Hi, we've been using 1.2.6 on amd64 for months without a single problem,
but we want to migrate from 2 x 16GB machines to 16 x 4G 32-bit machines
for better survivability.
Unfortunately we're getting a lot of segfaults both with 1.2.6 and
1.2.8 :(
This is the backtrace I get from a 1.2.6-debug instance (I have since
started gdb on a 1.2.8-debug instance to get the 'latest and greatest)
Hopefully this will mean something to a dev, because I'm gradually
losing my sanity.
calloc()Starting program: /usr/local/sbin/memcached-debug -m 3200 -p
11211 -u nobody -c 4096 -t 10
[Thread debugging using libthread_db enabled]
[New Thread 0xb7da96b0 (LWP 24417)]
[New Thread 0xb7d47b90 (LWP 24420)]
[New Thread 0xb7546b90 (LWP 24421)]
[New Thread 0xb6d45b90 (LWP 24422)]
[New Thread 0xb6544b90 (LWP 24423)]
[New Thread 0xb5d43b90 (LWP 24424)]
[New Thread 0xb5542b90 (LWP 24425)]
[New Thread 0xb4d41b90 (LWP 24426)]
[New Thread 0xb4540b90 (LWP 24427)]
[New Thread 0xb3d3fb90 (LWP 24428)]
calloc()
calloc()
[ maybe 100 of these...]
calloc()
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb6544b90 (LWP 24423)]
0x0804a069 in add_iov (c=0x9b69cf0, buf=0x9ea32e0, len=44) at
memcached.c:683
683 memcached.c: No such file or directory.
in memcached.c
(gdb)
(gdb) bt
#0 0x0804a069 in add_iov (c=0x9b69cf0, buf=0x9ea32e0, len=44) at
memcached.c:683
#1 0x0804ded3 in event_handler (fd=295, which=2, arg=0x9b69cf0) at
memcached.c:2317
#2 0xb7f5b9e2 in event_base_loop () from /usr/lib/libevent-1.3e.so.1
#3 0x08051807 in worker_libevent (arg=0x993a3a8) at thread.c:324
#4 0xb7de74c0 in start_thread () from /lib/i686/cmov/libpthread.so.0
#5 0xb7edb6de in clone () from /lib/i686/cmov/libc.so.6
(gdb)
The servers hosting these are little low-power VIA EPIA / Intel Atom
boxes.. load average is zero and they are dedicated to memcached,
running Debian lenny.
We typically have 10 clients making a total of 500-1000 simultaneous TCP
connections (shown by netstat) to each mc server.
libc6 is 2.7-18, linux-image 2.6.26-13
Cheers,
Gavin
