Re: [stable] 2.6.16.6 breaks java... sort of

[David Wilk]

right, sorry, I forgot to try strace.  let me see what I can do.

On 4/21/06, Chris Wright <chrisw@xxxxxxxxxxxx> wrote:
> * David Wilk (davidwilk@xxxxxxxxx) wrote:
> > Ok, on my first test system (lowest amount of ram) a 2.6.16.9 kernel
> > patched with the patch you provided works fine.  I'll throw it on some
> > other systems and we'll see how it does.
>
> Was that same (lowest amount of ram) system failing before Hugh's patch
> with vanilla 2.6.16.9?  What we're looking for is to see if the app
> was doing:
>
> 1) shmget(0444) [RDONLY], shmat(SHM_RDONLY), mprotect(PROT_WRITE)
> or
> 2) shmget(0666) [RDWR], shmat(SHM_RDONLY), mprotect(PROT_WRITE)
>
> The first is definitely a bug, and that's what the original patch
> was closing.  The second is technically (as in POSIX) undefined, and
> the original patch treated it as a bug as well.  Hugh's additional
> patch allows this behaviour, as it's vaguely similar to open(RDWR),
> mmap(PROT_READ), mprotect(PROT_WRITE), which is legitimate.  So we're
> trying to determine if that's what your app is doing.  strace output
> may be unwieldy, but that (or using syscall audit) would be helpful
> to clarify.
>
> thanks,
> -chris
>
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