On Mon, 2009-01-05 at 11:08 -0800, mehul vora wrote: > Adam, > > I tried that, but gdb receives SIGSEGV immediately after calling > "munmap"... GDB shows the fault address as a "next to `munmap` jump > instruction". I took objdump of the image to > confirm this. > > But i believe, program is getting an exception while returning > from munmap syscall. As > it tries to jump back to the user space address, but doesn't find any > valid tlb / page table > entry and it takes a invalid fault.. > > I am still not able to understand that how any architecture would > allow access to any > "unmapped" segment without any page table / tlbs info ? Is the > "constructor" code in > libhugetlbfs sits under any specific segment other than ".text" which > is never unmapped ?? > > Since libhugetlbfs is a library, it has it's own text and data > segments (independent of the program). So the library code runs > uninhibited since only the program segments (not the library segments) > are unmapped. > > > thanks, > Mehul. > > > > --- On Mon, 1/5/09, Adam Litke <a...@us.ibm.com> wrote: > From: Adam Litke <a...@us.ibm.com> > Subject: Re: [Libhugetlbfs-devel] Lib hugetlbfs > To: mehu...@yahoo.com > Cc: "Nishanth Aravamudan" <n...@us.ibm.com>, > libhugetlbfs-devel@lists.sourceforge.net > Date: Monday, January 5, 2009, 12:40 PM > > On Mon, 2009-01-05 at 10:25 -0800, mehul vora wrote: > > > > Adam, > > > > I just commented out printfs, but still program gets a seg fault. I > > have a tight loop after "munmap", so ideally program should > never come > > out, but for me program gets a SIGSEGV after first munmap.... > > > > Could you run your program in gdb and determine the address that is > > causing the segfault? You could compare that address to `readelf > -e` > > and `nm` output for your binary to better determine the nature of > the > > error. > > > > >
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