Hi All When we join a domain (With large number of user - ~25k) and subsequently leave the domain smbd crashes with the following backtrace in log.smbd BACKTRACE: 21 stack frames: #0 smbd(log_stack_trace+0x2d) [0x77cac5] #1 smbd(smb_panic+0x7c) [0x77cbf7] #2 smbd [0x76bd6c] #3 [0xf7c420] #4 /usr/lib/libkrb5.so.3(krb5int_locate_server+0x114) [0x217f14] #5 /usr/lib/libkrb5.so.3(krb5_locate_kdc+0x46) [0x2184e6] #6 /usr/lib/libkrb5.so.3(krb5_sendto_kdc+0xb0) [0x21a580] #7 /usr/lib/libkrb5.so.3 [0x1f8b82] #8 /usr/lib/libkrb5.so.3(krb5_get_init_creds+0x78d) [0x1f9c3d] #9 /usr/lib/libkrb5.so.3(krb5_get_init_creds_password+0x2bb) [0x1fbecb] #10 smbd(kerberos_kinit_password_ext+0x22b) [0xac5ccb] #11 smbd(ads_kinit_password+0x11f) [0xac5fae] #12 smbd [0xaba0b6] #13 smbd(ads_sasl_bind+0x185) [0xab83f5] #14 smbd(ads_connect+0xafd) [0xab69d9] #15 smbd(check_published_printers+0x116) [0x7b5118] #16 smbd(nt_printing_init+0xc1e) [0x7bc09b] #17 smbd(print_backend_init+0x186) [0x7aee91] #18 smbd(main+0xa62) [0xb0cf30] #19 /lib/libc.so.6(__libc_start_main+0xdc) [0xd2ce9c] #20 smbd [0x4b3b61] [2012/10/17 14:29:59.452640, 0] lib/fault.c:326(dump_core) Can anybody shed some light on this? We are using CentOS 5.8 and using authconfig to configure AD. As far as I can tell smb.conf and krb5.conf are configured properly. This is not frequent though. We have to join and leave the domain several times before we reproduce this problem. I have also seen cases that when we run kinit, the knint segfaults in the same system. But I have seen this only a few times. Any insights will be much appreciated. Thanks in advance Ridgetree