[Varnish] #1037: Assert in VGZ_Destroy

[Varnish]

#1037: Assert in VGZ_Destroy
----------------------+-----------------------------------------------------
 Reporter:  scoof     |       Owner:       
     Type:  defect    |      Status:  new  
 Priority:  normal    |   Milestone:       
Component:  varnishd  |     Version:  trunk
 Severity:  normal    |    Keywords:       
----------------------+-----------------------------------------------------
 While trying to figure out what triggered #1036, I triggered this assert:

 {{{
 Last panic at: Mon, 24 Oct 2011 11:19:05 GMT
 Assert error in VGZ_Destroy(), cache_gzip.c line 426:
   Condition((deflateEnd(&vg->vz)) == 0) not true.
 thread = (cache-worker)
 ident = Linux,3.0.0-1-amd64,x86_64,-smalloc,-smalloc,-hcritbit,epoll
 Backtrace:
   0x42f2d5: pan_ic+d5
   0x425c50: VGZ_Destroy+140
   0x41dc71: vfp_esi_end+171
   0x423f5f: FetchBody+88f
   0x415aa8: cnt_fetchbody+5b8
   0x417865: CNT_Session+905
   0x430cfd: Pool_Work_Thread+1bd
   0x43fca2: wrk_thread_real+202
   0x7f0ac00b2b40: _end+7f0abfa32e10
   0x7f0abfdfd36d: _end+7f0abf77d63d
 sp = 0x7f0aafb02040 {
   fd = 14, id = 14, xid = 1795924191,
   client = 127.0.0.1 50335,
   step = STP_FETCHBODY,
   handling = deliver,
   err_code = 200, err_reason = (null),
   restarts = 0, esi_level = 0
   flags =  do_esi is_gzip
   bodystatus = 3
   ws = 0x7f0aafb021a8 {
     id = "sess",
     {s,f,r,e} = {0x7f0aafb02c48,+192,(nil),+65536},
   },
   http[req] = {
     ws = 0x7f0aafb021a8[sess]
       "GET",
       "/esi.html?1",
       "HTTP/1.1",
       "User-Agent: Wget/1.13 (linux-gnu)",
       "Accept: */*",
       "Host: localhost",
       "Connection: Keep-Alive",
       "X-Forwarded-For: 127.0.0.1",
   },
   worker = 0x7f0ab04eda20 {
     ws = 0x7f0ab04edcf0 {
       id = "wrk",
       {s,f,r,e} = {0x7f0ab04db9d0,+8744,(nil),+65536},
     },
     http[bereq] = {
       ws = 0x7f0ab04edcf0[wrk]
         "GET",
         "/esi.html?1",
         "HTTP/1.1",
         "User-Agent: Wget/1.13 (linux-gnu)",
         "Accept: */*",
         "Host: localhost",
         "X-Forwarded-For: 127.0.0.1",
         "X-Varnish: 1795924191",
         "Accept-Encoding: gzip",
     },
     http[beresp] = {
       ws = 0x7f0ab04edcf0[wrk]
         "HTTP/1.1",
         "200",
         "OK",
         "Date: Mon, 24 Oct 2011 11:19:05 GMT",
         "Server: Apache/2.2.21 (Debian)",
         "Last-Modified: Mon, 24 Oct 2011 11:19:01 GMT",
         "ETag: "8807fe-100021-4b00997054d78"",
         "Accept-Ranges: bytes",
         "Vary: Accept-Encoding",
         "Content-Encoding: gzip",
         "Transfer-Encoding: chunked",
         "Content-Type: text/html",
     },
     },
     vcl = {
       srcname = {
         "input",
         "Default",
       },
     },
   obj = 0x7f0aaf3b3000 {
     xid = 1795924191,
     ws = 0x7f0aaf3b3018 {
       id = "obj",
       {s,f,r,e} = {0x7f0aaf3b3200,+280,(nil),+336},
     },
     http[obj] = {
       ws = 0x7f0aaf3b3018[obj]
         "HTTP/1.1",
         "OK",
         "Date: Mon, 24 Oct 2011 11:19:05 GMT",
         "Server: Apache/2.2.21 (Debian)",
         "Last-Modified: Mon, 24 Oct 2011 11:19:01 GMT",
         "ETag: "8807fe-100021-4b00997054d78"",
         "Vary: Accept-Encoding",
         "Content-Encoding: gzip",
         "Content-Type: text/html",
     },
     len = 131072,
     store = {
       131072 {
         1f 8b 08 00 00 00 00 00 00 03 02 00 00 00 ff ff |................|
         b2 49 2d ce b4 ca cc 4b ce 29 4d 49 55 28 2e 4a |.I-....K.)MIU(.J|
         b6 55 d7 07 8a 18 e9 65 94 e4 e6 a8 2b e8 db 01 |.U.....e....+...|
         00 00 00 ff ff 00 0d 40 f2 bf 0a a3 5f 15 87 e2 |....... at ...._...|
         [131008 more]
       },
     },
   },
 },

 }}}

 The assert occured right after I enabled mod_deflate on the backend. I've
 been unable to reproduce it.

-- 
Ticket URL: <https://www.varnish-cache.org/trac/ticket/1037>
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