On Sun, 30 Sep 2007, Ingo Molnar wrote:
> * Martin Schwidefsky <[email protected]> wrote:
>
> > Hi Ingo,
> > I finally found the bug that causes tst-robust8 from the glibc to fail
> > on s390x. Turned out to be a common code problem with the processing of
> > the robust futex list. The patch below fixes the bug for me.
>
> good catch! A quick preliminary review of your patch indicates it's fine
> - and it might be v2.6.23 material.
>
> Acked-by: Ingo Molnar <[email protected]>
Acked-by: Thomas Gleixner <[email protected]>
> > Calling handle_futex_death in exit_robust_list for the different
> > robust mutexes of a thread basically frees the mutex. Another thread
> > might grab the lock immediately which updates the next pointer of the
> > mutex. fetch_robust_entry over the next pointer might therefore branch
> > into the robust mutex list of a different thread. This can cause two
> > problems: 1) some mutexes held by the dead thread are not getting
> > freed and 2) some mutexs held by a different thread are freed. The
> > next point need to be read before calling handle_futex_death.
>
> nasty race... Ulrich, Thomas, do you concur?
Yes. Where do they sell those brown paperbags again ?
tglx
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
