Bug 247158

Created attachment 158607 [details]
crash w/ usb

Created attachment 158608 [details]
crash w/o usb

This sounds similar to bug 190636, although the stack trace is
different.

I tried to reproduce this one a few times, but unfortunately I only have
a 10 Mbps hub to drive data through, so I don't seem to be able to
push the network fast enough to see this.

I just tested it locally. I got a complete lockup, with a fatal error displayed
on the console, no network response, and a quick reboot.

However, I couldn't get a crash using / (ext3, raid1) as the target volume. It
only happened when I tried another LVM, xfs volume.

This was a good excuse for me to get rid of my 10 Mbps hub and
order a shiny new gigE switch, so in a few days I'll be able to
test this again.

> I just tested it locally.

By that, I meant that I was rsyncing from localhost to localhost, and it crashed.

change QA contact

(In reply to comment #4)
> 
> However, I couldn't get a crash using / (ext3, raid1) as the target volume.
> It only happened when I tried another LVM, xfs volume.


I've noticed XFS is abusing the stack. Two functions are using more than 400 
bytes in the stack, each, and many others are using more than 100 bytes. 
Unless there are XFS fixes for stack usage to be picked from the non-xen 
kernel, the only fix would be increasing the stack size until XFS stack usage 
improves.

Yes, these are stack overflows from xfs, plain and simple:  

do_IRQ: stack overflow: 460

F8 should be a bit better in that regard, if you'd like to test, but I'm still
of the belief that if you stack up enough IO layers, 4k will be trouble for any
filesystem.  It's just that xfs does indeed have trouble a bit sooner. :)

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