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Thu, 20 Mar 2025 21:28:23 -0700 (PDT) MIME-Version: 1.0 References: <3f156789-759e-4195-8881-c5c74ced85d4@app.fastmail.com> In-Reply-To: <3f156789-759e-4195-8881-c5c74ced85d4@app.fastmail.com> From: Nhat Pham Date: Thu, 20 Mar 2025 21:28:12 -0700 X-Gm-Features: AQ5f1JrJHijwea5Ekcs3NCuVlfFRza_Mz3GCffwOJyQfTUBXVH6rfobG-muC-bY Message-ID: Subject: Re: 6.14.0-rc6 lockdep warning kswapd To: Chris Murphy Cc: Linux List , Andrew Morton , Yosry Ahmed , Yosry Ahmed Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: E82ED80002 X-Stat-Signature: xri91iedtpakj3t8n9u4ws99yec613he X-Rspam-User: X-HE-Tag: 1742531303-230239 X-HE-Meta: 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 6t/aXXax tvPdk4ZybWcOUt/ITcOUOFFOkX5mKbnVg0m3HfdUNnJCZOVdVw8aJc5GLDY9OUH6CLMnHkbUQjppvWsSaMDCs214UtEZmXUlWi181DN8Nv4IxhIZdxIYEgme+wYiuM4DvVJZC6ACJ0uqBna1g9GdFAH5+1VCSnW6lMfkyKJ0u44079TXARXPQ6NCHTLYdmQKZ4yHwNXfdDVPGGj1jaln3lOnTaXJzJ8YkZCdBO9I9naWRvk2RwHl9lItfaDWcwv/gztl9TqlQCR2Xjnh9U6h+3IbWrUvUylp+cwMVi5BU8XFzh66l46Y53DRAlGLatddRKww/1ySF3wIbN4TLsu2LtaHqFEyXxVfbaInmQ/vpXiswdIpJOQVM8xi/m2jDJ8MJKLRf X-Bogosity: Ham, tests=bogofilter, spamicity=0.026394, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, Mar 19, 2025 at 9:31=E2=80=AFPM Chris Murphy wrote: > > > > On Wed, Mar 12, 2025, at 9:52 PM, Chris Murphy wrote: > > 6.14.0-0.rc6.49.fc42.x86_64+debug > > swap is enabled using a swapfile on btrfs (which is also used for /) > > zswap is enabled using zsmalloc/zstd > > > > Downstream bug report includes full dmesg.log attachment > > https://bugzilla.redhat.com/show_bug.cgi?id=3D2351794 > > Also occurs with 6.14.0-0.rc7.56.fc42.x86_64 > > It's not reproducible in any way I'm aware of, but isn't uncommon. Update= d bug report with rc7 dmesg. > > > -- > Chris Murphy > Eyeballing the trace, this looks awfully similar to the problem that Yosry was fixing here: https://lore.kernel.org/all/20250226185625.2672936-1-yosry.ahmed@linux.dev/ That should break the following link in the chain: &per_cpu_ptr(pool->acomp_ctx, cpu)->mutex --> scomp_lock since we release the first lock, before acquiring the second lock. I don't think this is in rc6 yet. Can you apply the patch and test again?