[ 58.354853][ T26] audit: type=1800 audit(1573338770.475:27): pid=7764 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [ 58.375443][ T26] audit: type=1800 audit(1573338770.475:28): pid=7764 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2450 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 59.045545][ T26] audit: type=1800 audit(1573338771.235:29): pid=7764 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2465 res=0 [ 59.066288][ T26] audit: type=1800 audit(1573338771.235:30): pid=7764 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2456 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.156' (ECDSA) to the list of known hosts. 2019/11/09 22:33:00 fuzzer started 2019/11/09 22:33:02 dialing manager at 10.128.0.105:33901 2019/11/09 22:33:02 syscalls: 2553 2019/11/09 22:33:02 code coverage: enabled 2019/11/09 22:33:02 comparison tracing: enabled 2019/11/09 22:33:02 extra coverage: extra coverage is not supported by the kernel 2019/11/09 22:33:02 setuid sandbox: enabled 2019/11/09 22:33:02 namespace sandbox: enabled 2019/11/09 22:33:02 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/09 22:33:02 fault injection: enabled 2019/11/09 22:33:02 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/09 22:33:02 net packet injection: enabled 2019/11/09 22:33:02 net device setup: enabled 2019/11/09 22:33:02 concurrency sanitizer: enabled 2019/11/09 22:33:02 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/11/09 22:33:03 adding functions to KCSAN blacklist: 'tomoyo_supervisor' 'rcu_gp_fqs_check_wake' 'tick_do_update_jiffies64' 'wbt_issue' 'run_timer_softirq' '__hrtimer_run_queues' syzkaller login: [ 71.514183][ T7928] ================================================================== [ 71.522467][ T7928] BUG: KCSAN: data-race in tcp_add_backlog / tcp_recvmsg [ 71.529492][ T7928] [ 71.531827][ T7928] write to 0xffff88812369f2f8 of 8 bytes by interrupt on cpu 0: [ 71.539470][ T7928] tcp_add_backlog+0x476/0xce0 [ 71.544234][ T7928] tcp_v4_rcv+0x1a70/0x1bd0 [ 71.548725][ T7928] ip_protocol_deliver_rcu+0x4d/0x420 [ 71.554079][ T7928] ip_local_deliver_finish+0x110/0x140 [ 71.559532][ T7928] ip_local_deliver+0x133/0x210 [ 71.564368][ T7928] ip_rcv_finish+0x121/0x160 [ 71.568942][ T7928] ip_rcv+0x18f/0x1a0 [ 71.572911][ T7928] __netif_receive_skb_one_core+0xa7/0xe0 [ 71.578614][ T7928] __netif_receive_skb+0x37/0xf0 [ 71.583540][ T7928] netif_receive_skb_internal+0x59/0x190 [ 71.589241][ T7928] napi_gro_receive+0x28f/0x330 [ 71.594101][ T7928] receive_buf+0x284/0x30b0 [ 71.598586][ T7928] virtnet_poll+0x436/0x7d0 [ 71.603072][ T7928] net_rx_action+0x3ae/0xa90 [ 71.607646][ T7928] __do_softirq+0x115/0x33f [ 71.612131][ T7928] run_ksoftirqd+0x46/0x60 [ 71.616535][ T7928] smpboot_thread_fn+0x37d/0x4a0 [ 71.621468][ T7928] kthread+0x1d4/0x200 [ 71.625523][ T7928] ret_from_fork+0x1f/0x30 [ 71.629918][ T7928] [ 71.632230][ T7928] read to 0xffff88812369f2f8 of 8 bytes by task 7928 on cpu 1: [ 71.639750][ T7928] tcp_recvmsg+0x46e/0x1b40 [ 71.644231][ T7928] inet_recvmsg+0xbb/0x250 [ 71.648631][ T7928] sock_recvmsg+0x92/0xb0 [ 71.652941][ T7928] sock_read_iter+0x15f/0x1e0 [ 71.657610][ T7928] new_sync_read+0x389/0x4f0 [ 71.662181][ T7928] __vfs_read+0xb1/0xc0 [ 71.666316][ T7928] vfs_read+0x143/0x2c0 [ 71.670465][ T7928] ksys_read+0xd5/0x1b0 [ 71.674612][ T7928] __x64_sys_read+0x4c/0x60 [ 71.679097][ T7928] do_syscall_64+0xcc/0x370 [ 71.683582][ T7928] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 71.689444][ T7928] [ 71.691749][ T7928] Reported by Kernel Concurrency Sanitizer on: [ 71.697884][ T7928] CPU: 1 PID: 7928 Comm: syz-fuzzer Not tainted 5.4.0-rc6+ #0 [ 71.705314][ T7928] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 71.715358][ T7928] ================================================================== [ 71.723413][ T7928] Kernel panic - not syncing: panic_on_warn set ... [ 71.729980][ T7928] CPU: 1 PID: 7928 Comm: syz-fuzzer Not tainted 5.4.0-rc6+ #0 [ 71.737410][ T7928] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 71.747442][ T7928] Call Trace: [ 71.750719][ T7928] dump_stack+0xf5/0x159 [ 71.754943][ T7928] panic+0x210/0x640 [ 71.758835][ T7928] ? vprintk_func+0x8d/0x140 [ 71.763410][ T7928] kcsan_report.cold+0xc/0xe [ 71.767988][ T7928] kcsan_setup_watchpoint+0x3fe/0x410 [ 71.773342][ T7928] __tsan_read8+0x145/0x1f0 [ 71.777833][ T7928] tcp_recvmsg+0x46e/0x1b40 [ 71.782331][ T7928] inet_recvmsg+0xbb/0x250 [ 71.786729][ T7928] ? apparmor_socket_recvmsg+0x3b/0x50 [ 71.792174][ T7928] ? security_socket_recvmsg+0x92/0xb0 [ 71.797615][ T7928] ? inet_sendpage+0x100/0x100 [ 71.802363][ T7928] sock_recvmsg+0x92/0xb0 [ 71.806676][ T7928] sock_read_iter+0x15f/0x1e0 [ 71.811415][ T7928] new_sync_read+0x389/0x4f0 [ 71.816009][ T7928] __vfs_read+0xb1/0xc0 [ 71.820149][ T7928] vfs_read+0x143/0x2c0 [ 71.824319][ T7928] ksys_read+0xd5/0x1b0 [ 71.828463][ T7928] __x64_sys_read+0x4c/0x60 [ 71.832960][ T7928] do_syscall_64+0xcc/0x370 [ 71.837455][ T7928] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 71.843332][ T7928] RIP: 0033:0x47c530 [ 71.847217][ T7928] 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 [ 71.866846][ T7928] RSP: 002b:000000c4202ab7d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 71.875240][ T7928] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 71.883197][ T7928] RDX: 0000000000001000 RSI: 000000c42032c000 RDI: 0000000000000003 [ 71.891189][ T7928] RBP: 000000c4202ab830 R08: 0000000000000000 R09: 0000000000000000 [ 71.899154][ T7928] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000010 [ 71.907147][ T7928] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 71.916591][ T7928] Kernel Offset: disabled [ 71.920915][ T7928] Rebooting in 86400 seconds..