From: Yonghong Song <yonghong.song@linux.dev>
To: Alexei Starovoitov <alexei.starovoitov@gmail.com>,
Zac Ecob <zacecob@protonmail.com>
Cc: "bpf@vger.kernel.org" <bpf@vger.kernel.org>
Subject: Re: rcu_preempt detected stalls related to ebpf
Date: Sat, 15 Jun 2024 10:49:31 -0700 [thread overview]
Message-ID: <f3dde80e-c3b9-4cca-9617-7133e1ca7e98@linux.dev> (raw)
In-Reply-To: <CAADnVQJU30G1DezPLTzGyOSzG5TU3Tr-ZAoL+MYFEE+WKLD=2Q@mail.gmail.com>
On 6/15/24 9:59 AM, Alexei Starovoitov wrote:
> On Sat, Jun 15, 2024 at 12:09 AM Zac Ecob <zacecob@protonmail.com> wrote:
>>> I reduced the reproducer to the following:
>> Thank you for minimising the repro - I didn't think to do it myself. Apologies.
>>
>>> The verifier doesn't process the (s8) instruction correctly.
>> I took a further look out of curiosity and managed to properly crash the kernel. I think it might have security implications?
>> I haven't attached a repro for this because of such (though I could perhaps email it directly?).
>>
>> Not sure how best to precede?
> Pls focus your efforts on fixing the bug.
This is the fix: https://lore.kernel.org/bpf/20240615174621.3994321-1-yonghong.song@linux.dev/
Zac, could you test it in your environment?
prev parent reply other threads:[~2024-06-15 17:49 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-14 5:54 rcu_preempt detected stalls related to ebpf Zac Ecob
2024-06-14 21:19 ` Alexei Starovoitov
2024-06-15 7:09 ` Zac Ecob
2024-06-15 16:59 ` Alexei Starovoitov
2024-06-15 17:49 ` Yonghong Song [this message]
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