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Issue 278: Memcached 1.4.13 segfaults (error 4) when SASL enabled
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Status:  New
Owner:  dsalli...@gmail.com


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Reported by douglas....@apollogrp.edu, Jun 25, 2012
What steps will reproduce the problem?
1.  Build the memcached code with the --enable-sasl switch to enable SSL
2.  Start memcached with SASL enabled (memcached -d -u nobody -m 1024 -p 11211 -S)
3.  Make a call to memcached using spymemcached client to do a set operation via a java class).  After running the java class a couple times, the memcached process on the server will crash.
4.  A segfault error will be present in /var/log/messages file.  

What is the expected output? What do you see instead?
Here is the output when the java class runs successfully:
2012-06-25 15:15:02.007 INFO net.spy.memcached.MemcachedConnection:  Added {QA sa=/<IP_ADDRESS>:11211, #Rops=0, #Wops=0, #iq=0, topRop=null, topWop=null, toWrite=0, interested=0} to connect queue
2012-06-25 15:15:02.038 INFO net.spy.memcached.MemcachedConnection:  Connection state changed for sun.nio.ch.SelectionKeyImpl@1e157985
2012-06-25 15:15:02.147 INFO net.spy.memcached.auth.AuthThread:  Authenticated to /<IP_ADDRESS>:11211
About to set(<VALUE>)
DONE!!


Here is the output when the java class runs unsuccessfully:
2012-06-25 15:13:24.074 INFO net.spy.memcached.MemcachedConnection:  Added {QA sa=/<IP_ADDRESS>:11211, #Rops=0, #Wops=0, #iq=0, topRop=null, topWop=null, toWrite=0, interested=0} to connect queue
2012-06-25 15:13:24.074 INFO net.spy.memcached.MemcachedConnection:  Connection state changed for sun.nio.ch.SelectionKeyImpl@13dd1a31
About to set(<VALUE>)
2012-06-25 15:13:24.308 WARN net.spy.memcached.auth.AuthThread:  Authentication failed to /<IP_ADDRESS>:11211
2012-06-25 15:13:24.324 WARN net.spy.memcached.protocol.binary.BinaryMemcachedNodeImpl:  Discarding partially completed op: SASL steps operation
2012-06-25 15:13:24.324 INFO net.spy.memcached.MemcachedConnection:  Reconnecting due to exception on {QA sa=/<IP_ADDRESS>:11211, #Rops=0, #Wops=0, #iq=0, topRop=null, topWop=null, toWrite=0, interested=1}
java.io.IOException: Disconnected unexpected, will reconnect.
	at net.spy.memcached.MemcachedConnection.handleReads(MemcachedConnection.java:452)
	at net.spy.memcached.MemcachedConnection.handleIO(MemcachedConnection.java:380)
	at net.spy.memcached.MemcachedConnection.handleIO(MemcachedConnection.java:242)
	at net.spy.memcached.MemcachedConnection.run(MemcachedConnection.java:833)
2012-06-25 15:13:24.324 WARN net.spy.memcached.MemcachedConnection:  Closing, and reopening {QA sa=/<IP_ADDRESS>:11211, #Rops=0, #Wops=0, #iq=0, topRop=null, topWop=null, toWrite=0, interested=1}, attempt 0.
2012-06-25 15:13:24.433 WARN net.spy.memcached.auth.AuthThread:  Authentication failed to /<IP_ADDRESS>:11211
2012-06-25 15:13:25.197 DONE!!
WARN net.spy.memcached.protocol.binary.BinaryMemcachedNodeImpl:  Operation canceled because authentication or reconnection and authentication has taken more than one second to complete.

What version of the product are you using? On what operating system?
memcached 1.4.13.  The operating system is Linux 2.6.18-194.11.1.0.1.el5 x86_64 GNU/Linux.

Please provide any additional information below.

