Bug 116766

Summary: IDE CD DMA + 4GB ia32e box == instant panic
Product: [Fedora] Fedora Reporter: Bill Nottingham <notting>
Component: kernelAssignee: Dave Jones <davej>
Status: CLOSED RAWHIDE QA Contact: Brian Brock <bbrock>
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: barryn, pfrields, rvokal
Target Milestone: ---   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Clone Of: Environment:
Last Closed: 2004-11-03 03:58:13 UTC Type: ---
Regression: --- Mount Type: ---
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Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Blocks: 123268    
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Description Flags
Patch fixing the issue none

Description Bill Nottingham 2004-02-25 00:02:20 UTC 
This is with kernel-2.6.3-1.104.

Booting the kernel and then accessing the CD (mount, checkisomd5) with
DMA gives an immediate panic, with a backtrace of:
 mark_clean + 172, pci_unmap_sg + 68, ide_destroy_dmatable + 42,
__ide_dma_end + 101, ide_cd:cdrom_read_intr:74

Booting with mem=4096M works OK.
DMA HD access works OK.

hdparm -d0 /dev/hdc causes it to then work OK.
Comment 1 Bill Nottingham 2004-03-04 15:54:49 UTC 
Works in 2.4, FWIW.
Comment 2 Dave Jones 2004-06-14 23:50:28 UTC 
did this get fixed ?
Comment 3 Bill Nottingham 2004-06-28 20:56:08 UTC 
Appears to have been.
Comment 4 Bill Nottingham 2004-07-09 22:37:02 UTC 
It's baaaaaaaaaaack....

2.6.7-1.478

Mounting a CD fails, says it can't read the filesystem.
chkisomd5sum on the CD device panics.
Comment 5 Suresh Siddha 2004-07-17 01:57:53 UTC 
Created attachment 101992 [details]
Patch fixing the issue

With swiotlb, pci_unmap_sg() was doing pci_unmap_single() instead of 
swiotlb_unmap_sg(). This will fail because, swiotlb_map_sg() is
setting up virtual address in sg->dma_address and pci_unmap_single()
expects physical address.

Attached patch will fix the issue.
Comment 6 Suresh Siddha 2004-11-02 22:05:40 UTC 
This issue is fixed in the base sometime back. Sorry forgot to update 
this bugzilla.
Comment 7 Bill Nottingham 2004-11-03 03:58:13 UTC 
Yeah, haven't seen this recently.