Bug 64004
| Summary: | Bug shows up in raid1 component that appears to be a compiler bug | ||
|---|---|---|---|
| Product: | [Retired] Red Hat Linux | Reporter: | alvin |
| Component: | gcc | Assignee: | Jakub Jelinek <jakub> |
| Status: | CLOSED WONTFIX | QA Contact: | Brian Brock <bbrock> |
| Severity: | high | Docs Contact: | |
| Priority: | medium | ||
| Version: | 7.1 | ||
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | alpha | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2004-10-04 23:22:13 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: | |||
GCC 2.96-RH is now too old and there is not a self-contained testcase for this. If you manage to reproduce this with some recent GCC, please reopen. |
From Bugzilla Helper: User-Agent: Mozilla/4.76 [en] (X11; U; Linux 2.2.19-6.2.7.iplink2 i686) Description of problem: raid1.o will crash with a bad pointer but when a change is made that changes the optimization and flow of the code the bug goes away. Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: This uses gcc gcc version 2.96 20000731 (Red Hat Linux 7.1 2.96-101) 1. compile 2.4.x(X>9) kernel with raid1 2. test for crash 3. change code 4. compile 5. test Additional info: from raid1.c /* Find the disk which is closest */ do { if (disk <= 0) disk = conf->raid_disks; disk--; if ((conf->mirrors[disk].write_only) || (!conf->mirrors[disk].operational)) by changinging the code to: /* Find the disk which is closest */ do { if (disk <= 0) disk = conf->raid_disks; disk--; md_bugcheck(disk); if ((conf->mirrors[disk].write_only) || (!conf->mirrors[disk].operational)) continue; the problem seems to go away. the md_bugcheck is a routeine declaired in md.c that just returns. raid1 will not load with a kernel built with this compiler and code.