Re: KASAN use-after-free not showing freed stacktrace?

From	Vegard Nossum <vegard.nossum@oracle.com>
Newsgroups	linux.kernel
Subject	Re: KASAN use-after-free not showing freed stacktrace?
Date	2016-07-30 00:00 +0200
Message-ID	<s0nYZ-1VC-1@gated-at.bofh.it> (permalink)
References	<s0mqd-11x-9@gated-at.bofh.it> <s0nvY-1Jz-17@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On 07/29/2016 11:27 PM, Dmitry Vyukov wrote:
> On Fri, Jul 29, 2016 at 10:17 PM, Vegard Nossum
> <vegard.nossum@oracle.com> wrote:
>> Hi again,
>>
>> I am seeing some KASAN use-after-free bugs now but there is no
>> stacktrace for where they were freed anymore:
[...]
>> That seems like a regression, maybe related to memory quarantine
>> for SLUB? Or is there something else going on?

 > Do you use SLAB or SLUB? Is CONFIG_STACKDEPOT enabled? Kernel revision?

CONFIG_SLUB_DEBUG=y
# CONFIG_SLAB is not set
CONFIG_SLUB=y
# CONFIG_SLOB is not set
CONFIG_SLAB_FREELIST_RANDOM=y
CONFIG_SLUB_CPU_PARTIAL=y
CONFIG_SLABINFO=y
# CONFIG_SLUB_DEBUG_ON is not set
# CONFIG_SLUB_STATS is not set
CONFIG_FAILSLAB=y

CONFIG_STACKDEPOT=y

git version c624c86615fb8aa61fa76ed8c935446d06c80e77


Vegard

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KASAN use-after-free not showing freed stacktrace? Vegard Nossum <vegard.nossum@oracle.com> - 2016-07-29 22:20 +0200
  Re: KASAN use-after-free not showing freed stacktrace? Dmitry Vyukov <dvyukov@google.com> - 2016-07-29 23:30 +0200
    Re: KASAN use-after-free not showing freed stacktrace? Vegard Nossum <vegard.nossum@oracle.com> - 2016-07-30 00:00 +0200

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