[ 43.250576][ T26] audit: type=1800 audit(1571755175.800:23): pid=7142 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rsyslog" dev="sda1" ino=2475 res=0 [ 43.271378][ T26] audit: type=1800 audit(1571755175.800:24): pid=7142 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="sudo" dev="sda1" ino=2487 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [ 44.233354][ T7213] sshd (7213) used greatest stack depth: 10136 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.61' (ECDSA) to the list of known hosts. 2019/10/22 14:39:46 fuzzer started 2019/10/22 14:39:48 dialing manager at 10.128.0.105:33369 2019/10/22 14:39:48 syscalls: 2524 2019/10/22 14:39:48 code coverage: enabled 2019/10/22 14:39:48 comparison tracing: enabled 2019/10/22 14:39:48 extra coverage: extra coverage is not supported by the kernel 2019/10/22 14:39:48 setuid sandbox: enabled 2019/10/22 14:39:48 namespace sandbox: enabled 2019/10/22 14:39:48 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 14:39:48 fault injection: enabled 2019/10/22 14:39:48 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 14:39:48 net packet injection: enabled 2019/10/22 14:39:48 net device setup: enabled 2019/10/22 14:39:48 concurrency sanitizer: enabled syzkaller login: [ 56.037049][ T7293] ================================================================== [ 56.045198][ T7293] BUG: KCSAN: data-race in tcp_poll / tcp_queue_rcv [ 56.051774][ T7293] [ 56.054161][ T7293] write to 0xffff88811daa5778 of 4 bytes by interrupt on cpu 0: [ 56.061781][ T7293] tcp_queue_rcv+0xe9/0x380 [ 56.066273][ T7293] tcp_rcv_established+0xbf1/0xf50 [ 56.071365][ T7293] tcp_v4_do_rcv+0x381/0x4e0 [ 56.075951][ T7293] tcp_v4_rcv+0x19dc/0x1bb0 [ 56.080432][ T7293] ip_protocol_deliver_rcu+0x4d/0x420 [ 56.085783][ T7293] ip_local_deliver_finish+0x110/0x140 [ 56.091220][ T7293] ip_local_deliver+0x133/0x210 [ 56.096054][ T7293] ip_rcv_finish+0x121/0x160 [ 56.100666][ T7293] ip_rcv+0x18f/0x1a0 [ 56.104676][ T7293] __netif_receive_skb_one_core+0xa7/0xe0 [ 56.110414][ T7293] __netif_receive_skb+0x37/0xf0 [ 56.115367][ T7293] netif_receive_skb_internal+0x59/0x190 [ 56.120977][ T7293] napi_gro_receive+0x28f/0x330 [ 56.125807][ T7293] receive_buf+0x284/0x30b0 [ 56.130283][ T7293] [ 56.132654][ T7293] read to 0xffff88811daa5778 of 4 bytes by task 7293 on cpu 1: [ 56.140180][ T7293] tcp_poll+0x204/0x6b0 [ 56.144344][ T7293] sock_poll+0xed/0x250 [ 56.148482][ T7293] ep_item_poll.isra.0+0x90/0x190 [ 56.153518][ T7293] ep_send_events_proc+0x113/0x590 [ 56.158609][ T7293] ep_scan_ready_list.constprop.0+0x189/0x500 [ 56.164665][ T7293] ep_poll+0xe3/0x900 [ 56.168630][ T7293] do_epoll_wait+0x162/0x180 [ 56.173204][ T7293] __x64_sys_epoll_pwait+0xcd/0x180 [ 56.178402][ T7293] do_syscall_64+0xcc/0x370 [ 56.182896][ T7293] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.188760][ T7293] [ 56.191064][ T7293] Reported by Kernel Concurrency Sanitizer on: [ 56.197200][ T7293] CPU: 1 PID: 7293 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 56.204629][ T7293] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.214673][ T7293] ================================================================== [ 56.222732][ T7293] Kernel panic - not syncing: panic_on_warn set ... [ 56.229305][ T7293] CPU: 1 PID: 7293 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 56.236764][ T7293] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.246799][ T7293] Call Trace: [ 56.250097][ T7293] dump_stack+0xf5/0x159 [ 56.254322][ T7293] panic+0x210/0x640 [ 56.258210][ T7293] ? do_syscall_64+0xcc/0x370 [ 56.262885][ T7293] ? vprintk_func+0x8d/0x140 [ 56.267460][ T7293] kcsan_report.cold+0xc/0x10 [ 56.272127][ T7293] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 56.277659][ T7293] __tsan_read4+0x2c/0x30 [ 56.281986][ T7293] tcp_poll+0x204/0x6b0 [ 56.286149][ T7293] ? tcp_alloc_md5sig_pool+0x320/0x320 [ 56.291604][ T7293] sock_poll+0xed/0x250 [ 56.295755][ T7293] ? sock_read_iter+0x1e0/0x1e0 [ 56.300587][ T7293] ep_item_poll.isra.0+0x90/0x190 [ 56.305611][ T7293] ep_send_events_proc+0x113/0x590 [ 56.310726][ T7293] ? __schedule+0x319/0x640 [ 56.315225][ T7293] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 56.320847][ T7293] ep_scan_ready_list.constprop.0+0x189/0x500 [ 56.326898][ T7293] ? ep_loop_check_proc+0x2f0/0x2f0 [ 56.332080][ T7293] ep_poll+0xe3/0x900 [ 56.336061][ T7293] ? wake_up_q+0x70/0x70 [ 56.340288][ T7293] do_epoll_wait+0x162/0x180 [ 56.344860][ T7293] __x64_sys_epoll_pwait+0xcd/0x180 [ 56.350059][ T7293] do_syscall_64+0xcc/0x370 [ 56.354557][ T7293] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.360441][ T7293] RIP: 0033:0x45b300 [ 56.364319][ T7293] 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 [ 56.384090][ T7293] RSP: 002b:000000c42014d860 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 56.392483][ T7293] RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 000000000045b300 [ 56.400448][ T7293] RDX: 0000000000000080 RSI: 000000c42014d8a0 RDI: 0000000000000004 [ 56.408501][ T7293] RBP: 000000c42014dea0 R08: 0000000000000000 R09: 0000000000000000 [ 56.416459][ T7293] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000008 [ 56.424426][ T7293] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 56.433891][ T7293] Kernel Offset: disabled [ 56.438234][ T7293] Rebooting in 86400 seconds..