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When the journal I/O depth reaches FULL, RecordSubmitter waits for an outstanding I/O to complete before flushing the pending batch. When an outstanding I/O completes, decrement_io_with_flush() is called to release an I/O slot and flush the pending batch if RecordSubmitter was FULL. In decrement_io_with_flush(), flush_current_batch() is called before wait_unfull_flush_promise is resolved and reset. Note that flushing the batch may trigger another I/O completion callback, re-entering decrement_io_with_flush() before the promise is reset. Since wait_unfull_flush_promise is still present, the reentrant call attempts to flush the current batch again, even though the first flush has already submitted its records and replaced the current batch with an empty one. This can result in encode_records() being called with an empty record group, causing the metadata length assertion to fail: ceph_assert(bl.length() == record_group.size.get_raw_mdlength()); To prevent this, move wait_unfull_flush_promise to a local variable and reset the optional before calling flush_current_batch(). Signed-off-by: Myoungwon Oh <ohmyoungwon@gmail.com>
Matan-B
approved these changes
Oct 25, 2026
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When the journal I/O depth reaches FULL, RecordSubmitter waits for an outstanding I/O to complete before flushing the pending batch.
When an outstanding I/O completes, decrement_io_with_flush() is called to release an I/O slot and flush the pending batch if RecordSubmitter was FULL.
In decrement_io_with_flush(), flush_current_batch() is called before wait_unfull_flush_promise is resolved and reset. Note that flushing the batch may trigger another I/O completion callback, re-entering decrement_io_with_flush() before the promise is reset.
Since wait_unfull_flush_promise is still present, the reentrant call attempts to flush the current batch again, even though the first flush has already submitted its records and replaced the current batch with an empty one.
This can result in encode_records() being called with an empty record group, causing the metadata length assertion to fail:
ceph_assert(bl.length() == record_group.size.get_raw_mdlength());
To prevent this, move wait_unfull_flush_promise to a local variable and reset the optional before calling flush_current_batch().
Signed-off-by: Myoungwon Oh ohmyoungwon@gmail.com
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