[Varnish] #1494: panic on retry in vcl_backend_response

[Varnish]

#1494: panic on retry in vcl_backend_response
-------------------------+--------------------
 Reporter:  g.gerritsen  |       Type:  defect
   Status:  new          |   Priority:  normal
Milestone:               |  Component:  build
  Version:  4.0.0        |   Severity:  normal
 Keywords:               |
-------------------------+--------------------
 {{{#!python
 vcl_backend_response {
  if(beresp.status == 500) {
   return(retry);
  }
 }
 }}}

 gives the following panic on centos 6.5 when encountering a 503 status

 {{{#!python
 Child (30201) died signal=6 (core dumped)
 Child (30201) Panic message: Assert error in vbf_stp_startfetch(),
 cache/cache_fetch.c line 258:
   Condition((bo->should_close) == 0) not true.
 thread = (cache-worker)
 ident =
 Linux,2.6.32-431.11.2.el6.x86_64,x86_64,-smalloc,-smalloc,-hcritbit,epoll
 Backtrace:
   0x43a536: /usr/sbin/varnishd() [0x43a536]
   0x43a846: /usr/sbin/varnishd() [0x43a846]
   0x422e26: /usr/sbin/varnishd() [0x422e26]
   0x425273: /usr/sbin/varnishd() [0x425273]
   0x43c343: /usr/sbin/varnishd(Pool_Work_Thread+0x416) [0x43c343]
   0x454ce2: /usr/sbin/varnishd() [0x454ce2]
   0x454e0b: /usr/sbin/varnishd(WRK_thread+0x27) [0x454e0b]
   0x3f25c079d1: /lib64/libpthread.so.0() [0x3f25c079d1]
   0x3f258e8b6d: /lib64/libc.so.6(clone+0x6d) [0x3f258e8b6d]
   busyobj = 0x7f7fd00b7020 {
     ws = 0x7f7fd00b70e8 {
       id = "bo",
       {s,f,r,e} = {0x7f7fd00b8ff0,+552,(nil),+57392},
     },
   refcnt = 2
   retries = 1
   failed = 0
   state = 1
     is_do_stream
     is_should_close
     bodystatus = 3 (length),
     },
     http[bereq] = {
       ws = 0x7f7fd00b70e8[bo]
         "GET",
         "/503.php",
         "HTTP/1.1",
         "User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:29.0)
 Gecko/20100101 Firefox/29.0",
         "Accept:
 text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
         "Accept-Language: en-US,en;q=0.5",
         "X-Forwarded-For: 127.0.0.1, 127.0.0.1",
         "Host: monitor.nl.local",
         "Accept-Encoding: gzip",
         "X-Varnish: 3",
     },
     http[beresp] = {
       ws = 0x7f7fd00b70e8[bo]
         "HTTP/1.1",
         "503",
         "Internal Server Error",
         "Date: Tue, 06 May 2014 13:45:30 GMT",
         "Server: Apache/2.2.15 (CentOS)",
         "X-Powered-By: PHP/5.4.26",
         "Content-Length: 0",
         "Connection: close",
         "Content-Type: text/html; charset=UTF-8",
     },
     ws = 0x7f7fd00b7270 { BAD_MAGIC(0x00000000) },
     },
   objcore (FETCH) = 0x7f7fcb028080 {
     refcnt = 2
     flags = 0x2
     objhead = 0x7f7fcb02a080
   }
   }
 }}}

-- 
Ticket URL: <https://www.varnish-cache.org/trac/ticket/1494>
Varnish <https://varnish-cache.org/>
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