Kernel Bug Tracker – Bug 10711
BUG: unable to handle kernel paging request - scsi_bus_uevent
Last modified: 2008-06-16 14:49:31 UTC
Subject : BUG: unable to handle kernel paging request - scsi_bus_uevent
Submitter : "Zdenek Kabelac" <firstname.lastname@example.org>
Date : 2008-05-14 11:23
References : http://lkml.org/lkml/2008/5/14/111
This entry is being used for tracking a regression from 2.6.25. Please don't
close it until the problem is fixed in the mainline.
Bug happend at least twice on my desktop with 2.6.26-rc3 - thought now I do not have such a backtrace as this deadlock now kills the machine - I just know that RIP was from scsi_bus_uevent. If it would be worth to add - I could try to add a camera snapshost - but the trace is far from complete (just some bottom lines :( ).
The error happens once per couple reboots - but it is unpredicteble and hard to check. But it is definitely present in -rc3
Yes I still see it too despite the patches mentioned in http://groups.google.com/group/fa.linux.kernel/browse_frm/thread/b64dbe94dea882cb/a8f1d83328fcbdc3?#a8f1d83328fcbdc3 . I bisected it down in http://groups.google.com/group/fa.linux.kernel/msg/c36e78f19fc4aaa3 and reverting the commit [dc16f5f2ede8cc2acf8ac22857a7fecf3a4296c2] PNP: make generic pnp_add_dma_resource() semmed to make the problem go away.
This seems to have been resolved by James's patch in http://groups.google.com/group/fa.linux.kernel/browse_frm/thread/b64dbe94dea882cb/c60bafa089f89c6b?#c60bafa089f89c6b for me...
Is this the bugfix - or just the patch hides the real problem ?
I would have assumed that scsi_bus_uevent should not have been called at all for the non-scsi device
Many subsystems (like the new PATA/SATA layer and USB block devices) also utilise the SCSI layer.
This doesn't happen in the latest -next kernels for me.
Does it happen with 2.6.26-rc4-git4?
I'll had to make more test boots to see if the bug is still present - but I do not have a good testcase where I could easily replicate the bug - it happens randomly during the boot - I think no patch solving this issue was committed to the mainline so far ?
On Monday, 16 of June 2008, Zdenek Kabelac wrote:
> I've not see this bug over quite a few recent reboots - so I'd would
> have considered this bug also fixed for me - if the problem reapers
> I'll reopen this bug.
> (Well if there was no commit fixing this bug directly - it's hard to
> be sure the bug is fixed)
There WAS a commit fixing this bug directly - it was carried in the SCSI fixes tree and was commit [1f42ea7bc0ddfadebd9e1c5362b41b53902dbcb1] and started turned up first in the next-20080526 tree and was committed to v2.6.26-rc5 (if gitk is right).