Re: [PATCH v2] md/raid5-ppl: fix use-after-free in ppl_do_flush()

[Brigham Campbell]

On Mon Jun 22, 2026 at 8:06 AM MDT, Sajal Gupta wrote:
> Compile tested only.

It looks like you're on the right track, but this could use some
testing. My analysis here may be incorrect, but it looks like it should
be pretty easy to test this patch by compiling and running on a system
with a RAID5 array, PPL enabled, and no RAID journal. I expect the call
stack would look something like the following (feel free to correct me,
anyone...):

ppl_do_flush
ppl_stripe_write_finished
log_stripe_write_finished
handle_stripe
...

To be sure, you can add a tracepoint[^1] inside ppl_do_flush.

Dan was probably reluctant to make the change himself, opting to instead
submit a KTODO because the change is relatively straightforward, but
testing is a little more involved. Testing is particularly important
with respect to subsystems pertaining to the filesystem because latent
regressions could mean permanent data loss.

Cheers,
Brigham

[1]: https://docs.kernel.org/trace/tracepoints.html