[ 54.252401][ T26] audit: type=1800 audit(1572963742.584:26): pid=7886 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 54.285981][ T26] audit: type=1800 audit(1572963742.584:27): pid=7886 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [ 54.307965][ T26] audit: type=1800 audit(1572963742.594:28): pid=7886 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. [ 55.195157][ T26] audit: type=1800 audit(1572963743.564:29): pid=7886 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 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.204' (ECDSA) to the list of known hosts. 2019/11/05 14:22:30 fuzzer started 2019/11/05 14:22:32 dialing manager at 10.128.0.105:43787 2019/11/05 14:22:32 syscalls: 2553 2019/11/05 14:22:32 code coverage: enabled 2019/11/05 14:22:32 comparison tracing: enabled 2019/11/05 14:22:32 extra coverage: extra coverage is not supported by the kernel 2019/11/05 14:22:32 setuid sandbox: enabled 2019/11/05 14:22:32 namespace sandbox: enabled 2019/11/05 14:22:32 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/05 14:22:32 fault injection: enabled 2019/11/05 14:22:32 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/05 14:22:32 net packet injection: enabled 2019/11/05 14:22:32 net device setup: enabled 2019/11/05 14:22:32 concurrency sanitizer: enabled 2019/11/05 14:22:32 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/11/05 14:22:32 adding functions to KCSAN blacklist: 'tomoyo_supervisor' 'pid_update_inode' 'generic_permission' '__hrtimer_run_queues' syzkaller login: [ 64.452302][ T8042] ================================================================== [ 64.460447][ T8042] BUG: KCSAN: data-race in tcp_add_backlog / tcp_recvmsg [ 64.467446][ T8042] [ 64.469760][ T8042] write to 0xffff88812174c9f8 of 8 bytes by interrupt on cpu 0: [ 64.477376][ T8042] tcp_add_backlog+0x476/0xce0 [ 64.482209][ T8042] tcp_v4_rcv+0x1a70/0x1bd0 [ 64.486709][ T8042] ip_protocol_deliver_rcu+0x4d/0x420 [ 64.492077][ T8042] ip_local_deliver_finish+0x110/0x140 [ 64.497540][ T8042] ip_local_deliver+0x133/0x210 [ 64.502382][ T8042] ip_rcv_finish+0x121/0x160 [ 64.507001][ T8042] ip_rcv+0x18f/0x1a0 [ 64.510968][ T8042] __netif_receive_skb_one_core+0xa7/0xe0 [ 64.516670][ T8042] __netif_receive_skb+0x37/0xf0 [ 64.521616][ T8042] netif_receive_skb_internal+0x59/0x190 [ 64.527249][ T8042] napi_gro_receive+0x28f/0x330 [ 64.532096][ T8042] receive_buf+0x284/0x30b0 [ 64.536595][ T8042] virtnet_poll+0x436/0x7d0 [ 64.541080][ T8042] net_rx_action+0x3ae/0xa90 [ 64.545655][ T8042] __do_softirq+0x115/0x33f [ 64.550140][ T8042] irq_exit+0xbb/0xe0 [ 64.554126][ T8042] do_IRQ+0xa6/0x180 [ 64.558002][ T8042] ret_from_intr+0x0/0x19 [ 64.562324][ T8042] native_safe_halt+0xe/0x10 [ 64.566911][ T8042] arch_cpu_idle+0x1f/0x30 [ 64.571309][ T8042] default_idle_call+0x1e/0x40 [ 64.576063][ T8042] do_idle+0x1af/0x280 [ 64.580113][ T8042] cpu_startup_entry+0x1b/0x20 [ 64.584873][ T8042] rest_init+0xec/0xf6 [ 64.588935][ T8042] arch_call_rest_init+0x17/0x37 [ 64.593865][ T8042] start_kernel+0x838/0x85e [ 64.598362][ T8042] x86_64_start_reservations+0x29/0x2b [ 64.603803][ T8042] x86_64_start_kernel+0x72/0x76 [ 64.608721][ T8042] secondary_startup_64+0xa4/0xb0 [ 64.613727][ T8042] [ 64.616041][ T8042] read to 0xffff88812174c9f8 of 8 bytes by task 8042 on cpu 1: [ 64.623565][ T8042] tcp_recvmsg+0x46e/0x1b40 [ 64.628050][ T8042] inet_recvmsg+0xbb/0x250 [ 64.632449][ T8042] sock_recvmsg+0x92/0xb0 [ 64.636759][ T8042] sock_read_iter+0x15f/0x1e0 [ 64.641427][ T8042] new_sync_read+0x389/0x4f0 [ 64.646012][ T8042] __vfs_read+0xb1/0xc0 [ 64.650147][ T8042] vfs_read+0x143/0x2c0 [ 64.654281][ T8042] ksys_read+0xd5/0x1b0 [ 64.658421][ T8042] __x64_sys_read+0x4c/0x60 [ 64.662907][ T8042] do_syscall_64+0xcc/0x370 [ 64.667404][ T8042] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 64.673267][ T8042] [ 64.675583][ T8042] Reported by Kernel Concurrency Sanitizer on: [ 64.681769][ T8042] CPU: 1 PID: 8042 Comm: syz-fuzzer Not tainted 5.4.0-rc6+ #0 [ 64.689254][ T8042] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.699301][ T8042] ================================================================== [ 64.707348][ T8042] Kernel panic - not syncing: panic_on_warn set ... [ 64.713918][ T8042] CPU: 1 PID: 8042 Comm: syz-fuzzer Not tainted 5.4.0-rc6+ #0 [ 64.721347][ T8042] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.731378][ T8042] Call Trace: [ 64.734701][ T8042] dump_stack+0xf5/0x159 [ 64.738928][ T8042] panic+0x210/0x640 [ 64.742835][ T8042] ? vprintk_func+0x8d/0x140 [ 64.747413][ T8042] kcsan_report.cold+0xc/0xe [ 64.751988][ T8042] kcsan_setup_watchpoint+0x3fe/0x410 [ 64.757343][ T8042] __tsan_read8+0x145/0x1f0 [ 64.761837][ T8042] tcp_recvmsg+0x46e/0x1b40 [ 64.766335][ T8042] inet_recvmsg+0xbb/0x250 [ 64.770732][ T8042] ? apparmor_socket_recvmsg+0x3b/0x50 [ 64.776176][ T8042] ? security_socket_recvmsg+0x92/0xb0 [ 64.781657][ T8042] ? inet_sendpage+0x100/0x100 [ 64.786424][ T8042] sock_recvmsg+0x92/0xb0 [ 64.790761][ T8042] sock_read_iter+0x15f/0x1e0 [ 64.795433][ T8042] new_sync_read+0x389/0x4f0 [ 64.800013][ T8042] __vfs_read+0xb1/0xc0 [ 64.804154][ T8042] vfs_read+0x143/0x2c0 [ 64.808308][ T8042] ksys_read+0xd5/0x1b0 [ 64.812451][ T8042] __x64_sys_read+0x4c/0x60 [ 64.816955][ T8042] do_syscall_64+0xcc/0x370 [ 64.821455][ T8042] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 64.827333][ T8042] RIP: 0033:0x47c530 [ 64.831217][ T8042] 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 [ 64.850851][ T8042] RSP: 002b:000000c4203cf7d0 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 64.859263][ T8042] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 64.867253][ T8042] RDX: 0000000000001000 RSI: 000000c4202dc000 RDI: 0000000000000003 [ 64.875225][ T8042] RBP: 000000c4203cf828 R08: 0000000000000000 R09: 0000000000000000 [ 64.883196][ T8042] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000020 [ 64.891151][ T8042] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 64.900393][ T8042] Kernel Offset: disabled [ 64.904731][ T8042] Rebooting in 86400 seconds..