[PATCH 0/1] selftests/arm64: GCS must survive io_uring SQPOLL worker exit

[Iván Ezequiel Rodriguez]

As suggested, a separate kselftest for the io_uring/SQPOLL worker
path that gcs_reset_thread() also covers.

SQPOLL is create_io_thread() (args->fn + CLONE_VM). Without the reset,
worker exit unmaps the parent's GCS. The test waits for iou-sqp-* to
leave /proc/self/task after close (teardown is async), then checks the
parent ss VMA count.

QEMU virt/max: pass with the reset; SIGSEGV on an unpatched kernel.

Iván Ezequiel Rodriguez (1):
  selftests/arm64: GCS must survive io_uring SQPOLL worker exit

 tools/testing/selftests/arm64/gcs/Makefile    |   2 +-
 .../selftests/arm64/gcs/gcs-uring-worker.c    | 254 ++++++++++++++++++
 2 files changed, 255 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/arm64/gcs/gcs-uring-worker.c

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2.43.0