<div dir="ltr"><div>Hello all,</div><div><br></div><div>I've just updated my (Centos 7.3) varnish to the latest stable version from 4.1.4 to 4.1.5 which resulted in the following:</div><div><br></div><div><div>Feb 22 09:15:17 varnish01 varnishd[13228]: Child (13230) not responding to CLI, killed it.</div><div>Feb 22 09:15:17 varnish01 varnishd[13228]: Unexpected reply from ping: 400 CLI communication error (hdr)</div><div>Feb 22 09:15:17 varnish01 varnishd[13228]: Child (13230) not responding to CLI, killed it.</div><div>Feb 22 09:15:17 varnish01 varnishd[13228]: Unexpected reply from ping: 400 CLI communication error</div><div>Feb 22 09:15:18 varnish01 varnishd[13228]: Child (13230) died signal=11</div><div>Feb 22 09:15:18 varnish01 varnishd[13228]: Child (13230) Last panic at: Wed, 22 Feb 2017 09:15:18 GMT#012"Wrong turn at cache/cache_session.c:551:#012Clock step detected#012thread = (cache-worker)#012version = varnish-4.1.5 revision 2c82b1c#012ident = Linux,3.10.0-514.6.1.el7.x86_64,x86_64,-junix,-smalloc,-smalloc,-hcritbit,epoll#012now = 702.656884 (mono), 1487754906.433703 (real)#012Backtrace:#012  0x434662: pan_ic+0x192#012  0x43c1e3: varnishd() [0x43c1e3]#012  0x436177:</div><div>Req_Cleanup+0x1f7#012  0x450bcd: HTTP1_Session+0xbd#012  0x43accd: SES_Proto_Req+0x5d#012  0x44b209: WRK_Thread+0x4c9#012  0x44b67b: pool_thread+0x2b#012  0x7fa3501dbdc5: libpthread.so.0(+0x7dc5) [0x7fa3501dbdc5]#012  0x7fa34ff0a73d: libc.so.6(clone+0x6d) [0x7fa34ff0a73d]#012req = 0x7fa2d4d41020 {#012  MAGIC 0x00000000 (Should:REQ_MAGIC/0x2751aaa1)#012  vxid = 0, step = R_STP_RESTART,#012  req_body = R_BODY_INIT,#012  restarts = 0, esi_level = 0,#012  ws = 0x7fa2d4d41200 {#012</div><div>  MAGIC 0x00000000 (Should:WS_MAGIC/0x35fac554)#012    id = \"\",#012    {s,f,r,e} = {(nil),(nil),(nil),(nil)},#012  },#012  http[req] = (nil) {#012"</div><div>Feb 22 09:15:18 varnish01 varnishd[13228]: Child cleanup complete</div><div>Feb 22 09:15:18 varnish01 varnishd[13228]: Child (11686) Started</div><div>Feb 22 09:15:18 varnish01 varnishd[13228]: Child (11686) said Child starts</div></div><div><br></div><div>Any help will be greatly appreciated!</div><div><br></div><div>Thanks in advance</div><div><br></div><div>PS. I've never had any similar problem with the previous version (4.1.4)</div><div><div class="gmail_signature"><table cellspacing="0" cellpadding="0" border="0" style="overflow:hidden;font-family:arial,helvetica,sans-serif">  <tbody><tr>      <td>          <div style="height:20px"> </div>      </td>  </tr>  <tr>      <td>          <table cellspacing="0" cellpadding="0" border="0">              <tbody><tr>                  <td style="border-right:3px solid rgb(26,96,168);padding-right:10px;min-height:72px">                      <img style="padding-top: 9px;" width="44" height="45" src="https://stoiximan.s3.amazonaws.com/email-signature/stoiximan_services/logo.png" alt="Stoiximan Logo">                  </td>                  <td style="padding-left:10px">                      <div style="font-size:16px;line-height:18px;color:rgb(26,96,168);font-weight:bold">Dimitris Magnis</div>                      <div style="font-size:13px;line-height:1em;color:rgb(37,51,64);padding:4px 0px">Junior Systems Administrator</div>                       <div style="display:block;overflow:hidden;min-height:15px;margin-top:5px">                          <a style="display:inline-block;width:15px;height:15px" href="https://www.facebook.com/stoiximan.gr" target="_blank">                                      <img width="15" height="15" style="display: block; border: 0px;" src="https://stoiximan.s3.amazonaws.com/email-signature/stoiximan/facebook.png">                                  </a>                                  <a style="display:inline-block;width:15px;height:15px;margin:0px 2px" href="http://twitter.com/stoiximan" target="_blank">                                      <img width="15" height="15" style="display: block; border: 0px;" src="https://stoiximan.s3.amazonaws.com/email-signature/stoiximan/twitter.png">                                  </a>                                  <a style="display:inline-block;width:15px;height:15px" href="https://www.instagram.com/stoiximan.gr/" target="_blank">                                      <img width="15" height="15" style="display: block; border: 0px;" src="https://stoiximan.s3.amazonaws.com/email-signature/stoiximan/instagram.png">                                  </a>                                  <a style="display:inline-block;width:15px;height:15px;margin:0px 2px" href="https://www.youtube.com/user/StoiximanTV/" target="_blank">                                      <img width="15" height="15" style="display: block; border: 0px;" src="https://stoiximan.s3.amazonaws.com/email-signature/stoiximan/youtube.png">                                  </a>                                  <a style="display:inline-block;width:15px;height:15px" href="https://www.linkedin.com/company/stoiximan-gr" target="_b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