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DescriptionMichael Hebenstreit
2011-06-20 21:48:09 UTC
Description of problem: after compiling a kernel from scratch some debug information is missing.
Version-Release number of selected component (if applicable):
gcc-4.4.5-6.el6.x86_64
libgcc-4.4.5-6.el6.x86_64
binutils-2.20.51.0.2-5.20.el6.x86_64
How reproducible: reproduced with kernel sources for RH6.1 linux-2.6.32-131.0.15.el6.x86_64, and vanilla linux-2.6.32.41 and linux-2.6.39.1; it worked with RH5.4
Steps to Reproduce:
1. take a kernel source
2. set "compile with debug infos", compile,
3. start gdb, try "l setup_arch"
Actual results:
[mhebenst@et19 linux-2.6.32.41]$ gdb vmlinux
GNU gdb (GDB) Red Hat Enterprise Linux (7.2-48.el6)
...
Reading symbols from /panfs/panfs2/home2/mhebenst/development/linux-2.6.32.41/vmlinux...done.
(gdb) l setup_arch
No line number known for setup_arch.
Expected results:
[mhebenst@eln1 linux-2.6.32.41]$ gdb vmlinux
GNU gdb Fedora (6.8-37.el5)
...
This GDB was configured as "x86_64-redhat-linux-gnu"...
(gdb) l setup_arch
716 *
717 * Note: On x86_64, fixmaps are ready for use even before this is called.
718 */
719
720 void __init setup_arch(char **cmdline_p)
721 {
722 #ifdef CONFIG_X86_32
723 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
724 visws_early_detect();
725 #else
(gdb) quit
Additional info: as mentioned compiling on RH5.4 does not show this problem; the gdb version is also not the issue - after compiling on RH5.4 both 6.8 and 7.2 versions of gdb see the function correctly
Reassigning temporarily to gdb for analysis, this might be a gdb bug but also a gcc bug, though nothing obvious has been spotted in the generated debug info yet.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
http://rhn.redhat.com/errata/RHBA-2011-1523.html
Description of problem: after compiling a kernel from scratch some debug information is missing. Version-Release number of selected component (if applicable): gcc-4.4.5-6.el6.x86_64 libgcc-4.4.5-6.el6.x86_64 binutils-2.20.51.0.2-5.20.el6.x86_64 How reproducible: reproduced with kernel sources for RH6.1 linux-2.6.32-131.0.15.el6.x86_64, and vanilla linux-2.6.32.41 and linux-2.6.39.1; it worked with RH5.4 Steps to Reproduce: 1. take a kernel source 2. set "compile with debug infos", compile, 3. start gdb, try "l setup_arch" Actual results: [mhebenst@et19 linux-2.6.32.41]$ gdb vmlinux GNU gdb (GDB) Red Hat Enterprise Linux (7.2-48.el6) ... Reading symbols from /panfs/panfs2/home2/mhebenst/development/linux-2.6.32.41/vmlinux...done. (gdb) l setup_arch No line number known for setup_arch. Expected results: [mhebenst@eln1 linux-2.6.32.41]$ gdb vmlinux GNU gdb Fedora (6.8-37.el5) ... This GDB was configured as "x86_64-redhat-linux-gnu"... (gdb) l setup_arch 716 * 717 * Note: On x86_64, fixmaps are ready for use even before this is called. 718 */ 719 720 void __init setup_arch(char **cmdline_p) 721 { 722 #ifdef CONFIG_X86_32 723 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data)); 724 visws_early_detect(); 725 #else (gdb) quit Additional info: as mentioned compiling on RH5.4 does not show this problem; the gdb version is also not the issue - after compiling on RH5.4 both 6.8 and 7.2 versions of gdb see the function correctly