Red Hat Bugzilla – Bug 171733
boot lockup on IBM xSeries 345 (ServerWorks)
Last modified: 2015-01-04 17:22:47 EST
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Description of problem:
This is an obscure case.
xSeries 345, pretty vanilla config (tg3, serverworks, MPT Fusion)
One CPU, kernel-smp installed
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. install a FC4 2.6.13 kernel
2. modify grub.conf to specify maxcpus=1
3. attempt to boot
Actual Results: system locks up hard during serverworks probe... sometimes probing serial ports, sometimes probing IDE
Expected Results: the system should come up
Yes, this is a case of "doctor, it hurts when I do this" but in several racks of similar but not identical machines it helps to be able to configure the single and dual cpu machines identically. We were setting maxcpus=1 while trying to track down the NFS client lockup reported in another bug.
The real question is: is this a symptom of a worse problem?
There is a work-around. When I disable hyperthreading in the BIOS the system comes up.
So here's the scenario:
HT enabled in BIOS
system boot hangs during device probes
*** This bug has been marked as a duplicate of 169610 ***
Nope, it's not an initrd problem. The only issues is with attempting to set
MAXCPUS=1 on an SMP kernel on this platform when there's only one CPU in the
box. Same initrd boots fine without MAXCPUS=1
2.6.14-1.1637_FC4 has been released as an update for FC4.
Please retest with this update, as a large amount of code has been changed in
this release, which may have fixed your problem.
This is a mass-update to all currently open kernel bugs.
A new kernel update has been released (Version: 2.6.15-1.1830_FC4)
based upon a new upstream kernel release.
Please retest against this new kernel, as a large number of patches
go into each upstream release, possibly including changes that
may address this problem.
This bug has been placed in NEEDINFO_REPORTER state.
Due to the large volume of inactive bugs in bugzilla, if this bug is
still in this state in two weeks time, it will be closed.
Should this bug still be relevant after this period, the reporter
can reopen the bug at any time. Any other users on the Cc: list
of this bug can request that the bug be reopened by adding a
comment to the bug.
If this bug is a problem preventing you from installing the
release this version is filed against, please see bug 169613.
Closing per previous comment.