[DRBD-user] drbd writes "BUG!..." to syslog...?

Rudolph Bott rb at megabit.net
Thu Nov 15 22:08:09 CET 2007

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

Hey folks,

I stumbled over something weird in my drbd-setup:

- two boxes (actually not identical besides the whole storage subsystem and the software setup)
- debian etch, drbd 8 packages von backports.debian.org
- standard distro kernel (2.6.18-5-686)
- S-ATA disks, bundled in RAID-5, DRBD on top of the md-device
- DRBD Version from /proc/drbd:
version: 8.0.4 (api:86/proto:86)
SVN Revision: 2947 build by root at nas01, 2007-11-08 16:36:25

After a split brain situation I told the secondary to --discard-my-data and did a "drbdadm connect" on both nodes

The following appeared on the primary's dmesg:

drbd0: Handshake successful: DRBD Network Protocol version 86
drbd0: Split-Brain detected, manually solved. Sync from this node
drbd0: peer( Unknown -> Secondary ) conn( WFReportParams -> WFBitMapS ) pdsk( DUnknown -> UpToDate )
drbd0: Writing meta data super block now.
drbd0: BUG! md_sync_timer expired! Worker calls drbd_md_sync().
drbd0: conn( WFBitMapS -> SyncSource ) pdsk( UpToDate -> Inconsistent )
drbd0: Began resync as SyncSource (will sync 495616 KB [123904 bits set]).
drbd0: Writing meta data super block now.

What exactly is this "BUG!"-line telling me here? Is that an actual problem?

Mit freundlichen Grüßen / with kind regards

Rudolph Bott
Megabit Informationstechnik GmbH
Karstr.25  41068 Moenchengladbach  Tel:02161/30898-0  Fax:-18
AG MG HRB 10141, GF: Dipl.-Ing. Thomas Tillig, Michael Benten

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