[ 34.843295][ T26] audit: type=1800 audit(1571790178.898:25): pid=7036 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.862930][ T26] audit: type=1800 audit(1571790178.898:26): pid=7036 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.931068][ T26] audit: type=1800 audit(1571790178.988:27): pid=7036 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. [ 35.183617][ T7112] sshd (7112) 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 '10.128.0.90' (ECDSA) to the list of known hosts. 2019/10/23 00:23:09 fuzzer started 2019/10/23 00:23:09 dialing manager at 10.128.0.105:33369 2019/10/23 00:23:09 syscalls: 2524 2019/10/23 00:23:09 code coverage: enabled 2019/10/23 00:23:09 comparison tracing: enabled 2019/10/23 00:23:09 extra coverage: extra coverage is not supported by the kernel 2019/10/23 00:23:09 setuid sandbox: enabled 2019/10/23 00:23:09 namespace sandbox: enabled 2019/10/23 00:23:09 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/23 00:23:09 fault injection: enabled 2019/10/23 00:23:09 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/23 00:23:09 net packet injection: enabled 2019/10/23 00:23:09 net device setup: enabled 2019/10/23 00:23:09 concurrency sanitizer: enabled syzkaller login: [ 46.176382][ T7184] ================================================================== [ 46.184504][ T7184] BUG: KCSAN: data-race in tcp_add_backlog / tcp_grow_window.isra.0 [ 46.192450][ T7184] [ 46.194758][ T7184] write to 0xffff88812460b2ec of 4 bytes by interrupt on cpu 0: [ 46.202362][ T7184] tcp_add_backlog+0x4a0/0xcc0 [ 46.207100][ T7184] tcp_v4_rcv+0x1a60/0x1bb0 [ 46.211583][ T7184] ip_protocol_deliver_rcu+0x4d/0x420 [ 46.216926][ T7184] ip_local_deliver_finish+0x110/0x140 [ 46.222356][ T7184] ip_local_deliver+0x133/0x210 [ 46.227193][ T7184] ip_rcv_finish+0x121/0x160 [ 46.231755][ T7184] ip_rcv+0x18f/0x1a0 [ 46.235711][ T7184] __netif_receive_skb_one_core+0xa7/0xe0 [ 46.241403][ T7184] __netif_receive_skb+0x37/0xf0 [ 46.246354][ T7184] netif_receive_skb_internal+0x59/0x190 [ 46.251998][ T7184] napi_gro_receive+0x28f/0x330 [ 46.256912][ T7184] receive_buf+0x284/0x30b0 [ 46.261389][ T7184] virtnet_poll+0x436/0x7d0 [ 46.265867][ T7184] net_rx_action+0x3ae/0xa90 [ 46.270433][ T7184] [ 46.272741][ T7184] read to 0xffff88812460b2ec of 4 bytes by task 7184 on cpu 1: [ 46.280255][ T7184] tcp_grow_window.isra.0+0x6b/0x480 [ 46.285511][ T7184] tcp_event_data_recv+0x68f/0x990 [ 46.290702][ T7184] tcp_rcv_established+0xbfe/0xf50 [ 46.295790][ T7184] tcp_v4_do_rcv+0x381/0x4e0 [ 46.300358][ T7184] __release_sock+0x135/0x1e0 [ 46.305018][ T7184] release_sock+0x61/0x160 [ 46.309414][ T7184] tcp_recvmsg+0x63b/0x1a30 [ 46.313897][ T7184] inet_recvmsg+0xbb/0x250 [ 46.318302][ T7184] sock_recvmsg+0x92/0xb0 [ 46.322608][ T7184] sock_read_iter+0x15f/0x1e0 [ 46.327262][ T7184] new_sync_read+0x389/0x4f0 [ 46.331829][ T7184] __vfs_read+0xb1/0xc0 [ 46.335956][ T7184] vfs_read+0x143/0x2c0 [ 46.340083][ T7184] [ 46.342388][ T7184] Reported by Kernel Concurrency Sanitizer on: [ 46.348515][ T7184] CPU: 1 PID: 7184 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 46.355940][ T7184] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.365967][ T7184] ================================================================== [ 46.374026][ T7184] Kernel panic - not syncing: panic_on_warn set ... [ 46.380597][ T7184] CPU: 1 PID: 7184 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 46.388021][ T7184] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.398051][ T7184] Call Trace: [ 46.401323][ T7184] dump_stack+0xf5/0x159 [ 46.405540][ T7184] panic+0x210/0x640 [ 46.409413][ T7184] ? sock_recvmsg+0x92/0xb0 [ 46.413895][ T7184] ? vprintk_func+0x8d/0x140 [ 46.418466][ T7184] kcsan_report.cold+0xc/0x10 [ 46.423122][ T7184] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 46.428645][ T7184] __tsan_read4+0x2c/0x30 [ 46.432954][ T7184] tcp_grow_window.isra.0+0x6b/0x480 [ 46.438214][ T7184] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 46.443843][ T7184] tcp_event_data_recv+0x68f/0x990 [ 46.448946][ T7184] tcp_rcv_established+0xbfe/0xf50 [ 46.454055][ T7184] ? ipv4_dst_check+0xc6/0xf0 [ 46.458723][ T7184] tcp_v4_do_rcv+0x381/0x4e0 [ 46.463301][ T7184] __release_sock+0x135/0x1e0 [ 46.467956][ T7184] release_sock+0x61/0x160 [ 46.472353][ T7184] tcp_recvmsg+0x63b/0x1a30 [ 46.476839][ T7184] inet_recvmsg+0xbb/0x250 [ 46.481231][ T7184] ? __tsan_read8+0x2c/0x30 [ 46.485718][ T7184] ? inet_sendpage+0x100/0x100 [ 46.490462][ T7184] sock_recvmsg+0x92/0xb0 [ 46.494769][ T7184] sock_read_iter+0x15f/0x1e0 [ 46.499437][ T7184] new_sync_read+0x389/0x4f0 [ 46.504019][ T7184] __vfs_read+0xb1/0xc0 [ 46.508169][ T7184] vfs_read+0x143/0x2c0 [ 46.512313][ T7184] ksys_read+0xd5/0x1b0 [ 46.516457][ T7184] __x64_sys_read+0x4c/0x60 [ 46.520938][ T7184] do_syscall_64+0xcc/0x370 [ 46.525420][ T7184] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 46.531287][ T7184] RIP: 0033:0x47c530 [ 46.535161][ T7184] 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 [ 46.554741][ T7184] RSP: 002b:000000c420301810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 46.563125][ T7184] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 46.571073][ T7184] RDX: 0000000000001000 RSI: 000000c420314000 RDI: 0000000000000003 [ 46.579990][ T7184] RBP: 000000c420301868 R08: 0000000000000000 R09: 0000000000000000 [ 46.587939][ T7184] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000200 [ 46.595885][ T7184] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 46.605185][ T7184] Kernel Offset: disabled [ 46.609501][ T7184] Rebooting in 86400 seconds..