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charset="utf-8" Content-ID: Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Subject: RE: [PATCH v2] ceph: Fix kernel crash in generic/397 test X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-01-29_04,2025-01-29_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 impostorscore=0 lowpriorityscore=0 malwarescore=0 suspectscore=0 mlxscore=0 bulkscore=0 phishscore=0 mlxlogscore=999 spamscore=0 adultscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2411120000 definitions=main-2501290148 On Wed, 2025-01-29 at 13:41 +0000, David Howells wrote: > Viacheslav Dubeyko wrote: >=20 > > > Do you want me to push a branch with my tracepoints that I'm using so= mewhere > > > that you can grab it? > >=20 > > Sounds good! Maybe it can help me. :) >=20 > Take a look at: >=20 > https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/= =20 >=20 > The "ceph-folio" branch has Willy's folio conversion patches plus a traci= ng > patch plus a patch that's an unsuccessful attempt by me to fix the hang I= was > seeing. >=20 > The tracepoint I'm using (netfs_folio) takes a folio pointer, so it was e= asier > to do it on top of Willy's patches. >=20 > The "netfs-crypto" branch are my patches to implement content crypto in > netfslib. I've tested them to some extent with AFS, but the test code I = have > in AFS only supports crypto of files where the file is an exact multiple = of > page size as AFS doesn't support any sort of xattr and so I can't store t= he > real EOF pointer so simply. >=20 > The "ceph-iter" branch are my patches on top of a merge of those two > (excluding the debugging patches) to try and convert ceph to fully using > netfslib and to pass an iterator all the way down to the socket, aiming to > reduce the number of data types to basically two. >=20 Great! Thanks a lot. I believe I have been found all current issues in ceph_writepages_start(). So, I need to clean up the current messy state of the fix and the method it= self. Let me make this clean up, test the fix (probably, I could have some issues= with the fix yet), and share the patch finally. As far as I can see, there are several issues in ceph_writepages_start(): (1) We have double lock issue (reason of the hang); (2) We have issue with not correct place for folio_wait_writeback(); (3) The ceph_inc_osd_stopping_blocker() could not provide guarantee of wait= ing finishing all dirty memory pages flush. It's racy now, as far as I can see.= But I need to check it more accurately by testing. (4) The folio_batch with found dirty pages by filemap_get_folios_tag() is n= ot processed properly. And this is why some number of dirty pages simply never processed and we still have dirty pages after unmount. (5) The whole method of ceph_writepages_start() is huge and messy for my ta= ste and this is the reason of all of these issues (it's hard to follow the logi= c of the method in this unreasonable complexity). Thanks, Slava.