[info] Using makefile-style concurrent boot in runlevel 2. [ 43.690408][ T25] audit: type=1800 audit(1571785671.705:21): pid=7069 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 43.736600][ T25] audit: type=1800 audit(1571785671.705:22): pid=7069 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 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 '10.128.15.205' (ECDSA) to the list of known hosts. 2019/10/22 23:08:02 fuzzer started 2019/10/22 23:08:03 dialing manager at 10.128.0.105:33369 2019/10/22 23:08:03 syscalls: 2524 2019/10/22 23:08:03 code coverage: enabled 2019/10/22 23:08:03 comparison tracing: enabled 2019/10/22 23:08:03 extra coverage: extra coverage is not supported by the kernel 2019/10/22 23:08:03 setuid sandbox: enabled 2019/10/22 23:08:03 namespace sandbox: enabled 2019/10/22 23:08:03 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 23:08:03 fault injection: enabled 2019/10/22 23:08:03 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 23:08:03 net packet injection: enabled 2019/10/22 23:08:03 net device setup: enabled 2019/10/22 23:08:03 concurrency sanitizer: enabled syzkaller login: [ 56.094076][ T7232] ================================================================== [ 56.102357][ T7232] BUG: KCSAN: data-race in tcp_add_backlog / tcp_rcv_space_adjust [ 56.110566][ T7232] [ 56.112926][ T7232] read to 0xffff88811eedb30c of 4 bytes by interrupt on cpu 1: [ 56.120456][ T7232] tcp_add_backlog+0x43/0xcc0 [ 56.125194][ T7232] tcp_v4_rcv+0x1a60/0x1bb0 [ 56.129685][ T7232] ip_protocol_deliver_rcu+0x4d/0x420 [ 56.135041][ T7232] ip_local_deliver_finish+0x110/0x140 [ 56.140487][ T7232] ip_local_deliver+0x133/0x210 [ 56.145325][ T7232] ip_rcv_finish+0x121/0x160 [ 56.149896][ T7232] ip_rcv+0x18f/0x1a0 [ 56.153869][ T7232] __netif_receive_skb_one_core+0xa7/0xe0 [ 56.159698][ T7232] __netif_receive_skb+0x37/0xf0 [ 56.164897][ T7232] netif_receive_skb_internal+0x59/0x190 [ 56.170515][ T7232] napi_gro_receive+0x28f/0x330 [ 56.175351][ T7232] receive_buf+0x284/0x30b0 [ 56.179869][ T7232] virtnet_poll+0x436/0x7d0 [ 56.184360][ T7232] net_rx_action+0x3ae/0xa90 [ 56.189137][ T7232] [ 56.191458][ T7232] write to 0xffff88811eedb30c of 4 bytes by task 7232 on cpu 0: [ 56.199076][ T7232] tcp_rcv_space_adjust+0x40f/0x4c0 [ 56.204456][ T7232] tcp_recvmsg+0xdaa/0x1a30 [ 56.208952][ T7232] inet_recvmsg+0xbb/0x250 [ 56.213355][ T7232] sock_recvmsg+0x92/0xb0 [ 56.217865][ T7232] sock_read_iter+0x15f/0x1e0 [ 56.222534][ T7232] new_sync_read+0x389/0x4f0 [ 56.227148][ T7232] __vfs_read+0xb1/0xc0 [ 56.231292][ T7232] vfs_read+0x143/0x2c0 [ 56.235430][ T7232] ksys_read+0xd5/0x1b0 [ 56.239572][ T7232] __x64_sys_read+0x4c/0x60 [ 56.244067][ T7232] do_syscall_64+0xcc/0x370 [ 56.248685][ T7232] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.254589][ T7232] [ 56.256899][ T7232] Reported by Kernel Concurrency Sanitizer on: [ 56.263036][ T7232] CPU: 0 PID: 7232 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 56.270474][ T7232] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.280632][ T7232] ================================================================== [ 56.288714][ T7232] Kernel panic - not syncing: panic_on_warn set ... [ 56.295285][ T7232] CPU: 0 PID: 7232 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 56.302767][ T7232] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.312813][ T7232] Call Trace: [ 56.316100][ T7232] dump_stack+0xf5/0x159 [ 56.320338][ T7232] panic+0x210/0x640 [ 56.324226][ T7232] ? ksys_read+0xd5/0x1b0 [ 56.328546][ T7232] ? vprintk_func+0x8d/0x140 [ 56.333125][ T7232] kcsan_report.cold+0xc/0x10 [ 56.337789][ T7232] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 56.345447][ T7232] __tsan_write4+0x32/0x40 [ 56.349855][ T7232] tcp_rcv_space_adjust+0x40f/0x4c0 [ 56.355218][ T7232] tcp_recvmsg+0xdaa/0x1a30 [ 56.359738][ T7232] ? debug_smp_processor_id+0x4c/0x172 [ 56.365190][ T7232] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 56.371255][ T7232] inet_recvmsg+0xbb/0x250 [ 56.375717][ T7232] ? __tsan_read8+0x2c/0x30 [ 56.380262][ T7232] ? inet_sendpage+0x100/0x100 [ 56.385270][ T7232] sock_recvmsg+0x92/0xb0 [ 56.389598][ T7232] sock_read_iter+0x15f/0x1e0 [ 56.394267][ T7232] new_sync_read+0x389/0x4f0 [ 56.398858][ T7232] __vfs_read+0xb1/0xc0 [ 56.403015][ T7232] vfs_read+0x143/0x2c0 [ 56.407164][ T7232] ksys_read+0xd5/0x1b0 [ 56.411316][ T7232] __x64_sys_read+0x4c/0x60 [ 56.415815][ T7232] do_syscall_64+0xcc/0x370 [ 56.420371][ T7232] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.426263][ T7232] RIP: 0033:0x47c530 [ 56.430148][ T7232] 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 [ 56.449824][ T7232] RSP: 002b:000000c4203d7810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 56.458221][ T7232] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 56.466182][ T7232] RDX: 0000000000001000 RSI: 000000c4202ae000 RDI: 0000000000000003 [ 56.474140][ T7232] RBP: 000000c4203d7868 R08: 0000000000000000 R09: 0000000000000000 [ 56.482098][ T7232] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000010 [ 56.490151][ T7232] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 56.499037][ T7232] Kernel Offset: disabled [ 56.503461][ T7232] Rebooting in 86400 seconds..