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commit 27ba5b67312a944576addc4df44ac3b709aabede upstream. Commit9f356e5a4f("jbd2: Account descriptor blocks into t_outstanding_credits") started to account descriptor blocks into transactions outstanding credits. However it didn't appropriately decrease the maximum amount of credits available to userspace. Thus if the filesystem requests a transaction smaller than j_max_transaction_buffers but large enough that when descriptor blocks are added the size exceeds j_max_transaction_buffers, we confuse add_transaction_credits() into thinking previous handles have grown the transaction too much and enter infinite journal commit loop in start_this_handle() -> add_transaction_credits() trying to create transaction with enough credits available. Fix the problem by properly accounting for transaction space reserved for descriptor blocks when verifying requested transaction handle size. CC: stable@vger.kernel.org Fixes:9f356e5a4f("jbd2: Account descriptor blocks into t_outstanding_credits") Reported-by: Alexander Coffin <alex.coffin@maticrobots.com> Link: https://lore.kernel.org/all/CA+hUFcuGs04JHZ_WzA1zGN57+ehL2qmHOt5a7RMpo+rv6Vyxtw@mail.gmail.com Signed-off-by: Jan Kara <jack@suse.cz> Reviewed-by: Zhang Yi <yi.zhang@huawei.com> Link: https://patch.msgid.link/20240624170127.3253-3-jack@suse.cz Signed-off-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.