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It looks like I was "lucky" to reproduce the issue. I need t= o take a > > > deeper look into the issue. But your patch is not responsible for the= issue. Let > > > me spend some time to analyze the issue reason and environment. > > >=20 > > > Have you able to reproduce the issue on your side? > >=20 > > I=E2=80=99ve tried generic/701 again for several times, but no issues o= ccurred. > >=20 >=20 > I assume that running only generic/701 test-case alone cannot reproduce t= he > issue. My understanding is that the whole auto group needs to be executed. > Somehow, I was lucky enough to reproduce the issue. :) >=20 > > Judging only from the stack trace, I believe it=E2=80=99s a deadlock be= tween > > writeback and memory reclaiming. This dependency chain is as follows > >=20 > > 1. Several D threads are waiting for the osdc->lock to be released.=20 > > 2. The osdc->lock is held by kworker/u32:0:241092 which is performing w= riteback, > > and kworker/u32:0:241092 is asking for con->mutex to send_request. > > 3. The con->mutex is held by kworker/7:4:308292 which is currently call= ing do_sendmsg() > >=20 > > Because of memory shortage, step 3 has to reclaim memory and wait for s= tep 2 to writeback > > And free some folios. But step 2 is blocked by con->mutex which is alre= ady held by step3. > >=20 >=20 > I am going to take a deeper look into the issue today. But, probably, one= day > could be not enough. :) >=20 >=20 As far as I can see, then main problem is the memory pressure issue. And it looks like that this patch can fix the issue: From 84572f7fcb7aad422c71c87b52dfea805eeb7fbd Mon Sep 17 00:00:00 2001 From: Hristo Venev Date: Mon, 6 Apr 2026 16:01:20 +0300 Subject: [PATCH] ceph: put folios not suitable for writeback The batch holds references to the folios (see `filemap_get_folios`, `folio_batch_release`), so we need to `folio_put` the folios we remove. --- fs/ceph/addr.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c index 390f122feeaa..10110af74715 100644 --- a/fs/ceph/addr.c +++ b/fs/ceph/addr.c @@ -1329,6 +1329,7 @@ int ceph_process_folio_batch(struct address_space *mapping, if (rc =3D=3D -ENODATA) { rc =3D 0; folio_unlock(folio); + folio_put(folio); ceph_wbc->fbatch.folios[i] =3D NULL; continue; } else if (rc =3D=3D -E2BIG) { @@ -1340,6 +1341,7 @@ int ceph_process_folio_batch(struct address_space *mapping, if (!folio_clear_dirty_for_io(folio)) { doutc(cl, "%p !folio_clear_dirty_for_io\n", folio); folio_unlock(folio); + folio_put(folio); ceph_wbc->fbatch.folios[i] =3D NULL; continue; } --=20 2.53.0 I am going to run the xfstests without this patch again to check that issue= will be reproducible again. Thanks, Slava.