On 05.01.22 12:13, Hanna Reitz wrote: [...]
Perhaps for a lack of being aware of all the kinds of tests we have, I found it impossible to write a reproducer in any of our current test frameworks: From how I understand the issue, to reproduce it, you need to issue a TRIM request and immediately cancel it, before ide_trim_bh_cb() (scheduled as a BH) can run. I wanted to do this via qtest, but that does not work, because every port I/O operation is done via a qtest command, and QEMU will happily poll the main context between each qtest command, which means that you cannot cancel an ongoing IDE request before a BH scheduled by it is run. Therefore, I wrote an x86 boot sector that sets up a no-op TRIM request (i.e. one where all TRIM ranges have length 0) and immediately cancels it by setting SRST.
I just realized we could, if we really wanted to, add this to the iotests’ sample_images directory, and then run it from an iotest...
Hanna
