linux-kernel - Re: [next-20170609] WARNING: CPU: 3 PID: 71167 at lib/idr.c:157 idr

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Message-ID: <149808789548.17054.471609626305557642@mail.alporthouse.com>
Date:   Thu, 22 Jun 2017 00:31:35 +0100
From:   Chris Wilson <chris@...is-wilson.co.uk>
To:     Tejun Heo <tj@...nel.org>, "David Airlie" <airlied@...ux.ie>
Cc:     "linuxppc-dev" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel" <linux-kernel@...r.kernel.org>,
        linux-next@...r.kernel.org, "sachinp" <sachinp@...ux.vnet.ibm.com>,
        "Stephen Rothwell" <sfr@...b.auug.org.au>,
        "Abdul Haleem" <abdhalee@...ux.vnet.ibm.com>
Subject: Re: [next-20170609] WARNING: CPU: 3 PID: 71167 at lib/idr.c:157 idr_replace

Quoting Tejun Heo (2017-06-13 14:58:49)
> Cc'ing David Airlie.
> 
> This is from drm driver calling in idr_replace() w/ a negative id.
> Probably a silly bug in error handling path?

No, this is the validation of an invalid userspace handle. The drm ABI
for handles is supposed to be a full u32 range with 0 reserved for an
invalid handle (constrained by the idr_alloc ofc). The WARN was
introduced by 0a835c4f090a.
-Chris