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SubjectRe: [4.7+] various memory corruption reports.
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On 07/29/2016 06:49 PM, Dave Jones wrote:
> On Fri, Jul 29, 2016 at 06:21:12PM +0300, Andrey Ryabinin wrote:
> > 2016-07-29 18:19 GMT+03:00 Dave Jones <davej@codemonkey.org.uk>:
> > > On Fri, Jul 29, 2016 at 11:05:14AM -0400, Dave Jones wrote:
> > > > I've just gotten back into running trinity on daily pulls of master, and it seems pretty horrific
> > > > right now. I can reproduce some kind of memory corruption within a couple minutes runtime.
> > > >
> > > > ,,,
> > > >
> > > > I'll work on narrowing down the exact syscalls needed to trigger this.
> > >
> > > Even limiting it to do just a simple syscall like execve (which fails most the time in trinity)
> > > triggers it, suggesting it's not syscall related, but the fact that trinity is forking/killing
> > > tons of processes at high rate is stressing something more fundamental.
> > >
> > > Given how easy this reproduces, I'll see if bisecting gives up something useful.
> >
> > I suspect this is false positives due to changes in KASAN.
> > Bisection probably will point to
> > 80a9201a5965f4715d5c09790862e0df84ce0614 ("mm, kasan: switch SLUB to
> > stackdepot, enable memory quarantine for SLUB)"
>
> good call. reverting that changeset seems to have solved it.
>

Unfortunately, I wasn't able to reproduce it.

Could you please try with this?

---
mm/kasan/kasan.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c
index b6f99e8..bf25340 100644
--- a/mm/kasan/kasan.c
+++ b/mm/kasan/kasan.c
@@ -543,8 +543,8 @@ bool kasan_slab_free(struct kmem_cache *cache, void *object)
switch (alloc_info->state) {
case KASAN_STATE_ALLOC:
alloc_info->state = KASAN_STATE_QUARANTINE;
- quarantine_put(free_info, cache);
set_track(&free_info->track, GFP_NOWAIT);
+ quarantine_put(free_info, cache);
kasan_poison_slab_free(cache, object);
return true;
case KASAN_STATE_QUARANTINE:
--
2.7.3
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