tests/bcachefs: cover compaction after migration pressure - #78
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Covers koverstreet/bcachefs#832.
Add a bcachefs ktest for the CONFIG_MIGRATION/compaction crash class reported in koverstreet/bcachefs#832. The test mounts and exercises a bcachefs scratch device, touches a large bounded userspace allocation, frees it, then repeatedly triggers
/proc/sys/vm/compact_memoryso the harness catches anyBUG:/Oops:emitted by compaction/migration after bcachefs activity.Validation:
bash -n tests/fs/bcachefs/compaction_migration.ktesttests/fs/bcachefs/compaction_migration.ktest list-teststests/fs/bcachefs/compaction_migration.ktest depsgit diff --checkcargo buildcodex review --base origin/master