[Samba] samba PDC + ldap: segfault in uid_to_sid/_nss_ldap_getpwuid_r

[Guenter Bartsch]

All,

on a fairly large (73 TB XFS) file server running CentOS 6.2, samba
3.5.10-116.el6_2 I see pretty frequently backtraces like this one:


May 11 15:54:19 vrfs001 smbd[11709]: [2012/05/11 15:54:19.793851,  0]
lib/fault.c:46(fault_report)
May 11 15:54:19 vrfs001 smbd[11709]:
===============================================================
May 11 15:54:19 vrfs001 smbd[11709]: [2012/05/11 15:54:19.793921,  0]
lib/fault.c:47(fault_report)
May 11 15:54:19 vrfs001 smbd[11709]:   INTERNAL ERROR: Signal 11 in
pid 11709 (3.5.10-116.el6_2.slrdbg2)
May 11 15:54:19 vrfs001 smbd[11709]:   Please read the
Trouble-Shooting section of the Samba3-HOWTO
May 11 15:54:19 vrfs001 smbd[11709]: [2012/05/11 15:54:19.793947,  0]
lib/fault.c:49(fault_report)
May 11 15:54:19 vrfs001 smbd[11709]:
May 11 15:54:19 vrfs001 smbd[11709]:   From:
http://www.samba.org/samba/docs/Samba3-HOWTO.pdf
May 11 15:54:19 vrfs001 smbd[11709]: [2012/05/11 15:54:19.793982,  0]
lib/fault.c:50(fault_report)
May 11 15:54:19 vrfs001 smbd[11709]:
===============================================================
May 11 15:54:19 vrfs001 smbd[11709]: [2012/05/11 15:54:19.794010,  0]
lib/util.c:1490(smb_panic)
May 11 15:54:19 vrfs001 smbd[11709]:   PANIC (pid 11709): internal error
May 11 15:54:19 vrfs001 smbd[11709]: [2012/05/11 15:54:19.826895,  0]
lib/util.c:1594(log_stack_trace)
May 11 15:54:19 vrfs001 smbd[11709]:   BACKTRACE: 29 stack frames:
May 11 15:54:19 vrfs001 smbd[11709]:    #0 smbd(log_stack_trace+0x1a)
[0x7fae111cc8aa]
May 11 15:54:19 vrfs001 smbd[11709]:    #1 smbd(smb_panic+0x1f) [0x7fae111cc96f]
May 11 15:54:19 vrfs001 smbd[11709]:    #2 smbd(+0x36b26d) [0x7fae111bc26d]
May 11 15:54:19 vrfs001 smbd[11709]:    #3 /lib64/libc.so.6(+0x32900)
[0x7fae0e030900]
May 11 15:54:19 vrfs001 smbd[11709]:    #4
/lib64/libnss_ldap.so.2(_nss_ldap_getpwuid_r+0x15d) [0x7fae03586a6d]
May 11 15:54:19 vrfs001 smbd[11709]:    #5
/lib64/libc.so.6(getpwuid_r+0xdd) [0x7fae0e0a84ed]
May 11 15:54:19 vrfs001 smbd[11709]:    #6
/lib64/libc.so.6(getpwuid+0x6f) [0x7fae0e0a7ddf]
May 11 15:54:19 vrfs001 smbd[11709]:    #7 smbd(+0x31bd5d) [0x7fae1116cd5d]
May 11 15:54:19 vrfs001 smbd[11709]:    #8 smbd(+0x32174f) [0x7fae1117274f]
May 11 15:54:19 vrfs001 smbd[11709]:    #9 smbd(uid_to_sid+0x10b)
[0x7fae1117291b]
May 11 15:54:19 vrfs001 smbd[11709]:    #10
smbd(create_file_sids+0x1f) [0x7fae10facd0f]
May 11 15:54:19 vrfs001 smbd[11709]:    #11 smbd(+0x164689) [0x7fae10fb5689]
May 11 15:54:19 vrfs001 smbd[11709]:    #12
smbd(posix_get_nt_acl+0x10b) [0x7fae10fb63fb]
May 11 15:54:19 vrfs001 smbd[11709]:    #13 smbd(+0x1872bd) [0x7fae10fd82bd]
May 11 15:54:19 vrfs001 smbd[11709]:    #14
smbd(smb_vfs_call_get_nt_acl+0x2d) [0x7fae10fa7b9d]
May 11 15:54:19 vrfs001 smbd[11709]:    #15
smbd(can_access_file_acl+0x6f) [0x7fae10fc7d1f]
May 11 15:54:19 vrfs001 smbd[11709]:    #16
smbd(reply_ntcreate_and_X+0xf25) [0x7fae10f69a65]
May 11 15:54:19 vrfs001 smbd[11709]:    #17 smbd(+0x1690f5) [0x7fae10fba0f5]
May 11 15:54:19 vrfs001 smbd[11709]:    #18 smbd(+0x169497) [0x7fae10fba497]
May 11 15:54:19 vrfs001 smbd[11709]:    #19 smbd(+0x1699f8) [0x7fae10fba9f8]
May 11 15:54:19 vrfs001 smbd[11709]:    #20 smbd(run_events+0x22b)
[0x7fae111dcbbb]
May 11 15:54:19 vrfs001 smbd[11709]:    #21 smbd(smbd_process+0x82b)
[0x7fae10fb966b]
May 11 15:54:19 vrfs001 smbd[11709]:    #22 smbd(+0x678fce) [0x7fae114c9fce]
May 11 15:54:19 vrfs001 smbd[11709]:    #23 smbd(run_events+0x22b)
[0x7fae111dcbbb]
May 11 15:54:19 vrfs001 smbd[11709]:    #24 smbd(+0x38bee1) [0x7fae111dcee1]
May 11 15:54:19 vrfs001 smbd[11709]:    #25
smbd(_tevent_loop_once+0x90) [0x7fae111dd2c0]
May 11 15:54:19 vrfs001 smbd[11709]:    #26 smbd(main+0xb7b) [0x7fae114cad2b]
May 11 15:54:19 vrfs001 smbd[11709]:    #27
/lib64/libc.so.6(__libc_start_main+0xfd) [0x7fae0e01ccdd]
May 11 15:54:19 vrfs001 smbd[11709]:    #28 smbd(+0xea849) [0x7fae10f3b849]
May 11 15:54:19 vrfs001 smbd[11709]: [2012/05/11 15:54:19.827188,  0]
lib/fault.c:326(dump_core)
May 11 15:54:19 vrfs001 smbd[11709]:   dumping core in /var/log/samba/cores/smbd

pwuid information is stored in OpenLDAP on this machine - could this be related?

anyone ever seen this - any clue how to debug this further?

thanks,

    guenter