Assert error in ban_lurker_getfirst()

[Hugues Alary]

Hi there,

Today the varnish child panicked:

varnish> panic.show
200
Panic at: Tue, 17 Jul 2018 23:24:28 GMT
Assert error in ban_lurker_getfirst(), cache/cache_ban_lurker.c line 177:
  Condition((oc->flags & OC_F_BUSY) == 0) not true.
version = varnish-6.0.0 revision a068361dff0d25a0d85cf82a6e5fdaf315e06a7d,
vrt api = 7.0
ident = Linux,4.14.22+,x86_64,-junix,-smalloc,-sdefault,-hcritbit,epoll
now = 582423.461242 (mono), 1531869856.455080 (real)
Backtrace:
  0x561f9e331957: varnishd(+0x4a957) [0x561f9e331957]
  0x561f9e396730: varnishd(VAS_Fail+0x40) [0x561f9e396730]
  0x561f9e3154e9: varnishd(ban_lurker+0xba9) [0x561f9e3154e9]
  0x561f9e350747: varnishd(+0x69747) [0x561f9e350747]
  0x7fb783eda494: /lib/x86_64-linux-gnu/libpthread.so.0(+0x7494)
[0x7fb783eda494]
  0x7fb783c1cacf: /lib/x86_64-linux-gnu/libc.so.6(clone+0x3f)
[0x7fb783c1cacf]
errno = 110 (Connection timed out)
thread = (ban-lurker)
thr.req = (nil) {
},
thr.busyobj = (nil) {
},

Any idea about what could have happened?

Cheers,
-Hugues
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