[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] vfree crash
> -----Original Message----- > From: Petre Ovidiu PIRCALABU <ppircalabu@xxxxxxxxxxxxxxx> > Sent: 01 July 2019 09:46 > To: Paul Durrant <Paul.Durrant@xxxxxxxxxx>; xen-devel@xxxxxxxxxxxxxxxxxxxx; > Andrew Cooper > <Andrew.Cooper3@xxxxxxxxxx> > Cc: Alexandru Stefan ISAILA <aisaila@xxxxxxxxxxxxxxx>; > rcojocaru@xxxxxxxxxxxxxxx > Subject: Re: vfree crash > > On Mon, 2019-07-01 at 08:29 +0000, Paul Durrant wrote: > > > -----Original Message----- > > > From: Xen-devel <xen-devel-bounces@xxxxxxxxxxxxxxxxxxxx> On Behalf > > > Of Petre Ovidiu PIRCALABU > > > Sent: 28 June 2019 19:00 > > > To: xen-devel@xxxxxxxxxxxxxxxxxxxx; Andrew Cooper < > > > Andrew.Cooper3@xxxxxxxxxx> > > > Cc: Alexandru Stefan ISAILA <aisaila@xxxxxxxxxxxxxxx>; > > > rcojocaru@xxxxxxxxxxxxxxx > > > Subject: [Xen-devel] vfree crash > > > > > > Hello, > > > > > > I need your help to pinpoint the root cause of a problem. To my > > > understanding vfree should be used when allocating memory with > > > vmalloc. > > > > > > But, I have the following scenario which results in a XEN crash: > > > - allocate a number of frames using vmalloc (vzalloc) (e.g. using a > > > domctl) and assign them to the calling domain > > > - map the frames using xenforeignmemory_map_resource > > > > Do you really mean xenforeignmemory_map_resource()? If the memory is > > assigned to the calling domain then this is quite likely not to work. > > There were reference counting problems with that code, which is why > > caller assigned resources were dropped. > > > > Paul > > > > The problem lies with vfree because it creates a new list with the > pages, unmaps the va pointer and then frees the pages. If I do these > steps manually (without adding them to a new list) it works. So, looking at the code, I don't think it is intended that v[m|z]alloced pages get assigned to a domain. Could you point at where the assignment is happening? Paul > > Many thanks, > Petre > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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