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SubjectRe: realtime-preempt patch-2.6.18-rt7 oops

* Mike Galbraith <> wrote:

> I just reproduced it running glibc make check. I had just enabled
> kprobes and recompiled with the stock SuSE-10.1 compiler while waiting
> for you to send me your .config (nevermind that request) so I could
> try to reproduce it here.

hm, so kprobe_flush_task() is likely PREEMPT_RT-unsafe.

could you try the patch below, does it help? (a quick review seems to
suggest that all codepaths protected by kretprobe_lock are atomic)


Index: linux/kernel/kprobes.c
--- linux.orig/kernel/kprobes.c
+++ linux/kernel/kprobes.c
@@ -50,7 +50,7 @@ static struct hlist_head kretprobe_inst_
static atomic_t kprobe_count;

DEFINE_MUTEX(kprobe_mutex); /* Protects kprobe_table */
-DEFINE_SPINLOCK(kretprobe_lock); /* Protects kretprobe_inst_table */
+DEFINE_RAW_SPINLOCK(kretprobe_lock); /* Protects kretprobe_inst_table */
static DEFINE_PER_CPU(struct kprobe *, kprobe_instance) = NULL;

static struct notifier_block kprobe_page_fault_nb = {
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