> Just got power & cooling back to my computer lab (and I'm back to
> reporting bugs). I have a bqacklog of things to test but on E420R I got
> a halt during early bootup:
> [ 0.000000] Kernel: Using 5 locked TLB entries for main kernel image.
> [ 0.000000] Remapping the kernel... done.
>
> RED State Exception
Bisected:
commit 1a40b95374f680625318ab61d81958e949e0afe3
Author: Mike Frysinger <vapier@xxxxxxxxxx>
Date: Mon Jan 18 06:32:30 2016 -0500
sparc: Fix system call tracing register handling.
A system call trace trigger on entry allows the tracing
process to inspect and potentially change the traced
process's registers.
Account for that by reloading the %g1 (syscall number)
and %i0-%i5 (syscall argument) values. We need to be
careful to revalidate the range of %g1, and reload the
system call table entry it corresponds to into %l7.
Reported-by: Mike Frysinger <vapier@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Tested-by: Mike Frysinger <vapier@xxxxxxxxxx>
:040000 040000 3fa8c484537ffff82dd469dba7a0f2b770cf8505 5a9834a3f5ed8bae7f788bdeb9bee15279618b5c M arch
Actually this commit juts makes the system hang here, not RED state
exception. a couple of last bisect targets were like that so if needed,
I can also bisect where the hang transformed into RED State Exception.
--
Meelis Roos (mroos@xxxxxxxx)
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