[ 43.182207][ T25] audit: type=1800 audit(1571756641.084:22): pid=7136 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0 [ 43.215369][ T25] audit: type=1800 audit(1571756641.084:23): pid=7136 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rsyslog" dev="sda1" ino=2475 res=0 [ 43.245112][ T25] audit: type=1800 audit(1571756641.094:24): pid=7136 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="sudo" dev="sda1" ino=2487 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 '10.128.10.37' (ECDSA) to the list of known hosts. 2019/10/22 15:04:09 fuzzer started 2019/10/22 15:04:10 dialing manager at 10.128.0.105:33369 2019/10/22 15:04:10 syscalls: 2524 2019/10/22 15:04:10 code coverage: enabled 2019/10/22 15:04:10 comparison tracing: enabled 2019/10/22 15:04:10 extra coverage: extra coverage is not supported by the kernel 2019/10/22 15:04:10 setuid sandbox: enabled 2019/10/22 15:04:10 namespace sandbox: enabled 2019/10/22 15:04:10 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 15:04:10 fault injection: enabled 2019/10/22 15:04:10 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 15:04:10 net packet injection: enabled 2019/10/22 15:04:10 net device setup: enabled 2019/10/22 15:04:10 concurrency sanitizer: enabled syzkaller login: [ 53.445220][ T7291] ================================================================== [ 53.453368][ T7291] BUG: KCSAN: data-race in __tcp_select_window / tcp_add_backlog [ 53.461093][ T7291] [ 53.463419][ T7291] write to 0xffff88811c94e12c of 4 bytes by interrupt on cpu 0: [ 53.471125][ T7291] tcp_add_backlog+0x4a0/0xcc0 [ 53.475865][ T7291] tcp_v4_rcv+0x1a60/0x1bb0 [ 53.480343][ T7291] ip_protocol_deliver_rcu+0x4d/0x420 [ 53.485691][ T7291] ip_local_deliver_finish+0x110/0x140 [ 53.491124][ T7291] ip_local_deliver+0x133/0x210 [ 53.496528][ T7291] ip_rcv_finish+0x121/0x160 [ 53.501094][ T7291] ip_rcv+0x18f/0x1a0 [ 53.505096][ T7291] __netif_receive_skb_one_core+0xa7/0xe0 [ 53.510918][ T7291] __netif_receive_skb+0x37/0xf0 [ 53.515846][ T7291] netif_receive_skb_internal+0x59/0x190 [ 53.521459][ T7291] napi_gro_receive+0x28f/0x330 [ 53.526292][ T7291] receive_buf+0x284/0x30b0 [ 53.530772][ T7291] virtnet_poll+0x436/0x7d0 [ 53.535300][ T7291] net_rx_action+0x3ae/0xa90 [ 53.539867][ T7291] [ 53.542186][ T7291] read to 0xffff88811c94e12c of 4 bytes by task 7291 on cpu 1: [ 53.549703][ T7291] __tcp_select_window+0x6b/0x4d0 [ 53.554701][ T7291] __tcp_transmit_skb+0x700/0x1d60 [ 53.559796][ T7291] __tcp_send_ack+0x246/0x300 [ 53.564449][ T7291] tcp_send_ack+0x34/0x40 [ 53.568754][ T7291] tcp_cleanup_rbuf+0x130/0x360 [ 53.573580][ T7291] tcp_recvmsg+0x633/0x1a30 [ 53.578063][ T7291] inet_recvmsg+0xbb/0x250 [ 53.582466][ T7291] sock_recvmsg+0x92/0xb0 [ 53.586773][ T7291] sock_read_iter+0x15f/0x1e0 [ 53.591436][ T7291] new_sync_read+0x389/0x4f0 [ 53.595999][ T7291] __vfs_read+0xb1/0xc0 [ 53.600145][ T7291] vfs_read+0x143/0x2c0 [ 53.604295][ T7291] ksys_read+0xd5/0x1b0 [ 53.608427][ T7291] [ 53.610733][ T7291] Reported by Kernel Concurrency Sanitizer on: [ 53.616867][ T7291] CPU: 1 PID: 7291 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 53.624293][ T7291] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.634323][ T7291] ================================================================== [ 53.642356][ T7291] Kernel panic - not syncing: panic_on_warn set ... [ 53.648916][ T7291] CPU: 1 PID: 7291 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 53.656431][ T7291] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.668047][ T7291] Call Trace: [ 53.671324][ T7291] dump_stack+0xf5/0x159 [ 53.675558][ T7291] panic+0x210/0x640 [ 53.679449][ T7291] ? sock_read_iter+0x15f/0x1e0 [ 53.684303][ T7291] ? vprintk_func+0x8d/0x140 [ 53.688885][ T7291] kcsan_report.cold+0xc/0x10 [ 53.693561][ T7291] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 53.699257][ T7291] __tsan_read4+0x2c/0x30 [ 53.703576][ T7291] __tcp_select_window+0x6b/0x4d0 [ 53.708592][ T7291] __tcp_transmit_skb+0x700/0x1d60 [ 53.713688][ T7291] __tcp_send_ack+0x246/0x300 [ 53.718367][ T7291] tcp_send_ack+0x34/0x40 [ 53.722680][ T7291] tcp_cleanup_rbuf+0x130/0x360 [ 53.727511][ T7291] tcp_recvmsg+0x633/0x1a30 [ 53.731998][ T7291] inet_recvmsg+0xbb/0x250 [ 53.736401][ T7291] ? __tsan_read8+0x2c/0x30 [ 53.740885][ T7291] ? inet_sendpage+0x100/0x100 [ 53.745628][ T7291] sock_recvmsg+0x92/0xb0 [ 53.749934][ T7291] sock_read_iter+0x15f/0x1e0 [ 53.754603][ T7291] new_sync_read+0x389/0x4f0 [ 53.759196][ T7291] __vfs_read+0xb1/0xc0 [ 53.763332][ T7291] vfs_read+0x143/0x2c0 [ 53.767477][ T7291] ksys_read+0xd5/0x1b0 [ 53.771611][ T7291] __x64_sys_read+0x4c/0x60 [ 53.776368][ T7291] do_syscall_64+0xcc/0x370 [ 53.780854][ T7291] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.786719][ T7291] RIP: 0033:0x47c530 [ 53.790595][ T7291] 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 [ 53.810173][ T7291] RSP: 002b:000000c4204f57d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 53.818558][ T7291] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 53.826507][ T7291] RDX: 0000000000001000 RSI: 000000c4203a6000 RDI: 0000000000000003 [ 53.834465][ T7291] RBP: 000000c4204f5830 R08: 0000000000000000 R09: 0000000000000000 [ 53.842424][ T7291] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000100 [ 53.850385][ T7291] R13: ffffffffffffffff R14: 0000000000000040 R15: ffffffffffffffff [ 53.860035][ T7291] Kernel Offset: disabled [ 53.864356][ T7291] Rebooting in 86400 seconds..