Comment #18 on issue 260 by edwardqu...@gmail.com: memcached big bug
http://code.google.com/p/memcached/issues/detail?id=260
Here is a back trace. I get the segmentation error every day (fedora 18
memcached-1.4.15-2.fc18.i686)
[root@www2 quick]# gdb memcached 9128
GNU gdb (GDB) Fedora (7.5.1-36.fc18)
Copyright (C) 2012 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 "i686-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/bin/memcached...Reading symbols from
/usr/lib/debug/usr/bin/memcached.debug...done.
done.
Attaching to program: /usr/bin/memcached, process 9128
Reading symbols from /lib/libevent-2.0.so.5...Reading symbols from
/usr/lib/debug/usr/lib/libevent-2.0.so.5.1.6.debug...done.
done.
Loaded symbols for /lib/libevent-2.0.so.5
Reading symbols from /lib/librt.so.1...Reading symbols from
/usr/lib/debug/lib/librt-2.16.so.debug...done.
done.
Loaded symbols for /lib/librt.so.1
Reading symbols from /lib/libpthread.so.0...Reading symbols from
/usr/lib/debug/lib/libpthread-2.16.so.debug...done.
done.
[New LWP 9133]
[New LWP 9132]
[New LWP 9131]
[New LWP 9130]
[New LWP 9129]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/libthread_db.so.1".
Loaded symbols for /lib/libpthread.so.0
Reading symbols from /lib/libc.so.6...Reading symbols from
/usr/lib/debug/lib/libc-2.16.so.debug...done.
done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /lib/ld-linux.so.2...Reading symbols from
/usr/lib/debug/lib/ld-2.16.so.debug...done.
done.
Loaded symbols for /lib/ld-linux.so.2
Reading symbols from /lib/libnss_files.so.2...Reading symbols from
/usr/lib/debug/lib/libnss_files-2.16.so.debug...done.
done.
Loaded symbols for /lib/libnss_files.so.2
0xb77dc416 in __kernel_vsyscall ()
(gdb) where
#0 0xb77dc416 in __kernel_vsyscall ()
#1 0xb76a2a96 in epoll_wait () at ../sysdeps/unix/syscall-template.S:81
#2 0xb77a9968 in epoll_dispatch (base=0x9f48de8, tv=0xbfb93040) at
epoll.c:407
#3 0xb7793132 in event_base_loop (base=0x9f48de8, flags=0) at event.c:1590
#4 0x0804baae in main (argc=10, argv=0xbfb94204) at memcached.c:5228
(gdb) where
#0 0xb77dc416 in __kernel_vsyscall ()
#1 0xb76a2a96 in epoll_wait () at ../sysdeps/unix/syscall-template.S:81
#2 0xb77a9968 in epoll_dispatch (base=0x9f48de8, tv=0xbfb93040) at
epoll.c:407
#3 0xb7793132 in event_base_loop (base=0x9f48de8, flags=0) at event.c:1590
#4 0x0804baae in main (argc=10, argv=0xbfb94204) at memcached.c:5228
(gdb) bt
#0 0xb77dc416 in __kernel_vsyscall ()
#1 0xb76a2a96 in epoll_wait () at ../sysdeps/unix/syscall-template.S:81
#2 0xb77a9968 in epoll_dispatch (base=0x9f48de8, tv=0xbfb93040) at
epoll.c:407
#3 0xb7793132 in event_base_loop (base=0x9f48de8, flags=0) at event.c:1590
#4 0x0804baae in main (argc=10, argv=0xbfb94204) at memcached.c:5228
(gdb) thread
[Current thread is 1 (Thread 0xb75ab6c0 (LWP 9128))]
(gdb) c
Continuing.
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb655ab40 (LWP 9131)]
do_slabs_alloc (id=1, size=size@entry=76) at slabs.c:241
241 p->slots = it->next;
(gdb) bt
#0 do_slabs_alloc (id=1, size=size@entry=76) at slabs.c:241
#1 slabs_alloc (size=size@entry=76, id=id@entry=1) at slabs.c:404
#2 0x0805644d in do_item_alloc (key=0xb49fff30 "my_wiki:stats:pcache_hit\n
0 3\r\n559\r\n9\r\n\n", nkey=24, flags=0, exptime=exptime@entry=0,
nbytes=nbytes@entry=5, cur_hv=cur_hv@entry=123356228) at items.c:188
#3 0x080535fa in do_add_delta (c=c@entry=0xb4a23988,
key=key@entry=0xb4a25e2d "my_wiki:stats:pcache_hit", nkey=nkey@entry=24,
incr=true, delta=1,
buf=buf@entry=0xb655a0b4 "560", cas=cas@entry=0x0,
hv=hv@entry=123356228) at memcached.c:3102
#4 0x080586e5 in add_delta (c=c@entry=0xb4a23988,
key=key@entry=0xb4a25e2d "my_wiki:stats:pcache_hit", nkey=nkey@entry=24,
incr=incr@entry=1, delta=1,
buf=buf@entry=0xb655a0b4 "560", cas=cas@entry=0x0) at thread.c:585
#5 0x0804da3d in process_arithmetic_command (c=c@entry=0xb4a23988,
tokens=tokens@entry=0xb655a140, ntokens=ntokens@entry=4,
incr=incr@entry=true)
at memcached.c:3015
#6 0x080506cc in process_command (c=c@entry=0xb4a23988, command=<optimized
out>) at memcached.c:3266
#7 0x08050f23 in try_read_command (c=0xb4a23988) at memcached.c:3504
#8 drive_machine (c=0xb4a23988) at memcached.c:3824
#9 event_handler (fd=30, which=2, arg=0xb4a23988) at memcached.c:4065
#10 0xb77933da in event_process_active_single_queue (activeq=<optimized
out>, base=<optimized out>) at event.c:1340
#11 event_process_active (base=<optimized out>) at event.c:1407
#12 event_base_loop (base=0x9f6eaf0, flags=flags@entry=0) at event.c:1604
#13 0x08057cdf in worker_libevent (arg=0x9f67a68) at thread.c:384
#14 0xb7769aff in start_thread (arg=0xb655ab40) at pthread_create.c:308
#15 0xb76a209e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:132
(gdb)
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