Description of problem: Just before some syscalls, one or more registers used to pass parameters to the kernel are pushed onto the stack in order to restore their values after the call returns. After you do 'stepi' over one of these pushes, 'backtrace' produces incorrect output. How wrong seems to depend on undetermined circumstances. We've seen frame #1 be corrupt. We seen ?? as frame #0 and missing frames. Version-Release number of selected component (if applicable): 5.3post-0.20021129.18 5.3.90-0.20030710.21 (Rawhide) How reproducible: Always Steps to Reproduce: 1. Run gdb for uploaded test program (source attached also) 2. Set breakpoint on read 3. Run until breakpoint 4. Do 'disass' to get the assembly for the function 5. Do 'stepi' until just before the push %ebx 6. Do 'bt' 7. Do 'stepi' 8. Do 'bt'. Notice difference compared to last backtrace. Actual results: Different backtrace between steps 6 and 8. Expected results: Same backtrace between steps 6 and 8. Additional info: Uploaded source, binary, and gdb capture.
Created attachment 94925 [details] Source of test program
Created attachment 94926 [details] Binary of test program
Created attachment 94927 [details] Capture from gdb session
Red Hat apologizes that these issues have not been resolved yet. We do want to make sure that no important bugs slip through the cracks. Red Hat Linux 7.3 and Red Hat Linux 9 are no longer supported by Red Hat, Inc. They are maintained by the Fedora Legacy project (http://www.fedoralegacy.org/) for security updates only. If this is a security issue, please reassign to the 'Fedora Legacy' product in bugzilla. Please note that Legacy security update support for these products will stop on December 31st, 2006. If this is not a security issue, please check if this issue is still present in a current Fedora Core release. If so, please change the product and version to match, and check the box indicating that the requested information has been provided. If you are currently still running Red Hat Linux 7.3 or 9, please note that Fedora Legacy security update support for these products will stop on December 31st, 2006. You are strongly advised to upgrade to a current Fedora Core release or Red Hat Enterprise Linux or comparable. Some information on which option may be right for you is available at http://www.redhat.com/rhel/migrate/redhatlinux/. Any bug still open against Red Hat Linux 7.3 or 9 at the end of 2006 will be closed 'CANTFIX'. Again, if this bug still exists in a current release, or is a security issue, please change the product as necessary. We thank you for your help, and apologize again that we haven't handled these issues to this point.
Red Hat Linux 7.3 and Red Hat Linux 9 are no longer supported by Red Hat, Inc. f you are currently still running Red Hat Linux 7.3 or 9, you are strongly advised to upgrade to a current Fedora Core release or Red Hat Enterprise Linux or comparable. Some information on which option may be right for you is available at http://www.redhat.com/rhel/migrate/redhatlinux/. Closing as CANTFIX.