Unit test failed because of error "pure virtual method called"

[doitian]

Environment

• CKB version: v0.100.0-pre
• Chain: N/A
• Operating system: Linux
• Arch: x64
• Installation: Built from source

Describe the bug

Unit test sometimes failed because of "pure virtual method called" recently, such as in this ci check.

As recommended by @xxuejie , I try to reproduce it using rr.

• Find out the test binary file like /home/ian/codebase/nervos/ckb/target/debug/deps/ckb_sync-60892a517e6c0f11

• Run it and record using rr in a loop until the error occurs.

  while rr record /home/ian/codebase/nervos/ckb/target/debug/deps/ckb_sync-60892a517e6c0f11; do
      sleep 1
  done
  

• Remember the last test case before the test quits. Now replay it in the debugger.

  rr replay --debugger rust-gdb
  gdb> break ckb_sync::synchronizer::tests::test_process_new_block
  gdb> run
  gdb> next
  

After several next, the error occurs again, then check the backtrace (attached below).

From the backtrace, we can see that the root cause is RocksDB. The test quits without closing the database first, as mentioned in the comment facebook/rocksdb#649 (comment) . The database is opened by TestNode. The test node does not exit gracefully, which leads to the error.

Attachments

• Backtrace gdb.txt