Ubuntu
memcached package

Failed to dump keys: (0x562f7054c330) Illegal slab id, host: localhost:11211

Bug #1847778 reported by psl on 2019-10-11

This bug affects 3 people

Affects		Status	Importance	Assigned to	Milestone
	memcached (Ubuntu)	Confirmed	Undecided	Unassigned

Bug Description

Ubuntu 18.04.3, amd64

I have fresh installed memcached, it is empty.

$ memcdump --debug localhost
Failed to dump keys: (0x562f7054c330) Illegal slab id, host: localhost:11211

$ memcached --version
memcached 1.5.6

How to replicate:

$ apt install memcached libmemcached-tools
$ memcdump --debug localhost

See original description

psl (slansky) on 2019-10-11

description:

updated

Revision history for this message

Glenn J. Schworak (glenn-schworak) wrote on 2019-12-28:

dpkg -l | grep memcached Edit (22.4 KiB, image/png)

I have two servers giving the same error.

Ubuntu 16.04 server returns all the keys then throws this error at the end.

Ubuntu 18.04 server returns all keys some times and skips some other times.

I ran the test many times on each server. 16.04 is stable in what it returns but 18.04 changes each time I run memdump. This is also an issue when running getAllKeys() from php.

All testing demonstrates that the data stored in the cache is working perfectly. It only seems to be the command to get the keys that is causing trouble.

Revision history for this message

Launchpad Janitor (janitor) wrote on 2019-12-28:

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in memcached (Ubuntu):
status:	New → Confirmed

Revision history for this message

Glenn J. Schworak (glenn-schworak) wrote on 2019-12-28:

I forgot to mention there is 1 difference between the two servers.

On 16.04, memcached is version 1.4.25 and on 18.04 it is version 1.5.6. All other items are the same. Both give the error, but Ubuntu 16.04 returns all keys every time.