linux-kernel - Re: [PATCH] radix-tree: avoid NULL dereference

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Message-ID: <82416.1530888686@turing-police.cc.vt.edu>
Date:   Fri, 06 Jul 2018 10:51:26 -0400
From:   valdis.kletnieks@...edu
To:     Mark Rutland <mark.rutland@....com>
Cc:     linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <mawilcox@...rosoft.com>
Subject: Re: [PATCH] radix-tree: avoid NULL dereference

On Fri, 06 Jul 2018 14:41:44 +0100, Mark Rutland said:

> I beleive this is what Valdis hit [1] back in March. I spotted this while
> booting an arm64 machine.

Yes, the stack trace is the same.  The odd part is that I was consistently
seeing it until next-20180626, but it evaporated in sometime between that and
next-20180703. I suspect it has to do with the fact that -0626 was compiled
with gcc 8.1.1-3.fc29, but -0703 with 8.1.1.-4.fc29. As such, I probably won't
be able to test the patch without downgrading gcc....

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