This has now been release in 5.15.174:
commit 31545f4b7cdb6da6a0519120b8c96dc40f186aac
Author: Trond Myklebust <trond.mykleb...@hammerspace.com>
Date: Mon Aug 1 14:16:51 2022 -0400
NFS: nfs_async_write_reschedule_io must not recurse into the
writeback code
commit b1a28f2eb9ea7a5a1763fe53fe699aa0feae4231 upstream.
It is not safe to call filemap_fdatawrite_range() from
nfs_async_write_reschedule_io(), since we're often calling from a page
reclaim context. Just let fsync() redrive the writeback for us.
Signed-off-by: Trond Myklebust <trond.mykleb...@hammerspace.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
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https://bugs.launchpad.net/bugs/2089410
Title:
NFS: fix deadlock with pNFS flexfiles IO retry error path
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