linux-ext4 - Re: [PATCH v3] ext4: fix i_data_sem unlock order in ext4_ind

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Message-ID: <172554793835.1268668.9896908315159460691.b4-ty@mit.edu>
Date: Thu,  5 Sep 2024 10:53:40 -0400
From: "Theodore Ts'o" <tytso@....edu>
To: Artem Sadovnikov <ancowi69@...il.com>
Cc: "Theodore Ts'o" <tytso@....edu>, Andreas Dilger <adilger.kernel@...ger.ca>,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        lvc-project@...uxtesting.org, Ritesh Harjani <ritesh.list@...il.com>,
        Mikhail Ukhin <mish.uxin2012@...dex.ru>
Subject: Re: [PATCH v3] ext4: fix i_data_sem unlock order in ext4_ind_migrate()


On Thu, 29 Aug 2024 15:22:09 +0000, Artem Sadovnikov wrote:
> Fuzzing reports a possible deadlock in jbd2_log_wait_commit.
> 
> This issue is triggered when an EXT4_IOC_MIGRATE ioctl is set to require
> synchronous updates because the file descriptor is opened with O_SYNC.
> This can lead to the jbd2_journal_stop() function calling
> jbd2_might_wait_for_commit(), potentially causing a deadlock if the
> EXT4_IOC_MIGRATE call races with a write(2) system call.
> 
> [...]

Applied, thanks!

[1/1] ext4: fix i_data_sem unlock order in ext4_ind_migrate()
      commit: cc749e61c011c255d81b192a822db650c68b313f

Best regards,
-- 
Theodore Ts'o <tytso@....edu>