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In an overload situation, the winbind helper child process inherits all those
hundreds of fd's which it will never talk to. Close them.
We (Christian Ambach and me) just saw a crash in libkrb5. Christian's analysis
showed that libkrb5 also does select, probably exceeding FD_SETSIZE and
crashing due to that reason. The parent winbind in theory does not do Kerberos
at all, so this should fix that problem.
The crash is interesting because the child process did not really crash.
Somewhere in glibc backtrace() is called, probably due to an assert() or some
explicit consistency check. This then somehow generates a signal probably due
to corrupted memory structures. That signal triggers Samba to again call
backtrace(). This blocks hard on a ptrace_once(). Sorry for the long backtrace
here, but this *is* interesting.
The child process blocking and not really crashing makes the situation worse:
The parent process does not get told the child has crashed and more client
sockets pile up.
This patch is intended to put some relief on this problem by closing the
majority of sockets the parent holds.
(gdb) bt
\#0 0x00002ad686a2b07b in pthread_once () from /lib64/libpthread.so.0
\#1 0x00002ad6867adf87 in backtrace () from /lib64/libc.so.6
\#2 0x00002ad683eab27c in log_stack_trace () at lib/util.c:1580
\#3 0x00002ad683eab34b in smb_panic (why=0x2ad6841c6ec3 "internal error") at lib/util.c:1481
\#4 0x00002ad683e9af3e in fault_report (sig=1) at lib/fault.c:52
\#5 sig_fault (sig=1) at lib/fault.c:75 #6 <signal handler called>
\#7 0x00002ad68673b005 in _int_malloc () from /lib64/libc.so.6
\#8 0x00002ad68673c95d in calloc () from /lib64/libc.so.6
\#9 0x00002ad684503e25 in _dl_new_object () from /lib64/ld-linux-x86-64.so.2
\#10 0x00002ad6844ffadc in _dl_map_object_from_fd () from /lib64/ld-linux-x86-64.so.2
\#11 0x00002ad684501d43 in _dl_map_object () from /lib64/ld-linux-x86-64.so.2
\#12 0x00002ad68450ac8d in dl_open_worker () from /lib64/ld-linux-x86-64.so.2
\#13 0x00002ad684506ed6 in _dl_catch_error () from /lib64/ld-linux-x86-64.so.2
\#14 0x00002ad68450a68c in _dl_open () from /lib64/ld-linux-x86-64.so.2
\#15 0x00002ad6867d0ba0 in do_dlopen () from /lib64/libc.so.6
\#16 0x00002ad684506ed6 in _dl_catch_error () from /lib64/ld-linux-x86-64.so.2
\#17 0x00002ad6867d0d07 in __libc_dlopen_mode () from /lib64/libc.so.6
\#18 0x00002ad6867adeea in init () from /lib64/libc.so.6
\#19 0x00002ad686a2b083 in pthread_once () from /lib64/libpthread.so.0
\#20 0x00002ad6867adf87 in backtrace () from /lib64/libc.so.6
\#21 0x00002ad68673285f in __libc_message () from /lib64/libc.so.6
\#22 0x00002ad68673a30f in _int_free () from /lib64/libc.so.6
\#23 0x00002ad68673a76b in free () from /lib64/libc.so.6
\#24 0x00002ad6853fe346 in krb5int_sendto () from /usr/lib64/libkrb5.so.3
\#25 0x00002ad6853fe511 in krb5_sendto_kdc () from /usr/lib64/libkrb5.so.3
\#26 0x00002ad6853df7c4 in ?? () from /usr/lib64/libkrb5.so.3
\#27 0x00002ad6853e0919 in krb5_get_init_creds () from /usr/lib64/libkrb5.so.3
\#28 0x00002ad6853e2a94 in krb5_get_init_creds_password () from /usr/lib64/libkrb5.so.3
\#29 0x00002ad684169ff1 in kerberos_kinit_password_ext (principal=0x2ad684702180 "<sanitized>", password=0x2ad6844c5bb0 "<sanitized>", time_offset=0, expire_time=0x2ad6846bf380, renew_till_time=0x0, cache_name=0x2ad6843cb3e0 "MEMORY:winbind_ccache", request_pac=false, add_netbios_addr=false, renewable_time=<value optimized out>, ntstatus=0x0) at libads/kerberos.c:223
\#30 0x00002ad68416a223 in ads_kinit_password (ads=0x2ad6846bf330) at libads/kerberos.c:327
\#31 0x00002ad68415f725 in ads_sasl_spnego_bind (ads=0x2ad6846bf330) at libads/sasl.c:812
\#32 0x00002ad68415dbc1 in ads_sasl_bind (ads=0x2ad6846bf330) at libads/sasl.c:1114
\#33 0x00002ad68415c09b in ads_connect (ads=0x2ad6846bf330) at libads/ldap.c:711
\#34 0x00002ad683e1b8f7 in ads_cached_connection (domain=0x2ad6846b07c0) at winbindd/winbindd_ads.c:124
\#35 0x00002ad683e1bc85 in sequence_number (domain=0x2ad6846b07c0, seq=0x2ad6846b0cd8) at winbindd/winbindd_ads.c:1233
\#36 0x00002ad683dffdd7 in refresh_sequence_number (domain=0x2ad6846b07c0, force=128) at winbindd/winbindd_cache.c:510
\#37 0x00002ad683e00520 in wcache_fetch (cache=<value optimized out>, domain=0x2ad6846b07c0, format=0x2ad68419901e "U/%s") at winbindd/winbindd_cache.c:638
\#38 0x00002ad683e04ac8 in query_user (domain=0x2ad6846b07c0, mem_ctx=0x2ad6846bc920, user_sid=0x7fff1d0cb8c0, info=0x7fff1d0cb810) at winbindd/winbindd_cache.c:1910
\#39 0x00002ad683df2d38 in winbindd_dual_userinfo (domain=0x2ad6846b07c0, state=0x7fff1d0cc9c0) at winbindd/winbindd_user.c:173
\#40 0x00002ad683e232e0 in fork_domain_child (child=0x2ad6846c2440) at winbindd/winbindd_dual.c:485
\#41 schedule_async_request (child=0x2ad6846c2440) at winbindd/winbindd_dual.c:319
\#42 0x00002ad683e229f2 in async_request_fail (state=0x2ad6846c1d00) at winbindd/winbindd_dual.c:214
\#43 0x00002ad683ebabec in run_events (ev=0x2ad6846aebf0, selrtn=0, read_fds=0x7fff1d0ce910, write_fds=<value optimized out>) at lib/events.c:123
\#44 0x00002ad683df08cb in process_loop (argc=<value optimized out>, argv=<value optimized out>, envp=<value optimized out>) at winbindd/winbindd.c:1113
\#45 main (argc=<value optimized out>, argv=<value optimized out>, envp=<value optimized out>) at winbindd/winbindd.c:1437
Autobuild-User: Volker Lendecke <vlendec@samba.org>
Autobuild-Date: Thu Apr 28 12:06:12 CEST 2011 on sn-devel-104
The previous code was too subtle, and tried to filter via two xfail
scripts. The --fail-immediately for the source3 knownfail would then
fail samba4 know failures.
