[info] Using makefile-style concurrent boot in runlevel 2. [ 44.338511][ T26] audit: type=1800 audit(1571696255.508:21): pid=7221 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 44.378238][ T26] audit: type=1800 audit(1571696255.508:22): pid=7221 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 '10.128.0.89' (ECDSA) to the list of known hosts. 2019/10/21 22:17:47 fuzzer started 2019/10/21 22:17:49 dialing manager at 10.128.0.105:39747 2019/10/21 22:17:49 syscalls: 2524 2019/10/21 22:17:49 code coverage: enabled 2019/10/21 22:17:49 comparison tracing: enabled 2019/10/21 22:17:49 extra coverage: extra coverage is not supported by the kernel 2019/10/21 22:17:49 setuid sandbox: enabled 2019/10/21 22:17:49 namespace sandbox: enabled 2019/10/21 22:17:49 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/21 22:17:49 fault injection: enabled 2019/10/21 22:17:49 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/21 22:17:49 net packet injection: enabled 2019/10/21 22:17:49 net device setup: enabled 2019/10/21 22:17:49 concurrency sanitizer: enabled syzkaller login: [ 59.344829][ T7387] ================================================================== [ 59.353451][ T7387] BUG: KCSAN: data-race in tcp_poll / tcp_queue_rcv [ 59.360486][ T7387] [ 59.362819][ T7387] write to 0xffff888121818e78 of 4 bytes by interrupt on cpu 0: [ 59.370468][ T7387] tcp_queue_rcv+0xe9/0x380 [ 59.374966][ T7387] tcp_rcv_established+0xbf1/0xf50 [ 59.380204][ T7387] tcp_v4_do_rcv+0x381/0x4e0 [ 59.384811][ T7387] tcp_v4_rcv+0x19dc/0x1bb0 [ 59.389636][ T7387] ip_protocol_deliver_rcu+0x4d/0x420 [ 59.394988][ T7387] ip_local_deliver_finish+0x110/0x140 [ 59.400443][ T7387] ip_local_deliver+0x133/0x210 [ 59.405480][ T7387] ip_rcv_finish+0x121/0x160 [ 59.410149][ T7387] ip_rcv+0x18f/0x1a0 [ 59.414331][ T7387] __netif_receive_skb_one_core+0xa7/0xe0 [ 59.420399][ T7387] __netif_receive_skb+0x37/0xf0 [ 59.425319][ T7387] netif_receive_skb_internal+0x59/0x190 [ 59.431021][ T7387] napi_gro_receive+0x28f/0x330 [ 59.435853][ T7387] receive_buf+0x284/0x30b0 [ 59.440329][ T7387] [ 59.442639][ T7387] read to 0xffff888121818e78 of 4 bytes by task 7387 on cpu 1: [ 59.450687][ T7387] tcp_poll+0x204/0x6b0 [ 59.454913][ T7387] sock_poll+0xed/0x250 [ 59.459260][ T7387] ep_item_poll.isra.0+0x90/0x190 [ 59.464277][ T7387] ep_send_events_proc+0x113/0x590 [ 59.470107][ T7387] ep_scan_ready_list.constprop.0+0x189/0x500 [ 59.476289][ T7387] ep_poll+0xe3/0x900 [ 59.480380][ T7387] do_epoll_wait+0x162/0x180 [ 59.485653][ T7387] __x64_sys_epoll_pwait+0xcd/0x180 [ 59.490860][ T7387] do_syscall_64+0xcc/0x370 [ 59.495349][ T7387] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 59.501216][ T7387] [ 59.503533][ T7387] Reported by Kernel Concurrency Sanitizer on: [ 59.509689][ T7387] CPU: 1 PID: 7387 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 59.517133][ T7387] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.527253][ T7387] ================================================================== [ 59.535312][ T7387] Kernel panic - not syncing: panic_on_warn set ... [ 59.541882][ T7387] CPU: 1 PID: 7387 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 59.549419][ T7387] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.559449][ T7387] Call Trace: [ 59.562726][ T7387] dump_stack+0xf5/0x159 [ 59.567044][ T7387] panic+0x210/0x640 [ 59.570925][ T7387] ? do_syscall_64+0xcc/0x370 [ 59.575608][ T7387] ? vprintk_func+0x8d/0x140 [ 59.580193][ T7387] kcsan_report.cold+0xc/0x10 [ 59.584881][ T7387] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 59.590595][ T7387] __tsan_read4+0x2c/0x30 [ 59.595036][ T7387] tcp_poll+0x204/0x6b0 [ 59.599208][ T7387] ? tcp_alloc_md5sig_pool+0x320/0x320 [ 59.604652][ T7387] sock_poll+0xed/0x250 [ 59.608797][ T7387] ? sock_read_iter+0x1e0/0x1e0 [ 59.613631][ T7387] ep_item_poll.isra.0+0x90/0x190 [ 59.618726][ T7387] ep_send_events_proc+0x113/0x590 [ 59.623934][ T7387] ? __schedule+0x319/0x640 [ 59.628416][ T7387] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 59.634120][ T7387] ep_scan_ready_list.constprop.0+0x189/0x500 [ 59.640205][ T7387] ? ep_loop_check_proc+0x2f0/0x2f0 [ 59.645425][ T7387] ep_poll+0xe3/0x900 [ 59.649432][ T7387] ? wake_up_q+0x70/0x70 [ 59.653870][ T7387] do_epoll_wait+0x162/0x180 [ 59.658449][ T7387] __x64_sys_epoll_pwait+0xcd/0x180 [ 59.663631][ T7387] do_syscall_64+0xcc/0x370 [ 59.668119][ T7387] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 59.674005][ T7387] RIP: 0033:0x45b300 [ 59.677899][ T7387] 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 [ 59.697598][ T7387] RSP: 002b:000000c420381860 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 59.706007][ T7387] RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 000000000045b300 [ 59.714061][ T7387] RDX: 0000000000000080 RSI: 000000c4203818a0 RDI: 0000000000000004 [ 59.722101][ T7387] RBP: 000000c420381ea0 R08: 0000000000000000 R09: 0000000000000000 [ 59.730053][ T7387] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000040 [ 59.738434][ T7387] R13: ffffffffffffffff R14: 0000000000000010 R15: ffffffffffffffff [ 59.748313][ T7387] Kernel Offset: disabled [ 59.752644][ T7387] Rebooting in 86400 seconds..