Red Hat Bugzilla – Bug 247158
process and kernel crashes under xen kernel with xfs stack overflow
Last modified: 2009-12-14 15:41:13 EST
Description of problem:
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. boot into xen0 (with or without xend running)
2. start a large rsync going either to or from affected box
rsync crashes in kernel space, following hypervisor calls
sometimes system hangs, gets checked, reboots
please see the two attached `dmesg`s, one with USB and one without. Apparently
not the same problem as bug 190636...
The local FS is on a single-physical-volume LVM set with no RAID. This problem
does not occur under non-Xen kernels.
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
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
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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