[Pkg-samba-maint] Bug#858590: segmantation fault after upgrade to 2:4.2.14+dfsg-0+deb8u4

[rolnas at gmail.com]

Package: samba
Version: 2:4.2.14+dfsg-0+deb8u4

After upgrade to this version samba file service don't work.

$ smbclient //server/user -U DOMAIN\\user
Enter DOMAIN\user's password:
Domain=[DOMAIN] OS=[Windows 6.1] Server=[Samba 4.2.14-Debian]
smb: \> dir
NT_STATUS_CONNECTION_DISCONNECTED listing \*
smb: \> SMBecho failed (NT_STATUS_CONNECTION_DISCONNECTED). The 
connection is disconnected now

Samba share definition:
[homes]
         comment =
         invalid users = root toor
         read only = no
         browseable = no
;       profile acls = yes
         csc policy = disable
         strict allocate = yes
         hide files = /desktop.ini/$RECYCLE.BIN/
         hide dot files = no
         dos filetime resolution = yes
         dos filetimes = yes
         fake directory create times = yes
         delete readonly = yes
         acl allow execute always = yes
# show previous versions in file explorer
         vfs objects = shadow_copy2
         shadow:snapdir = .zfs/snapshot
         shadow:format = %Y%m%d
         shadow:sort = desc
         shadow:localtime = yes
         shadow:snapdirseverywhere = yes

Other shares work, so possible shadow_copy2 degradation after last 
security fixes.

Server process log.client has message:

[2017/03/24 08:58:42.754939,  2]   check_ntlm_password:  authentication 
for user [user] -> [user] -> [user] succeeded
[2017/03/24 08:58:43.913279,  0] 
===============================================================
[2017/03/24 08:58:43.913367,  0]   INTERNAL ERROR: Signal 11 in pid 2239 
(4.2.14-Debian)
   Please read the Trouble-Shooting section of the Samba HOWTO
[2017/03/24 08:58:43.913409,  0] 
===============================================================
[2017/03/24 08:58:43.913439,  0]   PANIC (pid 2239): internal error
[2017/03/24 08:58:43.914471,  0]   BACKTRACE: 30 stack frames:
    #0 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(log_stack_trace+0x1a) 
[0x7f3c82263f8a]
    #1 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(smb_panic_s3+0x20) 
[0x7f3c82264070]
    #2 /usr/lib/x86_64-linux-gnu/libsamba-util.so.0(smb_panic+0x2f) 
[0x7f3c83f1ee5f]
    #3 /usr/lib/x86_64-linux-gnu/libsamba-util.so.0(+0x2407f) 
[0x7f3c83f1f07f]
    #4 /lib/x86_64-linux-gnu/libpthread.so.0(+0xf890) [0x7f3c84140890]
    #5 /usr/lib/x86_64-linux-gnu/samba/vfs/shadow_copy2.so(+0x369b) 
[0x7f3c729f369b]
    #6 /usr/lib/x86_64-linux-gnu/samba/vfs/shadow_copy2.so(+0x5c64) 
[0x7f3c729f5c64]
    #7 
/usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(check_reduced_name+0xdd) 
[0x7f3c83adf13d]
    #8 
/usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(check_name+0x6b) 
[0x7f3c83aca9cb]
    #9 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0xb9db3) 
[0x7f3c83a80db3]
    #10 
/usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(dptr_create+0x70c) 
[0x7f3c83a8255c]
    #11 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0xf202f) 
[0x7f3c83ab902f]
    #12 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0xfc114) 
[0x7f3c83ac3114]
    #13 
/usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(reply_trans2+0x70c) 
[0x7f3c83ac60ec]
    #14 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x126753) 
[0x7f3c83aed753]
    #15 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x1284f2) 
[0x7f3c83aef4f2]
    #16 /usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(+0x129c2d) 
[0x7f3c83af0c2d]
    #17 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x171) 
[0x7f3c822843a1]
    #18 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x4a617) [0x7f3c82284617]
    #19 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x8d) 
[0x7f3c80c8543d]
    #20 
/usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) 
[0x7f3c80c855db]
    #21 
/usr/lib/x86_64-linux-gnu/samba/libsmbd-base.so.0(smbd_process+0x718) 
[0x7f3c83af1f88]
    #22 /usr/sbin/smbd(+0xadd0) [0x7f3c8457bdd0]
    #23 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(run_events_poll+0x171) 
[0x7f3c822843a1]
    #24 /usr/lib/x86_64-linux-gnu/libsmbconf.so.0(+0x4a617) [0x7f3c82284617]
    #25 /usr/lib/x86_64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x8d) 
[0x7f3c80c8543d]
    #26 
/usr/lib/x86_64-linux-gnu/libtevent.so.0(tevent_common_loop_wait+0x1b) 
[0x7f3c80c855db]
    #27 /usr/sbin/smbd(main+0x17e5) [0x7f3c845785e5]
    #28 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5) 
[0x7f3c808f7b45]
    #29 /usr/sbin/smbd(+0x76e4) [0x7f3c845786e4]
[2017/03/24 08:58:43.919678,  0]   dumping core in /var/log/samba/cores/smbd