Varnish Issue

[Nikos Theodosiadis]

Hello everyone,
today i had a strange panic error on my Varnish.
It is not really obvious to me what went wrong, any help would be much
appreciated.
I'm  running varnish 6.0.3


Panic at: Tue, 19 Nov 2019 19:28:02 GMT
Assert error in vbf_stp_error(), cache/cache_fetch.c line
800:Condition((VSB_finish(synth_body)) == 0) not true.
version = varnish-6.0.3 revision 7d1ded3aa033a018317dbafc61587026ea2ef8a3,
vrt api = 7.0
ident =
Linux,3.10.0-693.11.6.el7.x86_64,x86_64,-junix,-smalloc,-sdefault,-hcritbit,epoll
now = 17076364.384963 (mono), 1574191668.252235 (real)
Backtrace:
errno = 12 (Cannot allocate memory)
thread = (cache-worker)
thr.req = (nil) {
},
thr.busyobj = 0x7fada9c7e020 {
  end = 0x7fada9c8e000,
  retries = 0,
  sp = 0x7fad00501620 {
    fd = 13433, vxid = 694059016,
    t_open = 1574191668.121636,
    t_idle = 1574191668.121636,
    ws = 0x7fad00501660 {
      id = \"ses\",
      {s, f, r, e} = {0x7fad00501698, +56, (nil), +352},
    },
    transport = HTTP/1 {
      state = HTTP1::Proc
    }
    client = 0.0.0.0 0 /dev/shm/varnish.sock,
  },
  worker = 0x7fac63522bd0 {
    ws = 0x7fac63522c78 {
      id = \"wrk\",
      {s, f, r, e} = {0x7fac63522380, +0, (nil), +2040},
    },
    VCL::method = BACKEND_ERROR,
    VCL::return = fail,
    VCL::methods = {BACKEND_FETCH, BACKEND_RESPONSE, BACKEND_ERROR},
  },
  vfc = 0x7fada9c7ff10 {
    failed = 1,
    req = 0x7fada9c7e620,
    resp = 0x7fada9c7ea98,
    wrk = 0x7fac63522bd0,
    oc = 0x7fac9bd5f140,
    filters = {
      V1F_STRAIGHT = 0x7fada9c858c0 {
        priv1 = 0x7fada9c808c0,
        priv2 = 19999,
        closed = 0
      },
    },
    obj_flags = 0x0,
  },
  ws = 0x7fada9c7e058 {
    id = \"bo\",
    {s, f, r, e} = {0x7fada9c7ff58, +23096, (nil), +57504},
  },
  ws_bo = 0x7fada9c808a8,
  http[bereq] = 0x7fada9c7e620 {
    ws = 0x7fada9c7e058 {
      [Already dumped, see above]
    },
    hdrs {
      \"GET\",
      \"/openreqs?_=1574191667646\",
      \"HTTP/1.1\",
      \"Host: www.xxx.yy\",
      \"X-Real-IP: 176.58.172.113\",
      \"X-Forwarded-Proto: https\",
      \"Accept-Encoding: gzip\",
      \"CF-IPCountry: GB\",
      \"accept: application/json, text/javascript, /; q=0.01\",
      \"dnt: 1\",
      \"x-requested-with: XMLHttpRequest\",
      \"user-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_1)
AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36\",
      \"sec-fetch-site: same-origin\",
      \"sec-fetch-mode: cors\",
      \"referer: https://www.xxx.yy/\",
      \"accept-language:
en-GB,en;q=0.9,q=0.8,el;q=0.7,en-US;q=0.6,de;q=0.5\",
      \"CF-Connecting-IP: 176.58.172.113\",
      \"CDN-Loop:MF\",
      \"X-Forwarded-For: 176.58.172.113, 176.58.172.113, 0.0.0.0\",
      \"sticky: 9.385\",
      \"cookie: __uid=d69a4ebccdf450dca2f56195270fb54101561187829;
_landing=1;sticky=stx9.385; _tz=120; _tz_intl=Europe%2FLondon; ",
      \"X-defHash: /openreqs?_=1574191667646 + www.xxx.yy\",
      \"X-Varnish: 694059018\",
    },
  },
  http[beresp] = 0x7fada9c7ea98 {
    ws = 0x7fada9c7e058 {
      [Already dumped, see above]
    },
    hdrs {
      \"HTTP/1.1\",
      \"503\",
      \"Backend fetch failed\",
      \"Date: Tue, 19 Nov 2019 19:27:48 GMT\",
      \"Server: Varnish\",
      \"Content-Type: text/html; charset=utf-8\",
      \"Retry-After: 5\",
    },
  },
  objcore[fetch] = 0x7fac9bd5f140 {
    refcnt = 2,
    flags = {busy, hfm, private},
    exp_flags = {},
    boc = 0x7fac9bd61ce0 {
      refcnt = 2,
      state = req_done,
      vary = (nil),
      stevedore_priv = (nil),
    },
    exp = {1574191668.252177, 0.000000, 0.000000, 0.000000},
    objhead = 0x7faeea0ce160,
    stevedore = (nil),
  },
  flags = {do_stream, do_pass, uncacheable},
  director_req = 0x7faeea0e1310 {
    vcl_name = web01,
    health = healthy,
    admin_health = probe, changed = 1574176692.243255,
    type = backend {
      display_name = boot.web01,
      ipv4 = xxx.xxx.xxx.xxx,
      port = 80,
      hosthdr = xxx.xxx.xxx.xxx,
      n_conn = 24,
    },
  },
  director_resp = director_req,
  vcl = {
    name = \"boot\",
    busy = 46459,
    discard = 0,
    state = auto,
    temp = warm,
    conf = {
      syntax = \"41\",
      srcname = {
        \"/etc/varnish/default.vcl\",
        \"Builtin\",
        \"/etc/varnish/origins1.vcl\",
        \"/etc/varnish/origins-2.vcl\",
        \"/etc/varnish/origins-3.vcl\",
        \"/etc/varnish/origins-others.vcl\",
        \"/etc/varnish/origins-4.vcl\",
        \"/etc/varnish/origins5.vcl\",
        \"/etc/varnish/ban.vcl\",
        \"/etc/varnish/backend_error.vcl\",
      },
    },
  },
},
vmods = {
  std = {Varnish 6.0.3 7d1ded3aa033a018317dbafc61587026ea2ef8a3, 0.0},
  directors = {Varnish 6.0.3 7d1ded3aa033a018317dbafc61587026ea2ef8a3, 0.0},
  cookie = {Varnish 6.0.3 7d1ded3aa033a018317dbafc61587026ea2ef8a3, 7.0},
  header = {Varnish 6.0.3 7d1ded3aa033a018317dbafc61587026ea2ef8a3, 7.0},
},


   Could you please take a look and advise?


Thank you in advance

Regards
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://www.varnish-cache.org/lists/pipermail/varnish-misc/attachments/20191119/7d038d57/attachment-0001.html>