lkml.org 
[lkml]   [2010]   [Apr]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: Random scheduler/unaligned accesses crashes with perf lock events on sparc 64
From
From: Frederic Weisbecker <fweisbec@gmail.com>
Date: Mon, 5 Apr 2010 08:57:04 +0200

> It seems to happen after an unaligned access fixup.

You shouldn't be getting the unaligned fixup in the first place,
especially in the locations where you see them. I suspect that
once you see first fixup, all of the registers in the cpu have
been corrupted in one way or another.

I suspect something fundamental gets corrupted, for example the
current register window (%cwp) is corrupted and that screws up all of
the registers so every single function starts accessing garbage.

My suspicions lie in three places, the ftrace mcount()
stubs, stack_trace_flush(), or the new perf_arch_save_caller_regs()
since those are the three places offhand that could make
us potentially make us return to function in the wrong
register window.


\
 
 \ /
  Last update: 2010-04-05 21:25    [W:0.101 / U:0.084 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site