I found many records error in /var/log/messages then server is reboot smbd[14516]: smbd[14516]: [2008/04/21 17:39:15, 0] lib/util.c:smb_panic2(1512) smbd[14516]: BACKTRACE: 15 stack frames: smbd[14516]: #0 smbd(smb_panic2+0x8a) [0xca6290] smbd[14516]: #1 smbd(smb_panic+0x19) [0xca64bc] smbd[14516]: #2 smbd [0xcab61c] smbd[14516]: #3 smbd [0xb80fe2] smbd[14516]: #4 smbd(set_sec_ctx+0xf2) [0xb818b7] smbd[14516]: #5 smbd(change_to_user+0x646) [0xb78792] smbd[14516]: #6 smbd [0xb916f4] smbd[14516]: #7 smbd(make_connection+0x287) [0xb92c59] smbd[14516]: #8 smbd(reply_tcon_and_X+0x1d3) [0xb58c56] smbd[14516]: #9 smbd [0xb8f4f2] smbd[14516]: #10 smbd(process_smb+0x19b) [0xb8f92c] smbd[14516]: #11 smbd(smbd_process+0x15f) [0xb90654] smbd[14516]: #12 smbd(main+0x875) [0xd22c37] smbd[14516]: #13 /lib/tls/libc.so.6(__libc_start_main+0xd3) [0x2d3de3] smbd[14516]: #14 smbd [0xb2f281] smbd[14516]: smbd[14508]: [2008/04/21 17:39:16, 0] lib/util_sec.c:assert_uid(95) smbd[14508]: Failed to set uid privileges to (-1,40597) now set to (0,0) smbd[14508]: [2008/04/21 17:39:16, 0] lib/util.c:smb_panic2(1504) smbd[14508]: PANIC: failed to set uid