From: Jia-Ju Bai <baijiaju1990@gmail.com>
To: akpm@linux-foundation.org, jack@suse.cz,
mgorman@techsingularity.net, ak@linux.intel.com,
mawilcox@microsoft.com, viro@zeniv.linux.org.uk,
mawilcox@microsoft.com, ross.zwisler@linux.intel.com
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linux-fsdevel <linux-fsdevel@vger.kernel.org>
Subject: [BUG] mm: truncate: a possible sleep-in-atomic-context bug in truncate_exceptional_pvec_entries()
Date: Mon, 13 Aug 2018 11:10:23 +0800 [thread overview]
Message-ID: <f863cf8d-615f-c622-812a-a6370efe757b@gmail.com> (raw)
The kernel may sleep with holding a spinlock.
The function call paths (from bottom to top) in Linux-4.16 are:
[FUNC] schedule
fs/dax.c, 259: schedule in get_unlocked_mapping_entry
fs/dax.c, 450: get_unlocked_mapping_entry in __dax_invalidate_mapping_entry
fs/dax.c, 471: __dax_invalidate_mapping_entry in dax_delete_mapping_entry
mm/truncate.c, 97: dax_delete_mapping_entry in
truncate_exceptional_pvec_entries
mm/truncate.c, 82: spin_lock_irq in truncate_exceptional_pvec_entries
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
next reply other threads:[~2018-08-13 3:10 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-13 3:10 Jia-Ju Bai [this message]
2018-08-13 8:56 ` [BUG] mm: truncate: a possible sleep-in-atomic-context bug in truncate_exceptional_pvec_entries() Jan Kara
2018-08-13 9:30 ` Jia-Ju Bai
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