The messages in the log will look something like this: 
Jun 25 14:56:08 b57734e849 kernel: memcached[5556]: segfault at 0000000000000010 rip 0000003abc80eea8 rsp 00000000428e4ed0 error 4
Jun 25 15:01:02 b57734e849 kernel: memcached[5737]: segfault at 0000000000000010 rip 0000003abc80eea8 rsp 0000000044598ed0 error 4
Jun 25 15:13:23 b57734e849 kernel: memcached[6174]: segfault at 0000000000000010 rip 0000003abc80eea8 rsp 00000000428cbed0 error 4
Jun 25 15:13:49 b57734e849 kernel: memcached[6199]: segfault at 0000000000000010 rip 0000003abc80eea8 rsp 0000000040f81ed0 error 4
Jun 25 15:14:13 b57734e849 kernel: memcached[6228]: segfault at 0000000000000010 rip 0000003abc80eea8 rsp 0000000040bd4ed0 error 4
Jun 25 15:14:19 b57734e849 kernel: memcached[6237]: segfault at 0000000000000010 rip 0000003abc80eea8 rsp 0000000042610ed0 error 4

Here is how the MemcacheClient object is configured:

	MemcachedClient memcachedClient = new MemcachedClient(new ConnectionFactoryBuilder()
					.setProtocol(Protocol.BINARY)
					.setTranscoder(new SerializingTranscoder(1024))
					.setOpTimeout(100)
					.setTimeoutExceptionThreshold(1998)
					.setHashAlg(DefaultHashAlgorithm.KETAMA_HASH)
					.setLocatorType(Locator.CONSISTENT)
					.setFailureMode(FailureMode.Redistribute)
					.setUseNagleAlgorithm(false)
			//  USE SASL
					.setAuthDescriptor(new AuthDescriptor(new String[]{"PLAIN"},
						new PlainCallbackHandler("memcached", "memcached")))

					.build(), 
					AddrUtil.getAddresses("<IP_ADDRESS>:11211"));


Jun 26, 2012
#1 alexey.s...@hivext.net
The same for me :(
Jun 26, 2012
#2 i...@hivext.net
Guys, can you please tell us where we need search for solution, it's very important for us. Thanks.
Jun 26, 2012
#3 i...@hivext.net
Guys, here is debug with GDB

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7ffff202a700 (LWP 5697)]
0x00007ffff77835ce in sasl_server_step (serveroutlen=0x7ffff2029c2c, serverout=0x7ffff2029c20, clientinlen=17, clientin=0x7ffff7e2a055 "", conn=0x47bf90) at ../../lib/server.c:1614
1614	../../lib/server.c: No such file or directory.



Jul 14, 2012
Project Member #4 dorma...@rydia.net
Can you include a gdb backtrace (bt)?
Owner: dsalli...@gmail.com
Jul 16, 2012
#6 douglas....@apollogrp.edu
gdb output attached.  i didn't see where the file went so i'll just paste the file in the comment box:

[root@<HOSTNAME> ~]# memcached -u nobody -d <IP_ADDRESS> -m 1024 -p 11211 -S
[root@<HOSTNAME> ~]# ps -eaf | grep nobody | grep -v grep
nobody   13883     1  0 10:04 ?        00:00:00 memcached -u nobody -d <IP_ADDRESS> -m 1024 -p 11211 -S
[root@<HOSTNAME> ~]# gdb --pid 13883
GNU gdb (GDB) Red Hat Enterprise Linux (7.0.1-23.el5_5.2)
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Attaching to process 13883
Reading symbols from /usr/local/bin/memcached...done.
Reading symbols from /usr/lib64/libevent-2.0.so.5...done.
Loaded symbols for /usr/lib64/libevent-2.0.so.5
Reading symbols from /lib64/librt.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib64/librt.so.1
Reading symbols from /usr/lib64/libsasl2.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib64/libsasl2.so.2
Reading symbols from /lib64/libpthread.so.0...(no debugging symbols found)...done.
[Thread debugging using libthread_db enabled]
[New Thread 0x44d64940 (LWP 13888)]
[New Thread 0x44363940 (LWP 13887)]
[New Thread 0x43962940 (LWP 13886)]
[New Thread 0x42f61940 (LWP 13885)]
[New Thread 0x42560940 (LWP 13884)]
Loaded symbols for /lib64/libpthread.so.0
Reading symbols from /lib64/libc.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib64/libc.so.6
Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
Reading symbols from /lib64/libdl.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib64/libdl.so.2
Reading symbols from /lib64/libresolv.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib64/libresolv.so.2
Reading symbols from /lib64/libcrypt.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib64/libcrypt.so.1
Reading symbols from /lib64/libnss_files.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib64/libnss_files.so.2
Reading symbols from /usr/lib64/sasl2/libplain.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib64/sasl2/libplain.so.2
Reading symbols from /usr/lib64/sasl2/libsasl2.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib64/sasl2/libsasl2.so
Reading symbols from /usr/lib64/sasl2/liblogin.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib64/sasl2/liblogin.so.2
Reading symbols from /usr/lib64/sasl2/libsasldb.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib64/sasl2/libsasldb.so.2
Reading symbols from /usr/lib64/sasl2/libanonymous.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib64/sasl2/libanonymous.so.2
0x0000003abc4d4108 in epoll_wait () from /lib64/libc.so.6
(gdb) bt
#0  0x0000003abc4d4108 in epoll_wait () from /lib64/libc.so.6
#1  0x00002b09a6e3d5d8 in epoll_dispatch (base=0x69ae7a0, tv=<value optimized out>) at epoll.c:407
#2  0x00002b09a6e2c2bc in event_base_loop (base=0x69ae7a0, flags=0) at event.c:1575
#3  0x00000000004089cc in main (argc=<value optimized out>, argv=<value optimized out>) at memcached.c:5224
(gdb) thread apply all bt

