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Date: Wed, 24 Jun 2009 14:38:00 -0000
From: "grant dot b dot edwards at gmail dot com" <sourceware-bugzilla@sourceware.org>
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Message-ID: <20090624143827.10328.grant.b.edwards@gmail.com>
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Subject: [Bug gdb/10328] New: 6.8 broken for ARM targets (no backtrace, SIG32, etc.)
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X-SW-Source: 2009-q2/txt/msg00192.txt.bz2

Gdb 6.8 just plain doesn't work on ARM targets.  If a program
is stopped in anything other than user-code (e.g. it's blocked
in read() or accept() there's no backtrace.  If the application
is multi-threaded you see SIG32 messages. There are also
reports of other odd behavior. Using 6.7.1 instead of 6.8
results in everything working.

http://news.gmane.org/find-root.php?message_id=%3ch1omae%24i07%241%40ger.gmane.org%3e
http://news.gmane.org/find-root.php?message_id=%3ch1pgtf%24oc2%241%40ger.gmane.org%3e
http://news.gmane.org/find-root.php?message_id=%3ch1p5br%2411r%241%40ger.gmane.org%3e

If you do a bit of searching you can find various other reports
that 6.8 doesn't work on ARM and 6.7.1 works fine.

My guess is that the problem underlying all of this is gdb's
failure to figure out what library files are mapped.  See the
second link above for an example, but when you compare the
output of "info files" to that of /proc/<pid>/maps, you'll see
that library files (such as libc and libpthread) show up in the
/proc/<pid>/maps but not in "info files".  My guess is that
causes the lack of backtrace, the SIG32, and all the other
problems that people see on ARM using 6.8.

-- 
           Summary: 6.8 broken for ARM targets (no backtrace, SIG32, etc.)
           Product: gdb
           Version: 6.8
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: gdb
        AssignedTo: unassigned at sourceware dot org
        ReportedBy: grant dot b dot edwards at gmail dot com
                CC: gdb-prs at sourceware dot org
  GCC host triplet: i386-pc-linux-gnu
GCC target triplet: arm-linux-uclibc


http://sourceware.org/bugzilla/show_bug.cgi?id=10328

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