Bug#569797: misaligned signal stack on sparc
On Sun, 2010-02-14 at 12:36 +0100, Bernhard R. Link wrote:
> Package: linux-image-2.6.32-2-sparc64-smp
> Version: 2.6.32-8
> Severity: serious
> On my sid sparc box I can reproducibly cause a shell getting
> in a state where the kernel soft-locks and one cpu is only
> occupied py this process. kill -KILL does not work, sync does
> not work, restarting the computer needs reboot -n -f and so on.
> I think this is due to some misalignment of signal stacks, as
> described in
> (at least the hanging cpu hangs in the area this patch touches and
> the process seems to be hanging in some fault handler occouring in
> a fault handler occouring in some signal stuff as far as I can tell,
> my sparc assembler skills are quite limited).
> Note that the patch given in the mail has still a typo described in
> See also
> (Though I do not know if this fix for the patch is needed for 32 bit
> sparc kernels Debian afaik no longer has or for 32 bit user space,
> but I guess adding both is safest in any case).
I've forwarded these changes to email@example.com for review. Thank you
for finding them.
> Bernhard R. Link
> This bug also effects (at least) 2.6.32-3 and 2.6.32-5, but I have no
> idea how to tell this the bts as the binary package name changed.
You should report bugs against the source package linux-2.6, and the bug
script ensures that this happens. Please use reportbug in future.
It is easier to change the specification to fit the program than vice versa.