Feb 22 15:11:06 cp5001 varnishd[8902]: Child (15010) Panic at: Thu, 22 Feb 2018 15:11:06 GMT
                                       Assert error in child_sigsegv_handler(), mgt/mgt_child.c line 271:
                                         Condition(Segmentation fault by instruction at (nil)) not true.
                                       version = varnish-5.1.3 revision NOGIT, vrt api = 6.0
                                       ident = Linux,4.9.0-0.bpo.5-amd64,x86_64,-junix,-smalloc,-smalloc,-hcritbit,epoll
                                       now = 811992.408764 (mono), 1519312266.409070 (real)
                                       Backtrace:
                                         0x439665: /usr/sbin/varnishd() [0x439665]
                                         0x465bda: /usr/sbin/varnishd() [0x465bda]
                                         0x7f7c2c87d890: /lib/x86_64-linux-gnu/libpthread.so.0(+0xf890) [0x7f7c2c87d890]
                                         0x7f7c1bdcc384: ./vmod_cache/_vmod_netmapper.DQDUKHATYYOESBIV@D@GOQXNE@OUMBDW(vnm_db_destruct+0x4) [0x7f7c1bdcc384]
                                         0x7f7c1bdcbe4c: ./vmod_cache/_vmod_netmapper.DQDUKHATYYOESBIV@D@GOQXNE@OUMBDW(+0x1e4c) [0x7f7c1bdcbe4c]
                                         0x7f7c1c81c9aa: vcl_vcl-root-b616d117-c328-4190-9c5e-609f77820563.1519174932.480899096/vgc.so(+0x89aa) [0x7f7c1c81c9aa]                                                                                                                                                             
                                         0x445694: /usr/sbin/varnishd() [0x445694]                                                                            
                                         0x448991: /usr/sbin/varnishd(VCL_Poll+0x111) [0x448991]                                                              
                                         0x4819fa: /usr/sbin/varnishd() [0x4819fa]                                                                            
                                         0x481d67: /usr/sbin/varnishd() [0x481d67]                                                                            
                                       thread = (cache-main)                                                                                                  
                                       thr.req = (nil) {                                                                                                      
                                       },                                                                                                                     
                                       thr.busyobj = (nil) {                                                                                                  
                                       },