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[Bug gdb/14585] New: "Error accessing memory address" when creatingJIT internal breakpoint
- From: "sergiodj at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: gdb-prs at sourceware dot org
- Date: Fri, 14 Sep 2012 19:41:22 +0000
- Subject: [Bug gdb/14585] New: "Error accessing memory address" when creatingJIT internal breakpoint
- Auto-submitted: auto-generated
http://sourceware.org/bugzilla/show_bug.cgi?id=14585
Bug #: 14585
Summary: "Error accessing memory address" when creating JIT
internal breakpoint
Product: gdb
Version: HEAD
Status: NEW
Severity: normal
Priority: P2
Component: gdb
AssignedTo: unassigned@sourceware.org
ReportedBy: sergiodj@redhat.com
Classification: Unclassified
I could not find an easy way to reproduce this bug so far. The only way I
managed to do so was to:
1) git clone git://git.qemu.org/qemu.git
2) ./configure --enable-kvm --python=python2 --target-list=x86_64-softmmu
--disable-uuid --disable-werror --enable-debug --enable-fdt # you will need to
install the dependencies
3) gdb -q -ex 'run' /tmp/install-qemu/bin/qemu-system-x86_64
And you will see:
Warning:
Cannot insert breakpoint -1.
Error accessing memory address 0x34e96c: Input/output error.
Running git-bisect on gdb.git, I found the culprit as being:
a7262466d02155f5f70422804e5971f8d5e78118 is the first bad commit
commit a7262466d02155f5f70422804e5971f8d5e78118
Author: Tom Tromey <tromey@redhat.com>
Date: Wed Feb 1 20:21:21 2012 +0000
I spent some hours debugging this problem, and apparently it happens because
the JIT code does not recreate its internal breakpoint (placed on
__jit_debug_register_code) when the inferior is created. Somehow the
breakpoint address does not get relocated and is invalid when
insert_breakpoint_locations tries to reinsert it.
This happens on x86_64, confirmed on Fedora 17 and ArchLinux.
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