[ 53.950682][ T26] audit: type=1800 audit(1573196884.352:26): pid=7835 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 53.991939][ T26] audit: type=1800 audit(1573196884.352:27): pid=7835 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [ 54.017984][ T26] audit: type=1800 audit(1573196884.362:28): pid=7835 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. [ 54.813251][ T26] audit: type=1800 audit(1573196885.252:29): pid=7835 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 '10.128.0.228' (ECDSA) to the list of known hosts. 2019/11/08 07:08:11 fuzzer started 2019/11/08 07:08:13 dialing manager at 10.128.0.105:41185 2019/11/08 07:08:13 syscalls: 2553 2019/11/08 07:08:13 code coverage: enabled 2019/11/08 07:08:13 comparison tracing: enabled 2019/11/08 07:08:13 extra coverage: extra coverage is not supported by the kernel 2019/11/08 07:08:13 setuid sandbox: enabled 2019/11/08 07:08:13 namespace sandbox: enabled 2019/11/08 07:08:13 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/08 07:08:13 fault injection: enabled 2019/11/08 07:08:13 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/08 07:08:13 net packet injection: enabled 2019/11/08 07:08:13 net device setup: enabled 2019/11/08 07:08:13 concurrency sanitizer: enabled 2019/11/08 07:08:13 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/11/08 07:08:14 adding functions to KCSAN blacklist: 'generic_permission' '__hrtimer_run_queues' 'tomoyo_supervisor' 'run_timer_softirq' 'do_nanosleep' syzkaller login: [ 64.238557][ T8005] ================================================================== [ 64.246687][ T8005] BUG: KCSAN: data-race in tcp_add_backlog / tcp_recvmsg [ 64.253729][ T8005] [ 64.256043][ T8005] write to 0xffff888122bd4178 of 8 bytes by interrupt on cpu 0: [ 64.263874][ T8005] tcp_add_backlog+0x476/0xce0 [ 64.268619][ T8005] tcp_v4_rcv+0x1a70/0x1bd0 [ 64.273105][ T8005] ip_protocol_deliver_rcu+0x4d/0x420 [ 64.278458][ T8005] ip_local_deliver_finish+0x110/0x140 [ 64.283897][ T8005] ip_local_deliver+0x133/0x210 [ 64.288727][ T8005] ip_rcv_finish+0x121/0x160 [ 64.293298][ T8005] ip_rcv+0x18f/0x1a0 [ 64.297268][ T8005] __netif_receive_skb_one_core+0xa7/0xe0 [ 64.302965][ T8005] __netif_receive_skb+0x37/0xf0 [ 64.307886][ T8005] netif_receive_skb_internal+0x59/0x190 [ 64.313495][ T8005] napi_gro_receive+0x28f/0x330 [ 64.318326][ T8005] receive_buf+0x284/0x30b0 [ 64.322805][ T8005] virtnet_poll+0x436/0x7d0 [ 64.327287][ T8005] net_rx_action+0x3ae/0xa90 [ 64.331862][ T8005] __do_softirq+0x115/0x33f [ 64.336344][ T8005] irq_exit+0xbb/0xe0 [ 64.340311][ T8005] do_IRQ+0xa6/0x180 [ 64.344187][ T8005] ret_from_intr+0x0/0x19 [ 64.348494][ T8005] native_safe_halt+0xe/0x10 [ 64.353067][ T8005] arch_cpu_idle+0x1f/0x30 [ 64.357464][ T8005] default_idle_call+0x1e/0x40 [ 64.362236][ T8005] do_idle+0x1af/0x280 [ 64.366315][ T8005] cpu_startup_entry+0x1b/0x20 [ 64.371059][ T8005] rest_init+0xec/0xf6 [ 64.375112][ T8005] arch_call_rest_init+0x17/0x37 [ 64.380032][ T8005] start_kernel+0x838/0x85e [ 64.384515][ T8005] x86_64_start_reservations+0x29/0x2b [ 64.389955][ T8005] x86_64_start_kernel+0x72/0x76 [ 64.395054][ T8005] secondary_startup_64+0xa4/0xb0 [ 64.400050][ T8005] [ 64.402361][ T8005] read to 0xffff888122bd4178 of 8 bytes by task 8005 on cpu 1: [ 64.409884][ T8005] tcp_recvmsg+0x46e/0x1b40 [ 64.414367][ T8005] inet_recvmsg+0xbb/0x250 [ 64.418776][ T8005] sock_recvmsg+0x92/0xb0 [ 64.423145][ T8005] sock_read_iter+0x15f/0x1e0 [ 64.427865][ T8005] new_sync_read+0x389/0x4f0 [ 64.432452][ T8005] __vfs_read+0xb1/0xc0 [ 64.436591][ T8005] vfs_read+0x143/0x2c0 [ 64.440731][ T8005] ksys_read+0xd5/0x1b0 [ 64.444917][ T8005] __x64_sys_read+0x4c/0x60 [ 64.449411][ T8005] do_syscall_64+0xcc/0x370 [ 64.453904][ T8005] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 64.459771][ T8005] [ 64.462075][ T8005] Reported by Kernel Concurrency Sanitizer on: [ 64.468210][ T8005] CPU: 1 PID: 8005 Comm: syz-fuzzer Not tainted 5.4.0-rc6+ #0 [ 64.475639][ T8005] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.485675][ T8005] ================================================================== [ 64.493722][ T8005] Kernel panic - not syncing: panic_on_warn set ... [ 64.500291][ T8005] CPU: 1 PID: 8005 Comm: syz-fuzzer Not tainted 5.4.0-rc6+ #0 [ 64.507721][ T8005] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.517754][ T8005] Call Trace: [ 64.521034][ T8005] dump_stack+0xf5/0x159 [ 64.525258][ T8005] panic+0x210/0x640 [ 64.529140][ T8005] ? vprintk_func+0x8d/0x140 [ 64.533716][ T8005] kcsan_report.cold+0xc/0xe [ 64.538302][ T8005] kcsan_setup_watchpoint+0x3fe/0x410 [ 64.543656][ T8005] __tsan_read8+0x145/0x1f0 [ 64.548140][ T8005] tcp_recvmsg+0x46e/0x1b40 [ 64.552649][ T8005] inet_recvmsg+0xbb/0x250 [ 64.557072][ T8005] ? apparmor_socket_recvmsg+0x3b/0x50 [ 64.562515][ T8005] ? security_socket_recvmsg+0x92/0xb0 [ 64.567961][ T8005] ? inet_sendpage+0x100/0x100 [ 64.572711][ T8005] sock_recvmsg+0x92/0xb0 [ 64.577026][ T8005] sock_read_iter+0x15f/0x1e0 [ 64.581708][ T8005] new_sync_read+0x389/0x4f0 [ 64.586289][ T8005] __vfs_read+0xb1/0xc0 [ 64.590432][ T8005] vfs_read+0x143/0x2c0 [ 64.594583][ T8005] ksys_read+0xd5/0x1b0 [ 64.598724][ T8005] __x64_sys_read+0x4c/0x60 [ 64.603219][ T8005] do_syscall_64+0xcc/0x370 [ 64.607709][ T8005] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 64.613593][ T8005] RIP: 0033:0x47c530 [ 64.617480][ T8005] 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 [ 64.637112][ T8005] RSP: 002b:000000c4202f5810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 64.645517][ T8005] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 64.653477][ T8005] RDX: 0000000000001000 RSI: 000000c420318000 RDI: 0000000000000003 [ 64.661431][ T8005] RBP: 000000c4202f5868 R08: 0000000000000000 R09: 0000000000000000 [ 64.669391][ T8005] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000100 [ 64.677351][ T8005] R13: ffffffffffffffff R14: 0000000000000040 R15: ffffffffffffffff [ 64.686703][ T8005] Kernel Offset: disabled [ 64.691028][ T8005] Rebooting in 86400 seconds..