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external/1737: Can not set breakpoints in the vsyscall page

From: dan at debian dot org
To: gdb-gnats at sources dot redhat dot com
Date: 8 Aug 2004 21:52:34 -0000
Subject: external/1737: Can not set breakpoints in the vsyscall page
Reply-to: dan at debian dot org

>Number:         1737
>Category:       external
>Synopsis:       Can not set breakpoints in the vsyscall page
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    unassigned
>State:          open
>Class:          external
>Submitter-Id:   net
>Arrival-Date:   Sun Aug 08 21:58:01 UTC 2004
>Closed-Date:
>Last-Modified:
>Originator:     dan@debian.org
>Release:        2004-08-08-cvs
>Organization:
>Environment:
i686-pc-linux-gnu
>Description:
The Linux kernel does not allow breakpoints to be set in the vsyscall page (used for system calls and signal trampolines).

One result is that "finish" does not work from signal handlers.  This causes failures in sigaltstack.exp.  This may be fixed in Fedora's kernel:
  http://sources.redhat.com/ml/gdb/2004-05/msg00023.html

It is not fixed in at least 2.6.5 and 2.6.8-rc2 sources.
>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:

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