linux-ext4 - [Bug 200069] BUG() triggered in start_this_handle() (jbd2/transaction.c) when operating and umounting a crafted ext4 image

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Date:   Fri, 15 Jun 2018 14:13:30 +0000
From:   bugzilla-daemon@...zilla.kernel.org
To:     linux-ext4@...nel.org
Subject: [Bug 200069] BUG() triggered in start_this_handle()
 (jbd2/transaction.c) when operating and umounting a crafted ext4 image

https://bugzilla.kernel.org/show_bug.cgi?id=200069

--- Comment #3 from Wen Xu (wen.xu@...ech.edu) ---
Created attachment 276575
  --> https://bugzilla.kernel.org/attachment.cgi?id=276575&action=edit
A simplified image

I feel hard to simplify this corrupted image but meanwhile still keep hitting
the BUG(). Right now I just upload a simplified image that leads to this error
by poc.c:

[  516.384286] EXT4-fs (loop0): mounted filesystem with ordered data mode.
Opts: (null)
[  531.719394] jbd2_journal_bmap: journal block not found at offset 7 on
loop0-8
[  531.721009] Aborting journal on device loop0-8.
[  531.851971] EXT4-fs error (device loop0): ext4_journal_check_start:61:
Detected aborted journal
[  531.854414] EXT4-fs (loop0): Remounting filesystem read-only

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