Thread 6 (Thread 0x42560940 (LWP 13884)):
#0  0x0000003abc4d4108 in epoll_wait () from /lib64/libc.so.6
#1  0x00002b09a6e3d5d8 in epoll_dispatch (base=0x69af220, tv=<value optimized out>) at epoll.c:407
#2  0x00002b09a6e2c2bc in event_base_loop (base=0x69af220, flags=0) at event.c:1575
#3  0x000000000040f654 in worker_libevent (arg=0x69b87f0) at thread.c:297
#4  0x0000003abd00673d in start_thread () from /lib64/libpthread.so.0
#5  0x0000003abc4d3d1d in clone () from /lib64/libc.so.6

Thread 5 (Thread 0x42f61940 (LWP 13885)):
#0  0x0000003abc4d4108 in epoll_wait () from /lib64/libc.so.6
#1  0x00002b09a6e3d5d8 in epoll_dispatch (base=0x69afa80, tv=<value optimized out>) at epoll.c:407
#2  0x00002b09a6e2c2bc in event_base_loop (base=0x69afa80, flags=0) at event.c:1575
#3  0x000000000040f654 in worker_libevent (arg=0x69bbb78) at thread.c:297
#4  0x0000003abd00673d in start_thread () from /lib64/libpthread.so.0
#5  0x0000003abc4d3d1d in clone () from /lib64/libc.so.6

Thread 4 (Thread 0x43962940 (LWP 13886)):
#0  0x0000003abc4d4108 in epoll_wait () from /lib64/libc.so.6
#1  0x00002b09a6e3d5d8 in epoll_dispatch (base=0x69b02c0, tv=<value optimized out>) at epoll.c:407
#2  0x00002b09a6e2c2bc in event_base_loop (base=0x69b02c0, flags=0) at event.c:1575
#3  0x000000000040f654 in worker_libevent (arg=0x69bef00) at thread.c:297
#4  0x0000003abd00673d in start_thread () from /lib64/libpthread.so.0
#5  0x0000003abc4d3d1d in clone () from /lib64/libc.so.6

Thread 3 (Thread 0x44363940 (LWP 13887)):
#0  0x0000003abc4d4108 in epoll_wait () from /lib64/libc.so.6
#1  0x00002b09a6e3d5d8 in epoll_dispatch (base=0x69b0b40, tv=<value optimized out>) at epoll.c:407
#2  0x00002b09a6e2c2bc in event_base_loop (base=0x69b0b40, flags=0) at event.c:1575
#3  0x000000000040f654 in worker_libevent (arg=0x69c2288) at thread.c:297
#4  0x0000003abd00673d in start_thread () from /lib64/libpthread.so.0
#5  0x0000003abc4d3d1d in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x44d64940 (LWP 13888)):
#0  0x0000003abd00aee9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x000000000040edb0 in assoc_maintenance_thread (arg=<value optimized out>) at assoc.c:235
#2  0x0000003abd00673d in start_thread () from /lib64/libpthread.so.0
#3  0x0000003abc4d3d1d in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x2b09a705fd40 (LWP 13883)):
#0  0x0000003abc4d4108 in epoll_wait () from /lib64/libc.so.6
#1  0x00002b09a6e3d5d8 in epoll_dispatch (base=0x69ae7a0, tv=<value optimized out>) at epoll.c:407
#2  0x00002b09a6e2c2bc in event_base_loop (base=0x69ae7a0, flags=0) at event.c:1575
#3  0x00000000004089cc in main (argc=<value optimized out>, argv=<value optimized out>) at memcached.c:5224
(gdb)

