samba - Jun 2015 - smb2_validate_message_id: client used more credits than granted

?
Hi,
sometimes this error appears in our log files. Ist this a bug?

Jun 11 12:38:00 barbarella smbd[7036]: [2015/06/11 12:38:00.286985,  0]
./source3/smbd/smb2_server.c:668(smb2_validate_message_id)
Jun 11 12:38:00 barbarella smbd[7036]:   smb2_validate_message_id: client used
more credits than granted, mid 4, charge 1, credits_granted 0, seqnum low/range:
4/0
Jun 11 12:38:01 barbarella smbd[5755]: [2015/06/11 12:38:01.959946,  0]
./lib/util/fault.c:72(fault_report)
Jun 11 12:38:01 barbarella smbd[5755]:  
==============================================================Jun 11 12:38:01
barbarella smbd[5755]: [2015/06/11 12:38:01.960015,  0]
./lib/util/fault.c:73(fault_report)
Jun 11 12:38:01 barbarella smbd[5755]:   INTERNAL ERROR: Signal 11 in pid 5755
(4.1.17-SerNet-RedHat-11.el6)
Jun 11 12:38:01 barbarella smbd[5755]:   Please read the Trouble-Shooting
section of the Samba HOWTO
Jun 11 12:38:01 barbarella smbd[5755]: [2015/06/11 12:38:01.960081,  0]
../lib/util/fault.c:75(fault_report)
Jun 11 12:38:01 barbarella smbd[5755]:  
==============================================================Jun 11 12:38:01
barbarella smbd[5755]: [2015/06/11 12:38:01.960131,  0]
./source3/lib/util.c:785(smb_panic_s3)
Jun 11 12:38:01 barbarella smbd[5755]:   PANIC (pid 5755): internal error
Jun 11 12:38:01 barbarella smbd[5755]: [2015/06/11 12:38:01.962446,  0]
./source3/lib/util.c:896(log_stack_trace)
Jun 11 12:38:01 barbarella smbd[5755]:   BACKTRACE: 23 stack frames:
Jun 11 12:38:01 barbarella smbd[5755]:    #0
/usr/lib64/samba/libsmbconf.so.0(log_stack_trace+0x1c) [0x7f08241389b7]
Jun 11 12:38:01 barbarella smbd[5755]:    #1
/usr/lib64/samba/libsmbconf.so.0(smb_panic_s3+0x55) [0x7f0824138ab9]
Jun 11 12:38:01 barbarella smbd[5755]:    #2
/usr/lib64/samba/libsamba-util.so.0(smb_panic+0x2d) [0x7f0825c80bae]
Jun 11 12:38:01 barbarella smbd[5755]:    #3
/usr/lib64/samba/libsamba-util.so.0(+0x17ec7) [0x7f0825c80ec7]
Jun 11 12:38:01 barbarella smbd[5755]:    #4 /lib64/libpthread.so.0(+0xf710)
[0x7f0825eab710]
Jun 11 12:38:01 barbarella smbd[5755]:    #5
/usr/lib64/samba/libsmbd_base.so(smbd_smb2_request_done_ex+0x66d)
[0x7f08258999da]
Jun 11 12:38:01 barbarella smbd[5755]:    #6
/usr/lib64/samba/libsmbd_base.so(smbd_smb2_request_error_ex+0x203)
[0x7f0825899dd5]
Jun 11 12:38:01 barbarella smbd[5755]:    #7
/usr/lib64/samba/libsmbd_base.so(+0x13cb76) [0x7f08258acb76]
Jun 11 12:38:01 barbarella smbd[5755]:    #8
/usr/lib64/samba/libtevent.so.0(_tevent_req_notify_callback+0x2a)
[0x7f0825568727]
Jun 11 12:38:01 barbarella smbd[5755]:    #9
/usr/lib64/samba/libtevent.so.0(+0x4738) [0x7f0825568738]
Jun 11 12:38:01 barbarella smbd[5755]:    #10
/usr/lib64/samba/libtevent.so.0(+0x47b1) [0x7f08255687b1]
Jun 11 12:38:01 barbarella smbd[5755]:    #11
/usr/lib64/samba/libtevent.so.0(tevent_common_loop_immediate+0x128)
[0x7f0825567f48]
Jun 11 12:38:01 barbarella smbd[5755]:    #12
/usr/lib64/samba/libsmbconf.so.0(run_events_poll+0x3c) [0x7f082415558f]
Jun 11 12:38:01 barbarella smbd[5755]:    #13
/usr/lib64/samba/libsmbconf.so.0(+0x42b93) [0x7f0824155b93]
Jun 11 12:38:01 barbarella smbd[5755]:    #14
/usr/lib64/samba/libtevent.so.0(_tevent_loop_once+0x92) [0x7f0825567407]
Jun 11 12:38:01 barbarella smbd[5755]:    #15
/usr/lib64/samba/libsmbd_base.so(smbd_process+0xf76) [0x7f0825886378]
Jun 11 12:38:01 barbarella smbd[5755]:    #16 /usr/sbin/smbd(+0x8860)
[0x7f08262e3860]
Jun 11 12:38:01 barbarella smbd[5755]:    #17
/usr/lib64/samba/libsmbconf.so.0(run_events_poll+0x2c2) [0x7f0824155815]
Jun 11 12:38:01 barbarella smbd[5755]:    #18
/usr/lib64/samba/libsmbconf.so.0(+0x42c5d) [0x7f0824155c5d]
Jun 11 12:38:01 barbarella smbd[5755]:    #19
/usr/lib64/samba/libtevent.so.0(_tevent_loop_once+0x92) [0x7f0825567407]
Jun 11 12:38:01 barbarella smbd[5755]:    #20 /usr/sbin/smbd(main+0x17c9)
[0x7f08262e52ee]
Jun 11 12:38:01 barbarella smbd[5755]:    #21
/lib64/libc.so.6(__libc_start_main+0xfd) [0x7f0822bd5d5d]
Jun 11 12:38:01 barbarella smbd[5755]:    #22 /usr/sbin/smbd(+0x58b9)
[0x7f08262e08b9]
Jun 11 12:38:01 barbarella smbd[5755]: [2015/06/11 12:38:01.962841,  0]
./source3/lib/dumpcore.c:317(dump_core)
Jun 11 12:38:01 barbarella smbd[5755]:   dumping core in
/var/log/samba/cores/smbd
Jun 11 12:38:01 barbarella smbd[5755]:

Kind regards,
Martin