linux-kernel - Re: [regression] BUG: KASAN: use-after-free in lockdep_register

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Message-ID: <87y17qudwb.fsf@kernel.org>
Date: Fri, 31 May 2024 19:47:32 +0300
From: Kalle Valo <kvalo@...nel.org>
To: Dan Williams <dan.j.williams@...el.com>
Cc: Dave Jiang <dave.jiang@...el.com>,  Bjorn Helgaas <bhelgaas@...gle.com>,
  <linux-wireless@...r.kernel.org>,  <ath11k@...ts.infradead.org>,
  <regressions@...ts.linux.dev>,  Jeff Johnson <quic_jjohnson@...cinc.com>,
  <linux-kernel@...r.kernel.org>,  <linux-cxl@...r.kernel.org>,
  <linux-pci@...r.kernel.org>
Subject: Re: [regression] BUG: KASAN: use-after-free in
 lockdep_register_key+0x755/0x8f0

Dan Williams <dan.j.williams@...el.com> writes:

> Kalle Valo wrote:
> [..]
>> >> The proposed fix for that is here:
>> >>
>> >> http://lore.kernel.org/r/66560aa9dbedb_195e294b0@dwillia2-mobl3.amr.corp.intel.com.notmuch
>> >
>> > I get "Not Found" from that link, is there a typo?
>> 
>> I found this fix from for-linus branch:
>> 
>> # PCI: Fix missing lockdep annotation for pci_cfg_access_trylock()for-linus
>> https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git/commit/?h=for-linus&id=f941b9182c54a885a9d5d4cfd97af66873c98560
>> 
>> But at least that doesn't fix my crash.
>
> Sorry for the broken link I mistakenly used a message-id from an
> internal thread with the intel.com reporter. However, it is moot now
> because the new direction is to revert the lockdep infrastructure:
>
> https://lore.kernel.org/r/171711745834.1628941.5259278474013108507.stgit@dwillia2-xfh.jf.intel.com
>
> (that link works...)

Thanks, that links works :) I did a quick test with the three patches
and I didn't see any crashes anymore. But to be confident I need to run
overnight tests, I'll provide my Tested-by after that.

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