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Date:   Wed, 18 Nov 2020 10:30:31 +0000
From:   bugzilla-daemon@...zilla.kernel.org
To:     linux-ext4@...r.kernel.org
Subject: [Bug 210185] kernel BUG at fs/ext4/page-io.c:126!

https://bugzilla.kernel.org/show_bug.cgi?id=210185

--- Comment #4 from emchroma@...il.com ---
(In reply to Theodore Tso from comment #3)

Hi Theodore,

> How easily can you reproduce the problem?  

on each invocation.

> Can you give us instructions for a reliable repro (e.g., download AutoCtk,
> run it with these options and this input file, and it will crash in N
> minutes)?

You'll need Anaconda, Ngspice and AutoCkt. I'm on debian and I've apt-get
ngspice. I'll try a step by step procedure for Anaconda and AutoCkt

We're using https://repo.anaconda.com/archive/Anaconda3-2020.02-Linux-x86_64.sh
Download and install Anaconda

# activate base environment
$ . .bashrc

# upgrade pip
$ pip install --upgrade pip

# download AutoCkt
$ git clone https://github.com/ksettaluri6/AutoCkt.git

# create autockt_updated environment, use the attached autockt_updated.yml,
# not the environment provided by AutoCkt
$ conda env create -f autockt_updated.yml

# activate environment autockt_upgraded
$ conda activate autockt_updated

# copy the attached parameter file to AutoCkt/autockt
$ cp val_autobag_ray_hyperparameter_tuning.py AutoCkt/autockt

# run AutoCkt
$ cd AutoCkt
$ python autockt/gen_specs.py --num_specs 600
$ ipython
$ run autockt/val_autobag_ray_hyperparameter_tuning.py # this is in the IPython
shell

AutoCkt creates a lot of files in /tmp/ckt_da and /tmp/ray. tmp is on the root
partition and
our root is rather small (100G), therefore we start a python script to delete
files/directories
older than 10 minutes in /tmp/ckt_da from a second shell

# cleanup /tmp/ckt_da
$ python auto_delete_old_tmp_ckt_da_files.py

AutoCkt is very verbose and you'll probably see some warnings, but it should
run. On our machines
it usually takes 10-15 minutes, sometimes up to 30 minutes until the bug
appears.

Not sure whether it matters, but we're using software raid1 for the root
partition.

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