[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.43' (ECDSA) to the list of known hosts. 2020/06/12 04:16:12 fuzzer started 2020/06/12 04:16:12 dialing manager at 10.128.0.105:39483 2020/06/12 04:16:12 syscalls: 3085 2020/06/12 04:16:12 code coverage: enabled 2020/06/12 04:16:12 comparison tracing: enabled 2020/06/12 04:16:12 extra coverage: enabled 2020/06/12 04:16:12 setuid sandbox: enabled 2020/06/12 04:16:12 namespace sandbox: enabled 2020/06/12 04:16:12 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/12 04:16:12 fault injection: enabled 2020/06/12 04:16:12 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/12 04:16:12 net packet injection: enabled 2020/06/12 04:16:12 net device setup: enabled 2020/06/12 04:16:12 concurrency sanitizer: enabled 2020/06/12 04:16:12 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/12 04:16:12 USB emulation: enabled 2020/06/12 04:16:13 adding functions to KCSAN blacklist: 'add_timer' 'file_update_time' 'blk_mq_get_request' 'xas_clear_mark' syzkaller login: [ 53.070489][ T8907] ================================================================== [ 53.078784][ T8907] BUG: KCSAN: data-race in ep_poll / ep_poll_callback [ 53.085552][ T8907] [ 53.087877][ T8907] write to 0xffff8881269801d0 of 8 bytes by interrupt on cpu 0: [ 53.095487][ T8907] ep_poll_callback+0x5f2/0x6c0 [ 53.100315][ T8907] __wake_up_common+0x76/0x180 [ 53.105070][ T8907] __wake_up_common_lock+0x77/0xb0 [ 53.110314][ T8907] sock_def_readable+0x9d/0x130 [ 53.115252][ T8907] tcp_data_ready+0x76/0xc0 [ 53.119850][ T8907] tcp_data_queue+0xd09/0x20a0 [ 53.124598][ T8907] tcp_rcv_established+0x4fc/0xee0 [ 53.129700][ T8907] tcp_v4_do_rcv+0x396/0x4f0 [ 53.134266][ T8907] tcp_v4_rcv+0x1c55/0x1e10 [ 53.138761][ T8907] ip_protocol_deliver_rcu+0x4b/0x410 [ 53.144308][ T8907] ip_local_deliver_finish+0xf3/0x120 [ 53.149667][ T8907] ip_local_deliver+0x135/0x220 [ 53.154492][ T8907] ip_sublist_rcv_finish+0xf0/0x140 [ 53.159677][ T8907] ip_sublist_rcv+0x3f8/0x530 [ 53.164327][ T8907] ip_list_rcv+0x2f3/0x321 [ 53.168735][ T8907] __netif_receive_skb_list_core+0x368/0x5c0 [ 53.174720][ T8907] netif_receive_skb_list_internal+0x5c7/0x810 [ 53.180882][ T8907] gro_normal_list.part.0+0x37/0xa0 [ 53.186130][ T8907] gro_normal_one+0x14c/0x160 [ 53.190838][ T8907] napi_gro_receive+0x27d/0x2f0 [ 53.195730][ T8907] receive_buf+0x24c/0x3420 [ 53.200234][ T8907] virtnet_poll+0x343/0x790 [ 53.204828][ T8907] net_rx_action+0x3ad/0xac0 [ 53.209422][ T8907] __do_softirq+0x118/0x34a [ 53.213926][ T8907] run_ksoftirqd+0x41/0x60 [ 53.218345][ T8907] smpboot_thread_fn+0x374/0x4a0 [ 53.223312][ T8907] kthread+0x203/0x230 [ 53.227383][ T8907] ret_from_fork+0x1f/0x30 [ 53.231783][ T8907] [ 53.234436][ T8907] read to 0xffff8881269801d0 of 8 bytes by task 8907 on cpu 1: [ 53.241963][ T8907] ep_poll+0x8f/0x910 [ 53.246631][ T8907] do_epoll_wait+0x15a/0x180 [ 53.251220][ T8907] __x64_sys_epoll_pwait+0xc6/0x170 [ 53.256419][ T8907] do_syscall_64+0xc7/0x3b0 [ 53.260919][ T8907] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.266793][ T8907] [ 53.269129][ T8907] Reported by Kernel Concurrency Sanitizer on: [ 53.275459][ T8907] CPU: 1 PID: 8907 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 53.283759][ T8907] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.293800][ T8907] ================================================================== [ 53.301853][ T8907] Kernel panic - not syncing: panic_on_warn set ... [ 53.308446][ T8907] CPU: 1 PID: 8907 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 53.316694][ T8907] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.326748][ T8907] Call Trace: [ 53.330030][ T8907] dump_stack+0x11d/0x187 [ 53.334355][ T8907] panic+0x210/0x640 [ 53.338261][ T8907] ? vprintk_func+0x89/0x13a [ 53.342827][ T8907] kcsan_report.cold+0xc/0x1a [ 53.347489][ T8907] kcsan_setup_watchpoint+0x3fb/0x440 [ 53.352851][ T8907] ep_poll+0x8f/0x910 [ 53.356920][ T8907] ? __fget_files+0xa2/0x1c0 [ 53.361526][ T8907] ? __fget_light+0xc0/0x1a0 [ 53.366119][ T8907] do_epoll_wait+0x15a/0x180 [ 53.370696][ T8907] __x64_sys_epoll_pwait+0xc6/0x170 [ 53.375908][ T8907] do_syscall_64+0xc7/0x3b0 [ 53.380400][ T8907] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.386284][ T8907] RIP: 0033:0x469240 [ 53.390169][ T8907] 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 [ 53.409762][ T8907] RSP: 002b:000000c00004f7f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 53.418153][ T8907] RAX: ffffffffffffffda RBX: 00000000000003e0 RCX: 0000000000469240 [ 53.426104][ T8907] RDX: 0000000000000080 RSI: 000000c00004f840 RDI: 0000000000000003 [ 53.434073][ T8907] RBP: 000000c00004fe40 R08: 0000000000000000 R09: 0000000000000035 [ 53.442113][ T8907] R10: 00000000000003e0 R11: 0000000000000246 R12: 0000000000000003 [ 53.450081][ T8907] R13: 000000c000000900 R14: 000000522e4566d6 R15: 0000000000000201 [ 53.459652][ T8907] Kernel Offset: disabled [ 53.463981][ T8907] Rebooting in 86400 seconds..