[Pkg-samba-maint] Bug#821939: samba: unable to connect to guest shares after upgrade to latest (2:4.2.10+dfsg-0+deb8u2) samba package

[sputnik]

I forgot to add some logs, so here they are (log level 3):

[2016/04/21 13:36:05.297966,  3] 
../auth/gensec/gensec_start.c:899(gensec_register)
   GENSEC backend 'gssapi_spnego' registered
[2016/04/21 13:36:05.298000,  3] 
../auth/gensec/gensec_start.c:899(gensec_register)
   GENSEC backend 'gssapi_krb5' registered
[2016/04/21 13:36:05.298016,  3] 
../auth/gensec/gensec_start.c:899(gensec_register)
   GENSEC backend 'gssapi_krb5_sasl' registered
[2016/04/21 13:36:05.298031,  3] 
../auth/gensec/gensec_start.c:899(gensec_register)
   GENSEC backend 'spnego' registered
[2016/04/21 13:36:05.298047,  3] 
../auth/gensec/gensec_start.c:899(gensec_register)
   GENSEC backend 'schannel' registered
[2016/04/21 13:36:05.298072,  3] 
../auth/gensec/gensec_start.c:899(gensec_register)
   GENSEC backend 'naclrpc_as_system' registered
[2016/04/21 13:36:05.298086,  3] 
../auth/gensec/gensec_start.c:899(gensec_register)
   GENSEC backend 'sasl-EXTERNAL' registered
[2016/04/21 13:36:05.298100,  3] 
../auth/gensec/gensec_start.c:899(gensec_register)
   GENSEC backend 'ntlmssp' registered
[2016/04/21 13:36:05.298113,  3] 
../auth/gensec/gensec_start.c:899(gensec_register)
   GENSEC backend 'ntlmssp_resume_ccache' registered
[2016/04/21 13:36:05.298127,  3] 
../auth/gensec/gensec_start.c:899(gensec_register)
   GENSEC backend 'http_basic' registered
[2016/04/21 13:36:05.298140,  3] 
../auth/gensec/gensec_start.c:899(gensec_register)
   GENSEC backend 'http_ntlm' registered
[2016/04/21 13:36:05.298155,  3] 
../auth/gensec/gensec_start.c:899(gensec_register)
   GENSEC backend 'krb5' registered
[2016/04/21 13:36:05.298168,  3] 
../auth/gensec/gensec_start.c:899(gensec_register)
   GENSEC backend 'fake_gssapi_krb5' registered
[2016/04/21 13:36:07.887681,  3] 
../auth/ntlmssp/ntlmssp_util.c:69(debug_ntlmssp_flags)
   Got NTLMSSP neg_flags=0x62880205
[2016/04/21 13:36:07.890906,  3] 
../auth/ntlmssp/ntlmssp_server.c:449(ntlmssp_server_preauth)
   Got user=[GUEST] domain=[] workstation=[workstation] len1=24 len2=210
[2016/04/21 13:36:07.890978,  3] 
../source3/param/loadparm.c:3636(lp_load_ex)
   lp_load_ex: refreshing parameters
[2016/04/21 13:36:07.891067,  3] 
../source3/param/loadparm.c:527(init_globals)
   Initialising global parameters
[2016/04/21 13:36:07.891178,  3] 
../source3/param/loadparm.c:2579(lp_do_section)
   Processing section "[global]"
[2016/04/21 13:36:07.891263,  2] 
../source3/param/loadparm.c:2596(lp_do_section)
   Processing section "[pub]"
[2016/04/21 13:36:07.891345,  2] 
../source3/param/loadparm.c:2596(lp_do_section)
   Processing section "[FTP]"
[2016/04/21 13:36:07.891412,  2] 
../source3/param/loadparm.c:2596(lp_do_section)
   Processing section "[bibt]"
[2016/04/21 13:36:07.891489,  3] 
../source3/param/loadparm.c:1476(lp_add_ipc)
   adding IPC service
[2016/04/21 13:36:07.891536,  3] 
../source3/auth/auth.c:178(auth_check_ntlm_password)
   check_ntlm_password:  Checking password for unmapped user 
[]\[GUEST]@[workstation] with the new password interface
[2016/04/21 13:36:07.891552,  3] 
../source3/auth/auth.c:181(auth_check_ntlm_password)
   check_ntlm_password:  mapped user is: 
[my_netbios_name]\[GUEST]@[workstation]
[2016/04/21 13:36:07.891609,  3] 
../source3/auth/check_samsec.c:400(check_sam_security)
   check_sam_security: Couldn't find user 'GUEST' in passdb.
[2016/04/21 13:36:07.891630,  2] 
../source3/auth/auth.c:315(auth_check_ntlm_password)
   check_ntlm_password:  Authentication for user [GUEST] -> [GUEST] 
FAILED with error NT_STATUS_NO_SUCH_USER
[2016/04/21 13:36:07.891660,  3] 
../source3/auth/auth_util.c:1599(do_map_to_guest_server_info)
   No such user GUEST [] - using guest account
[2016/04/21 13:36:07.891699,  1] 
../auth/ntlmssp/ntlmssp_server.c:908(ntlmssp_server_postauth)
   ntlmssp_server_postauth: invalid NTLMSSP_MIC for user=[GUEST] 
domain=[] workstation=[workstation]
[2016/04/21 13:36:07.891713,  1] ../lib/util/util.c:559(dump_data)
   [0000] 02 5E 1B A6 09 58 D1 FE   D7 CB 64 F7 66 21 84 5F   .^...X.. 
..d.f!._
[2016/04/21 13:36:07.891742,  1] ../lib/util/util.c:559(dump_data)
   [0000] 55 A4 2E CE 72 9A 00 55   E3 F2 9C 40 FA 95 46 7C   U...r..U 
... at ..F|
[2016/04/21 13:36:07.891771,  2] 
../auth/gensec/spnego.c:708(gensec_spnego_server_negTokenTarg)
   SPNEGO login failed: NT_STATUS_INVALID_PARAMETER