[  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.
[  OK  ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch.


Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.74' (ECDSA) to the list of known hosts.
2020/06/13 04:36:00 fuzzer started
2020/06/13 04:36:00 dialing manager at 10.128.0.105:39701
2020/06/13 04:36:01 syscalls: 3085
2020/06/13 04:36:01 code coverage: enabled
2020/06/13 04:36:01 comparison tracing: enabled
2020/06/13 04:36:01 extra coverage: enabled
2020/06/13 04:36:01 setuid sandbox: enabled
2020/06/13 04:36:01 namespace sandbox: enabled
2020/06/13 04:36:01 Android sandbox: /sys/fs/selinux/policy does not exist
2020/06/13 04:36:01 fault injection: enabled
2020/06/13 04:36:01 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/06/13 04:36:01 net packet injection: enabled
2020/06/13 04:36:01 net device setup: enabled
2020/06/13 04:36:01 concurrency sanitizer: enabled
2020/06/13 04:36:01 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/06/13 04:36:01 USB emulation: enabled
2020/06/13 04:36:01 adding functions to KCSAN blacklist: 'alloc_pid' 'find_get_pages_range_tag' 
syzkaller login: [   51.959134][ T8904] ==================================================================
[   51.967645][ T8904] BUG: KCSAN: data-race in ep_poll / ep_poll_callback
[   51.974505][ T8904] 
[   51.976834][ T8904] write to 0xffff8881269c74d0 of 8 bytes by interrupt on cpu 1:
[   51.984688][ T8904]  ep_poll_callback+0x5f2/0x6c0
[   51.989914][ T8904]  __wake_up_common+0x76/0x180
[   51.994702][ T8904]  __wake_up_common_lock+0x77/0xb0
[   51.999934][ T8904]  sock_def_readable+0x9d/0x130
[   52.004984][ T8904]  tcp_data_ready+0x76/0xc0
[   52.009498][ T8904]  tcp_rcv_established+0xcb8/0xee0
[   52.014683][ T8904]  tcp_v4_do_rcv+0x396/0x4f0
[   52.019259][ T8904]  tcp_v4_rcv+0x1c55/0x1e10
[   52.023778][ T8904]  ip_protocol_deliver_rcu+0x4b/0x410
[   52.029352][ T8904]  ip_local_deliver_finish+0xf3/0x120
[   52.034856][ T8904]  ip_local_deliver+0x135/0x220
[   52.039699][ T8904]  ip_sublist_rcv_finish+0xf0/0x140
[   52.045205][ T8904]  ip_sublist_rcv+0x3f8/0x530
[   52.049911][ T8904]  ip_list_rcv+0x2f3/0x321
[   52.054330][ T8904]  __netif_receive_skb_list_core+0x368/0x5c0
[   52.060637][ T8904]  netif_receive_skb_list_internal+0x5c7/0x810
[   52.066969][ T8904]  gro_normal_list.part.0+0x37/0xa0
[   52.072160][ T8904]  gro_normal_one+0x14c/0x160
[   52.076877][ T8904]  napi_gro_receive+0x27d/0x2f0
[   52.081721][ T8904]  receive_buf+0x24c/0x3420
[   52.086257][ T8904]  virtnet_poll+0x343/0x790
[   52.090744][ T8904]  net_rx_action+0x3ad/0xac0
[   52.095388][ T8904]  __do_softirq+0x118/0x34a
[   52.099957][ T8904]  run_ksoftirqd+0x41/0x60
[   52.104374][ T8904]  smpboot_thread_fn+0x374/0x4a0
[   52.109605][ T8904]  kthread+0x203/0x230
[   52.113704][ T8904]  ret_from_fork+0x1f/0x30
[   52.118102][ T8904] 
[   52.120457][ T8904] read to 0xffff8881269c74d0 of 8 bytes by task 8904 on cpu 0:
[   52.128077][ T8904]  ep_poll+0x473/0x910
[   52.132172][ T8904]  do_epoll_wait+0x15a/0x180
[   52.137096][ T8904]  __x64_sys_epoll_pwait+0xc6/0x170
[   52.142338][ T8904]  do_syscall_64+0xc7/0x3b0
[   52.146864][ T8904]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   52.152733][ T8904] 
[   52.155044][ T8904] Reported by Kernel Concurrency Sanitizer on:
[   52.161197][ T8904] CPU: 0 PID: 8904 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0
[   52.169542][ T8904] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   52.179588][ T8904] ==================================================================
[   52.187636][ T8904] Kernel panic - not syncing: panic_on_warn set ...
[   52.194265][ T8904] CPU: 0 PID: 8904 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0
[   52.202570][ T8904] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   52.212633][ T8904] Call Trace:
[   52.216093][ T8904]  dump_stack+0x11d/0x187
[   52.220596][ T8904]  panic+0x210/0x640
[   52.224485][ T8904]  ? vprintk_func+0x89/0x13a
[   52.229065][ T8904]  kcsan_report.cold+0xc/0x1a
[   52.234373][ T8904]  kcsan_setup_watchpoint+0x3fb/0x440
[   52.239916][ T8904]  ep_poll+0x473/0x910
[   52.243989][ T8904]  ? __fget_light+0xc0/0x1a0
[   52.248569][ T8904]  do_epoll_wait+0x15a/0x180
[   52.253158][ T8904]  __x64_sys_epoll_pwait+0xc6/0x170
[   52.258382][ T8904]  do_syscall_64+0xc7/0x3b0
[   52.262880][ T8904]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   52.268858][ T8904] RIP: 0033:0x469240
[   52.272902][ T8904] 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
[   52.292757][ T8904] RSP: 002b:000000c00004f7f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000119
[   52.301373][ T8904] RAX: ffffffffffffffda RBX: 0000000000000186 RCX: 0000000000469240
[   52.309464][ T8904] RDX: 0000000000000080 RSI: 000000c00004f840 RDI: 0000000000000003
[   52.317669][ T8904] RBP: 000000c00004fe40 R08: 0000000000000000 R09: 0000000000000000
[   52.325637][ T8904] R10: 0000000000000186 R11: 0000000000000246 R12: 0000000000000003
[   52.333596][ T8904] R13: 000000c000000900 R14: 0000000000000002 R15: 0000000000000002
[   52.343227][ T8904] Kernel Offset: disabled
[   52.347593][ T8904] Rebooting in 86400 seconds..