From: Michael Snyder <Michael.Snyder@palmsource.com>
To: Rich Rattanni <rattanni@gmail.com>
Cc: gdb@sourceware.org
Subject: Re: Cause of the ?? in backtrace
Date: Tue, 13 Mar 2007 00:06:00 -0000 [thread overview]
Message-ID: <1173744387.11051.24.camel@localhost.localdomain> (raw)
In-Reply-To: <3187bd480703120747h332fbf12gab39d77719c910f9@mail.gmail.com>
On Mon, 2007-03-12 at 10:47 -0400, Rich Rattanni wrote:
> Why would one get the following when trying to do a backtrace in GDB...
> (gdb) bt
> #0 0x403cdcb4 in _int_malloc () from /lib/libc.so.6
> #1 0x403cedfc in malloc () from /lib/libc.so.6
> #2 0x401c4418 in sqlite3MallocRaw () from /usr/lib/libsqlite3.so.0
> #3 0x401c450c in sqlite3StrNDup () from /usr/lib/libsqlite3.so.0
> #4 0x401cc070 in sqlite3VdbeChangeP3 () from /usr/lib/libsqlite3.so.0
> #5 0x401cc0ac in sqlite3VdbeOp3 () from /usr/lib/libsqlite3.so.0
> #6 0x401ac010 in sqlite3CodeSubselect () from /usr/lib/libsqlite3.so.0
> #7 0x401ab4b0 in sqlite3ExprCode () from /usr/lib/libsqlite3.so.0
> #8 0x401abd00 in sqlite3ExprIfFalse () from /usr/lib/libsqlite3.so.0
> #9 0x401d02cc in sqlite3WhereBegin () from /usr/lib/libsqlite3.so.0
> #10 0x401bf13c in sqlite3Select () from /usr/lib/libsqlite3.so.0
> #11 0x401b6978 in sqlite3Parser () from /usr/lib/libsqlite3.so.0
> #12 0x401c12e0 in sqlite3RunParser () from /usr/lib/libsqlite3.so.0
> #13 0x47de97e0 in ?? () <------------------------------- This
> is my problem
Specifically, the ?? means that gdb could not find a symbol to
correspond with the instruction address 0x47de97e0. This might
mean any number of things.
If the address is legitimate (ie. the return address of sqlite3RunParser
really does point back to a caller at 0x47de97e0), then this caller
may be from a library for which gdb has no symbols. It might be
self-generating code, in which case it may never have had any
symbols.
Or the address may NOT be legitimate, and may have come about
as a result of a corrupted stack or something.
next prev parent reply other threads:[~2007-03-13 0:06 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-12 14:48 Rich Rattanni
2007-03-12 14:52 ` Daniel Jacobowitz
2007-03-13 0:06 ` Michael Snyder [this message]
2007-03-13 3:48 ` Rich Rattanni
2007-03-13 4:07 ` Joel Brobecker
2007-03-13 9:15 ` Andreas Schwab
2007-03-13 5:22 ` Bin Chen
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