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Message-ID: <20230718091031.GB1140910@pevik> Reply-To: Petr Vorel References: <20230717213424.GB3842864@mit.edu> <87h6q2nfr7.fsf@doe.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87h6q2nfr7.fsf@doe.com> X-Rspamd-Queue-Id: 2DB324000E X-Rspam-User: X-Rspamd-Server: rspam02 X-Stat-Signature: qu4ay8xchf8uwp3g3to8g7i3m3fohgcw X-HE-Tag: 1689671435-707166 X-HE-Meta: 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 L7Eor5eG vzpb40C41RmLMHS2ekCU2Rn5J568q3DCaUClBDq7NUI3TjoIeUqr3wTJgBRDODb3ykTQR9OLkYoWiKIGQLHpvATTWYQ1QyAAFtYDsKCqveDJUXS5JBNu/w3+0mgVmHqwz+uzW90SCNAHlGJBmda833OZmNJ+xpDFJkKuEDk6x58wB1Us5h3XiEh/lHAiaG02uWJsqw/jOvBQf/p5mXUfSvz99asPUmvn4f4g5JyKJ/dlmXHc5oWW7EfglKbuiLMHb3tWjpUffac8E/E3dXkCETUSO/adZkq/4+gYNx/Q6qrbvPb+NVDre9Sf4gh393Js3kCTH2uoN2Pqxwm1QN09Na9fLsMy05/mn6hI9Po8fFvLiBPvdtWBquZiLYirrwlAHW2srdk4uI6b9GYFUU5XMh7gedgLJWtLtG0+62apW8qQ+reM= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: > "Theodore Ts'o" writes: > > On Mon, Jul 17, 2023 at 08:04:54PM +0530, Ritesh Harjani wrote: > >> These can basically trigger in extremely low memory space and only when > >> such ranges exist in the PA rbtree. Hence, I guess it is a little hard > >> to tigger race. > > Ritesh, thanks for looking into this! > > Naresh, how easy is it for you to trigger the BUG when using LTP? I > > did two xfstests runs using "gce-xfstests -c ext2/default -g auto", > > one on the ext4 dev branch, and one on linux-next 20230717, and I > > wasn't able to trigger the BUG. > > If you can trivially trigger it using LTP (perhaps with a low memory > > configuration in your test setup?), that would be useful to know. > Hi Ted, Hi Ted, Ritesh, all, > Sorry for wrong choice of words. By low memory space I meant low disk > space i.e. ENOSPC test (fs_fill). I reproduced it like this - > root@ubuntu:/opt/ltp# while [ 1 ]; do ./runltp -s fs_fill; sleep 1; done Late, but better than never: LTP C tests can be run without any wrapper. e.g. to reproduce the bug triggered by fs_fill, you can just: git clone https://github.com/linux-test-project/ltp.git && cd ltp ./ci/your-distro.sh # optionally install the dependencies make autotools ./configure cd testcases/kernel/fs/fs_fill/ make -j`nproc` while true; do ./fs_fill; sleep 1; done NOTE: runltp is 1) deprecated, replaced by runltp-ng [1] 2) again, there is no need to use this shell wrapper to run a single C binary Kind regards, Petr [1] https://github.com/linux-test-project/runltp-ng > For me it took around ~1-2 hours for it to reproduce when I tried again. > I am hoping if we run generic/269 (fsstress ENOSPC) in a while loop like > this maybe it can hit this bug. But I didn't give it a shot. > -ritesh