Jul 16, 2012
Project Member #7 dsalli...@gmail.com
We need the backtrace during a crash, not on a properly functioning server.
Jul 16, 2012
#8 douglas....@apollogrp.edu
I'm new to this GDB thing so sorry about the wrong stack trace.  This link helped me to figure out how to get a core dump on a process crash:  http://www.randombugs.com/linux/core-dumps-linux.html.  Let me know if this is still not what you are looking for.  


[root@<HOSTNAME> dumps]# gdb memcached core.memcached.20237
GNU gdb (GDB) Red Hat Enterprise Linux (7.0.1-23.el5_5.2)
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/local/bin/memcached...done.
[New Thread 20242]
[New Thread 20241]
[New Thread 20240]
[New Thread 20238]
[New Thread 20237]
Reading symbols from /usr/lib64/libevent-2.0.so.5...done.
Loaded symbols for /usr/lib64/libevent-2.0.so.5
Reading symbols from /lib64/librt.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib64/librt.so.1
Reading symbols from /usr/lib64/libsasl2.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib64/libsasl2.so.2
Reading symbols from /lib64/libpthread.so.0...(no debugging symbols found)...done.
Loaded symbols for /lib64/libpthread.so.0
Reading symbols from /lib64/libc.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib64/libc.so.6
Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
Reading symbols from /lib64/libdl.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib64/libdl.so.2
Reading symbols from /lib64/libresolv.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib64/libresolv.so.2
Reading symbols from /lib64/libcrypt.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib64/libcrypt.so.1
Reading symbols from /usr/lib64/sasl2/libplain.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib64/sasl2/libplain.so.2
Reading symbols from /usr/lib64/sasl2/libsasl2.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib64/sasl2/libsasl2.so
Reading symbols from /usr/lib64/sasl2/liblogin.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib64/sasl2/liblogin.so.2
Reading symbols from /usr/lib64/sasl2/libsasldb.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib64/sasl2/libsasldb.so.2
Reading symbols from /usr/lib64/sasl2/libanonymous.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib64/sasl2/libanonymous.so.2
Core was generated by `/usr/local/bin/memcached -d -p 11211 -u nobody -c 640 -m 1024 -S'.
Program terminated with signal 11, Segmentation fault.
#0  0x0000003abc80eea8 in sasl_server_step () from /usr/lib64/libsasl2.so.2
(gdb) bt
#0  0x0000003abc80eea8 in sasl_server_step () from /usr/lib64/libsasl2.so.2
#1  0x0000000000405777 in process_bin_complete_sasl_auth (c=0x1189dd00) at memcached.c:1716
#2  0x000000000040b897 in drive_machine (fd=<value optimized out>, which=9248, arg=0x1189dd00) at memcached.c:3869
#3  event_handler (fd=<value optimized out>, which=9248, arg=0x1189dd00) at memcached.c:4073
#4  0x00002af8682e0679 in event_process_active_single_queue (base=0x117f07f0, flags=0) at event.c:1325
#5  event_process_active (base=0x117f07f0, flags=0) at event.c:1392
#6  event_base_loop (base=0x117f07f0, flags=0) at event.c:1589
#7  0x000000000040f654 in worker_libevent (arg=0x117fc8e8) at thread.c:297
#8  0x0000003abd00673d in start_thread () from /lib64/libpthread.so.0
#9  0x0000003abc4d3d1d in clone () from /lib64/libc.so.6
(gdb) thread apply all bt

Thread 6 (Thread 20237):
#0  0x0000003abc4d4108 in epoll_wait () from /lib64/libc.so.6
#1  0x00002af8682f15d8 in epoll_dispatch (base=0x117ef510, tv=<value optimized out>) at epoll.c:407
#2  0x00002af8682e02bc in event_base_loop (base=0x117ef510, flags=0) at event.c:1575
#3  0x00000000004089cc in main (argc=<value optimized out>, argv=<value optimized out>) at memcached.c:5224

