Bug 36017

Summary:	large diskactivity -> kernel freezes
Product:	[Retired] Red Hat Raw Hide	Reporter:	Dries Verachtert <dries>
Component:	kernel	Assignee:	Phil Copeland <copeland>
Status:	CLOSED RAWHIDE	QA Contact:	Brock Organ <borgan>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	1.0
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:	2001-05-29 20:25:04 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:

Description Dries Verachtert 2001-04-16 10:30:22 UTC

Used system: Personal Workstation 500a MiataGL
  scsi card: QLogic ISP1020 SCSI on PCI bus 01 device 20 irq 27 I/O base
0x9000
  2 harddisks of type RZ2CC-KB (C) DEC Rev: DC2B

When I'm copying a lot of files, the system sometimes hangs. I don't get an
oops or anything. Only thing i still can do is a hard reset.

It only crashes with linux 2.4.x (i'm now using kernel-2.4.2-0.1.49 from
rawhide, whole system is rawhide) The 2.2.x kernels don't have the problem.

Easy reproducable:
dd if=/dev/sda of=/dev/null &
dd if=/dev/sdb of=/dev/null &
and wait 5 minutes

Comment 1 Dries Verachtert 2001-05-24 21:25:13 UTC

the latest patch of Andrea Arcangeli which can be found at 
ftp://ftp.kernel.org/pub/linux/kernel/people/andrea/patches/v2.4/2.4.5pre5aa3/o_direct-7
seems to fix this problem. 

Wesley Daemen is the one who told me this good news. He already applied the 
patch and has started those dd commands to create a lot of harddisk activity 
and his miata doesn't crash.

Comment 2 Dries Verachtert 2001-05-25 13:38:07 UTC

2.4.4-ac17 also seems to have the fix. The fix is contained in the patch of 
Andrea but the original author seems to be  Ivan Kokshaysky.

Comment 3 Dries Verachtert 2001-05-27 15:29:05 UTC

2.4.5 also fixes the problem.

Comment 4 Phil Copeland 2001-05-29 21:15:32 UTC

I believe this is the tbia patch in pci_iommu.c

it's a bit dirty in that as far as I remember the bits to differnetiate between
tbia of 1 and 8 depending on what chipset  you're running (tsunami/clipper are 8
and I think all the rest are 1. I could very well be wrong)

I'm hacking in changes to the 2.4.3 kernel that will be released for 7.1 alpha

Phil
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Comment 5 Dries Verachtert 2001-05-29 22:03:48 UTC

Let me know where i can find the rpms if you want me to test a patched version :-)

Comment 6 Phil Copeland 2001-05-29 22:40:00 UTC

Hopefully rawhide should have kernel-2.4.3-7
That *should* work but probably not for tsunami/clipper motherboards

Phil
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