[?25l[?1c7[ ok 8[?25h[?0c. [ 36.058897][ T26] audit: type=1800 audit(1571902932.401:25): pid=6999 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.078632][ T26] audit: type=1800 audit(1571902932.401:26): pid=6999 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.100585][ T26] audit: type=1800 audit(1571902932.401:27): pid=6999 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 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. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.1.56' (ECDSA) to the list of known hosts. 2019/10/24 07:42:20 fuzzer started 2019/10/24 07:42:21 dialing manager at 10.128.0.105:42135 2019/10/24 07:42:21 syscalls: 2524 2019/10/24 07:42:21 code coverage: enabled 2019/10/24 07:42:21 comparison tracing: enabled 2019/10/24 07:42:21 extra coverage: extra coverage is not supported by the kernel 2019/10/24 07:42:21 setuid sandbox: enabled 2019/10/24 07:42:21 namespace sandbox: enabled 2019/10/24 07:42:21 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/24 07:42:21 fault injection: enabled 2019/10/24 07:42:21 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/24 07:42:21 net packet injection: enabled 2019/10/24 07:42:21 net device setup: enabled 2019/10/24 07:42:21 concurrency sanitizer: enabled 2019/10/24 07:42:22 adding functions to KCSAN blacklist: '__hrtimer_run_queues' 'tick_sched_do_timer' 'tick_do_update_jiffies64' 'ep_poll' '__tcp_select_window' syzkaller login: [ 46.785207][ T7169] ================================================================== [ 46.793351][ T7169] BUG: KCSAN: data-race in tcp_poll / tcp_queue_rcv [ 46.799909][ T7169] [ 46.802218][ T7169] write to 0xffff888121b245b8 of 4 bytes by interrupt on cpu 0: [ 46.809843][ T7169] tcp_queue_rcv+0xe9/0x380 [ 46.814334][ T7169] tcp_rcv_established+0xbf1/0xf50 [ 46.819434][ T7169] tcp_v4_do_rcv+0x381/0x4e0 [ 46.824008][ T7169] tcp_v4_rcv+0x19dc/0x1bb0 [ 46.828540][ T7169] ip_protocol_deliver_rcu+0x4d/0x420 [ 46.833943][ T7169] ip_local_deliver_finish+0x110/0x140 [ 46.839402][ T7169] ip_local_deliver+0x133/0x210 [ 46.844308][ T7169] ip_rcv_finish+0x121/0x160 [ 46.848886][ T7169] ip_rcv+0x18f/0x1a0 [ 46.852856][ T7169] __netif_receive_skb_one_core+0xa7/0xe0 [ 46.858558][ T7169] __netif_receive_skb+0x37/0xf0 [ 46.863483][ T7169] netif_receive_skb_internal+0x59/0x190 [ 46.869130][ T7169] napi_gro_receive+0x28f/0x330 [ 46.874000][ T7169] receive_buf+0x284/0x30b0 [ 46.878474][ T7169] [ 46.880780][ T7169] read to 0xffff888121b245b8 of 4 bytes by task 7169 on cpu 1: [ 46.888357][ T7169] tcp_poll+0x204/0x6b0 [ 46.892491][ T7169] sock_poll+0xed/0x250 [ 46.896628][ T7169] ep_item_poll.isra.0+0x90/0x190 [ 46.901629][ T7169] ep_send_events_proc+0x113/0x590 [ 46.906720][ T7169] ep_scan_ready_list.constprop.0+0x189/0x500 [ 46.912885][ T7169] ep_poll+0xe3/0x900 [ 46.916843][ T7169] do_epoll_wait+0x162/0x180 [ 46.921421][ T7169] __x64_sys_epoll_pwait+0xcd/0x180 [ 46.926596][ T7169] do_syscall_64+0xcc/0x370 [ 46.931093][ T7169] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 46.936951][ T7169] [ 46.939254][ T7169] Reported by Kernel Concurrency Sanitizer on: [ 46.945381][ T7169] CPU: 1 PID: 7169 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 46.952806][ T7169] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.963007][ T7169] ================================================================== [ 46.971064][ T7169] Kernel panic - not syncing: panic_on_warn set ... [ 46.977625][ T7169] CPU: 1 PID: 7169 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 46.985051][ T7169] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.999174][ T7169] Call Trace: [ 47.002451][ T7169] dump_stack+0xf5/0x159 [ 47.006684][ T7169] panic+0x210/0x640 [ 47.010557][ T7169] ? do_syscall_64+0xcc/0x370 [ 47.015212][ T7169] ? vprintk_func+0x8d/0x140 [ 47.019783][ T7169] kcsan_report.cold+0xc/0x10 [ 47.024440][ T7169] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 47.029977][ T7169] __tsan_read4+0x2c/0x30 [ 47.034285][ T7169] tcp_poll+0x204/0x6b0 [ 47.038421][ T7169] ? tcp_alloc_md5sig_pool+0x320/0x320 [ 47.043857][ T7169] sock_poll+0xed/0x250 [ 47.047992][ T7169] ? sock_read_iter+0x1e0/0x1e0 [ 47.052823][ T7169] ep_item_poll.isra.0+0x90/0x190 [ 47.057838][ T7169] ep_send_events_proc+0x113/0x590 [ 47.062925][ T7169] ? __schedule+0x319/0x640 [ 47.067407][ T7169] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 47.073021][ T7169] ep_scan_ready_list.constprop.0+0x189/0x500 [ 47.079063][ T7169] ? ep_loop_check_proc+0x2f0/0x2f0 [ 47.084264][ T7169] ep_poll+0xe3/0x900 [ 47.088298][ T7169] ? wake_up_q+0x70/0x70 [ 47.092537][ T7169] do_epoll_wait+0x162/0x180 [ 47.097151][ T7169] __x64_sys_epoll_pwait+0xcd/0x180 [ 47.102332][ T7169] do_syscall_64+0xcc/0x370 [ 47.106860][ T7169] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 47.112729][ T7169] RIP: 0033:0x45b300 [ 47.116603][ T7169] Code: 0f 05 89 44 24 20 c3 cc cc cc 8b 7c 24 08 48 8b 74 24 10 8b 54 24 18 44 8b 54 24 1c 49 c7 c0 00 00 00 00 b8 19 01 00 00 0f 05 <89> 44 24 20 c3 cc cc cc cc cc cc cc cc cc cc cc 8b 7c 24 08 48 c7 [ 47.136183][ T7169] RSP: 002b:000000c4202f7860 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 47.144580][ T7169] RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 000000000045b300 [ 47.152539][ T7169] RDX: 0000000000000080 RSI: 000000c4202f78a0 RDI: 0000000000000004 [ 47.160498][ T7169] RBP: 000000c4202f7ea0 R08: 0000000000000000 R09: 000000c4201be780 [ 47.168550][ T7169] R10: 00000000ffffffff R11: 0000000000000246 R12: 000000c42021e038 [ 47.176684][ T7169] R13: 000000000000000f R14: 0000000000c1aca0 R15: 0000000000000e61 [ 47.186034][ T7169] Kernel Offset: disabled [ 47.190361][ T7169] Rebooting in 86400 seconds..