[ 53.258683][ T26] audit: type=1800 audit(1573138469.282:27): pid=7837 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [ 53.280560][ T26] audit: type=1800 audit(1573138469.282:28): pid=7837 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. [ 54.179137][ T26] audit: type=1800 audit(1573138470.272:29): pid=7837 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 [ 54.199494][ T26] audit: type=1800 audit(1573138470.272:30): pid=7837 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 '10.128.10.42' (ECDSA) to the list of known hosts. 2019/11/07 14:54:39 fuzzer started 2019/11/07 14:54:41 dialing manager at 10.128.0.105:36923 2019/11/07 14:54:41 syscalls: 2553 2019/11/07 14:54:41 code coverage: enabled 2019/11/07 14:54:41 comparison tracing: enabled 2019/11/07 14:54:41 extra coverage: extra coverage is not supported by the kernel 2019/11/07 14:54:41 setuid sandbox: enabled 2019/11/07 14:54:41 namespace sandbox: enabled 2019/11/07 14:54:41 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/07 14:54:41 fault injection: enabled 2019/11/07 14:54:41 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/07 14:54:41 net packet injection: enabled 2019/11/07 14:54:41 net device setup: enabled 2019/11/07 14:54:41 concurrency sanitizer: enabled 2019/11/07 14:54:41 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/11/07 14:54:41 adding functions to KCSAN blacklist: '__splice_from_pipe' '__hrtimer_run_queues' 'run_timer_softirq' 'tomoyo_supervisor' 'generic_permission' 'find_next_bit' 'ktime_get_real_seconds' syzkaller login: [ 66.531780][ T8000] ================================================================== [ 66.540163][ T8000] BUG: KCSAN: data-race in tcp_add_backlog / tcp_recvmsg [ 66.547172][ T8000] [ 66.549497][ T8000] write to 0xffff888123cd32f8 of 8 bytes by interrupt on cpu 0: [ 66.557231][ T8000] tcp_add_backlog+0x476/0xce0 [ 66.561986][ T8000] tcp_v4_rcv+0x1a70/0x1bd0 [ 66.566481][ T8000] ip_protocol_deliver_rcu+0x4d/0x420 [ 66.571849][ T8000] ip_local_deliver_finish+0x110/0x140 [ 66.577302][ T8000] ip_local_deliver+0x133/0x210 [ 66.582474][ T8000] ip_rcv_finish+0x121/0x160 [ 66.587065][ T8000] ip_rcv+0x18f/0x1a0 [ 66.591186][ T8000] __netif_receive_skb_one_core+0xa7/0xe0 [ 66.596999][ T8000] __netif_receive_skb+0x37/0xf0 [ 66.602012][ T8000] netif_receive_skb_internal+0x59/0x190 [ 66.607758][ T8000] napi_gro_receive+0x28f/0x330 [ 66.612610][ T8000] receive_buf+0x284/0x30b0 [ 66.617326][ T8000] virtnet_poll+0x436/0x7d0 [ 66.621942][ T8000] net_rx_action+0x3ae/0xa90 [ 66.626661][ T8000] __do_softirq+0x115/0x33f [ 66.631303][ T8000] irq_exit+0xbb/0xe0 [ 66.635277][ T8000] do_IRQ+0xa6/0x180 [ 66.639282][ T8000] ret_from_intr+0x0/0x19 [ 66.643678][ T8000] native_safe_halt+0xe/0x10 [ 66.648267][ T8000] arch_cpu_idle+0x1f/0x30 [ 66.652674][ T8000] default_idle_call+0x1e/0x40 [ 66.657434][ T8000] do_idle+0x1af/0x280 [ 66.661494][ T8000] cpu_startup_entry+0x1b/0x20 [ 66.666252][ T8000] rest_init+0xec/0xf6 [ 66.670454][ T8000] arch_call_rest_init+0x17/0x37 [ 66.675444][ T8000] start_kernel+0x838/0x85e [ 66.680000][ T8000] x86_64_start_reservations+0x29/0x2b [ 66.685515][ T8000] x86_64_start_kernel+0x72/0x76 [ 66.690609][ T8000] secondary_startup_64+0xa4/0xb0 [ 66.695616][ T8000] [ 66.697941][ T8000] read to 0xffff888123cd32f8 of 8 bytes by task 8000 on cpu 1: [ 66.705482][ T8000] tcp_recvmsg+0x46e/0x1b40 [ 66.710008][ T8000] inet_recvmsg+0xbb/0x250 [ 66.714701][ T8000] sock_recvmsg+0x92/0xb0 [ 66.719029][ T8000] sock_read_iter+0x15f/0x1e0 [ 66.723697][ T8000] new_sync_read+0x389/0x4f0 [ 66.728283][ T8000] __vfs_read+0xb1/0xc0 [ 66.732431][ T8000] vfs_read+0x143/0x2c0 [ 66.736598][ T8000] ksys_read+0xd5/0x1b0 [ 66.740864][ T8000] __x64_sys_read+0x4c/0x60 [ 66.745595][ T8000] do_syscall_64+0xcc/0x370 [ 66.750199][ T8000] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.756078][ T8000] [ 66.758394][ T8000] Reported by Kernel Concurrency Sanitizer on: [ 66.764715][ T8000] CPU: 1 PID: 8000 Comm: syz-fuzzer Not tainted 5.4.0-rc6+ #0 [ 66.772162][ T8000] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.782514][ T8000] ================================================================== [ 66.790577][ T8000] Kernel panic - not syncing: panic_on_warn set ... [ 66.797418][ T8000] CPU: 1 PID: 8000 Comm: syz-fuzzer Not tainted 5.4.0-rc6+ #0 [ 66.804921][ T8000] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.815310][ T8000] Call Trace: [ 66.818605][ T8000] dump_stack+0xf5/0x159 [ 66.822843][ T8000] panic+0x210/0x640 [ 66.826848][ T8000] ? vprintk_func+0x8d/0x140 [ 66.831439][ T8000] kcsan_report.cold+0xc/0xe [ 66.836244][ T8000] kcsan_setup_watchpoint+0x3fe/0x410 [ 66.841787][ T8000] __tsan_read8+0x145/0x1f0 [ 66.846285][ T8000] tcp_recvmsg+0x46e/0x1b40 [ 66.850918][ T8000] inet_recvmsg+0xbb/0x250 [ 66.855414][ T8000] ? apparmor_socket_recvmsg+0x3b/0x50 [ 66.860987][ T8000] ? security_socket_recvmsg+0x92/0xb0 [ 66.866592][ T8000] ? inet_sendpage+0x100/0x100 [ 66.871441][ T8000] sock_recvmsg+0x92/0xb0 [ 66.875868][ T8000] sock_read_iter+0x15f/0x1e0 [ 66.880546][ T8000] new_sync_read+0x389/0x4f0 [ 66.885136][ T8000] __vfs_read+0xb1/0xc0 [ 66.889293][ T8000] vfs_read+0x143/0x2c0 [ 66.893448][ T8000] ksys_read+0xd5/0x1b0 [ 66.897599][ T8000] __x64_sys_read+0x4c/0x60 [ 66.902216][ T8000] do_syscall_64+0xcc/0x370 [ 66.906729][ T8000] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.912651][ T8000] RIP: 0033:0x47c530 [ 66.916542][ T8000] 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 [ 66.936476][ T8000] RSP: 002b:000000c42030d7d0 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 66.944879][ T8000] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 66.952846][ T8000] RDX: 0000000000001000 RSI: 000000c420318000 RDI: 0000000000000003 [ 66.960812][ T8000] RBP: 000000c42030d828 R08: 0000000000000000 R09: 0000000000000000 [ 66.968928][ T8000] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000010 [ 66.976994][ T8000] R13: ffffffffffffffff R14: 0000000000000008 R15: ffffffffffffffff [ 66.986608][ T8000] Kernel Offset: disabled [ 66.990947][ T8000] Rebooting in 86400 seconds..