I'm running samba and winbind on a Fedora 10 box.

# uname -a
Linux maggie.toyon.corp 2.6.27.9-159.fc10.x86_64 #1 SMP Tue Dec 16 14:47:52 EST 2008 x86_64 x86_64 x86_64 GNU/Linux

I upgraded to 3.2.7 on 1/7/2009.  I have experienced 4 core dumps since the upgrade.  Here is the message log output of the last dump:

Jan 17 23:36:44 maggie winbindd[23258]: [2009/01/17 23:36:44,  0] lib/fault.c:fault_report(40)
Jan 17 23:36:44 maggie winbindd[23258]:   ===============================================================
Jan 17 23:36:44 maggie winbindd[23258]: [2009/01/17 23:36:44,  0] lib/fault.c:fault_report(41)
Jan 17 23:36:44 maggie winbindd[23258]:   INTERNAL ERROR: Signal 6 in pid 23258 (3.2.7-0.25.fc10)
Jan 17 23:36:44 maggie winbindd[23258]:   Please read the Trouble-Shooting section of the Samba3-HOWTO
Jan 17 23:36:44 maggie winbindd[23258]: [2009/01/17 23:36:44,  0] lib/fault.c:fault_report(43)
Jan 17 23:36:44 maggie winbindd[23258]:
Jan 17 23:36:44 maggie winbindd[23258]:   From: http://www.samba.org/samba/docs/Samba3-HOWTO.pdf
Jan 17 23:36:44 maggie winbindd[23258]: [2009/01/17 23:36:44,  0] lib/fault.c:fault_report(44)
Jan 17 23:36:44 maggie winbindd[23258]:   ===============================================================
Jan 17 23:36:44 maggie winbindd[23258]: [2009/01/17 23:36:44,  0] lib/util.c:smb_panic(1663)
Jan 17 23:36:44 maggie winbindd[23258]:   PANIC (pid 23258): internal error
Jan 17 23:36:44 maggie winbindd[23258]: [2009/01/17 23:36:44,  0] lib/util.c:log_stack_trace(1767)
Jan 17 23:36:44 maggie winbindd[23258]:   BACKTRACE: 24 stack frames:
Jan 17 23:36:44 maggie winbindd[23258]:    #0 winbindd(log_stack_trace+0x1a) [0x7fe8a0f856ba]
Jan 17 23:36:44 maggie winbindd[23258]:    #1 winbindd(smb_panic+0x1f) [0x7fe8a0f8578f]
Jan 17 23:36:44 maggie winbindd[23258]:    #2 winbindd [0x7fe8a0f70620]
Jan 17 23:36:44 maggie winbindd[23258]:    #3 /lib64/libc.so.6 [0x1d11f90]
Jan 17 23:36:44 maggie winbindd[23258]:    #4 /lib64/libc.so.6(gsignal+0x35) [0x1d11f05]
Jan 17 23:36:44 maggie winbindd[23258]:    #5 /lib64/libc.so.6(abort+0x183) [0x1d13a73]
Jan 17 23:36:44 maggie winbindd[23258]:    #6 /lib64/libc.so.6(__assert_fail+0xe9) [0x1d0aef9]
Jan 17 23:36:44 maggie winbindd[23258]:    #7 /usr/lib64/libldap-2.4.so.2 [0x148be7d]
Jan 17 23:36:44 maggie winbindd[23258]:    #8 winbindd [0x7fe8a1186465]
Jan 17 23:36:44 maggie winbindd[23258]:    #9 winbindd(ads_do_search_all_args+0x83) [0x7fe8a11868d3]
Jan 17 23:36:44 maggie winbindd[23258]:    #10 winbindd [0x7fe8a1192320]
Jan 17 23:36:44 maggie winbindd[23258]:    #11 winbindd(ads_do_search_retry+0x10) [0x7fe8a1192d30]
Jan 17 23:36:44 maggie winbindd[23258]:    #12 winbindd(ads_USN+0x40) [0x7fe8a1183520]
Jan 17 23:36:44 maggie winbindd[23258]:    #13 winbindd [0x7fe8a0efefd8]
Jan 17 23:36:44 maggie winbindd[23258]:    #14 winbindd [0x7fe8a0ee5543]
Jan 17 23:36:44 maggie winbindd[23258]:    #15 winbindd [0x7fe8a0ee574a]
Jan 17 23:36:44 maggie winbindd[23258]:    #16 winbindd [0x7fe8a0ee5c61]
Jan 17 23:36:44 maggie winbindd[23258]:    #17 winbindd(winbindd_dual_list_trusted_domains+0x5e) [0x7fe8a0ef3d7e]
Jan 17 23:36:44 maggie winbindd[23258]:    #18 winbindd [0x7fe8a0f06474]
Jan 17 23:36:44 maggie winbindd[23258]:    #19 winbindd [0x7fe8a0f06aae]
Jan 17 23:36:44 maggie winbindd[23258]:    #20 winbindd(rescan_trusted_domains+0x43) [0x7fe8a0edf8b3]
Jan 17 23:36:44 maggie winbindd[23258]:    #21 winbindd(main+0x728) [0x7fe8a0ed52f8]
Jan 17 23:36:44 maggie winbindd[23258]:    #22 /lib64/libc.so.6(__libc_start_main+0xe6) [0x1cfd576]
Jan 17 23:36:44 maggie winbindd[23258]:    #23 winbindd [0x7fe8a0ed37e9]
Jan 17 23:36:44 maggie winbindd[23258]: [2009/01/17 23:36:44,  0] lib/fault.c:dump_core(201)
Jan 17 23:36:44 maggie winbindd[23258]:   dumping core in /var/log/samba/cores/winbindd
Jan 17 23:36:44 maggie winbindd[23258]: