[ 35.344673][ T26] audit: type=1800 audit(1571757817.182:25): pid=7065 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.382544][ T26] audit: type=1800 audit(1571757817.182:26): pid=7065 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.406083][ T26] audit: type=1800 audit(1571757817.182:27): pid=7065 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. [ 35.904312][ T7131] sshd (7131) 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 '10.128.0.72' (ECDSA) to the list of known hosts. 2019/10/22 15:23:48 fuzzer started 2019/10/22 15:23:49 dialing manager at 10.128.0.105:33369 2019/10/22 15:23:49 syscalls: 2524 2019/10/22 15:23:49 code coverage: enabled 2019/10/22 15:23:49 comparison tracing: enabled 2019/10/22 15:23:49 extra coverage: extra coverage is not supported by the kernel 2019/10/22 15:23:49 setuid sandbox: enabled 2019/10/22 15:23:49 namespace sandbox: enabled 2019/10/22 15:23:49 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 15:23:49 fault injection: enabled 2019/10/22 15:23:49 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 15:23:49 net packet injection: enabled 2019/10/22 15:23:49 net device setup: enabled 2019/10/22 15:23:49 concurrency sanitizer: enabled syzkaller login: [ 48.108515][ T7218] ================================================================== [ 48.116663][ T7218] BUG: KCSAN: data-race in tcp_add_backlog / tcp_grow_window.isra.0 [ 48.124643][ T7218] [ 48.126957][ T7218] write to 0xffff88812a3512ec of 4 bytes by interrupt on cpu 1: [ 48.134662][ T7218] tcp_add_backlog+0x4a0/0xcc0 [ 48.139400][ T7218] tcp_v4_rcv+0x1a60/0x1bb0 [ 48.143890][ T7218] ip_protocol_deliver_rcu+0x4d/0x420 [ 48.149418][ T7218] ip_local_deliver_finish+0x110/0x140 [ 48.154962][ T7218] ip_local_deliver+0x133/0x210 [ 48.159784][ T7218] ip_rcv_finish+0x121/0x160 [ 48.164347][ T7218] ip_rcv+0x18f/0x1a0 [ 48.168306][ T7218] __netif_receive_skb_one_core+0xa7/0xe0 [ 48.174002][ T7218] __netif_receive_skb+0x37/0xf0 [ 48.178915][ T7218] netif_receive_skb_internal+0x59/0x190 [ 48.184523][ T7218] napi_gro_receive+0x28f/0x330 [ 48.189366][ T7218] receive_buf+0x284/0x30b0 [ 48.193845][ T7218] virtnet_poll+0x436/0x7d0 [ 48.198327][ T7218] net_rx_action+0x3ae/0xa90 [ 48.202885][ T7218] [ 48.205208][ T7218] read to 0xffff88812a3512ec of 4 bytes by task 7218 on cpu 0: [ 48.213333][ T7218] tcp_grow_window.isra.0+0x6b/0x480 [ 48.218592][ T7218] tcp_event_data_recv+0x68f/0x990 [ 48.223683][ T7218] tcp_rcv_established+0xbfe/0xf50 [ 48.228771][ T7218] tcp_v4_do_rcv+0x381/0x4e0 [ 48.233342][ T7218] __release_sock+0x135/0x1e0 [ 48.237993][ T7218] release_sock+0x61/0x160 [ 48.242388][ T7218] tcp_recvmsg+0x63b/0x1a30 [ 48.246879][ T7218] inet_recvmsg+0xbb/0x250 [ 48.251273][ T7218] sock_recvmsg+0x92/0xb0 [ 48.255594][ T7218] sock_read_iter+0x15f/0x1e0 [ 48.260248][ T7218] new_sync_read+0x389/0x4f0 [ 48.264812][ T7218] __vfs_read+0xb1/0xc0 [ 48.268950][ T7218] vfs_read+0x143/0x2c0 [ 48.273075][ T7218] [ 48.275380][ T7218] Reported by Kernel Concurrency Sanitizer on: [ 48.281515][ T7218] CPU: 0 PID: 7218 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 48.288951][ T7218] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.298992][ T7218] ================================================================== [ 48.307027][ T7218] Kernel panic - not syncing: panic_on_warn set ... [ 48.313606][ T7218] CPU: 0 PID: 7218 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 48.321052][ T7218] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.331084][ T7218] Call Trace: [ 48.334361][ T7218] dump_stack+0xf5/0x159 [ 48.338582][ T7218] panic+0x210/0x640 [ 48.342459][ T7218] ? sock_recvmsg+0x92/0xb0 [ 48.346938][ T7218] ? vprintk_func+0x8d/0x140 [ 48.351532][ T7218] kcsan_report.cold+0xc/0x10 [ 48.356204][ T7218] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 48.361733][ T7218] __tsan_read4+0x2c/0x30 [ 48.366049][ T7218] tcp_grow_window.isra.0+0x6b/0x480 [ 48.371313][ T7218] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 48.376947][ T7218] tcp_event_data_recv+0x68f/0x990 [ 48.382054][ T7218] tcp_rcv_established+0xbfe/0xf50 [ 48.387148][ T7218] ? ipv4_dst_check+0xc6/0xf0 [ 48.391814][ T7218] tcp_v4_do_rcv+0x381/0x4e0 [ 48.396393][ T7218] __release_sock+0x135/0x1e0 [ 48.401106][ T7218] release_sock+0x61/0x160 [ 48.405532][ T7218] tcp_recvmsg+0x63b/0x1a30 [ 48.410037][ T7218] inet_recvmsg+0xbb/0x250 [ 48.414451][ T7218] ? __tsan_read8+0x2c/0x30 [ 48.418937][ T7218] ? inet_sendpage+0x100/0x100 [ 48.423698][ T7218] sock_recvmsg+0x92/0xb0 [ 48.428021][ T7218] sock_read_iter+0x15f/0x1e0 [ 48.432692][ T7218] new_sync_read+0x389/0x4f0 [ 48.437268][ T7218] __vfs_read+0xb1/0xc0 [ 48.441506][ T7218] vfs_read+0x143/0x2c0 [ 48.445669][ T7218] ksys_read+0xd5/0x1b0 [ 48.449848][ T7218] __x64_sys_read+0x4c/0x60 [ 48.454335][ T7218] do_syscall_64+0xcc/0x370 [ 48.458819][ T7218] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 48.464688][ T7218] RIP: 0033:0x47c530 [ 48.468571][ T7218] 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 [ 48.488167][ T7218] RSP: 002b:000000c4204e1810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 48.496559][ T7218] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 48.504506][ T7218] RDX: 0000000000001000 RSI: 000000c4203e0000 RDI: 0000000000000003 [ 48.512453][ T7218] RBP: 000000c4204e1868 R08: 0000000000000000 R09: 0000000000000000 [ 48.520399][ T7218] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000010 [ 48.528358][ T7218] R13: ffffffffffffffff R14: 0000000000000010 R15: ffffffffffffffff [ 48.537701][ T7218] Kernel Offset: disabled [ 48.542022][ T7218] Rebooting in 86400 seconds..