Re: [Bugme-new] [Bug 13302] New: "bad pmd" on fork() of process with hugepage shared memory segments attached

[Andrew Morton <akpm@linux-foundation.org>]

(switched to email.  Please respond via emailed reply-to-all, not via the
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(Please read this ^^^^ !)

On Wed, 13 May 2009 19:54:10 GMT
bugzilla-daemon@bugzilla.kernel.org wrote:

> http://bugzilla.kernel.org/show_bug.cgi?id=13302
> 
>            Summary: "bad pmd" on fork() of process with hugepage shared
>                     memory segments attached
>            Product: Memory Management
>            Version: 2.5
>     Kernel Version: 2.6.29.1
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: Other
>         AssignedTo: akpm@linux-foundation.org
>         ReportedBy: starlight@binnacle.cx
>         Regression: Yes
> 
> 
> Kernel reports "bad pmd" errors when process with hugepage
> shared memory segments attached executes fork() system call.
> Using vfork() avoids the issue.
> 
> Bug also appears in RHEL5 2.6.18-128.1.6.el5 and causes
> leakage of huge pages.
> 
> Bug does not appear in RHEL4 2.6.9-78.0.13.ELsmp.
> 
> See bug 12134 for an example of the errors reported
> by 'dmesg'.
> 


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