page-ctl cannot work when there is an unresolved page ref

[breezewish]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

Use write batch to write a page ref that cannot be resolved into PSv3, and then use PageCtl to observe it:

./page-ctl --page_storage_version 3 --paths ../../data/page/meta

2. What did you expect to see? (Required)

PageCtl is able to decode everything and let me observe how invalid ref comes from.

3. What did you see instead (Required)

PageCtl crashed without any readable message:

[1]    28874 abort (core dumped)  LD_LIBRARY_PATH=$(pwd) ./page-ctl --page_storage_version 3 --path

When attached a debugger:

Program received signal SIGABRT, Aborted.
0x00007ffff3837387 in raise () from /lib64/libc.so.6
(gdb) bt
#0  0x00007ffff3837387 in raise () from /lib64/libc.so.6
#1  0x00007ffff3838a78 in abort () from /lib64/libc.so.6
#2  0x0000000000cdb84e in DB::PS::V3::PageStorageControlV3::run (this=<optimized out>, this@entry=0x7fffffffdf40)
    at /root/wenxuan/tiflash/dbms/src/Storages/Page/tools/PageCtl/PageStorageCtlV3.cpp:153
#3  0x0000000000cdace7 in pageStorageV3CtlEntry (argc=<optimized out>, argc@entry=3, argv=<optimized out>, argv@entry=0x7fffffffe258)
    at /root/wenxuan/tiflash/dbms/src/Storages/Page/tools/PageCtl/PageStorageCtlV3.cpp:522
#4  0x0000000000cd488f in DB::PageStorageCtl::mainEntry (argc=<optimized out>, argv=<optimized out>)
    at /root/wenxuan/tiflash/dbms/src/Storages/Page/tools/PageCtl/MainEntry.cpp:48
#5  0x00007ffff3823555 in __libc_start_main () from /lib64/libc.so.6
#6  0x0000000000cd43e9 in _start () at ../sysdeps/x86_64/start.S:123

4. What is your TiFlash version? (Required)

master