(gdb) bt
#0  0x0807918f in scanfunc_bno (ablock=0x405bd000, level=0, bno=338, agno=9, suspect=0, isroot=1) at scan.c:569
#1  0x0807760a in scan_sbtree (root=338, nlevels=1, agno=9, suspect=0, func=0x8078d05 <scanfunc_bno>, isroot=1) at scan.c:84
#2  0x0807b401 in scan_ag (agno=9) at swab.h:125
#3  0x0806570f in phase2 (mp=0xbfffdc70) at phase2.c:149
#4  0x0807c9e9 in main (argc=2, argv=0xbfffdc70) at xfs_repair.c:506