[Varnish] #1376: Child crash due to a bad file descriptor / socket with esi_level > 0

[Varnish]

#1376: Child crash due to a bad file descriptor / socket with esi_level > 0
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 Reporter:  centur                     |       Type:  defect
   Status:  new                        |   Priority:  normal
Milestone:                             |  Component:  varnishd
  Version:  3.0.4                      |   Severity:  normal
 Keywords:  esi, panic, child restart  |
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 Since we updated from varnish 3.0.3 to 3.0.4 the varnish child crashes
 every 1-3 days in our production system with the following panic message:
 Panic message: Assert error in VRT_r_server_ip(), cache_vrt_var.c line
 473:0000012 Condition(VTCP_Check(i)) not true.#012errno = 9 (Bad file
 descriptor). The panic occurs only with esi_level > 0. We cannot reproduce
 the problem with certain conditions, it appears randomly.

 I had a look in the varnish source files, the crash occurs in the function
 getsockname(int sockfd, struct sockaddr *addrsocklen_t *" addrlen ),
 obviously failing due to an bad file descriptor.

 Our OS:
 Linux version 3.2.0-4-amd64 (debian-kernel at lists.debian.org) (gcc version
 4.6.3 (Debian 4.6.3-14) ) #1 SMP Debian 3.2.51-1 (Linux Wheezy)

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1376>
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