Re: modify_ldt errors on x86_64

[Karl Rister <kmr@us.ibm.com>]

On Saturday 12 November 2005 7:06 am, Ian Pratt wrote:
> > I am trying to run some Java tests in a dom0 running on
> > x86_64 and I am receiving the following error message:
> >
> > setupLdt: modify_ldt: Invalid argument
> >
> > After 2 of these the JVM just hangs and I have to kill it.
> > This does not happen when booting the systerm without Xen.  I
> > have tried several different changesets from the past few
> > days and have seen the same thing on all of them.  My current
> > changeset is 7746.  Has anyone else seen this?
>
> No, this is the first report.
>
> Which version of Java are you using. Have you a simple test case?

"java -version" returns the following on baremetal Linux, this simple test is 
enough to cause the problem in domain0

java version "1.4.2"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2)
Classic VM (build 1.4.2, J2RE 1.4.2 IBM build cxia32142sr1a-20050209 (JIT 
enabled: jitc))

An strace on the java process shows these two messages being dumped over and 
over again in a loop:

rt_sigprocmask(SIG_UNBLOCK, [ILL TRAP BUS FPE SEGV], ~[KILL USR2 STOP RTMIN 
RT_1], 8) = 0
--- SIGSEGV (Segmentation fault) @ 0 (0) ---

>
> Can you repro in domain0?

As noted above, yes.

>
> Have you modified the default kernel config?

Yes.  The following options were appended to the kernel config file:

CONFIG_MD=y
CONFIG_BLK_DEV_MD=y
CONFIG_MD_LINEAR=y
CONFIG_MD_RAID0=y
CONFIG_MD_RAID1=y
CONFIG_MD_RAID5=y
CONFIG_BLK_DEV_DM=y
CONFIG_ACPI=y
CONFIG_AGP=n
CONFIG_SCSI_FC_ATTRS=y
CONFIG_SCSI_QLA2300=y
CONFIG_FUSION=y
CONFIG_FUSION_CTL=y
CONFIG_E1000=m
CONFIG_PROFILING=y
CONFIG_OPROFILE=m
CONFIG_TIGON3=m
CONFIG_CRYPTO=n
CONFIG_CRYPTO_CRC32C=n
CONFIG_CRC32=n
CONFIG_LIBCRC32C=n
CONFIG_SCSI_ADP94XX=y

>
> Thanks,
> Ian
>
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-- 
Karl Rister