Bug 65685
| Summary: | dd can fail to open autoloaded block device driver | ||
|---|---|---|---|
| Product: | [Retired] Red Hat Linux | Reporter: | mikpe |
| Component: | kernel | Assignee: | Arjan van de Ven <arjanv> |
| Status: | CLOSED CURRENTRELEASE | QA Contact: | Aaron Brown <abrown> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 7.3 | ||
| 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: | 2004-09-30 15:39:38 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: | |||
Looks like either a config problem (are the right aliases in /etc/modules.conf?) or a kmod bug Thanks for the bug report. However, Red Hat no longer maintains this version of the product. Please upgrade to the latest version and open a new bug if the problem persists. The Fedora Legacy project (http://fedoralegacy.org/) maintains some older releases, and if you believe this bug is interesting to them, please report the problem in the bug tracker at: http://bugzilla.fedora.us/ |
From Bugzilla Helper: User-Agent: Mozilla/4.79 [en] (X11; U; Linux 2.4.19-pre8 i686; Nav) Description of problem: Running "dd if=<dev>" as user, when <dev>'s driver modules aren't loaded, is supposed to autoload those modules. RedHat 7.3 fails to do so. Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: 0. Assume the CDROM is /dev/hdc. 1. As root, /sbin/rmmod the ide-cd and cdrom modules. 2. As user, dd if=/dev/hdc bs=4k count=1 of=/dev/null Actual Results: dd's open() of /dec/hdc in step 2 failed, and modprobe failed to insmod the ide-cd and cdrom modules. Expected Results: The ide-cd and cdrom modules should have autoloaded, and step 2's dd command should have succeeded. Additional info: There are several other access methods that _do_ correctly trigger the autoload: 3a. perform step 2 as root 3b. (as user) tar tvf /dev/hdc -- tar won't find an archive, but the modules load correctly 3c. dd bs=4k count=1 of=/dev/null < /dev/hdc regular open() and fopen() do work, just not in dd :-( This problem is new in RedHat 7.3. It causes problems for those of us that use custom kernels with modular floppy driver, and build test kernels with "make bzdisk" as regular users. Vanilla PC hardware. Vanilla RH7.3 install. RH7.2 worked.