Samba smbd processes overload and panic

["Dante F. B. Colò"]

Greetings everyone

I recently deployed  Samba 4.0.21 running as classic pdc on freebsd 10 
version RELEASE-p9, most of shares are in a ZFS volume with vfs_zfsacl 
module, some smbd processes stays constantly with around 70% cpu usage 
sometimes 90% and dies with signal 11 according the log message , i also 
tried enable debug but didn't show anything helpful  or maybe i wasn't 
able to understand the entire log, is there anybody here experiencing 
something similar ?

Best Regards
Dante F. B. Colò

INTERNAL ERROR: Signal 11 in pid 59865 (4.0.21)
   Please read the Trouble-Shooting section of the Samba HOWTO
[2014/10/10 08:33:08.955295,  0] 
===============================================================
[2014/10/10 08:33:08.955326,  0]   PANIC (pid 59865): internal error
[2014/10/10 08:33:08.957939,  0]   BACKTRACE: 7 stack frames:
    #0 0x802b5a921 <log_stack_trace+0x21> at /usr/local/lib/libsmbconf.so.0
    #1 0x802b5a708 <smb_panic_s3+0x98> at /usr/local/lib/libsmbconf.so.0
    #2 0x80146ef25 <smb_panic+0x35> at /usr/local/lib/libsamba-util.so.0
    #3 0x80146f50a <smb_panic+0x61a> at /usr/local/lib/libsamba-util.so.0
    #4 0x80146eee3 <fault_setup+0x73> at /usr/local/lib/libsamba-util.so.0
    #5 0x8044ce40b <_swapcontext+0x15b> at /lib/libthr.so.3
    #6 0x8044cdff3 <sigaction+0x343> at /lib/libthr.so.3