Comment #7 on issue 403 by dpmc...@gmail.com: Memcached 1.4.23 crashes on
stats command
https://code.google.com/p/memcached/issues/detail?id=403
I don't get a hard crash here, but I do get a hard lockup. This looks like
a similar situation to the comment I just made on #404- things get weird
when hardware lock elision comes into play. It works fine, no lockups, on
my older x86_64 machine.
0x00007f9c3d9b2883 in epoll_wait () from /usr/lib/libc.so.6
(gdb) thread apply all backtrace
Thread 6 (Thread 0x7f9c3d8c9700 (LWP 12250)):
#0 0x00007f9c3d9b2883 in epoll_wait () from /usr/lib/libc.so.6
#1 0x00007f9c3deaf4d8 in ?? () from /usr/lib/libevent-2.0.so.5
#2 0x00007f9c3de9a61a in event_base_loop () from /usr/lib/libevent-2.0.so.5
#3 0x000000000041add4 in worker_libevent (arg=0x817480) at thread.c:379
#4 0x00007f9c3dc74374 in start_thread () from /usr/lib/libpthread.so.0
#5 0x00007f9c3d9b227d in clone () from /usr/lib/libc.so.6
Thread 5 (Thread 0x7f9c3d0c8700 (LWP 12251)):
#0 0x00007f9c3dc7c64c in __lll_lock_wait () from /usr/lib/libpthread.so.0
#1 0x00007f9c3dc7f090 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=0x7f9c34026200) 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=0x7f9c34026200)
at slabs.c:309
#4 0x000000000040ef1d in process_stat (ntokens=<optimized out>,
tokens=0x7f9c3d0c7cd0, c=0x7f9c34026200) at memcached.c:2808
#5 process_command (c=c@entry=0x7f9c34026200, command=<optimized out>) at
memcached.c:3491
#6 0x000000000040fc39 in try_read_command (c=0x7f9c34026200) at
memcached.c:3796
#7 drive_machine (c=0x7f9c34026200) at memcached.c:4141
#8 event_handler (fd=<optimized out>, which=<optimized out>,
arg=0x7f9c34026200) at memcached.c:4386
#9 0x00007f9c3de9aca6 in event_base_loop () from /usr/lib/libevent-2.0.so.5
#10 0x000000000041add4 in worker_libevent (arg=0x8185c8) at thread.c:379
#11 0x00007f9c3dc74374 in start_thread () from /usr/lib/libpthread.so.0
#12 0x00007f9c3d9b227d in clone () from /usr/lib/libc.so.6
Thread 4 (Thread 0x7f9c3c8c7700 (LWP 12252)):
#0 0x00007f9c3d9b2883 in epoll_wait () from /usr/lib/libc.so.6
#1 0x00007f9c3deaf4d8 in ?? () from /usr/lib/libevent-2.0.so.5
#2 0x00007f9c3de9a61a in event_base_loop () from /usr/lib/libevent-2.0.so.5
#3 0x000000000041add4 in worker_libevent (arg=0x819710) at thread.c:379
#4 0x00007f9c3dc74374 in start_thread () from /usr/lib/libpthread.so.0
#5 0x00007f9c3d9b227d in clone () from /usr/lib/libc.so.6
Thread 3 (Thread 0x7f9c3c0c6700 (LWP 12253)):
#0 0x00007f9c3d9b2883 in epoll_wait () from /usr/lib/libc.so.6
#1 0x00007f9c3deaf4d8 in ?? () from /usr/lib/libevent-2.0.so.5
#2 0x00007f9c3de9a61a in event_base_loop () from /usr/lib/libevent-2.0.so.5
#3 0x000000000041add4 in worker_libevent (arg=0x81a858) at thread.c:379
#4 0x00007f9c3dc74374 in start_thread () from /usr/lib/libpthread.so.0
#5 0x00007f9c3d9b227d in clone () from /usr/lib/libc.so.6
Thread 2 (Thread 0x7f9c3b8c5700 (LWP 12254)):
#0 0x00007f9c3dc799af 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 0x00007f9c3dc74374 in start_thread () from /usr/lib/libpthread.so.0
#3 0x00007f9c3d9b227d in clone () from /usr/lib/libc.so.6
Thread 1 (Thread 0x7f9c3e2de700 (LWP 12249)):
#0 0x00007f9c3d9b2883 in epoll_wait () from /usr/lib/libc.so.6
#1 0x00007f9c3deaf4d8 in ?? () from /usr/lib/libevent-2.0.so.5
#2 0x00007f9c3de9a61a in event_base_loop () from /usr/lib/libevent-2.0.so.5
#3 0x0000000000404eea in main (argc=0, argv=0x0) at memcached.c:5724
works:
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Core(TM)2 Quad CPU Q9400 @ 2.66GHz
stepping : 10
microcode : 0xa0b
cpu MHz : 2000.000
cache size : 3072 KB
physical id : 0
siblings : 4
core id : 0
cpu cores : 4
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
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
lm constant_tsc arch_perfmon pebs bts rep_good nopl aperfmperf pni dtes64
monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 xsave lahf_lm
dtherm tpr_shadow vnmi flexpriority
broken:
vendor_id : GenuineIntel
cpu family : 6
model : 60
model name : Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz
stepping : 3
microcode : 0x12
cpu MHz : 3874.539
cache size : 8192 KB
physical id : 0
siblings : 8
core id : 3
cpu cores : 4
apicid : 7
initial apicid : 7
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
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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