linux-kernel - Re: [LKP] 4ce5f9c9e7 [ 1.323881] WARNING: CPU: 0 PID: 1 at mm/slab_common.c:1031 kmalloc

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Date:   Wed, 10 Oct 2018 17:06:52 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     kernel test robot <rong.a.chen@...el.com>
Cc:     linux-kernel@...r.kernel.org, LKP <lkp@...org>
Subject: Re: [LKP] 4ce5f9c9e7 [ 1.323881] WARNING: CPU: 0 PID: 1 at mm/slab_common.c:1031 kmalloc_slab

ebiederm@...ssion.com (Eric W. Biederman) writes:

> So I am flummoxed.  I am reading through the code and I don't see
> anything that could trigger this, and when I ran the supplied reproducer
> it did not reproduce for me.

Even more so.  With my tool chain the line that reports the failing
address is impossible.

[   73.034423] RIP: 0010:copy_siginfo_from_user+0x4d/0xd0

With the supplied configureation my tool chain only has 0x30 bytes for
all of copy_siginfo_from_user.  So I can't even begin to guess where
in that function things are failing.

Any additional information that you can provide would be a real help
in tracking down this strange failure.

Thank you,
Eric Biederman