root@srvbsdfenssv:~ # gdb zpool
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This GDB was configured as "amd64-marcel-freebsd"...
(gdb) core zpool.core
Core was generated by `zpool status'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /lib/libgeom.so.5...Reading symbols from /usr/lib/debug//lib/libgeom.so.5.debug...done.
done.
Loaded symbols for /lib/libgeom.so.5
Reading symbols from /lib/libnvpair.so.2...Reading symbols from /usr/lib/debug//lib/libnvpair.so.2.debug...done.
done.
Loaded symbols for /lib/libnvpair.so.2
Reading symbols from /lib/libuutil.so.2...Reading symbols from /usr/lib/debug//lib/libuutil.so.2.debug...done.
done.
Loaded symbols for /lib/libuutil.so.2
Reading symbols from /lib/libzfs.so.2...Reading symbols from /usr/lib/debug//lib/libzfs.so.2.debug...done.
done.
Loaded symbols for /lib/libzfs.so.2
Reading symbols from /lib/libc.so.7...Reading symbols from /usr/lib/debug//lib/libc.so.7.debug...done.
done.
Loaded symbols for /lib/libc.so.7
Reading symbols from /lib/libbsdxml.so.4...Reading symbols from /usr/lib/debug//lib/libbsdxml.so.4.debug...done.
done.
Loaded symbols for /lib/libbsdxml.so.4
Reading symbols from /lib/libsbuf.so.6...Reading symbols from /usr/lib/debug//lib/libsbuf.so.6.debug...done.
done.
Loaded symbols for /lib/libsbuf.so.6
Reading symbols from /lib/libmd.so.6...Reading symbols from /usr/lib/debug//lib/libmd.so.6.debug...done.
done.
Loaded symbols for /lib/libmd.so.6
Reading symbols from /lib/libumem.so.2...Reading symbols from /usr/lib/debug//lib/libumem.so.2.debug...done.
done.
Loaded symbols for /lib/libumem.so.2
Reading symbols from /lib/libutil.so.9...Reading symbols from /usr/lib/debug//lib/libutil.so.9.debug...done.
done.
Loaded symbols for /lib/libutil.so.9
Reading symbols from /lib/libm.so.5...Reading symbols from /usr/lib/debug//lib/libm.so.5.debug...done.
done.
Loaded symbols for /lib/libm.so.5
Reading symbols from /lib/libavl.so.2...Reading symbols from /usr/lib/debug//lib/libavl.so.2.debug...done.
done.
Loaded symbols for /lib/libavl.so.2
Reading symbols from /lib/libz.so.6...Reading symbols from /usr/lib/debug//lib/libz.so.6.debug...done.
done.
Loaded symbols for /lib/libz.so.6
Reading symbols from /lib/libzfs_core.so.2...Reading symbols from /usr/lib/debug//lib/libzfs_core.so.2.debug...done.
done.
Loaded symbols for /lib/libzfs_core.so.2
Reading symbols from /lib/libthr.so.3...Reading symbols from /usr/lib/debug//lib/libthr.so.3.debug...done.
done.
Loaded symbols for /lib/libthr.so.3
Reading symbols from /libexec/ld-elf.so.1...Reading symbols from /usr/lib/debug//libexec/ld-elf.so.1.debug...done.
done.
Loaded symbols for /libexec/ld-elf.so.1
#0  avl_first (tree=0x28) at /usr/src/sys/cddl/contrib/opensolaris/common/avl/avl.c:187
187             size_t off = tree->avl_offset;
Current language:  auto; currently minimal
(gdb) bt
#0  avl_first (tree=0x28) at /usr/src/sys/cddl/contrib/opensolaris/common/avl/avl.c:187
#1  0x0000000800e8a806 in zpool_iter (hdl=0x802c42000, func=0x410920 <add_pool>, data=0x802c35020) at /usr/src/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_config.c:417
#2  0x00000000004108cb in pool_list_get (argc=0, argv=0x7fffffffec20, proplist=0x0, err=0x7fffffffd90c) at /usr/src/cddl/contrib/opensolaris/cmd/zpool/zpool_iter.c:128
#3  0x0000000000410bfd in for_each_pool (argc=<value optimized out>, argv=<value optimized out>, unavail=B_TRUE, proplist=<value optimized out>, func=0x406fd0 <status_callback>, data=0x7fffffffd950)
    at /usr/src/cddl/contrib/opensolaris/cmd/zpool/zpool_iter.c:246
#4  0x000000000040a4e3 in zpool_do_status (argc=0, argv=0x7fffffffec20) at /usr/src/cddl/contrib/opensolaris/cmd/zpool/zpool_main.c:5245
#5  0x0000000000408501 in main (argc=<value optimized out>, argv=0x7fffffffec10) at /usr/src/cddl/contrib/opensolaris/cmd/zpool/zpool_main.c:6338
#6  0x000000000040481d in _start ()
#7  0x000000080063e000 in ?? ()
#8  0x0000000000000000 in ?? ()
(gdb)