linux-kernel - Re: [bpf] 568f196756: BUG:assuming_atomic_context_at

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Message-ID: <cdd8143b-7719-b51e-5a6a-6bdc065cc773@iogearbox.net>
Date:   Thu, 21 Feb 2019 14:39:27 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     kernel test robot <lkp@...el.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Jann Horn <jannh@...gle.com>, Alexei Starovoitov <ast@...nel.org>,
        Song Liu <songliubraving@...com>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>, lkp@...org
Subject: Re: [bpf] 568f196756: BUG:assuming_atomic_context_at_kernel/seccomp.c

On 02/21/2019 02:35 PM, kernel test robot wrote:
> 
> FYI, we noticed the following commit (built with gcc-7):
> 
> commit: 568f196756ad9fe2b49c46bbf6a9de1b190438b4 ("bpf: check that BPF programs run with preemption disabled")
> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
> 
> in testcase: boot
> 
> on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 2G
> 
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):

Fyi, false positive and already fixed in bpf-next.

(https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/commit/?id=435b3ff5b08a99a15647be32735abf8db66cea9a)