linux-kernel - [BUG] fs: nfs: pnfs_nfs: a possible sleep-in-atomic-context bug in pnfs_generic_recover_commit

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Message-ID: <6e0b1c99-bfe5-29a9-51b1-1c71fe0b91b4@gmail.com>
Date:   Mon, 13 Aug 2018 11:46:28 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     trond.myklebust@...merspace.com, anna.schumaker@...app.com
Cc:     linux-nfs@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [BUG] fs: nfs: pnfs_nfs: a possible sleep-in-atomic-context bug in
 pnfs_generic_recover_commit_reqs()

The kernel may sleep with holding a spinlock.

The function call paths (from bottom to top) in Linux-4.16 are:

[FUNC] mutex_lock_nested
fs/nfs/write.c, 1045: mutex_lock_nested in nfs_scan_commit_list
fs/nfs/pnfs_nfs.c, 145: nfs_scan_commit_list in 
pnfs_generic_recover_commit_reqs
fs/nfs/pnfs_nfs.c, 154: spin_lock in pnfs_generic_recover_commit_reqs

I do not find a good way to fix, so I only report.
This is found by my static analysis tool (DSAC).


Thanks,
Jia-Ju Bai