varnishd panic message

[Paulo Paracatu]

Hello,

I was monitoring my messages log and varnish is producing a lot of "panic
messages" like this one:
Sep 13 12:43:18 cache5 varnishd[970965]: Child (987439) died signal=6
Sep 13 12:43:18 cache5 varnishd[970965]: Child (987439) Panic message:
Assert error in Tcheck(), cache.h line 977:   Condition((t.b) != 0) not
true. thread = (cache-worker) ident =
Linux,2.6.18-238.9.1.el5.centos.plus,x86_64,-smalloc,-smalloc,-hcritbit,epoll
Backtrace:   0x42cea6: /usr/sbin/varnishd [0x42cea6]   0x4284ef:
/usr/sbin/varnishd [0x4284ef]   0x4304d5:
/usr/sbin/varnishd(RES_BuildHttp+0x85) [0x4304d5]   0x416f3b:
/usr/sbin/varnishd [0x416f3b]   0x417e0b:
/usr/sbin/varnishd(CNT_Session+0x7fb) [0x417e0b]   0x42f698:
/usr/sbin/varnishd [0x42f698]   0x42e87b: /usr/sbin/varnishd [0x42e87b]
0x34aa40673d: /lib64/libpthread.so.0 [0x34aa40673d]   0x34a90d44bd:
/lib64/libc.so.6(clone+0x6d) [0x34a90d44bd] sp = 0x2aaae2d02008 {   fd =
1296, id = 1296, xid = 910121180,   client = 72.232.146.20 58870,   step =
STP_PREPRESP,   handling = deliver,   restarts = 0, esi_level = 0   flags =
   bodystatus = 4   ws = 0x2aaae2d02080 {      id = "sess",     {s,f,r,e} =
{0x2aaae2d02cd0,+1248,(nil),+65536},   },   http[re
Sep 13 12:43:18 cache5 varnishd[970965]: child (987541) Started
Sep 13 12:43:18 cache5 varnishd[970965]: Child (987541) said Child starts

Does anyone know why is this happening?

I'm using:
[root at cache5 tmp]# varnishd -V
varnishd (varnish-trunk revision 71ee192)
Copyright (c) 2006 Verdens Gang AS
Copyright (c) 2006-2011 Varnish Software AS

With IMS experimental branch

Thanks
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