Checksum verification wasn't working correctly on reads of small initial offsetted writes
from the journal (until the write was flushed to "clean" metadata).
It could in theory lead to hung operations on RDMA client disconnections.
Workflow (probable):
* OSD switches an outbound connection to PEER_RDMA and removes the FD from epoll
* But a receive request in io_uring is still active
* Receive response is never handled, refs remains > 0
* The connection is dropped, but osd_client_t is not destroyed because refs > 0
* Outbound ops are not canceled, suboperations hang, primary operations hang too
A single urgent fix for the new store: metadata was written incorrectly when
filled metadata area exceeded 4 GB due to a simple & stupid 32-bit integer overflow.
This was leading to OSDs corrupting metadata and being unable to start on the next
run.
The bug affected only the new store (meta_format=3) and OSDs with metadata area size
larger than 4 GB. You can check your OSD metadata area size by checking `data_offset`
in `vitastor-disk read-sb /dev/vitastor/osdXX-data` for single-disk OSDs or
`blockdev --getsize64 /dev/vitastor/osdXX-meta` for hybrid OSDs.
If you're affected, it's highly recommended to:
- Install updated packages without restarting OSDs
- Restart OSDs **one by one**
- If a restart of an OSD triggers "has_degraded" rebalance - wait for it to finish
before restarting another OSD
- If an OSD fails to start with "double-claimed" errors in the log - purge and recreate it,
and again wait for "has_degraded" rebalance to finish before proceeding to the next OSD
New store bug fixes:
- Fix very slow OSD startup (hours) possible in unlucky cases
- Fix incorrect garbage entry validation on start in some cases, preventing OSD startup
- Fix small_write_throttling not functioning and either hanging or crashing OSDs
- Fix "different fact_versions returned from subops" error possible with EC in some cases
- Add a recovery option for the new store: skip_corrupted_meta_entries
- Disable intent writes (even 4k) for hybrid OSDs by default for better write buffering
Other changes:
- Fix chmod/chown of a new empty VitastorFS root directory not working
- Fix vitastor-dd treating all < 32k reads as always empty
- Fix vitastor-disk always setting 32k csum_block_size for HDDs when checksums are enabled
- Fix OSD missing PG state updates and PGs hanging in "starting" in rare cases
- Fix a possible OSD crash with "map::at" message in rare cases when stopping a client
- Fix a possible OSD crash on start when RDMA is available but fails to initialize
- Fix removal and overwriting of totaled objects (objects with all corrupted copies)
- Do not allow data_block_size < 8*bitmap_granularity
- Remove RDMA ODP (On-Demand Paging) support
- Update antietcd to 1.2.4
- Update Docker build to Debian Trixie
- Add packages for AlmaLinux 10
Vitaliy Filippov