[Samba] high cpu load with 3.0.20b (not using ldap)

Sebastian Held sebastian.held at gmx.de
Thu Oct 20 14:11:09 GMT 2005


I've a problem, with a cpu load (>66% while running a separate virusscanner
with another 30%) of one of my smbd processes. It only happens occasionally
(approx. 2 times in the last 4 weeks). The backtrace is attached.
It seems to me, that smbd is looking for colorlaser5quota. This printer isn't
attached anymore to the server and neither cups nor samba configuration
files include a section for this printer.
Is this error due to a bug in libc.so.6 not returning from __nis_hash() ?
Or because this machine is a NIS-server?

What to do next, to debug this further?

passwd: compat
group:  compat
hosts:  files lwres dns
networks:       files dns
services:       files
protocols:      files
rpc:    files
ethers: files
netmasks:       files
netgroup:       files
publickey:      files
bootparams:     files
automount:      files nis
aliases:        files

(gdb) bt
#0  0x403172a2 in __nis_hash () from /lib/tls/libc.so.6
#1  0x403187e6 in __nscd_cache_search () from /lib/tls/libc.so.6
#2  0x40317374 in nscd_getpw_r () from /lib/tls/libc.so.6
#3  0x40317662 in __nscd_getpwnam_r () from /lib/tls/libc.so.6
#4  0x402b92bd in getpwnam_r@@GLIBC_2.1.2 () from /lib/tls/libc.so.6
#5  0x402b8c81 in getpwnam () from /lib/tls/libc.so.6
#6  0x081f038c in sys_getpwnam (name=0x798716af "") at system.c:883
#7  0x081f4658 in getpwnam_alloc (name=0xbfffe500 "COLORLASER5QUOTA") at 
#8  0x081f2aa7 in Get_Pwnam_internals (user=0xbfffec6f "colorlaser5quota", 
user2=0xbfffe500 "COLORLASER5QUOTA") at username.c:279
#9  0x081f2c96 in Get_Pwnam_alloc (user=0xbfffec6f "colorlaser5quota") at 
#10 0x081f2cb1 in Get_Pwnam (user=0x798716af "") at username.c:329
#11 0x081f21a5 in get_user_home_dir (user=0x798716af "") at username.c:76
#12 0x080eb681 in find_service (service=0xbfffec6f "colorlaser5quota") at 
#13 0x08149801 in set_printer_hnd_name (Printer=0x83e4ad0, 
handlename=0xbfffec60 "\\\\") at srv_spoolss_nt.c:539
#14 0x08149cf8 in open_printer_hnd (p=0x83d7f80, hnd=0xbfffeda0, 
name=0xbfffec60 "\\\\", access_granted=0) at srv_spoolss_nt.c:637
#15 0x0814bce4 in _spoolss_open_printer_ex (p=0x83d7f80, q_u=0xbfffedc0, 
r_u=0xbfffeda0) at srv_spoolss_nt.c:1619
#16 0x081445f0 in api_spoolss_open_printer_ex (p=0x83d7f80) at 
#17 0x08176802 in api_rpcTNP (p=0x83d7f80, rpc_name=0x83d7f8e "spoolss", 
api_rpc_cmds=0x8346d80, n_cmds=51) at srv_pipe.c:1571
#18 0x08176541 in api_pipe_request (p=0x83d7f80) at srv_pipe.c:1517
#19 0x0817137f in process_request_pdu (p=0x83d7f80, rpc_in_p=0xbfffeff0) at 
#20 0x0817159e in process_complete_pdu (p=0x83d7f80) at srv_pipe_hnd.c:740
#21 0x08171856 in process_incoming_data (p=0x83d7f80, data=0x836a120 "", 
n=196) at srv_pipe_hnd.c:838
#22 0x08171a63 in write_to_internal_pipe (np_conn=0x83d7f80, data=0x836a120 
"", n=212) at srv_pipe_hnd.c:877
#23 0x081719d2 in write_to_pipe (p=0x83cade0, data=0x836a110 "\005", n=212) at 
#24 0x0809a4fa in api_fd_reply (conn=0x83e4320, vuid=101, outbuf=0x405aa008 
"", setup=0x83d2620, data=0x798716af "", params=0x0, suwcnt=2,
    tdscnt=2038896303, tpscnt=0, mdrcnt=1024, mprcnt=0) at ipc.c:304
#25 0x0809a7a5 in named_pipe (conn=0x83e4320, vuid=101, outbuf=0x405aa008 "", 
name=0xbffff2e6 "", setup=0x83d2620, data=0x836a110 "\005", params=0x0,
    suwcnt=2, tdscnt=212, tpscnt=0, msrcnt=0, mdrcnt=1024, mprcnt=0) at 
#26 0x0809b3dc in reply_trans (conn=0x83e4320, inbuf=0x40565008 "", 
outbuf=0x405aa008 "", size=300, bufsize=131072) at ipc.c:561
#27 0x080ea26a in switch_message (type=37, inbuf=0x40565008 "", 
outbuf=0x405aa008 "", size=300, bufsize=2038896303) at process.c:991
#28 0x080ea31a in construct_reply (inbuf=0x40565008 "", outbuf=0x405aa008 "", 
size=2038896303, bufsize=2038896303) at process.c:1021
#29 0x080ea66f in process_smb (inbuf=0x40565008 "", outbuf=0x405aa008 "") at 
#30 0x080eb368 in smbd_process () at process.c:1670
#31 0x0827e40b in main (argc=2038896303, argv=0xbffff6c4) at server.c:975

br, S. Held

More information about the samba mailing list