[info] Using makefile-style concurrent boot in runlevel 2. [ 41.889559][ T26] audit: type=1800 audit(1576073349.729:21): pid=7459 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 41.930958][ T26] audit: type=1800 audit(1576073349.729:22): pid=7459 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.129' (ECDSA) to the list of known hosts. 2019/12/11 14:09:21 fuzzer started 2019/12/11 14:09:22 dialing manager at 10.128.0.105:44805 2019/12/11 14:09:23 syscalls: 2689 2019/12/11 14:09:23 code coverage: enabled 2019/12/11 14:09:23 comparison tracing: enabled 2019/12/11 14:09:23 extra coverage: extra coverage is not supported by the kernel 2019/12/11 14:09:23 setuid sandbox: enabled 2019/12/11 14:09:23 namespace sandbox: enabled 2019/12/11 14:09:23 Android sandbox: /sys/fs/selinux/policy does not exist 2019/12/11 14:09:23 fault injection: enabled 2019/12/11 14:09:23 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/12/11 14:09:23 net packet injection: enabled 2019/12/11 14:09:23 net device setup: enabled 2019/12/11 14:09:23 concurrency sanitizer: enabled 2019/12/11 14:09:23 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/12/11 14:09:23 adding functions to KCSAN blacklist: '__hrtimer_run_queues' 'tomoyo_supervisor' syzkaller login: [ 55.602361][ T7618] ================================================================== [ 55.610504][ T7618] BUG: KCSAN: data-race in tcp_add_backlog / tcp_recvmsg [ 55.617653][ T7618] [ 55.620093][ T7618] write to 0xffff88812583e9f8 of 8 bytes by interrupt on cpu 1: [ 55.627718][ T7618] tcp_add_backlog+0x476/0xce0 [ 55.632473][ T7618] tcp_v4_rcv+0x1a70/0x1bd0 [ 55.636963][ T7618] ip_protocol_deliver_rcu+0x4d/0x420 [ 55.642338][ T7618] ip_local_deliver_finish+0x110/0x140 [ 55.647877][ T7618] ip_local_deliver+0x133/0x210 [ 55.652717][ T7618] ip_rcv_finish+0x121/0x160 [ 55.657591][ T7618] ip_rcv+0x18f/0x1a0 [ 55.661561][ T7618] __netif_receive_skb_one_core+0xa7/0xe0 [ 55.667495][ T7618] __netif_receive_skb+0x37/0xf0 [ 55.672506][ T7618] netif_receive_skb_internal+0x59/0x190 [ 55.678240][ T7618] napi_gro_receive+0x28f/0x330 [ 55.683170][ T7618] receive_buf+0x284/0x30b0 [ 55.687803][ T7618] virtnet_poll+0x436/0x7d0 [ 55.692293][ T7618] net_rx_action+0x3ae/0xa90 [ 55.696873][ T7618] __do_softirq+0x115/0x33f [ 55.701369][ T7618] irq_exit+0xbb/0xe0 [ 55.705372][ T7618] do_IRQ+0x81/0x130 [ 55.709443][ T7618] ret_from_intr+0x0/0x19 [ 55.713770][ T7618] native_safe_halt+0xe/0x10 [ 55.718360][ T7618] arch_cpu_idle+0xa/0x10 [ 55.722690][ T7618] default_idle_call+0x1e/0x40 [ 55.727553][ T7618] do_idle+0x1af/0x280 [ 55.731672][ T7618] cpu_startup_entry+0x1b/0x20 [ 55.736435][ T7618] start_secondary+0x168/0x1b0 [ 55.741385][ T7618] secondary_startup_64+0xa4/0xb0 [ 55.746578][ T7618] [ 55.748936][ T7618] read to 0xffff88812583e9f8 of 8 bytes by task 7618 on cpu 0: [ 55.756565][ T7618] tcp_recvmsg+0x46e/0x1b40 [ 55.761156][ T7618] inet_recvmsg+0xbb/0x250 [ 55.765739][ T7618] sock_recvmsg+0x92/0xb0 [ 55.770058][ T7618] sock_read_iter+0x15f/0x1e0 [ 55.774727][ T7618] new_sync_read+0x389/0x4f0 [ 55.779347][ T7618] __vfs_read+0xb1/0xc0 [ 55.783500][ T7618] vfs_read+0x143/0x2c0 [ 55.787640][ T7618] ksys_read+0xd5/0x1b0 [ 55.791866][ T7618] __x64_sys_read+0x4c/0x60 [ 55.796484][ T7618] do_syscall_64+0xcc/0x370 [ 55.800977][ T7618] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 55.806961][ T7618] [ 55.809326][ T7618] Reported by Kernel Concurrency Sanitizer on: [ 55.815668][ T7618] CPU: 0 PID: 7618 Comm: syz-fuzzer Not tainted 5.4.0-syzkaller #0 [ 55.824004][ T7618] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.834142][ T7618] ================================================================== [ 55.842190][ T7618] Kernel panic - not syncing: panic_on_warn set ... [ 55.848769][ T7618] CPU: 0 PID: 7618 Comm: syz-fuzzer Not tainted 5.4.0-syzkaller #0 [ 55.856640][ T7618] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.866682][ T7618] Call Trace: [ 55.870061][ T7618] dump_stack+0x11d/0x181 [ 55.874380][ T7618] panic+0x210/0x640 [ 55.878489][ T7618] ? vprintk_func+0x8d/0x140 [ 55.883076][ T7618] kcsan_report.cold+0xc/0xd [ 55.887661][ T7618] kcsan_setup_watchpoint+0x3fe/0x460 [ 55.893027][ T7618] __tsan_read8+0xc6/0x100 [ 55.897434][ T7618] tcp_recvmsg+0x46e/0x1b40 [ 55.901941][ T7618] inet_recvmsg+0xbb/0x250 [ 55.906450][ T7618] ? apparmor_socket_recvmsg+0x3b/0x50 [ 55.911906][ T7618] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 55.918139][ T7618] ? security_socket_recvmsg+0x92/0xb0 [ 55.923748][ T7618] ? inet_sendpage+0x100/0x100 [ 55.928508][ T7618] sock_recvmsg+0x92/0xb0 [ 55.932954][ T7618] sock_read_iter+0x15f/0x1e0 [ 55.937750][ T7618] new_sync_read+0x389/0x4f0 [ 55.942339][ T7618] __vfs_read+0xb1/0xc0 [ 55.946488][ T7618] vfs_read+0x143/0x2c0 [ 55.950632][ T7618] ksys_read+0xd5/0x1b0 [ 55.954920][ T7618] __x64_sys_read+0x4c/0x60 [ 55.959498][ T7618] do_syscall_64+0xcc/0x370 [ 55.964092][ T7618] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 55.969973][ T7618] RIP: 0033:0x47c530 [ 55.973859][ T7618] 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 [ 55.993607][ T7618] RSP: 002b:000000c42014d7d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 56.002115][ T7618] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 56.010076][ T7618] RDX: 0000000000001000 RSI: 000000c420316000 RDI: 0000000000000003 [ 56.018038][ T7618] RBP: 000000c42014d830 R08: 0000000000000000 R09: 0000000000000000 [ 56.026152][ T7618] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000004 [ 56.034155][ T7618] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 56.043781][ T7618] Kernel Offset: disabled [ 56.048127][ T7618] Rebooting in 86400 seconds..