linux-kernel - [BUG bisected] sysfs: cannot create duplicate filename '/devices/virtual/workqueue/scsi_tmf

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Message-ID: <8d443293-2020-42d9-b5b1-1348f551648f@paulmck-laptop>
Date: Tue, 20 Aug 2024 19:16:00 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: matthew.brost@...el.com
Cc: tj@...nel.org, jiangshanlai@...il.com, sfr@...b.auug.org.au,
	linux-kernel@...r.kernel.org, linux-next@...r.kernel.org
Subject: [BUG bisected] sysfs: cannot create duplicate filename
 '/devices/virtual/workqueue/scsi_tmf_1073822488'

Hello!

Running rcutorture scenario TREE01 on next-20240820 on a dual-socket x86
system (and for that matter on my laptop) got me this warning during boot:

sysfs: cannot create duplicate filename '/devices/virtual/workqueue/scsi_tmf_1073822488'

The number at the end varies from run to run.

Bisection landed here:

b188c57af2b5 ("workqueue: Split alloc_workqueue into internal function and lockdep init")

My reproducer is to run this at the top of the Linux-kernel file tree:

tools/testing/selftests/rcutorture/bin/kvm.sh --allcpus --duration 1m --configs "2*TREE01" --trust-make

Reverting this commit on top of next-20240820 gets me clean runs.

I cannot see how the patch would make this happen, but then again,
I don't know this code at all well.

Thoughts?

						Thanx, Paul