[ 53.740927][ T25] audit: type=1800 audit(1573487775.145:30): pid=7757 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 '10.128.0.133' (ECDSA) to the list of known hosts. 2019/11/11 15:56:25 fuzzer started 2019/11/11 15:56:26 dialing manager at 10.128.0.105:44241 2019/11/11 15:56:26 syscalls: 2566 2019/11/11 15:56:26 code coverage: enabled 2019/11/11 15:56:26 comparison tracing: enabled 2019/11/11 15:56:26 extra coverage: extra coverage is not supported by the kernel 2019/11/11 15:56:26 setuid sandbox: enabled 2019/11/11 15:56:26 namespace sandbox: enabled 2019/11/11 15:56:26 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/11 15:56:26 fault injection: enabled 2019/11/11 15:56:26 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/11 15:56:26 net packet injection: enabled 2019/11/11 15:56:26 net device setup: enabled 2019/11/11 15:56:26 concurrency sanitizer: enabled 2019/11/11 15:56:26 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/11/11 15:56:27 adding functions to KCSAN blacklist: 'tomoyo_supervisor' 'pid_update_inode' '__hrtimer_run_queues' 'tick_do_update_jiffies64' syzkaller login: [ 65.955782][ T7910] ================================================================== [ 65.963924][ T7910] BUG: KCSAN: data-race in tcp_add_backlog / tcp_recvmsg [ 65.970920][ T7910] [ 65.973233][ T7910] write to 0xffff888126a3e9f8 of 8 bytes by interrupt on cpu 1: [ 65.980849][ T7910] tcp_add_backlog+0x476/0xce0 [ 65.985643][ T7910] tcp_v4_rcv+0x1a70/0x1bd0 [ 65.990165][ T7910] ip_protocol_deliver_rcu+0x4d/0x420 [ 65.995534][ T7910] ip_local_deliver_finish+0x110/0x140 [ 66.000978][ T7910] ip_local_deliver+0x133/0x210 [ 66.005812][ T7910] ip_rcv_finish+0x121/0x160 [ 66.010385][ T7910] ip_rcv+0x18f/0x1a0 [ 66.014364][ T7910] __netif_receive_skb_one_core+0xa7/0xe0 [ 66.020071][ T7910] __netif_receive_skb+0x37/0xf0 [ 66.024996][ T7910] netif_receive_skb_internal+0x59/0x190 [ 66.030722][ T7910] napi_gro_receive+0x28f/0x330 [ 66.035575][ T7910] receive_buf+0x284/0x30b0 [ 66.040066][ T7910] virtnet_poll+0x436/0x7d0 [ 66.044597][ T7910] net_rx_action+0x3ae/0xa90 [ 66.049174][ T7910] __do_softirq+0x115/0x33f [ 66.053660][ T7910] irq_exit+0xbb/0xe0 [ 66.057651][ T7910] do_IRQ+0xa6/0x180 [ 66.061533][ T7910] ret_from_intr+0x0/0x19 [ 66.065848][ T7910] native_safe_halt+0xe/0x10 [ 66.070492][ T7910] arch_cpu_idle+0x1f/0x30 [ 66.074897][ T7910] default_idle_call+0x1e/0x40 [ 66.079716][ T7910] do_idle+0x1af/0x280 [ 66.083776][ T7910] cpu_startup_entry+0x1b/0x20 [ 66.088525][ T7910] start_secondary+0x208/0x260 [ 66.093275][ T7910] secondary_startup_64+0xa4/0xb0 [ 66.098272][ T7910] [ 66.100589][ T7910] read to 0xffff888126a3e9f8 of 8 bytes by task 7910 on cpu 0: [ 66.108118][ T7910] tcp_recvmsg+0x46e/0x1b40 [ 66.112606][ T7910] inet_recvmsg+0xbb/0x250 [ 66.117006][ T7910] sock_recvmsg+0x92/0xb0 [ 66.121327][ T7910] sock_read_iter+0x15f/0x1e0 [ 66.125996][ T7910] new_sync_read+0x389/0x4f0 [ 66.130577][ T7910] __vfs_read+0xb1/0xc0 [ 66.134715][ T7910] vfs_read+0x143/0x2c0 [ 66.138851][ T7910] ksys_read+0xd5/0x1b0 [ 66.142989][ T7910] __x64_sys_read+0x4c/0x60 [ 66.147475][ T7910] do_syscall_64+0xcc/0x370 [ 66.151978][ T7910] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.157855][ T7910] [ 66.160158][ T7910] Reported by Kernel Concurrency Sanitizer on: [ 66.166415][ T7910] CPU: 0 PID: 7910 Comm: syz-fuzzer Not tainted 5.4.0-rc6+ #0 [ 66.173849][ T7910] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.183884][ T7910] ================================================================== [ 66.192028][ T7910] Kernel panic - not syncing: panic_on_warn set ... [ 66.198600][ T7910] CPU: 0 PID: 7910 Comm: syz-fuzzer Not tainted 5.4.0-rc6+ #0 [ 66.206031][ T7910] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.216065][ T7910] Call Trace: [ 66.219346][ T7910] dump_stack+0xf5/0x159 [ 66.223576][ T7910] panic+0x210/0x640 [ 66.227460][ T7910] ? vprintk_func+0x8d/0x140 [ 66.232051][ T7910] kcsan_report.cold+0xc/0xe [ 66.236631][ T7910] kcsan_setup_watchpoint+0x3fe/0x410 [ 66.241989][ T7910] __tsan_read8+0x145/0x1f0 [ 66.246478][ T7910] tcp_recvmsg+0x46e/0x1b40 [ 66.250977][ T7910] inet_recvmsg+0xbb/0x250 [ 66.255380][ T7910] ? apparmor_socket_recvmsg+0x3b/0x50 [ 66.260839][ T7910] ? security_socket_recvmsg+0x92/0xb0 [ 66.266281][ T7910] ? inet_sendpage+0x100/0x100 [ 66.271033][ T7910] sock_recvmsg+0x92/0xb0 [ 66.275348][ T7910] sock_read_iter+0x15f/0x1e0 [ 66.280021][ T7910] new_sync_read+0x389/0x4f0 [ 66.284621][ T7910] __vfs_read+0xb1/0xc0 [ 66.288764][ T7910] vfs_read+0x143/0x2c0 [ 66.292909][ T7910] ksys_read+0xd5/0x1b0 [ 66.297051][ T7910] __x64_sys_read+0x4c/0x60 [ 66.301542][ T7910] do_syscall_64+0xcc/0x370 [ 66.306038][ T7910] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.311917][ T7910] RIP: 0033:0x47c530 [ 66.315833][ T7910] 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 [ 66.335421][ T7910] RSP: 002b:000000c42039b8b8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 66.343823][ T7910] RAX: ffffffffffffffda RBX: 000000c420040c00 RCX: 000000000047c530 [ 66.351777][ T7910] RDX: 0000000000001000 RSI: 000000c420370000 RDI: 0000000000000003 [ 66.359734][ T7910] RBP: 000000c42039b910 R08: 0000000000000000 R09: 0000000000000000 [ 66.367687][ T7910] R10: 0000000000000000 R11: 0000000000000212 R12: 000000c42051a518 [ 66.375640][ T7910] R13: 000000000000000f R14: 0000000000c1dc00 R15: 00000000000004e1 [ 66.385119][ T7910] Kernel Offset: disabled [ 66.389444][ T7910] Rebooting in 86400 seconds..