linux-kernel - Re: Abnormal values show up in /proc/allocinfo

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Message-ID: <CAJuCfpHviS-pw=2=BNTxp1TnphjuiqWGgZnq84EHvbz08iQ6eg@mail.gmail.com>
Date: Sun, 24 Nov 2024 16:35:54 -0800
From: Suren Baghdasaryan <surenb@...gle.com>
To: David Wang <00107082@....com>
Cc: kent.overstreet@...ux.dev, linux-kernel@...r.kernel.org
Subject: Re: Abnormal values show up in /proc/allocinfo

On Sat, Nov 23, 2024 at 11:43 PM David Wang <00107082@....com> wrote:
>
> Hi,
>
> I am running 6.12.0 for a week, and today I notice several strange
> items in /proc/allocinfo:
>
>        -4096 18446744073709551615 mm/filemap.c:3787 func:do_read_cache_folio
>  -1946730496 18446744073709076340 mm/filemap.c:1952 func:__filemap_get_folio
>   -903294976 18446744073709331085 mm/readahead.c:263 func:page_cache_ra_unbounded
>   -353054720 18446744073709465421 mm/shmem.c:1769 func:shmem_alloc_folio
>  10547565210        0 mm/compaction.c:1880 func:compaction_alloc
>   -156487680 18446744073709513411 mm/memory.c:1064 func:folio_prealloc
>  -2422685696 18446744073708960140 mm/memory.c:1062 func:folio_prealloc
>  -2332479488 18446744073708982163 fs/btrfs/extent_io.c:635 [btrfs] func:btrfs_alloc_page_array
>
> some values are way too large, seems like corrupted/uninitialized, and values for compaction_alloc
> are inconsistent: non-zero size with zero count.
>
> I do not know when those data became this strange, and I have not reboot my system yet.
> Do you guys need extra information before I reboot my system and started to try reproducing?

Hi David,
Thanks for reporting. Can you share your .config file? Also, do you
see these abnormal values shortly after boot or does it take time for
them to get into abnormal state?
I'll take a look on Monday and see if there is an obvious issue and if
I can reproduce this.
Thanks,
Suren.

>
>
> Thanks
> David
>
>
>
>