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Date: Mon, 27 Dec 2021 00:34:39 -0500 From: "Theodore Ts'o" <tytso@....edu> To: adilger.kernel@...ger.ca, brookxu <brookxu.cn@...il.com> Cc: "Theodore Ts'o" <tytso@....edu>, riteshh@...ux.ibm.com, linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org, jack@...e.cz Subject: Re: [PATCH v3] ext4: fix a possible ABBA deadlock dued to busy PA On Tue, 23 Nov 2021 09:17:57 +0800, brookxu wrote: > From: Chunguang Xu <brookxu@...cent.com> > > We found on older kernel (3.10) that in the scenario of insufficient > disk space, system may trigger an ABBA deadlock problem, it seems that > this problem still exists in latest kernel, try to fix it here. The > main process triggered by this problem is that task A occupies the PA > and waits for the jbd2 transaction finish, the jbd2 transaction waits > for the completion of task B's IO (plug_list), but task B waits for > the release of PA by task A to finish discard, which indirectly forms > an ABBA deadlock. The related calltrace is as follows: > > [...] Applied, thanks! [1/1] ext4: fix a possible ABBA deadlock dued to busy PA commit: 1754b684bf05c9c00b40e745a57f9ca9696ad9c1 Best regards, -- Theodore Ts'o <tytso@....edu>
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