Thread 5 (Thread 20238):
#0  0x0000003abc4d4108 in epoll_wait () from /lib64/libc.so.6
#1  0x00002af8682f15d8 in epoll_dispatch (base=0x117eff90, tv=<value optimized out>) at epoll.c:407
#2  0x00002af8682e02bc in event_base_loop (base=0x117eff90, flags=0) at event.c:1575
#3  0x000000000040f654 in worker_libevent (arg=0x117f9560) at thread.c:297
#4  0x0000003abd00673d in start_thread () from /lib64/libpthread.so.0
#5  0x0000003abc4d3d1d in clone () from /lib64/libc.so.6

Thread 4 (Thread 20240):
#0  0x0000003abc4d4108 in epoll_wait () from /lib64/libc.so.6
#1  0x00002af8682f15d8 in epoll_dispatch (base=0x117f1030, tv=<value optimized out>) at epoll.c:407
#2  0x00002af8682e02bc in event_base_loop (base=0x117f1030, flags=0) at event.c:1575
#3  0x000000000040f654 in worker_libevent (arg=0x117ffc70) at thread.c:297
#4  0x0000003abd00673d in start_thread () from /lib64/libpthread.so.0
#5  0x0000003abc4d3d1d in clone () from /lib64/libc.so.6

Thread 3 (Thread 20241):
#0  0x0000003abc4d4108 in epoll_wait () from /lib64/libc.so.6
#1  0x00002af8682f15d8 in epoll_dispatch (base=0x117f18b0, tv=<value optimized out>) at epoll.c:407
#2  0x00002af8682e02bc in event_base_loop (base=0x117f18b0, flags=0) at event.c:1575
#3  0x000000000040f654 in worker_libevent (arg=0x11802ff8) at thread.c:297
#4  0x0000003abd00673d in start_thread () from /lib64/libpthread.so.0
#5  0x0000003abc4d3d1d in clone () from /lib64/libc.so.6

Thread 2 (Thread 20242):
#0  0x0000003abd00aee9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x000000000040edb0 in assoc_maintenance_thread (arg=<value optimized out>) at assoc.c:235
#2  0x0000003abd00673d in start_thread () from /lib64/libpthread.so.0
#3  0x0000003abc4d3d1d in clone () from /lib64/libc.so.6

Thread 1 (Thread 20239):
#0  0x0000003abc80eea8 in sasl_server_step () from /usr/lib64/libsasl2.so.2
#1  0x0000000000405777 in process_bin_complete_sasl_auth (c=0x1189dd00) at memcached.c:1716
#2  0x000000000040b897 in drive_machine (fd=<value optimized out>, which=9248, arg=0x1189dd00) at memcached.c:3869
#3  event_handler (fd=<value optimized out>, which=9248, arg=0x1189dd00) at memcached.c:4073
#4  0x00002af8682e0679 in event_process_active_single_queue (base=0x117f07f0, flags=0) at event.c:1325
#5  event_process_active (base=0x117f07f0, flags=0) at event.c:1392
#6  event_base_loop (base=0x117f07f0, flags=0) at event.c:1589
#7  0x000000000040f654 in worker_libevent (arg=0x117fc8e8) at thread.c:297
#8  0x0000003abd00673d in start_thread () from /lib64/libpthread.so.0
#9  0x0000003abc4d3d1d in clone () from /lib64/libc.so.6

Jul 29, 2012
Project Member #9 dorma...@rydia.net
Dustin? Any clue?
Jul 29, 2012
Project Member #10 dsalli...@gmail.com
Almost seems like a library problem.  Are you running on the same system you built on?  Any weird (non-package) sasl parts there?

I'll do some fuzzing around it to see if I can induce a crash, but it's a bit hard to see from here as that's a pretty well tested path.

