Comment # 12 on bug 1043043 from zhen ren

The problem seems in thin-provisioning-tools:

(gdb) bt
#0  caching::check_superblock (sb=..., nr_metadata_blocks=2048, visitor=...) at
caching/superblock.cc:334
#1  0x00005555555a3719 in caching::check_superblock (bm=...,
nr_metadata_blocks=2048, visitor=...)
    at caching/superblock.cc:419
#2  0x0000555555572fb4 in (anonymous namespace)::metadata_check (fs=<synthetic
pointer>..., 
    path="/dev/mapper/testvg-cpool_cmeta", this=<optimized out>,
this=<optimized out>, this=<optimized out>, 
    this=<optimized out>, this=<optimized out>, this=<optimized out>) at
caching/cache_check.cc:237
#3  (anonymous namespace)::check (fs=<synthetic pointer>...,
path="/dev/mapper/testvg-cpool_cmeta")
    at caching/cache_check.cc:299
#4  (anonymous namespace)::check_with_exception_handling (fs=<synthetic
pointer>..., 
    path="/dev/mapper/testvg-cpool_cmeta") at caching/cache_check.cc:317
#5  caching::cache_check_cmd::run (this=0x5555558b4040, argc=<optimized out>,
argv=0x7fffffffe2e8)
    at caching/cache_check.cc:417
#6  0x00005555555693e8 in base::application::run (this=0x7fffffffe1d0, argc=4,
argv=0x7fffffffe2e8)
    at base/application.cc:66
#7  0x0000555555568907 in main (argc=4, argv=0x7fffffffe2e8) at main.cc:21

(gdb) 
353        if (sb.version >= VERSION_END) {
(gdb) 
354            ostringstream msg;
(gdb) n
355            msg << "version incorrect: " << sb.version;
(gdb) p sb.version
$3 = 2
(gdb) p sb.magic
$4 = 1623043
(gdb) p VERSION_END
$5 = 2