x63b/0x1a30 [ 46.663740][ T7086] inet_recvmsg+0xbb/0x250 [ 46.668136][ T7086] ? __tsan_read8+0x2c/0x30 [ 46.672613][ T7086] ? inet_sendpage+0x100/0x100 [ 46.677355][ T7086] sock_recvmsg+0x92/0xb0 [ 46.681683][ T7086] sock_read_iter+0x15f/0x1e0 [ 46.686342][ T7086] new_sync_read+0x389/0x4f0 [ 46.691017][ T7086] __vfs_read+0xb1/0xc0 [ 46.695163][ T7086] vfs_read+0x143/0x2c0 [ 46.699305][ T7086] ksys_read+0xd5/0x1b0 [ 46.703439][ T7086] __x64_sys_read+0x4c/0x60 [ 46.707921][ T7086] do_syscall_64+0xcc/0x370 [ 46.712407][ T7086] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 46.718273][ T7086] RIP: 0033:0x47c530 [ 46.722161][ T7086] 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 [ 46.741747][ T7086] RSP: 002b:000000c4201517d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 46.750134][ T7086] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 46.758089][ T7086] RDX: 0000000000001000 RSI: 000000c4203de000 RDI: 0000000000000003 [ 46.766050][ T7086] RBP: 000000c420151830 R08: 0000000000000000 R09: 0000000000000000 [ 46.773999][ T7086] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000080 [ 46.781961][ T7086] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 46.791264][ T7086] Kernel Offset: disabled [ 46.795586][ T7086] Rebooting in 86400 seconds..