Red Hat Bugzilla – Bug 141529
gdb on kernel module generates Dwarf Error
Last modified: 2007-11-30 17:07:15 EST
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Description of problem:
This problem was originally seen when using the crash utility,
(which has gdb embedded), when trying to do an "add-symbol-file"
operation on a RHEL4 kernel module.
However, the problem can easily be reproduced by simply running
gdb standalone on the kernel module file, which must have its
associated debuginfo file installed on the target system.
In the example below, the RHEL4 exportfs.ko kernel module causes gdb
to generate a "Dwarf Error: Could not find abbrev number 7218" error
message during initialization.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. On a system running RHEL4, determine the version with "uname -r",
and if not already installed, install the associated kernel debuginfo
2. cd /lib/modules/`uname -r`/kernel/fs/exportfs
3. gdb exportfs.ko
# gdb ./fs/exportfs/exportfs.ko
GNU gdb Red Hat Linux (6.1post-1.20040607.43rh)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and
you are welcome to change it and/or distribute copies of it under
certain conditions. Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for
details. This GDB was configured as "ia64-redhat-linux-gnu"...
Dwarf Error: Could not find abbrev number 7218 [in module
Should initialize with no errors.
This report was based upon the exportfs.ko module from the
2.6.9-1.648_EL kernel, which was compiled with:
(gcc version 3.4.2 20041017 (Red Hat 3.4.2-6.fc3))
Running the same test on the exportfs.ko module from
the 2.6.9-1.860_EL kernel, which was compiled with:
(gcc version 3.4.3 20041125 (Red Hat 3.4.3-6.EL4))
the error message is no longer exhibited.