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Re: [Xen-devel] [PATCH v5 2/4] x86/ldt: Make modify_ldt synchronous

On 07/30/2015 03:25 PM, Andy Lutomirski wrote:
On Thu, Jul 30, 2015 at 11:35 AM, Boris Ostrovsky
<boris.ostrovsky@xxxxxxxxxx> wrote:
[OK]    LDT entry 0 has AR 0x0040F200 and limit 0x00000000
[OK]    LDT entry 0 is invalid
[RUN]   Cross-CPU LDT invalidation
Segmentation fault (core dumped)
That's not good.

Can you backtrace it?  (I.e. compite ldt_gdt_32 with -g and load the
core dumb in gdb?)  My best guesses are either a signal delivery
failure (although that shouldn't be a problem for 32-bit userspace on
any kernel) or an actual LDT access fault, and the latter would be

I haven't been able to reproduce this.

This looks like a userspace bug. Breaks on F18, works fine in F22.

Possibly something about signal handling --- I noticed on F18 I'd get two SEGV's in a row whereas we should only get one.

Anyway, this is not an issue as far as this thread is concerned.


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