From: Andrea Righi <arighi@nvidia.com>
To: John Stultz <jstultz@google.com>
Cc: Tejun Heo <tj@kernel.org>, David Vernet <void@manifault.com>,
Changwoo Min <changwoo@igalia.com>,
Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
Valentin Schneider <vschneid@redhat.com>,
K Prateek Nayak <kprateek.nayak@amd.com>,
Christian Loehle <christian.loehle@arm.com>,
David Dai <david.dai@linux.dev>, Koba Ko <kobak@nvidia.com>,
Aiqun Yu <aiqun.yu@oss.qualcomm.com>,
Shuah Khan <shuah@kernel.org>,
sched-ext@lists.linux.dev, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 10/11] sched_ext: scx_qmap: Add proxy execution support
Date: Sat, 18 Jul 2026 10:24:21 +0200 [thread overview]
Message-ID: <als4NSM0zWyhAgEf@gpd4> (raw)
In-Reply-To: <CANDhNCqSSf9UPzo_6Z+giTJHRWC6X=D=daWuzbLWyDYsFbZ2qA@mail.gmail.com>
On Fri, Jul 17, 2026 at 11:04:16PM -0700, John Stultz wrote:
> On Fri, Jul 17, 2026 at 10:47 PM Andrea Righi <arighi@nvidia.com> wrote:
> > This looks like something related to BPF arena pointers and incorrectly
> > generated BPF code (the other schedulers don't use BPF arenas, so that'd explain
> > why you only see this with scx_qmap).
> >
> > Which version of clang are you using?
>
> Debian clang version 19.1.7 (3+b1)
>
> Running in a debian 13 vm. Though I'm using gcc normally for my
> builds (but I see the tools/sched_ext/ build does use clang explicitly
> for some things).
Yeah, we explicitly use clang to build BPF code. I'm on CachyOS, which ships
clang 22.1.8. In theory clang-19 should be enough... if you can mess up the VM
maybe give it a try with clang 20? From the dump it really looks like the
compiler failed to generate proper BPF code for arenas.
Thanks,
-Andrea
next prev parent reply other threads:[~2026-07-18 8:24 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-16 13:20 [PATCHSET v7 sched_ext/for-7.3] sched: Make proxy execution compatible with sched_ext Andrea Righi
2026-07-16 13:20 ` [PATCH 01/11] sched: Make NOHZ CFS bandwidth checks follow proxy donor Andrea Righi
2026-07-18 3:11 ` John Stultz
2026-07-16 13:20 ` [PATCH 02/11] sched: Add helper to block retained proxy donors Andrea Righi
2026-07-16 13:20 ` [PATCH 03/11] sched_ext: Block proxy donors across scheduler transitions Andrea Righi
2026-07-18 3:16 ` John Stultz
2026-07-16 13:20 ` [PATCH 04/11] sched_ext: Fix ops.running/stopping() pairing for proxy-exec donors Andrea Righi
2026-07-16 13:20 ` [PATCH 05/11] sched_ext: Fix TOCTOU race in consume_remote_task() Andrea Righi
2026-07-16 14:39 ` sashiko-bot
2026-07-16 21:29 ` Tejun Heo
2026-07-16 21:38 ` Tejun Heo
2026-07-17 6:35 ` Andrea Righi
2026-07-16 13:20 ` [PATCH 06/11] sched_ext: Split curr|donor references properly Andrea Righi
2026-07-16 15:02 ` sashiko-bot
2026-07-16 13:20 ` [PATCH 07/11] sched_ext: Handle blocked donor migration with proxy execution Andrea Righi
2026-07-16 15:22 ` sashiko-bot
2026-07-16 13:20 ` [PATCH 08/11] sched_ext: Delegate proxy donor admission to BPF schedulers Andrea Righi
2026-07-18 6:16 ` John Stultz
2026-07-18 6:50 ` John Stultz
2026-07-18 14:23 ` Andrea Righi
2026-07-16 13:20 ` [PATCH 09/11] sched_ext: Add selftest for blocked donor admission Andrea Righi
2026-07-16 13:20 ` [PATCH 10/11] sched_ext: scx_qmap: Add proxy execution support Andrea Righi
2026-07-16 15:54 ` sashiko-bot
2026-07-18 2:28 ` John Stultz
2026-07-18 5:47 ` Andrea Righi
2026-07-18 6:04 ` John Stultz
2026-07-18 8:24 ` Andrea Righi [this message]
2026-07-16 13:20 ` [PATCH 11/11] sched: Allow enabling proxy exec with sched_ext Andrea Righi
-- strict thread matches above, loose matches on Subject: below --
2026-07-15 20:54 [PATCHSET v6 sched_ext/for-7.3] sched: Make proxy execution compatible " Andrea Righi
2026-07-15 20:54 ` [PATCH 10/11] sched_ext: scx_qmap: Add proxy execution support Andrea Righi
2026-07-15 21:35 ` sashiko-bot
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