linux-kernel - Re: Preemptible idr

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Message-ID: <20210126145833.GM308988@casper.infradead.org>
Date:   Tue, 26 Jan 2021 14:58:33 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Mark Rutland <mark.rutland@....com>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Courtney Cavin <courtney.cavin@...ymobile.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: Re: Preemptible idr_alloc() in QRTR code

On Tue, Jan 26, 2021 at 10:47:34AM +0000, Mark Rutland wrote:
> Hi,
> 
> When fuzzing arm64 with Syzkaller, I'm seeing some splats where
> this_cpu_ptr() is used in the bowels of idr_alloc(), by way of
> radix_tree_node_alloc(), in a preemptible context:

I sent a patch to fix this last June.  The maintainer seems to be
under the impression that I care an awful lot more about their
code than I do.

https://lore.kernel.org/netdev/20200605120037.17427-1-willy@infradead.org/