linux-kernel - Re: Linux-next: crash in alloc_huge

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Message-ID: <YRM+qm66PfTUQNFL@casper.infradead.org>
Date:   Wed, 11 Aug 2021 04:06:18 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Qian Cai <quic_qiancai@...cinc.com>
Cc:     Mike Rapoport <rppt@...ux.ibm.com>,
        David Hildenbrand <david@...hat.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux-next: crash in alloc_huge_page()

On Tue, Aug 10, 2021 at 10:22:37PM -0400, Qian Cai wrote:
> and the page->lru has an address fffffffffffffffc for some reasons. Does it sound like some error code
> had not been handled properly and had been propagated here instead? I tried reverting a few recent
> commits for mm/hugetlb.c and mm/memblock.c without luck so far.

Yes, ff..fc is going to be at offset 8 from the actual address, so
that's -12 and -12 is ...

#define ENOMEM          12      /* Out of memory */

so something's returning ERR_PTR(-ENOMEM) instead of NULL.

> [ 8107.262232][T62705] Unable to handle kernel paging request at virtual address fffffffffffffffc

These logs would be a lot easier to read if you snipped the irrelevant
timestamp and whatever this Txxxxx thing is.