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AJvYcCW/rHVuBrADsxzBrCsuKJDiw+a2BaLnooZWb9iEEKHK1h7qVXfKmozONA/DBrMxjUB2lPScu7NW+Q==@kvack.org X-Gm-Message-State: AOJu0YyEKw+fbgGigbnF0tH+ow/C81iM+l17ZE0FFfZ/UVGzK+iFdbRv Afg33CpM7wl1RwRclJ6XaJ1rQ61zIcCl+JdbTQdT0X/Y0EGnyr8Ko4amnCGdrKneDWXAHcyCmiL 0oORwCltdUsfTMus4RCWcRt6fmIc= X-Gm-Gg: ASbGncs77NybGKamHyk874MMkZ/Czq04OPxv7WlackJp8scGFVlRuCKSGYGNYHgh6K6 jmHEj85lDgxyRquSBC2rJOHS3jdlDHPCRNJym/7GoziQEbBDKenqpvjJ3bBo+CTgVzbUghvVi+P c= X-Google-Smtp-Source: AGHT+IFohYzsh69AFMAPOGBjzpqdgJLhpj/draOxVD6z9yyV6DjZ9yTR3e0keblXhrmXJq/A4V6AYCzNz062upvfFIo= X-Received: by 2002:a05:6402:2084:b0:5e0:8c55:52b with SMTP id 4fb4d7f45d1cf-5e08c5515cemr4152501a12.15.1740014897427; Wed, 19 Feb 2025 17:28:17 -0800 (PST) MIME-Version: 1.0 References: <173997003868.2137198.9462617208992136056.stgit@mhiramat.tok.corp.google.com> <8ca57548-4b18-401d-bfda-95bc12216adf@redhat.com> In-Reply-To: <8ca57548-4b18-401d-bfda-95bc12216adf@redhat.com> From: Lance Yang Date: Thu, 20 Feb 2025 09:27:41 +0800 X-Gm-Features: AWEUYZlzlohia0QNps6pKktO2akrT3P7RyQaOiIubTHsvWFO4MwWmKRtSuxY_2I Message-ID: Subject: Re: [PATCH 0/2] hung_task: Dump the blocking task stacktrace To: Waiman Long Cc: mhiramat@kernel.org, Peter Zijlstra , Ingo Molnar , Will Deacon , Andrew Morton , Boqun Feng , Joel Granados , Anna Schumaker , Kent Overstreet , Yongliang Gao , Steven Rostedt , Tomasz Figa , Sergey Senozhatsky , linux-kernel@vger.kernel.org, Linux Memory Management List Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: 4CF06140005 X-Stat-Signature: uzf9r669i1gaw977t5spfcjh6w3ddyif X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1740014899-397248 X-HE-Meta: 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 6a9qF7k9 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.001135, 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 Thu, Feb 20, 2025 at 4:20=E2=80=AFAM Waiman Long wrot= e: > > > On 2/19/25 10:02 AM, Lance Yang wrote: > > On Wed, Feb 19, 2025 at 9:33=E2=80=AFPM Lance Yang wrote: > >> CC linux-mm > >> > >> On Wed, Feb 19, 2025 at 9:00=E2=80=AFPM Masami Hiramatsu (Google) > >> wrote: > >>> Hi, > >>> > >>> The hung_task detector is very useful for detecting the lockup. > >>> However, since it only dumps the blocked (uninterruptible sleep) > >>> processes, it is not enough to identify the root cause of that > >>> lockup. > >>> > >>> For example, if a process holds a mutex and sleep an event in > >>> interruptible state long time, the other processes will wait on > >>> the mutex in uninterruptible state. In this case, the waiter > >>> processes are dumped, but the blocker process is not shown > >>> because it is sleep in interruptible state. > > Cool! I just ran into something similar today, but with rwsem. In that > > case, the blocked process was locked up, and we could not identify > > the root cause either ;( > > Once this patch series is settled down, we can extend rwsem to provide > similar feature. Sounds good! Really looking forward to it ;p Thanks, Lance > > Cheers, > Longman >