linux-kernel - Re: [PATCH v2] hung_task: Dump blocker task if it is not hung

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Message-ID: <l27knfwpljnsgwvc47ifxtrwtuwaireojejiozjioqab5va65l@vrkuak2n3hll>
Date: Thu, 31 Jul 2025 12:37:05 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Lance Yang <lance.yang@...ux.dev>
Cc: Sergey Senozhatsky <senozhatsky@...omium.org>, 
	"Masami Hiramatsu (Google)" <mhiramat@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, 
	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>, 
	Boqun Feng <boqun.feng@...il.com>, Waiman Long <longman@...hat.com>, 
	Joel Granados <joel.granados@...nel.org>, Anna Schumaker <anna.schumaker@...cle.com>, 
	Lance Yang <ioworker0@...il.com>, Kent Overstreet <kent.overstreet@...ux.dev>, 
	Yongliang Gao <leonylgao@...cent.com>, Steven Rostedt <rostedt@...dmis.org>, 
	Tomasz Figa <tfiga@...omium.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] hung_task: Dump blocker task if it is not hung

On (25/07/31 11:25), Lance Yang wrote:
> > > Wrote a simple 3 tasks circular lock test (same that I had in real
> > > life).  The output looks good:
> > 
> > Nice work! The log is now much clearer ;)
> 
> Forgot to add:
> 
> This circular lock test is great. It would be very valuable to have
> it in samples/hung_task ;)
> 
> Would you be willing to submit it as a patch?

Well, that particular test is a deadlock, not sure how useful a test
that deadlocks is going to be.  We probably need some alternative if
we want to test backtrace de-dup.