linux-kernel - Re: BPF crash with 3.18-rc1 on arm64 Juno hardware

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Message-ID: <20141024103158.GB1955@localhost>
Date:	Fri, 24 Oct 2014 11:31:58 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Z Lim <zlim.lnx@...il.com>
Cc:	Andre Przywara <Andre.Przywara@....com>,
	Will Deacon <Will.Deacon@....com>,
	LAKML <linux-arm-kernel@...ts.infradead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: BPF crash with 3.18-rc1 on arm64 Juno hardware

On Thu, Oct 23, 2014 at 06:23:49PM +0100, Z Lim wrote:
> On Thu, Oct 23, 2014 at 10:00 AM, Andre Przywara <andre.przywara@....com> wrote:
> > I see a crash with 3.18-rc1 on a Juno board related to bpf_jit (see dump
> > below). Userland tries to carry on afterwards, but eventually hangs in
> > RCU stalls.
> > The kernel has just CONFIG_BPF_JIT enabled, I guess Ubuntu enables this
> > automatically if detected.
> 
> When net-next and arm64-next merged in mainline, a silent failure is
> introduced due to new enhancements in net/bpf.
> This was actually uncovered before 3.18 merge window, and Daniel's
> patch to fix this was discussed here [1].
> I see that Catalin has queued up this patch in fixes/core [2].

Indeed. Pull request to Linus will go out later today.

-- 
Catalin
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