<div dir="ltr"><div>Recently, my varnish boxes have been seeing panics.  I don't know why.  vmod redis, mhash, and digest are in play (with the worst suspect being vmod_redis).<br><br>Last panic at: Fri, 21 Nov 2014 17:16:55 GMT                                                                                                                              [92/197]<br>Assert error in VRT_SetHdr(), cache_vrt.c line 225:<br>  Condition((sp)->magic == 0x2c2f9c5a) not true.<br>thread = (cache-worker)<br>ident = Linux,3.4.68-59.97.amzn1.x86_64,x86_64,-smalloc,-smalloc,-hcritbit,epoll<br>Backtrace:<br>  0x431095: /usr/sbin/varnishd() [0x431095]<br>  0x43938b: /usr/sbin/varnishd(VRT_SetHdr+0xab) [0x43938b]<br>  0x7f19ee9f2151: ./<a href="http://vcl.W6jYfrXC.so">vcl.W6jYfrXC.so</a>(+0x3151) [0x7f19ee9f2151]<br>  0x7f19ee9f2def: ./<a href="http://vcl.W6jYfrXC.so">vcl.W6jYfrXC.so</a>(+0x3def) [0x7f19ee9f2def]<br>  0x437f78: /usr/sbin/varnishd(VCL_recv_method+0x48) [0x437f78]<br>  0x41957b: /usr/sbin/varnishd(CNT_Session+0xf2b) [0x41957b]<br>  0x432d5a: /usr/sbin/varnishd() [0x432d5a]<br>  0x7f19f8930f18: /lib64/libpthread.so.0(+0x7f18) [0x7f19f8930f18]<br>  0x7f19f8666b9d: /lib64/libc.so.6(clone+0x6d) [0x7f19f8666b9d]<br>sp = 0x7f1951865008 {<br>  fd = 0, id = 0, xid = 0,<br>  client = ?.?.?.? ?,<br>  step = STP_WAIT,<br>  handling = deliver,<br>  restarts = 0, esi_level = 0<br>  flags =<br><br></div>Any pointers on where to start looking?<br></div>