(gdb) bt
#0  0x00007f9fcedb7b4f in __log_has_hole (session=0x7f9fcf2aea70, fh=0x81ff80, 
    log_size=10485760, offset=128, error_offset=0x7ffe179e0210, 
    hole=0x7ffe179e01ee) at ../src/log/log.c:1908
#1  0x00007f9fcedb8f50 in __wt_log_scan (session=0x7f9fcf2aea70, lsnp=0x0, 
    flags=1, func=0x7f9fcee56c90 <__txn_printlog>, cookie=0x7ffe179e02f8)
    at ../src/log/log.c:2432
#2  0x00007f9fcee57491 in __wt_txn_printlog (wt_session=0x7f9fcf2aea70, 
    flags=0) at ../src/txn/txn_log.c:683
#3  0x0000000000409815 in util_printlog (session=0x7f9fcf2aea70, argc=0, 
    argv=0x7ffe179e0500) at ../src/utilities/util_printlog.c:43
#4  0x0000000000408dc4 in main (argc=1, argv=0x7ffe179e0500)
    at ../src/utilities/util_main.c:298
(gdb) frame 0
#0  0x00007f9fcedb7b4f in __log_has_hole (session=0x7f9fcf2aea70, fh=0x81ff80, 
    log_size=10485760, offset=128, error_offset=0x7ffe179e0210, 
    hole=0x7ffe179e01ee) at ../src/log/log.c:1908
1908					rdlen = WT_MIN(log->allocsize, buf_left);
(gdb) p log
$1 = (WT_LOG *) 0x0