[Varnish] #1746: Assertion failure "start > 0 && start < olen * 8" in ved_stripgzip(), cache/cache_esi_deliver.c (rev 15773a9)

[Varnish]

#1746: Assertion failure "start > 0 && start < olen * 8" in ved_stripgzip(),
cache/cache_esi_deliver.c (rev 15773a9)
-------------------+----------------------
 Reporter:  geoff  |       Type:  defect
   Status:  new    |   Priority:  normal
Milestone:  Later  |  Component:  varnishd
  Version:  trunk  |   Severity:  normal
 Keywords:         |
-------------------+----------------------
 Testing a trunk build, rev 15773a9 built on Friday May 29th, this
 assertion failure is reproducible:

 {{{
 #2  0x000000000043cb24 in pan_ic (func=0x4826c0 "ved_stripgzip",
     file=0x48238e "cache/cache_esi_deliver.c", line=466,
     cond=0x4825af "start > 0 && start < olen * 8", err=0, kind=VAS_ASSERT)
     at cache/cache_panic.c:574
 #3  0x000000000041db86 in ved_stripgzip (req=0x2b56cc60a020)
     at cache/cache_esi_deliver.c:466
 #4  0x000000000041e4bc in ESI_DeliverChild (req=0x2b56cc60a020, bo=0x0)
     at cache/cache_esi_deliver.c:631
 }}}

 From the panic messages and varnishlogs we've seen so far, it seems to
 have been an ESI-included 204 No content response in every case.

 I'll attach a full stack trace. We can't post the panic message publicly,
 but I can send one separately if needed.

-- 
Ticket URL: <https://www.varnish-cache.org/trac/ticket/1746>
Varnish <https://varnish-cache.org/>
The Varnish HTTP Accelerator