May 23 20:13:53 z2-12 kernel: [2621827.489589] block drbd15: PingAck did not arrive in time.
May 23 20:13:53 z2-12 kernel: [2621827.489621] block drbd15: peer( Primary -> Unknown ) conn( Connected -> NetworkFailure ) pdsk( UpToDate -> DUnknown )
May 23 20:13:53 z2-12 kernel: [2621827.489674] block drbd15: asender terminated
May 23 20:13:53 z2-12 kernel: [2621827.489697] block drbd15: Terminating asender thread
May 23 20:13:53 z2-12 kernel: [2621827.489703] block drbd15: short read expecting header on sock: r=-512
May 23 20:13:54 z2-12 kernel: [2621828.120341] block drbd15: Connection closed
May 23 20:13:54 z2-12 kernel: [2621828.120369] block drbd15: conn( NetworkFailure -> Unconnected )
May 23 20:13:54 z2-12 kernel: [2621828.120400] block drbd15: receiver terminated
May 23 20:13:54 z2-12 kernel: [2621828.120424] block drbd15: Restarting receiver thread
May 23 20:13:54 z2-12 kernel: [2621828.120450] block drbd15: receiver (re)started
May 23 20:13:54 z2-12 kernel: [2621828.120477] block drbd15: conn( Unconnected -> WFConnection )
May 23 20:13:54 z2-12 kernel: [2621828.261661] block drbd15: Handshake successful: Agreed network protocol version 91
May 23 20:13:54 z2-12 kernel: [2621828.275905] block drbd15: Peer authenticated using 16 bytes of 'md5' HMAC
May 23 20:13:54 z2-12 kernel: [2621828.275937] block drbd15: conn( WFConnection -> WFReportParams )
May 23 20:13:54 z2-12 kernel: [2621828.276018] block drbd15: Starting asender thread (from drbd15_receiver [9152])
May 23 20:13:54 z2-12 kernel: [2621828.276145] block drbd15: data-integrity-alg: <not-used>
May 23 20:13:54 z2-12 kernel: [2621828.289572] block drbd15: drbd_sync_handshake:
May 23 20:13:54 z2-12 kernel: [2621828.289599] block drbd15: self 5CE0F38EF7B4E046:0000000000000000:4B79EEE1F60A5964:8F8CB468AAB46E71 bits:0 flags:0
May 23 20:13:54 z2-12 kernel: [2621828.289647] block drbd15: peer 9570B073D5D62D3F:5CE0F38EF7B4E047:4B79EEE1F60A5964:8F8CB468AAB46E71 bits:0 flags:0
May 23 20:13:54 z2-12 kernel: [2621828.289693] block drbd15: uuid_compare()=-1 by rule 50
May 23 20:13:54 z2-12 kernel: [2621828.289721] block drbd15: peer( Unknown -> Primary ) conn( WFReportParams -> WFBitMapT ) pdsk( DUnknown -> UpToDate )
May 23 20:13:55 z2-12 kernel: [2621829.154135] block drbd15: conn( WFBitMapT -> WFSyncUUID )
May 23 20:13:55 z2-12 kernel: [2621829.168578] block drbd15: helper command: /bin/true before-resync-target minor-15
May 23 20:13:56 z2-12 kernel: [2621830.490646] block drbd13: helper command: /bin/true after-resync-target minor-13 exit code 0 (0x0)
May 23 20:13:56 z2-12 kernel: [2621830.490694] block drbd13: md_sync_timer expired! Worker calls drbd_md_sync().
May 23 20:13:56 z2-12 kernel: [2621830.490942] block drbd15: helper command: /bin/true before-resync-target minor-15 exit code 0 (0x0)
May 23 20:13:56 z2-12 kernel: [2621830.490990] block drbd15: conn( WFSyncUUID -> SyncTarget ) disk( UpToDate -> Inconsistent )
May 23 20:13:56 z2-12 kernel: [2621830.491038] block drbd15: Began resync as SyncTarget (will sync 0 KB [0 bits set]).
May 23 20:13:57 z2-12 kernel: [2621831.041596] block drbd15: Resync done (total 1 sec; paused 0 sec; 0 K/sec)
May 23 20:13:57 z2-12 kernel: [2621831.041632] block drbd15: conn( SyncTarget -> Connected ) disk( Inconsistent -> UpToDate )
May 23 20:13:57 z2-12 kernel: [2621831.041680] block drbd15: helper command: /bin/true after-resync-target minor-15
May 23 20:13:57 z2-12 kernel: [2621831.184613] block drbd15: helper command: /bin/true after-resync-target minor-15 exit code 0 (0x0)
May 23 20:14:02 z2-12 kernel: [2621836.033522] block drbd15: md_sync_timer expired! Worker calls drbd_md_sync().
May 23 20:14:15 z2-12 kernel: [2621848.876830] emacs invoked oom-killer: gfp_mask=0x280da, order=0, oom_adj=-17