Andrew Bartlett
Pair-Programmed-With: Andrew Tridgell <tridge@samba.org>
These tests can't run on systems without posix ACLs.
Autobuild-User: Andrew Bartlett <abartlet@samba.org>
Autobuild-Date: Thu Apr 28 06:18:59 CEST 2011 on sn-devel-104
This checks that Samba3 joins Samba4 correctly, and allows NTLM and
Kerberos logons from a live Samba4 DC.
This needs the common krb5.conf generation logic, and because we now
override KRB5_CONFIG we must update ktest to have a valid krb5.conf.
Based on an original patch by metze
Andrew Bartlett
This means that we control the connection setup, don't rely on signals
for timeouts and the connection uses socket_wrapper where that is
required in our test environment.
According to bug reports, this method is also used by curl and other
tools, so we are not the first to (ab)use the OpenLDAP libs in this
way.
It is ONLY enabled for socket_wrapper at this time, as this is the
best way to get 'make test' working for S3 winbind tests in an S4
domain.
Andrew Bartlett
this prevents error messages from logfile creation before smb.conf is
read
Pair-Programmed-With: Andrew Bartlett <abartlet@samba.org>
Autobuild-User: Andrew Tridgell <tridge@samba.org>
Autobuild-Date: Thu Apr 28 05:29:19 CEST 2011 on sn-devel-104
This breaks the fast path into handling for -1 and handling for
specified lenghts, avoding branch operations on each character.
Pair-Programmed-With: Andrew Bartlett <abartlet@samba.org>
Signed-off-by: Andrew Tridgell <tridge@samba.org>
This punts partial UTF16 strings to iconv() to deal with, as it's not
a fast path any longer if it's got an odd length.
Andrew Bartlett
Signed-off-by: Andrew Tridgell <tridge@samba.org>
This is no longer a feature of Samba4
Autobuild-User: Andrew Bartlett <abartlet@samba.org>
Autobuild-Date: Wed Apr 27 15:32:28 CEST 2011 on sn-devel-104
This ensures we follow the dynconfig convention for the socket
directory, and makes it easier to ensure that the client and server
both refer to the same socket.
Andrew Bartlett
Looking for smb.conf files with find -name \*.conf would find and not
find all sorts of things that were just not valid inputs. When
restricted to under source3 it then finds no inputs in the top level
build, as it only worked on the generated smb.conf files from 'make
test' environments.
Instead, just run it on the one file we know is valid, and if we want
to run it on more files, then we can make this test run against more
environments, or specific target files.
Andrew Bartlett
this check was causing the CP850 warning in the combined build, as the
s3 tests want CP850, but we don't have builtin support for that
charset
Pair-Programmed-With: Andrew Bartlett <abartlet@samba.org>
Autobuild-User: Andrew Tridgell <tridge@samba.org>
Autobuild-Date: Wed Apr 27 09:31:44 CEST 2011 on sn-devel-104
this fixes the top level build on svart and probably other hosts
Autobuild-User: Andrew Tridgell <tridge@samba.org>
Autobuild-Date: Wed Apr 27 08:27:49 CEST 2011 on sn-devel-104
Not all kerberos distributions have this function.
Andrew Bartlett
Autobuild-User: Andrew Bartlett <abartlet@samba.org>
Autobuild-Date: Wed Apr 27 07:39:08 CEST 2011 on sn-devel-104
This is constant data according to the man pages I find for this
fucntion, and causes a segfault to free() when linked to Heimdal. I
am advised that while it is constant for gss_mech_krb5, it may not be
for other mechanisms, so an assert will ensure this is dealt with by
the programmer who extends this code in future.
Andrew Bartlett
This only works for Heimdal and MIT Krb5 1.8, other versions will get
an ACCESS_DEINED error.
We no longer manually verify any details of the PAC in Samba for
GSSAPI logins, as we never had the information to do it properly, and
it is better to have the GSSAPI library handle it.
Andrew Bartlett
Signed-off-by: Jeremy Allison <jra@samba.org>
Autobuild-User: Jeremy Allison <jra@samba.org>
Autobuild-Date: Wed Apr 27 00:25:35 CEST 2011 on sn-devel-104
