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Mon, 17 Jul 2023 18:57:21 -0700 (PDT) Date: Tue, 18 Jul 2023 07:27:16 +0530 Message-Id: <87h6q2nfr7.fsf@doe.com> From: Ritesh Harjani (IBM) To: Theodore Ts'o Cc: Naresh Kamboju , open list , linux-mm , lkft-triage@lists.linaro.org, linux-ext4 , LTP List , Andrew Morton , Arnd Bergmann , Dan Carpenter , Andreas Dilger , Ojaswin Mujoo Subject: Re: next: kernel BUG at fs/ext4/mballoc.c:4369! In-Reply-To: <20230717213424.GB3842864@mit.edu> X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 8CACD40003 X-Stat-Signature: hq1nia9etzbayugtef417rewr8mscag4 X-Rspam-User: X-HE-Tag: 1689645443-956586 X-HE-Meta: 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 obSnLQQu roKXPYUabEpLF1w86927SxDwV0JmAkg/HnE+6UbPc8lLvtKKjd9Re88i755R1EOxW7eGIvJom24AHtjMd2yGmOV1vv6icor2wVBuiwSExB0VOePaCCHNB0FaNuc0qoX+3Gm0Py0Gzz3Nb8qdiHFgaXXzanffb4Z6AiPgFrRBLD2amDfu4CrRr1glkZQ1Zm4agvd12uT5Om3QdcbC6+jOddJKdwFoJrl4QuX3AovGa/6zeVBy90zBUpCks2CXg0CKRVJQS8OU+EYHhFyxOuhPQI0oVk9zmKvIJGp1+SWtqBZuqR2094XKJXEkTfcElk1R1N217KdrPDofnGYoCYbwgCcGtcbF/iJHiShs8LdTb/19Ik5KepvWBaBsHsvKCXBM8noJdL1H3glyR/UIE3Kq19As5XWOb9S/6Cv26oxcWNJfsw4I= 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, 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 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