[BUG] Slave crash on dictRehash

[keithchew]

I encountered this crash on a slave node:

7:96:S 28 Feb 2024 21:24:38.284 # KeyDB 6.3.4 crashed by signal: 11, si_code: 1
7:96:S 28 Feb 2024 21:24:38.284 # Accessing address: 0xffffffffffffffff
7:96:S 28 Feb 2024 21:24:38.284 # Crashed running the instruction at: 0x555565361d84

------ STACK TRACE ------
EIP:
/opt/KeyDB/bin/keydb-server *:6379(dictSdsHash(void const*)+0x4) [0x555565361d84]

Backtrace:
/lib/x86_64-linux-gnu/libpthread.so.0(+0x14420) [0x7f30ef17e420]
/opt/KeyDB/bin/keydb-server *:6379(dictSdsHash(void const*)+0x4) [0x555565361d84]
/opt/KeyDB/bin/keydb-server *:6379(dictRehash+0x8f) [0x55556535e10f]
/opt/KeyDB/bin/keydb-server *:6379(+0x226632) [0x555565360632]
/opt/KeyDB/bin/keydb-server *:6379(redisDbPersistentData::incrementallyRehash()+0x49) [0x5555653606a9]
/opt/KeyDB/bin/keydb-server *:6379(databasesCron(bool)+0x2e3) [0x555565362ee3]
/opt/KeyDB/bin/keydb-server *:6379(serverCronLite(aeEventLoop*, long long, void*)+0x9b) [0x555565364cab]
/opt/KeyDB/bin/keydb-server *:6379(aeProcessEvents+0x235) [0x55556535ad85]
/opt/KeyDB/bin/keydb-server *:6379(aeMain+0x3e) [0x55556535b73e]
/opt/KeyDB/bin/keydb-server *:6379(workerThreadMain(void*)+0x12b) [0x55556537472b]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x8609) [0x7f30ef172609]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x43) [0x7f30ef097133]

I have not traced the root cause of the crash, but thought I'd report a bug here first. Will post an update once I dig a bit deeper into this.

[keithchew]

Another crash, but from main thread:

=== KEYDB BUG REPORT START: Cut & paste starting from here ===
7:95:S 28 Feb 2024 21:45:56.344 # KeyDB 6.3.4 crashed by signal: 7, si_code: 128
7:95:S 28 Feb 2024 21:45:56.344 # Accessing address: (nil)
7:95:S 28 Feb 2024 21:45:56.344 # Crashed running the instruction at: 0x558be35a3106

------ STACK TRACE ------
EIP:
/opt/KeyDB/bin/keydb-server *:6379(dictRehash+0x86) [0x558be35a3106]

Backtrace:
/lib/x86_64-linux-gnu/libpthread.so.0(+0x14420) [0x7f5e8943b420]
/opt/KeyDB/bin/keydb-server *:6379(dictRehash+0x86) [0x558be35a3106]
/opt/KeyDB/bin/keydb-server *:6379(+0x226632) [0x558be35a5632]
/opt/KeyDB/bin/keydb-server *:6379(redisDbPersistentData::incrementallyRehash()+0x49) [0x558be35a56a9]
/opt/KeyDB/bin/keydb-server *:6379(databasesCron(bool)+0x2e3) [0x558be35a7ee3]
/opt/KeyDB/bin/keydb-server *:6379(serverCron(aeEventLoop*, long long, void*)+0x2e3) [0x558be35a8b23]
/opt/KeyDB/bin/keydb-server *:6379(aeProcessEvents+0x235) [0x558be359fd85]
/opt/KeyDB/bin/keydb-server *:6379(aeMain+0x3e) [0x558be35a073e]
/opt/KeyDB/bin/keydb-server *:6379(workerThreadMain(void*)+0x12b) [0x558be35b972b]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x8609) [0x7f5e8942f609]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x43) [0x7f5e89354133]