[ALTLinux] [ppc64le] [0.18.0] `AssertionError: Didn't reach a full buffer`

[ancieg]

• uvloop version: 0.18.0 (from tag v0.18.0)
• Python version: 3.11.6
• Platform: ppc64le
• Can you reproduce the bug with PYTHONASYNCIODEBUG in env?: Will report later after try in a virtual machine.
• Does uvloop behave differently from vanilla asyncio? How?: [no info]

The bug is in tests. Fails only on ppc64le platform. More detailed log is here: https://git.altlinux.org/tasks/331829/build/100/ppc64le/log.

Another platforms (the bug doesn't reproduce on them):

• https://git.altlinux.org/tasks/331829/build/100/aarch64/log
• https://git.altlinux.org/tasks/331829/build/100/armh/log
• https://git.altlinux.org/tasks/331829/build/100/i586/log
• https://git.altlinux.org/tasks/331829/build/100/x86_64/log

~~Note: the bug doesn't reproduce in uvloop version 0.17.0 (from tag v0.17.0) on all of the platforms listed above.~~

[fantix]

This is probably because the platform offers a large default size of pipe I/O buffer. The test test_write_buffer_full is assuming the total buffer size is less than 1MB (32 x 32768) to avoid platform-specific pipe buffer manipulation.

If possible, please try increasing the number 32 on ppc64le. Please let me know if that works, PR is also welcome!

[nmeum]

Hi, we are also running into this for our Alpine Linux ppc64le package of uvloop. Increasing the number from 32 to 128 did not fix this build failure for me in a ppc64le qemu-user environment. Therefore, I decided to disable the test for now.