Comment #2 on issue 404 by dpmc...@gmail.com: memcached 1.4.23 fails test
binary_prependq on Solaris 10 Sparc 64 Bit
https://code.google.com/p/memcached/issues/detail?id=404
I'm seeing this on Arch Linux as well.
This is similar to an earlier issue I have seen in that I think it might
have to do with hardware lock elision:
https://groups.google.com/d/msg/memcached/Tw6t_W-a6Xc/lXgz8LQ_vS0J
It doesn't lock up on my much older x86_64 desktop machine, but it does
lock up on our build box. gdb output below of the hung process during the
binary_prependq test. Notice Thread 3 especially.
$ sudo gdb -p 10999
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Attaching to process 10999
Reading symbols from
/home/dan/svn-packages/memcached/trunk/src/memcached-1.4.23/memcached-debug...done.
Reading symbols from /usr/lib/libevent-2.0.so.5...(no debugging symbols
found)...done.
Reading symbols from /usr/lib/libpthread.so.0...(no debugging symbols
found)...done.
[New LWP 11004]
[New LWP 11003]
[New LWP 11002]
[New LWP 11001]
[New LWP 11000]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
Reading symbols from /usr/lib/libc.so.6...(no debugging symbols
found)...done.
Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols
found)...done.
0x00007fad9dec6883 in epoll_wait () from /usr/lib/libc.so.6
(gdb) thread apply all backtrace
Thread 6 (Thread 0x7fad9dddd700 (LWP 11000)):
#0 0x00007fad9dec6883 in epoll_wait () from /usr/lib/libc.so.6
#1 0x00007fad9e3c34d8 in ?? () from /usr/lib/libevent-2.0.so.5
#2 0x00007fad9e3ae61a in event_base_loop () from /usr/lib/libevent-2.0.so.5
#3 0x000000000041add4 in worker_libevent (arg=0x1f99480) at thread.c:379
#4 0x00007fad9e188374 in start_thread () from /usr/lib/libpthread.so.0
#5 0x00007fad9dec627d in clone () from /usr/lib/libc.so.6
Thread 5 (Thread 0x7fad9d5dc700 (LWP 11001)):
#0 0x00007fad9dec6883 in epoll_wait () from /usr/lib/libc.so.6
#1 0x00007fad9e3c34d8 in ?? () from /usr/lib/libevent-2.0.so.5
#2 0x00007fad9e3ae61a in event_base_loop () from /usr/lib/libevent-2.0.so.5
#3 0x000000000041add4 in worker_libevent (arg=0x1f9a5c8) at thread.c:379
#4 0x00007fad9e188374 in start_thread () from /usr/lib/libpthread.so.0
#5 0x00007fad9dec627d in clone () from /usr/lib/libc.so.6
Thread 4 (Thread 0x7fad9cddb700 (LWP 11002)):
#0 0x00007fad9dec6883 in epoll_wait () from /usr/lib/libc.so.6
#1 0x00007fad9e3c34d8 in ?? () from /usr/lib/libevent-2.0.so.5
#2 0x00007fad9e3ae61a in event_base_loop () from /usr/lib/libevent-2.0.so.5
#3 0x000000000041add4 in worker_libevent (arg=0x1f9b710) at thread.c:379
#4 0x00007fad9e188374 in start_thread () from /usr/lib/libpthread.so.0
#5 0x00007fad9dec627d in clone () from /usr/lib/libc.so.6
Thread 3 (Thread 0x7fad9c5da700 (LWP 11003)):
#0 0x00007fad9e19064c in __lll_lock_wait () from /usr/lib/libpthread.so.0
#1 0x00007fad9e193090 in __lll_lock_elision () from
/usr/lib/libpthread.so.0
#2 0x00000000004183c9 in item_stats_totals
(add_stats=add_stats@entry=0x4067d0 <append_stats>,
c=c@entry=0x7fad940008c0) at items.c:506
#3 0x0000000000414c57 in get_stats (stat_type=stat_type@entry=0x0,
nkey=nkey@entry=0, add_stats=add_stats@entry=0x4067d0 <append_stats>,
c=c@entry=0x7fad940008c0) at slabs.c:309
#4 0x000000000040cee0 in process_bin_stat (c=0x7fad940008c0) at
memcached.c:1514
#5 complete_nread_binary (c=0x7fad940008c0) at memcached.c:2247
#6 complete_nread (c=c@entry=0x7fad940008c0) at memcached.c:2293
#7 0x00000000004101d0 in drive_machine (c=0x7fad940008c0) at
memcached.c:4179
#8 event_handler (fd=<optimized out>, which=<optimized out>,
arg=0x7fad940008c0) at memcached.c:4386
#9 0x00007fad9e3aeca6 in event_base_loop () from /usr/lib/libevent-2.0.so.5
#10 0x000000000041add4 in worker_libevent (arg=0x1f9c858) at thread.c:379
#11 0x00007fad9e188374 in start_thread () from /usr/lib/libpthread.so.0
#12 0x00007fad9dec627d in clone () from /usr/lib/libc.so.6
Thread 2 (Thread 0x7fad9bdd9700 (LWP 11004)):
#0 0x00007fad9e18d9af in pthread_cond_wait@@GLIBC_2.3.2 () from
/usr/lib/libpthread.so.0
#1 0x000000000041a510 in assoc_maintenance_thread (arg=<optimized out>) at
assoc.c:261
#2 0x00007fad9e188374 in start_thread () from /usr/lib/libpthread.so.0
#3 0x00007fad9dec627d in clone () from /usr/lib/libc.so.6
Thread 1 (Thread 0x7fad9e7f2700 (LWP 10999)):
#0 0x00007fad9dec6883 in epoll_wait () from /usr/lib/libc.so.6
#1 0x00007fad9e3c34d8 in ?? () from /usr/lib/libevent-2.0.so.5
#2 0x00007fad9e3ae61a in event_base_loop () from /usr/lib/libevent-2.0.so.5
#3 0x0000000000404eea in main (argc=0, argv=0x7fff82d49fd5) at
memcached.c:5724
ok 47 - binary_prependq
Timeout.. killing the process
testapp: testapp.c:725: safe_recv: Assertion `nr != 0' failed.
Makefile:1482: recipe for target 'test' failed
make: *** [test] Aborted
processor : 7
vendor_id : GenuineIntel
cpu family : 6
model : 60
model name : Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz
stepping : 3
microcode : 0x12
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat
pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb
rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology
nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx smx
est tm2 ssse3 fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt
tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm ida arat pln pts
dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 hle
avx2 smep bmi2 erms invpcid rtm xsaveopt
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