Re: Repeatable ways to crash the MathKernel

*To*: mathgroup at smc.vnet.net*Subject*: [mg116091] Re: Repeatable ways to crash the MathKernel*From*: David Reiss <dbreiss at gmail.com>*Date*: Tue, 1 Feb 2011 06:55:37 -0500 (EST)*References*: <ii5rka$fjh$1@smc.vnet.net>

And have you reported this to support at wolfarm.com? Please do. On Jan 31, 3:24 am, Alexander <alexander_elk... at hotmail.com> wrote: > The first two sequences are repeatable with > $System=="Microsoft Windows (32-bit)" (sometimes the crash happens > when Plot3D is evaluated as In[1] after the intial startup before any > crash has happened): > > 1) The following sequence works on versions 5.2.0.0(has no > exclusions), > 6.0.3.0 & 7.0.1.0 but crashes version 8.0.0.0 of the kernel: > > In[1]:= Plot3D[Im[Log[((x+I*y)^2-Pi^2)^2]],{x,-2Pi,2Pi},{y,-2Pi,2Pi}] > Out[1]=...(output not shown here) > > In[2]:= ?Plot3D > ...(output not shown here) > > In[3]:= Plot3D[Im[Log[((x+I*y)^2-Pi^2)^2]],{x,-2Pi,2Pi},{y,-2Pi,2Pi}] > > After a few seconds the kernel crashes... > > 2) The following sequence works on versions 5.2.0.0(has no > exclusions), > 6.0.3.0 & 7.0.1.0 but crashes version 8.0.0.0 of the kernel: > > In[1]:= Plot3D[Piecewise[{{Im[Log[((x+I*y)^2-Pi^2)^2]],x^2-y^2! > =Pi^2}}], > {x,-2Pi,2Pi},{y,-2Pi,2Pi},Mesh->False] > Out[1]=...(output not shown here) > > In[2]:= ?Plot3D > ...(output not shown here) > > In[3]:= Plot3D[Piecewise[{{Im[Log[((x+I*y)^2-Pi^2)^2]],x^2-y^2! > =Pi^2}}], > {x,-2Pi,2Pi},{y,-2Pi,2Pi},Mesh->False] > > After a few seconds the kernel crashes... > > 3) The following line always crashes versions 5.2.0.0, 6.0.3.0, > 7.0.1.0 > & 8.0.0.0 of the kernel: > > FullSimplify[Limit[-(1/2)Log[1/#]-Log[I#]+Log[#]/2&[Complex[y,y]], > y->0]==-I*Pi/2] > > The following works (changed Complex[y,y] to y+I*y): > > FullSimplify[Limit[-(1/2)Log[1/#]-Log[I#]+Log[#]/2&[y+I*y], > y->0]==-I*Pi/2] > > Anyone else see this happen?