linux-kernel - Re: [PATCH] bpf: don't call mmap_read

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Date: Sat, 15 Jun 2024 00:15:24 +0900
From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To: Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Eduard Zingerman
 <eddyz87@...il.com>, Song Liu <song@...nel.org>,
        Yonghong Song <yonghong.song@...ux.dev>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>
Cc: bpf <bpf@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] bpf: don't call mmap_read_trylock() from IRQ context

On 2024/06/08 20:04, Tetsuo Handa wrote:
> On 2024/06/08 19:53, Tetsuo Handa wrote:
>> inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage.
> 
> Oops, "inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage." example was
> found at https://syzkaller.appspot.com/text?tag=CrashReport&x=14f0179a980000 .
> 
> Then, do we want to
> 
> -	if (in_hardirq()) {
> +	if (!in_task()) {
> 
> instead?
> 

"inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage." upon unlock from IRQ work
was reported at https://syzkaller.appspot.com/bug?extid=40905bca570ae6784745 .