http://bugzilla.kernel.org/show_bug.cgi?id=11646 Summary: QLA2xxx: Kernel deadlock on high load somewhere after 2.6.20 Product: IO/Storage Version: 2.5 KernelVersion: 2.6.26.5 Platform: All OS/Version: Linux Tree: Mainline Status: NEW Severity: high Priority: P1 Component: SCSI AssignedTo: linux-scsi@xxxxxxxxxxxxxxx ReportedBy: grin@xxxxxxx Latest working kernel version: 2.6.20 Earliest failing kernel version: known 2.6.24 Distribution: Debian stable Hardware Environment: QLogic Corp. QLA2422 Fibre Channel Adapter (rev 02), IBM (intel based) HS21 blade server, external SAN storage [IBM DS4200], optional full multipath (happens with or without), further details on specified requests Software Environment: multipathd handling dm devices, lvm2, xfs Problem Description: The machines go dead under heavy IO load. Go dead may mean rare complete crashes, more often infinite resource wait states, or stuck udev streads all over. The diagnostic was pretty hard, many components were checked and finally it boiled down to the qla2xxx driver. It seems that somewhere after 2.6.20 the driver have a problem with high loads, where it first: - start to see (or generate) link downs without reason - tries to handle these, by logging thousands of "try to dump firmware" messages, while - somehow screw up IRQ handling, because more often than not even eth0 starts complaining about transmit timeouts, and the kernel often say "..no IRQ handler for vector" - never recovers. I've seen many messages like: == mailbox command timeout == performing isp recovery == loop up 4gbps == SNS scan failed - assuming zero entry result == scsi: abort command issued ... then often == FC repot port time out == SCSI DEVICE RESET ISSUED and it sometimes ends with a stack trace and the happy message == RIP 0x10 The diagnosic is hard because I cannot easily make it crash by force: even bonnie++ survive multiple runs without problems, but a busy postgres can crash it in a few hours usually. After we changed and upgraded almost everything in both paths and nothing helped (including kernel upgrade to latest official one) I backed up to 2.6.20 and the problem disappeared. It is not easy to tell when was it broken because I cannot just start playing with live servers and I cannot make it crash on a test server. But if you have any tests which should crash it then I can try it on a different (testing) machine. Steps to reproduce: I wish I knew. Loads of IO in an unknown pattern make it die in a few hours, or days. I can provide any info you ask and I'm able to pry out of the machines, kernel [logs], etc. Most crashes does only have screenshots of remote console, since it killed all disk IO around. -- Configure bugmail: http://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug, or are watching the assignee. -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
