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Thu, 1 May 2025 17:20:31 +0000 (GMT) Message-ID: <03cf3cd2-8ddc-45ed-81ee-3cf8537f4163@linux.ibm.com> Date: Thu, 1 May 2025 22:50:30 +0530 Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RESEND] Circular locking dependency involving, elevator_lock, rq_qos_mutex and pcpu_alloc_mutex To: Tejun Heo Cc: Jakub Kicinski , Jens Axboe , cgroups@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Christoph Hellwig , Ming Lei References: <16ed195d-7f26-41bb-86d6-ea961b3fa691@linux.ibm.com> Content-Language: en-US From: Nilay Shroff In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNTAxMDEzMCBTYWx0ZWRfX0JDWXh1wxDHm 634egpdyDBc66J+9W+T+lNNaVlqmksFIAAbdListyuYjFnCgffb4OBOfW/+/qmfvW3UCnaDoLgF bxS6FM5Vw9FJz5n7SL2DoKTaeAUxc7zzKah6rh4XGuv0JvLLcNA6UrWH2kj3DcbVcQhwmpJkCwP tXLeiDHF4zsydfdbeCjfuOXutFEUv+o3rKlAlN+Ypy0W5a3nk4NxY/3uJYZLis+1+rSRaJLOPGj atg5lXT0skIMSsTAy8G/kwfMQL3QFMWvaYLuhfbR8Ywbu3JV9EAi5KsgPnwKcQjk2Ejud86ZLq8 qz8TFkyux9fYweaJuWeTQsMef0R1u8j1rzq2cAJcKCFpkpyrQjMVy0ak2quwk6k1s43ZZpKyygn YuIiX2ZTZpJnChuayR65GrhgYkJb9md6Hz0TqaQDVrrHo9El8/mf/banrNxb1FoOHmBoVbFc X-Authority-Analysis: v=2.4 cv=FOYbx/os c=1 sm=1 tr=0 ts=6813ad65 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=IkcTkHD0fZMA:10 a=dt9VzEwgFbYA:10 a=VwQbUJbxAAAA:8 a=1XWaLZrsAAAA:8 a=20KFwNOVAAAA:8 a=_59lq8m8a_vSe2DXwIAA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-ORIG-GUID: r-WYz8SopHU7u6eDCPTtrQgAzrVM9WOt X-Proofpoint-GUID: r-WYz8SopHU7u6eDCPTtrQgAzrVM9WOt X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.0.736,FMLib:17.12.80.40 definitions=2025-05-01_06,2025-04-24_02,2025-02-21_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 priorityscore=1501 adultscore=0 malwarescore=0 mlxlogscore=810 spamscore=0 lowpriorityscore=0 impostorscore=0 suspectscore=0 clxscore=1015 bulkscore=0 mlxscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2504070000 definitions=main-2505010130 On 5/1/25 10:30 PM, Tejun Heo wrote: > Hello, > > On Tue, Apr 08, 2025 at 12:32:50PM +0530, Nilay Shroff wrote: >> Thanks for the report! This is now a known issue. And we're currently working on >> it to cut dependency of q->io_lockdep_map (or queue freeze-lock) on q->elevator_lock. >> Please see below :https://lore.kernel.org/linux-block/67e6b425.050a0220.2f068f.007b.GAE@google.com/ >> https://lore.kernel.org/all/20250403105402.1334206-1-ming.lei@redhat.com/ > > Any progress on this? The last activity on the threads seems to be back on > Apr 10th and we're getting close to rc5. If we need to revert, I think it's > about time to decide. > > Thanks. > This is currently actively being worked upon. Please see here : https://lore.kernel.org/all/20250430043529.1950194-1-ming.lei@redhat.com/ We expect it to be soon ready for merge. Thanks, --Nilay