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Re: [RFC/ia64] memory error when reading wrong core file
- From: Jan Kratochvil <jan dot kratochvil at redhat dot com>
- To: Joel Brobecker <brobecker at adacore dot com>
- Cc: gdb-patches at sourceware dot org
- Date: Fri, 29 Jan 2010 18:51:33 +0100
- Subject: Re: [RFC/ia64] memory error when reading wrong core file
- References: <20100129160222.GL26811@adacore.com>
Hi Joel,
On Fri, 29 Jan 2010 17:02:22 +0100, Joel Brobecker wrote:
> Contrast this with what we get today, on ia64-linux:
>
> (gdb) core core
> warning: core file may not match specified executable file.
> [New Thread 5437]
> Cannot access memory at address 0x1000000000009
>
> The change of behavior is related to a patch that changed the way
> the solib base address gets computed (that was for PIE, patch 12/15
> I believe). Prior to that patch, the computed base address was zero.
before verifying your patch I would like to check if the PIE change should not
be rather somehow fixed. Unfortunately I am unable to reproduce the problem
on ia64 (RHEL-5.4) GDB HEAD (ea72145d5db8c66253c9b21b785a5311f69ae99e).
GNU gdb (GDB) 7.0.50.20100129-cvs
This GDB was configured as "ia64-unknown-linux-gnu".
Reading symbols from /root/.../pause...done.
[New Thread 30776]
warning: Can't read pathname for load map: Input/output error.
Reading symbols from /lib/libc.so.6.1...(no debugging symbols found)...done.
Loaded symbols for /lib/libc.so.6.1
Reading symbols from /lib/ld-linux-ia64.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/ld-linux-ia64.so.2
Core was generated by `./pause'.
Program terminated with signal 11, Segmentation fault.
#0 0xa000000000010620 in __kernel_syscall_via_break ()
(gdb)
Could you please provide some binary/core file as reproducers?
Thanks,
Jan