NFS: Fix a deadlock involving nfs_release_folio()

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[ Upstream commit cce0be6eb4 ]

Wang Zhaolong reports a deadlock involving NFSv4.1 state recovery
waiting on kthreadd, which is attempting to reclaim memory by calling
nfs_release_folio(). The latter cannot make progress due to state
recovery being needed.

It seems that the only safe thing to do here is to kick off a writeback
of the folio, without waiting for completion, or else kicking off an
asynchronous commit.

Reported-by: Wang Zhaolong <wangzhaolong@huaweicloud.com>
Fixes: 96780ca55e ("NFS: fix up nfs_release_folio() to try to release the page")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Trond Myklebust 2025-12-31 11:42:31 -05:00 • committed by Greg Kroah-Hartman

parent a316fd9d30

commit 49d352bc26

4 changed files with 39 additions and 1 deletions

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3

fs/nfs/file.c

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3

fs/nfs/nfstrace.h

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33

fs/nfs/write.c

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1

include/linux/nfs_fs.h

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