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Date:   Wed, 24 Mar 2021 09:28:17 +0100
From:   Christoph Hellwig <hch@lst.de>
To:     Frank Scheiner <frank.scheiner@web.de>
Cc:     Christoph Hellwig <hch@lst.de>, Jan Engelhardt <jengelh@inai.de>,
        John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>,
        Sparc kernel list <sparclinux@vger.kernel.org>,
        debian-sparc <debian-sparc@lists.debian.org>
Subject: Re: Regression in 028abd92 for Sun UltraSPARC T1
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References: <9ffdf604-ce04-9200-65c9-dd8921a45038@web.de> <186a7992-6e83-dc8a-1cfc-d07bb36935f5@physik.fu-berlin.de> <4d033ff9-329e-77e7-20de-720aa65bba3e@web.de> <n0n38p9-rn4s-213-n983-9o3o4oo8s54r@vanv.qr> <20210323165721.GA14577@lst.de> <d68767c2-e010-f90e-9f2c-bb5250465c58@web.de>
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On Tue, Mar 23, 2021 at 11:17:41PM +0100, Frank Scheiner wrote:
> 028abd9222df0cf5855dab5014a5ebaf06f90565
>
> ...is broken on my T1000.
>
> As I don't know how big attachments can be on this list, I put the logs
> on pastebin.
>
> A log for 028abd9222df is here:
>
> https://pastebin.com/ApPYsMcu

Just do confirm:  in this tree line 304 in mm/slub.c is this BUG_ON:

	BUG_ON(object == fp); /* naive detection of double free or corruption */

which would mean we have a double free.  In that case it would be
interesting which call to kfree this is, which could be done by
calling gdb on vmlinux and then typing;

l *(sys_mount+0x114/0x1e0)

Not that a double free caused by this conversion makes any sense to me..