bug 506986
brassow
clvmd: Fix segfault.
I don't know /why/ it is failing... and I don't even know
exactly where the problem gets started, but here is what
I've found so far...
>From the core dump:
Program terminated with signal 11, Segmentation fault.
#0 persistent_filter_wipe (f=0x0) at filters/filter-persistent.c:54
54 struct pfilter *pf = (struct pfilter *) f->private;
(gdb) bt
#0 persistent_filter_wipe (f=0x0) at filters/filter-persistent.c:54
#1 0x000000000041d83a in dev_iter_create (f=0x0, dev_scan=1) at device/dev-cache.c:740
#2 0x0000000000416b85 in lvmcache_label_scan (cmd=0x112aacd0, full_scan=2) at cache/lvmcache.c:463
#3 0x0000000000410ad0 in do_refresh_cache () at lvm-functions.c:606
#4 0x000000000040d3ea in do_command (client=0x11441fd0, msg=<value optimized out>, msglen=30,
buf=0x4296a0c0, buflen=1481, retlen=0x4296a0cc) at clvmd-command.c:127
#5 0x000000000040e973 in lvm_thread_fn (arg=<value optimized out>) at clvmd.c:1554
#6 0x0000003992a064a7 in start_thread () from /lib64/libpthread.so.0
#7 0x00000039922d3c2d in clone () from /lib64/libc.so.6
'f' is being dereferenced in persistent_filter_wipe - initially provided by
lvmcache_label_scan, here:
463 if (!(iter = dev_iter_create(cmd->filter, (full_scan == 2) ? 1 : 0))) {
464 log_error("dev_iter creation failed");
465 goto out;
466 }
'cmd->filter' isn't set because 'refresh_toolcontext' failed in
do_refresh_cache:
604 ret = refresh_toolcontext(cmd);
605 init_full_scan_done(0);
606 lvmcache_label_scan(cmd, 2);
(gdb) p ret
$2 = 0
'refresh_toolcontext' failed at
_init_lvm_conf->_load_config_file->read_config_file->read_config_fd'
client=0x114f6090, msg=(nil), len=0, csid=(nil), xid=10574
/etc/lvm/lvm.conf: mmap failed: Bad file descriptor
/etc/lvm/lvm.conf: munmap failed: Invalid argument
/etc/lvm/lvm.conf: close failed: Bad file descriptor
Failed to load config file /etc/lvm/lvm.conf
Is the file descriptor being lost, corrupted, etc?
This patch is a band-aid for the problem.
Index: LVM2/daemons/clvmd/lvm-functions.c
===================================================================
--- LVM2.orig/daemons/clvmd/lvm-functions.c
+++ LVM2/daemons/clvmd/lvm-functions.c
@@ -593,20 +593,21 @@ int do_check_lvm1(const char *vgname)
int do_refresh_cache()
{
- int ret;
DEBUGLOG("Refreshing context\n");
log_notice("Refreshing context");
pthread_mutex_lock(&lvm_lock);
- ret = refresh_toolcontext(cmd);
+ if (!refresh_toolcontext(cmd))
+ return -1;
+
init_full_scan_done(0);
lvmcache_label_scan(cmd, 2);
dm_pool_empty(cmd->mem);
pthread_mutex_unlock(&lvm_lock);
- return ret==1?0:-1;
+ return 0;
}
--
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