Bug 20980
| Summary: | There appears to be some kind of 'buffer overrun' problem with gnome-terminals and xterms when executing lots of printf() statements | ||||||||
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| Product: | [Retired] Red Hat Linux | Reporter: | Need Real Name <todds> | ||||||
| Component: | XFree86 | Assignee: | Mike A. Harris <mharris> | ||||||
| Status: | CLOSED CURRENTRELEASE | QA Contact: | |||||||
| Severity: | high | Docs Contact: | |||||||
| Priority: | high | ||||||||
| Version: | 6.2 | CC: | dr | ||||||
| Target Milestone: | --- | ||||||||
| Target Release: | --- | ||||||||
| Hardware: | i386 | ||||||||
| OS: | Linux | ||||||||
| Whiteboard: | |||||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||||
| Doc Text: | Story Points: | --- | |||||||
| Clone Of: | Environment: | ||||||||
| Last Closed: | 2001-05-12 13:16:52 UTC | Type: | --- | ||||||
| Regression: | --- | Mount Type: | --- | ||||||
| Documentation: | --- | CRM: | |||||||
| Verified Versions: | Category: | --- | |||||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||||
| Embargoed: | |||||||||
| Attachments: |
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Description
Need Real Name
2000-11-16 21:02:24 UTC
If you can, please provide a minimal amount of code that triggers this, and any specific test conditions so that the problem can be replicated easily for testing. I'll try to untangle the current client/server source code into a stand alone module that I can actually email to you that doesn't contain any proprietary code, but I'm buried right now and probably won't get to it until after Thanksgiving/next week. My guess is you could just write a while loop with a counter and printf statement in it. I have developed a compact stand alone software application that reproduces the problem. I will email the source code and Makefile as a 'tar.gz' file to 'mharris'. Mike, can you please compile the application and run it on your machine and verify that you are able to reproduce the problem as soon as possible? Thanks, Todd Has any progress been made on this bug report??? It is really interfering with my development efforts. I have also tried version 2.2.18 non-SMP kernel and the problem still occurs. I must have lost the file you sent me for testing - which is why bugzilla has a file attachment feature. We do not accpet bug reports via mail for this very reason - that when the mail comes in, and when the bug gets looked at are not necessarily the same time. As a result, the mail gets buried/lost and there is nothing to tie the email to the bug report. Attach a new copy to the bug report with the "Create a new attachment" link above, and I'll be glad to look into the problem. You might also want to give the latest XFree release from rawhide a shot to see if it fixes the problem. Created attachment 9962 [details]
application to reproduce the kernel printf() problem
Created attachment 9963 [details]
resend of application to reproduce the kernel printf() problem
Please use the 9963 attachment as I was having web problems/submit problems when I submitted the 9962 attachment. You can delete the 9962 attachment as I couldn't figure out how to. For some reason the attachment I submitted shows up as 'showattachment.cgi' instead of 'printf_problem.tar.gz' when you go to download it. You can still extract the files that make up the application that reproduces the problem by running the following command: 'zcat showattachment.cgi | tar xvf -' This command will create a directory called 'printf_problem'. Simply 'cd printf_problem' and run 'make'. Use ./main to run the program. You should see something like the following: Before fcntl() - line #0490 Before fcntl() - line #0491 Before fcntl() - line #0492 Before fcntl() - line #0493 Before fcntl() - line #0494 Before fcntl() - line #0495 Before fcntl() - line #0496 Before fcntl() - line #0497 Before fcntl() - line #0498 Before fcntl() - line #0499 After fcntl( O_NONBLOCK ) - line #0000 After fcntl( O_NONBLOCK ) - line #0001 After fcntl( O_NONBLOCK ) - line #0002 After fcntl( O_NONBLOCK ) - line #0003 After fcntl( O_NONBLOCK ) - line #0004 After fcntl( O_NONBLOCK ) - line #0005 After fcntl( O_NONBLOCK ) - line #0006 After fcntl( O_NONBLOCK ) - line #0007 After fcntl( O_NONBLOCK ) - line #0008 After fcntl( O_NONBLOCK ) - line #0009 After fcntl( O_NON This is where lines 10-500 are dropped! I'm defering this to my todo list so it gets looked into sooner. I have tried to reproduce this on several installations using xterm, gnome-terminal, and konsole. In every case the program works as one would expect it to. I will be making an errata release of 3.3.6 for RHL 6.2 soon, which you can try: ftp://people.redhat.com/mharris/testing/6.2 If that doesn't work for you, then it is either something wrong with your local installation, or is a legitimate bug that I can't reproduce. At any rate it is not present in Red Hat Linux 7.0 or 7.1, so my recommendation is to upgrade to Red Hat Linux 7.1 if the problem persists. |