[Bug 219504] iomap/buffered-io/XFS crashes with kernel Version > 6.1.91. Perhaps Changes in kernel 6.1.92 (and up) for XFS/iomap causing the problems?

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=219504

--- Comment #5 from marco.nelissen@gmail.com ---
With the big caveat that I'm completely unfamiliar with this code, it seems
to me the problem is that here:
https://github.com/torvalds/linux/blame/ccb98ccef0e543c2bd4ef1a72270461957f3d8d0/mm/filemap.c#L2989
"bsz" is a 32-bit type on 32-bit kernels, and so when it gets used later
in that same function to mask the 64-bit "start" value with "~(bsz - 1)",
it's effectively truncating "start" to 32 bits.
This is more or less confirmed by the actual values of "start_byte" and
"punch_start_byte" when that WARN_ON_ONCE in buffer-io.c triggers, with
one being (close to) a 32-bit truncated version of the other.
Changing bsz to a 64-bit type fixes the problem for me.

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