While I'm doing that, if you can make it happen with -vv on the server, the output of that might gives us more details.
Jul 31, 2012
#11 douglas....@apollogrp.edu
[root@<HOST_NAME> ~]# memcached -d -u nobody -m 1024 -p 11211 -S -vv
Initialized SASL.
slab class   1: chunk size        96 perslab   10922
slab class   2: chunk size       120 perslab    8738
slab class   3: chunk size       152 perslab    6898
slab class   4: chunk size       192 perslab    5461
slab class   5: chunk size       240 perslab    4369
slab class   6: chunk size       304 perslab    3449
slab class   7: chunk size       384 perslab    2730
slab class   8: chunk size       480 perslab    2184
slab class   9: chunk size       600 perslab    1747
slab class  10: chunk size       752 perslab    1394
slab class  11: chunk size       944 perslab    1110
slab class  12: chunk size      1184 perslab     885
slab class  13: chunk size      1480 perslab     708
slab class  14: chunk size      1856 perslab     564
slab class  15: chunk size      2320 perslab     451
slab class  16: chunk size      2904 perslab     361
slab class  17: chunk size      3632 perslab     288
slab class  18: chunk size      4544 perslab     230
slab class  19: chunk size      5680 perslab     184
slab class  20: chunk size      7104 perslab     147
slab class  21: chunk size      8880 perslab     118
slab class  22: chunk size     11104 perslab      94
slab class  23: chunk size     13880 perslab      75
slab class  24: chunk size     17352 perslab      60
slab class  25: chunk size     21696 perslab      48
slab class  26: chunk size     27120 perslab      38
slab class  27: chunk size     33904 perslab      30
slab class  28: chunk size     42384 perslab      24
slab class  29: chunk size     52984 perslab      19
slab class  30: chunk size     66232 perslab      15
slab class  31: chunk size     82792 perslab      12
slab class  32: chunk size    103496 perslab      10
slab class  33: chunk size    129376 perslab       8
slab class  34: chunk size    161720 perslab       6
slab class  35: chunk size    202152 perslab       5
slab class  36: chunk size    252696 perslab       4
slab class  37: chunk size    315872 perslab       3
slab class  38: chunk size    394840 perslab       2
slab class  39: chunk size    493552 perslab       2
slab class  40: chunk size    616944 perslab       1
slab class  41: chunk size    771184 perslab       1
slab class  42: chunk size   1048576 perslab       1
[root@<HOST_NAME> ~]# <26 server listening (binary)
<27 server listening (binary)
<28 send buffer was 129024, now 268435456
<28 server listening (udp)
<28 server listening (udp)
<29 send buffer was 129024, now 268435456
<29 server listening (udp)
<29 server listening (udp)
<28 server listening (udp)
<29 server listening (udp)
<28 server listening (udp)
<29 server listening (udp)
[root@<HOST_NAME> ~]# ps -eaf |grep memcached | grep -v grep
nobody   12188     1  0 09:48 ?        00:00:00 memcached -d -u nobody -m 1024 -p 11211 -S -vv
[root@<HOST_NAME> ~]# <30 new binary client connection.
<30 Read binary protocol data:
<30    0x80 0x22 0x00 0x05
<30    0x00 0x00 0x00 0x00
<30    0x00 0x00 0x00 0x19
<30    0x00 0x00 0x00 0x03
<30    0x00 0x00 0x00 0x00
<30    0x00 0x00 0x00 0x00
authenticated() in cmd 0x22 is true
mech:  ``PLAIN'' with 20 bytes of data

[root@<HOST_NAME> ~]# ps -eaf |grep memcached | grep -v grep
[root@<HOST_NAME> ~]#

Jul 31, 2012
#12 douglas....@apollogrp.edu
I am running on the same system I built on.  There were no SASL libraries existing when I installed on this box.  Here are the steps I performed to install memcached:


FTP these files to the box as mylogin

put libevent-2.0.16-stable.tar.gz
put memcached-1.4.13.tar.gz

SSH to the box and run the following commands as root

cd ~mylogin

tar -zxvf libevent-2.0.16-stable.tar.gz
cd libevent-2.0.16-stable
./configure --prefix=/usr/local
make
make install

cd ..

ln -s /usr/local/lib/libevent-2.0.so.5 /usr/lib64/libevent-2.0.so.5
yum install cyrus-sasl-devel-2.1.22

tar -zxvf memcached-1.4.13
cd memcached-1.4.13
./configure --enable-sasl
make
make install

saslpasswd2 -a memcached -c memcached 
> memcached	  //Enter password
> memcached   //Validate password

chmod 660 /etc/sasldb2

Start memcached with SASL:

memcached -d -u nobody -m 1024 -p 11211 -S

Jul 31, 2012
Project Member #13 dsalli...@gmail.com
Thanks for all the info.  This is definitely golden path stuff, so something odd is going on.
Sep 19, 2012
#14 lgromano...@gmail.com
Hi,
I'm observing similar segfault on memcached v1.4.15 (memcached 1.4.15-1) from ArchLinux (stable), unfortunately I don't have any backtraces yet (it's on production server) but I will try to get as much information as I can.
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