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SubjectRe: oops in tracepoint_update_probe_range() (was: Re: [oops -tip] : x86 AMD 64)
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On Wed, 2009-03-18 at 17:35 +0100, Ingo Molnar wrote:
> * Jaswinder Singh Rajput <jaswinder@kernel.org> wrote:
>
> > Good: f4c3c4cdb1de232
> > Bad : 1e08816af0bc345
> >
> > Config:
> > http://userweb.kernel.org/~jaswinder/oops_20090318/config-hpdv5-tip-bad-20090318
> >
> > oops:
> > http://userweb.kernel.org/~jaswinder/oops_20090318/oops_page1.jpg
> > http://userweb.kernel.org/~jaswinder/oops_20090318/oops_page2.jpg
> > http://userweb.kernel.org/~jaswinder/oops_20090318/oops_page3.jpg
> > http://userweb.kernel.org/~jaswinder/oops_20090318/oops_page4.jpg
> >
> > <freeze>
>
> Steve, Frederic - the crashes above are in:
>
> tracepoint_update_probe_range()
>
> in a modular kernel apparently.
>

This fixed the oops for me, Is this looks OK to you:

Subject: [PATCH] x86: tracepoint.c fix oops

BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<ffffffff8107d4de>] tracepoint_update_probe_range+0x1f/0x9b
PGD 13d5fb067 PUD 13d688067 PMD 0
Oops: 0000 [#1] SMP
Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
---
kernel/tracepoint.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
index 7960274..80d1353 100644
--- a/kernel/tracepoint.c
+++ b/kernel/tracepoint.c
@@ -280,6 +280,8 @@ void tracepoint_update_probe_range(struct tracepoint *begin,

mutex_lock(&tracepoints_mutex);
for (iter = begin; iter < end; iter++) {
+ if (!iter)
+ goto out;
mark_entry = get_tracepoint(iter->name);
if (mark_entry) {
set_tracepoint(&mark_entry, iter,
@@ -288,6 +290,7 @@ void tracepoint_update_probe_range(struct tracepoint *begin,
disable_tracepoint(iter);
}
}
+out:
mutex_unlock(&tracepoints_mutex);
}

--
1.6.0.6




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