On Wed, 26 Jul 2006, Ingo Molnar wrote:
* Ingo Molnar <[email protected]> wrote:
and i also had to do the fixes below to get it to build.
then it crashed with the assert below. I'll skip this one for now. I've
attached the patches (cleaned up for whitespaces) plus the
build-fixpatch.
Ingo
Brought up 2 CPUs
BUG at kernel/rtmutex.c:773!
------------[ cut here ]------------
kernel BUG at kernel/rtmutex.c:773!
invalid opcode: 0000 [#1]
PREEMPT SMP
Modules linked in:
CPU: 0
EIP: 0060:[<c03e407c>] Not tainted VLI
EFLAGS: 00010246 (2.6.17-rt7 #14)
EIP is at rt_lock_slowlock+0x21e/0x231
eax: 00000020 ebx: c31d7000 ecx: c0477be4 edx: c31d97f0
esi: 00000000 edi: c31d7d34 ebp: c31d7cdc esp: c31d7c70
ds: 007b es: 007b ss: 0068 preempt: 00000001
It is a very simple bug: The waiter was made garbage by the
debug_rt_mutex_free_waiter() before it was used in the BUG_ON() line.
My UP machine boots now with CONFIG_DEBUG_RT_MUTEXEX on in -rt8. Fix
is below. Apply on top of the patches you just send me with no further
changes. I hope I don't have white space damage in this small patch!!
Esben
kernel/rtmutex.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Index: linux-2.6.17-rt8/kernel/rtmutex.c
===================================================================
--- linux-2.6.17-rt8.orig/kernel/rtmutex.c
+++ linux-2.6.17-rt8/kernel/rtmutex.c
@@ -768,9 +768,9 @@ rt_lock_slowlock(struct rt_mutex *lock _
if (adjust_prio_final)
rt_mutex_adjust_prio_final(current, waiter.old_sched_lifo);
- debug_rt_mutex_free_waiter(&waiter);
BUG_ON(current->boosting_prio != MAX_PRIO);
BUG_ON(waiter.old_sched_lifo != get_sched_lifo());
+ debug_rt_mutex_free_waiter(&waiter);
}
/*
-
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