http://bugzilla.kernel.org/show_bug.cgi?id=13345 Summary: panic when reading data from IDE CDROM with >= 2.6.29 kernels Product: IO/Storage Version: 2.5 Kernel Version: 2.6.30-rc5 Platform: All OS/Version: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: IDE AssignedTo: io_ide@xxxxxxxxxxxxxxxxxxxx ReportedBy: modestas@xxxxxxxxxx Regression: Yes Created an attachment (id=21439) --> (http://bugzilla.kernel.org/attachment.cgi?id=21439) Backtrace of the OOPS with 2.6.30-rc5 Hello, I get kernel panic when data is read from IDE CDROM with 2.6.29 or later kernels (testing 2.6.30-rc5 at the moment). I have never had the issue with 2.6.28 and earlier kernels. I suspect the cause though. My CD/DVD drive is pretty old and might be a bit faulty (or this might kernel be misinterpreting my drive sometimes). <= 2.6.28 kernels used to turn off DMA due to seek errors (if I recall correctly) sometimes. However, I used to be able to turn DMA back on with hdparm and I have never really had read() failures. Now with >= 2.6.29 I have never seen DMA being turn off on my CD/DVD drive but I guess kernel just panics instead. So I suspect there is a regression in the latest kernels which triggers unrecoverable panic instead of drive reset. I got the attached backtrace (sorry, I couldn't do better than this picture) with 2.6.30-rc5 on Debian unstable amd64 box while doing a simple: $ dd if=/dev/cdrom of=/dev/null bs=1M -- Configure bugmail: http://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are watching the assignee of the bug. -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
