From nobody Tue Oct 7 03:46:26 2025 Received: from mail-pg1-f179.google.com (mail-pg1-f179.google.com [209.85.215.179]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 152E25C96; Tue, 15 Jul 2025 06:24:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.179 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752560669; cv=none; b=ABzvJ3TuewGZyYnUNpc8AD2Jx8A7iUmzRmGUUPI4sW868UMcBK4sLjQVMRVeaXUwH03S+F4zS/YwS7CswQXMtH0drvIYn0ywB2SXa2UqZaBf/Q/Mfnud72V1OFFijY+YNZvweXSD/0bplOIZAOIlNdJeIa2c1OgEWe5Cvv4N648= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752560669; c=relaxed/simple; bh=g4vK8+ewCImz+rjK4arl+/dmIVCWj1Nv+zLRHy1djlM=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=OIxd5kPwvIvGDL77zd/7CQbbmug266qKNB9VdSGO7ltIPiGh50T6HytuKB80xKo6Mt1frdwb8WNLB3EEssqf/V6IC0ajyp+8UTRUgezRtzTrQEGmT5PHKaSGwbhuvbzvRCAZDGKUJOQosmTf4rfKU8287Oql1gFxPfmY2RpUmbI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=EpQ3RY1b; arc=none smtp.client-ip=209.85.215.179 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="EpQ3RY1b" Received: by mail-pg1-f179.google.com with SMTP id 41be03b00d2f7-b31c84b8052so5878047a12.1; Mon, 14 Jul 2025 23:24:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1752560667; x=1753165467; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=/3GeJz9Omz0FOn0Kb8h9EISLJATP2UufU29k8Dqxp0Y=; b=EpQ3RY1bj0fGYLiwYWYAJcmvvOyE/g70AX82qHEe3UwwYftSLG9LFCimysCDJ6zEX9 NEUQqk8aHbtY5tYrMCydkQp5Nn4nj8S0LEoKT+5JLGaPoPDxXprKQh+mLOBb8FySSNrV TeBC/qS/WHYuLvePlss9QSEpVKwEJndV9WdKpDYDO2kWk/3C6Wq5BqQUBtkdPow9kDsR lcWsBAXLzKmSkBK+vFqNLVLx65SehlO1dRCfnPiqOTnF9sWWV5uxHzQTdxY2WKfWISD+ IFfh2EbZpVgJSBCt1b0kdGnry+sin8m+qXGSyyZOSBaiAmh31muNT6UasJLPsJ+EWpXV QCaw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1752560667; x=1753165467; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=/3GeJz9Omz0FOn0Kb8h9EISLJATP2UufU29k8Dqxp0Y=; b=rOS+e8ESo+BwQbTG8mB74RoXYwpzbTnzD5lo9JMpJ3UgipvKY01wBuFpy3in51ROKG Wsd+BaKaxZjgtuSK8cydhH7amJ33vmPzA3UyPs/JgFVUvpDu087wylSM9SMipT4nJ6WG yty4Rf95B9bzADYr3AgPZQwSMk+5xaelufeZSI30HyvllHmT6klCoVLtFOTUm5sFfA0R 5GX2TtldPfmxuhB31SSbDmeZuMkPRIdM+BShi2nzFCNTHj4dpvi0BN8m04+8gRsbuVXe /86DdNoDgj2I67JkFAxI1zutMXu1uU4rOhfS8gWeczNZMIi+0cCoQvREL0XWGphc4853 f5Uw== X-Forwarded-Encrypted: i=1; AJvYcCUMWycDZT6wwxKEGeD6ZvOD9HVtgsaIIS47lzOKjbZm0EXtmWN+woxdii9r82wd4a/efcTbhOYOGGAiOag=@vger.kernel.org X-Gm-Message-State: AOJu0YxdnI24qp5GHZS1OB9coWDd54XR0uqQ6z/iOo4oQ4WxaPOrTuNC K45CNz9O/ssLq6PnVEtNx4qqi11BCj0OMeT3OAJDK9WEtJxi427DPn9l X-Gm-Gg: ASbGncuoxema3vtIDEjtv8xWH180HvQ2RSXtqwy0nbEBHH1pCjm2WEnVCouHLt2d4+i B4FWL05AJIKEry2yOF/dMGXeiO1s6DUJsCsSpa+dJ00vv0ClAEU78aVULahr54B6OfLG7sDf6iT ONe/M+9Fc2EtWOtP/gy4NMOMoMnjDY2e2DCyjuKbLNMZsDsxV1usXjV4JzjtHEu3rvmp2keXixL mf0MSgQcYlwlazhGYnBeO6H5m0InFiB9hA3Hnw+ROCY/q93qCJtopv5PmIpeG3lchbhUc6RRjNm 95Z72TzaLFB9G0cLgb5cVuy2cEbKaq9urSOk6ywVlPuCi9UNiQ0zs6NVopRSUhKN2abP9RIkify iEZxOLV3ngw== X-Google-Smtp-Source: AGHT+IGr5QFN4my7ai4srRYNbiB648JUm4RpfKdWKlSeX2rSE4Qy8CMDRILi7aFyybTbT/54Byj0Lw== X-Received: by 2002:a05:6a21:b8b:b0:21f:5598:4c2c with SMTP id adf61e73a8af0-2311e535ba7mr27840761637.13.1752560667173; Mon, 14 Jul 2025 23:24:27 -0700 (PDT) Received: from ws ([103.167.140.11]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-74eb9f536aesm11729467b3a.137.2025.07.14.23.24.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 14 Jul 2025 23:24:26 -0700 (PDT) From: Xiao Liang To: Steffen Klassert , Daniel Jordan , Herbert Xu Cc: linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] padata: Reset next CPU when reorder sequence wraps around Date: Tue, 15 Jul 2025 14:23:57 +0800 Message-ID: <20250715062401.172642-1-shaw.leon@gmail.com> X-Mailer: git-send-email 2.50.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When seq_nr wraps around, the next reorder job with seq 0 is hashed to the first CPU in padata_do_serial(). Correspondingly, need reset pd->cpu to the first one when pd->processed wraps around. Otherwise, if the number of used CPUs is not a power of 2, padata_find_next() will be checking a wrong list, hence deadlock. Fixes: 6fc4dbcf0276 ("padata: Replace delayed timer with immediate workqueu= e in padata_reorder") Signed-off-by: Xiao Liang --- kernel/padata.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/kernel/padata.c b/kernel/padata.c index 7eee94166357..ebb52c6db637 100644 --- a/kernel/padata.c +++ b/kernel/padata.c @@ -290,7 +290,11 @@ static struct padata_priv *padata_find_next(struct par= allel_data *pd, if (remove_object) { list_del_init(&padata->list); ++pd->processed; - pd->cpu =3D cpumask_next_wrap(cpu, pd->cpumask.pcpu); + /* When sequence wraps around, reset to the first CPU. */ + if (unlikely(pd->processed =3D=3D 0)) + pd->cpu =3D cpumask_first(pd->cpumask.pcpu); + else + pd->cpu =3D cpumask_next_wrap(cpu, pd->cpumask.pcpu); } =20 spin_unlock(&reorder->lock); --=20 2.50.0