selftests/filesystems: check that a dead mount's overmount isn't followed

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Add overmount_reparent_test:

- a mount that a file descriptor keeps alive after propagate_umount()
  reparented its overmount and unmounted it must not be walked into the
  freed overmount by move_mount(MOVE_MOUNT_BENEATH)

Link: https://patch.msgid.link/20260926-work-mount-fixes-2-v1-10-f357abf3d17b@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

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Christian Brauner 2026-09-26 15:44:33 +02:00

parent 07617913d0

commit 7fbcc793f7

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3 changed files with 183 additions and 1 deletions

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1

tools/testing/selftests/filesystems/mount_cycle/.gitignore vendored

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2

tools/testing/selftests/filesystems/mount_cycle/Makefile

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181

tools/testing/selftests/filesystems/mount_cycle/overmount_reparent_test.c

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