Child died on request

[Yiannis Karayiannidis]

Hello,
I would like to ask your for help for a really strange case that we have..
We have migrated from varnish 3.07 to varnish 4.03 few months ago. The last
few days.
we have a strange problem.
Child died on request. The backends was unreachable at that time (we are
using a hash director).
We did get a panic message like :

varnishd[30906]: Child (6755) Panic message:#012Assert error in
VDI_GetFd(), cache/cache_dir.c line 111:#012  Condition((d) != NULL) not
true.
#012thread = (cache-worker)#012version = varnish-4.0.3 revision
b8c4a34#012ident =
Linux,3.10.0-327.10.1.el7.x86_64,x86_64,-smalloc,-smalloc,-hcritbit,epoll#012
Backtrace:#012  0x7eff9489f6b3: /usr/sbin/varnishd(+0x3e6b3)
[0x7eff9489f6b3]#012  0x7eff948813c4: /usr/sbin/varnishd(VDI_GetFd+0xe4)
[0x7eff948813c4]#012  0x7eff948a021b: /usr/sbin/varnishd(PipeRequest+0xcb)
[0x7eff948a021b]#012  0x7eff948a432c: /usr/sbin/varnishd(CNT_Request+0xaec)
[0x7eff948a432c]
#012  0x7eff94898f2b: /usr/sbin/varnishd(HTTP1_Session+0x7eb)
[0x7eff94898f2b]#012  0x7eff948a8747: /usr/sbin/varnishd(+0x47747)
[0x7eff948a8747]#012
0x7eff948a9878: /usr/sbin/varnishd(SES_pool_accept_task+0x2b8)
[0x7eff948a9878]#012  0x7eff948a291d:
/usr/sbin/varnishd(Pool_Work_Thread+0x39d) [0x7eff948a291d]#012
0x7eff948b7bc2: /usr/sbin/varnishd(+0x56bc2) [0x7eff948b7bc2]#012
0x7eff93029dc5: /lib64/libpthread.so.0(+0x7dc5)
[0x7eff93029dc5]#012req = 0x7eff64012020 {#012  sp = 0x7eff6281ae20, vxid =
1075806210,  step = R_STP_PIPE,#012  req_body = R_BODY_PRESENT,#012
restarts = 0, esi_level = 0,
#012  sp = 0x7eff6281ae20 {#012    fd = 122, vxid = 2064385,#012    client
= 172.16.50.169 46012,#012    step
= S_STP_WORKING,#012  },#012  worker = 0x7eff36b90c50 {#012    ws =
0x7eff36b90e70 {#012      id = "wrk",#012      {s,f,r,e} =
{0x7eff36b90450,0x7eff36b90450,(nil),+2048},#012    },
#012  VCL::method = 0x0,#012  VCL::return = pipe,#012  },#012  ws =
0x7eff640121b8 {#012    id = "req",#012    {s,f,r,e} =
{0x7eff64014010,+1480,(nil),+57360},#012  },
#012  http[req] = {#012    ws
= 0x7eff640121b8[req]#012      "POST",#012      "/api/login",#012
"HTTP/1.1",#012      "Host: www.xxx.com",#012
     "X-Real-IP: 188.73.254.105",#012      "X-Forwarded-Proto: https",
     #012      "Connection: close",#012      "Content-Length: 39",#012
"Accept-Encoding: gzip",#012      "CF-IPCountry: GR",#012      "CF-RAY:
28735bfd70642342-FRA",#012
     "CF-Visitor: {"scheme":"https"}",#012      "accept: */*",#012
     "accept-language: en-GR;q=1.0, el-GR;q=0.9",#012      "content-type:
application/json",#012
     "cookie: __cfduid=dbe3f7943ad953c0c32fed9c23d5ec53e1456395183;
_ga=GA1.2.1866397751.1458056300;

 exauth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

     "user-agent: xxx/com.bbb.ccc (37; OS Version 9.0.2 (Build
13A452))",#012
  "x-requested-with: XMLHttpRequest",#012      "CF-Connecting-IP:
188.73.254.105",#012      "X-Forwarded-For: 188.73.254.105,
188.73.254.105, 173.16.50.169",#012      "X-defHash: /login +
www.xxx.com",#012
},#012  vcl = {#012
srcname = {#012      "input",#012      "Builtin",#012
"origins-xxx.vcl",#012      "origins-xxx.vcl",#012
"origins-others.vcl",#012      "origins-staging.vcl",#012
      "banlist.vcl",#012    },#012  },#012},
 lin-varnish03 varnishd[30906]: Child cleanup complete
 lin-varnish03 varnishd[30906]: child (13007) Started


Thanks in advance
Yiannis
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