문서유형ㅣ기술정보
분야ㅣ유틸리
적용제품버전ㅣ7FS02, 7FS02PS
문서번호ㅣTUTTI005
개요
tbsql에서 callstack 덤프를 수행할 수 없는 상황일 때, gdb을 통해 callstack을 확보하는 방법을 안내합니다.
참고gdb: 유닉스 기반 시스템에서 동작하는 이식성있는 디버거
아래 예시와 같이, TBCLI 로그 또는 pstack을 사용해 시점을 잡기 어려운 상황에서 적용 가능합니다.
$ tbsql sys/tibero
tbSQL 7
TmaxTibero Corporation Copyright (c) 2020-. All rights reserved.
TBR-2004: DSN (Database Source Name) file format is invalid.
at line 12, column 24:
)
^^^^^^
Driver can not be initialized.
DSN file is not found or corrupted.
방법
gdb의 --args 옵션을 사용해, 시점을 잡기 힘든 tibero client 도구의 callstack(backtrace) 정보를 확보할 수 있습니다.
$ gdb --args tbsql sys/tibero
... 중략 ...
(gdb) # tbsql 명령이 멈추어 있음
(gdb) run # tbsql 명령 수행
Starting program: /root/tibero7/client/bin/tbsql sys/tibero
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
tbSQL 7
TmaxTibero Corporation Copyright (c) 2020-. All rights reserved.
TBR-2004: DSN (Database Source Name) file format is invalid.
at line 12, column 24:
)
^^^^^^
Driver can not be initialized.
DSN file is not found or corrupted.
... 중지 ... # Ctrl + C를 통해 중지 수행
Program received signal SIGINT, Interrupt.
0x00007ffff3f00d45 in read () from /lib64/libc.so.6
Missing separate debuginfos, use: yum debuginfo-install glibc-2.28-236.el8_9.7.x86_64 libaio-0.3.105-2.x86_64 ncurses-compat-libs-6.1-10.20180224.el8.x86_64
(gdb) bt # backtrace 출력
#0 0x00007ffff3f00d45 in read () from /lib64/libc.so.6
#1 0x00007ffff3e73bf8 in __GI__IO_file_underflow () from /lib64/libc.so.6
#2 0x00007ffff3e74d56 in _IO_default_uflow () from /lib64/libc.so.6
#3 0x00007ffff3e685fa in _IO_getline_info () from /lib64/libc.so.6
#4 0x00007ffff3e675ff in fgets () from /lib64/libc.so.6
#5 0x00000000004116fa in tbsql_stdio_read (buf=buf@entry=0x6c6b40 "bt\n", buf_size=buf_size@entry=2048)
at /home/chef/workspace/Build_centos_7-3/tibero7/src/client/tbsql/tbsql_io.c:405
#6 0x00000000004117b4 in tbsql_io_read (buf=0x6c6b40 "bt\n", buf_size=2048,
prompt=0x6bf4fc <env_+28> "SQL> ")
at /home/chef/workspace/Build_centos_7-3/tibero7/src/client/tbsql/tbsql_io.c:66
#7 0x000000000040fe0a in tbsql_stmt_read_cmd (stmt=stmt@entry=0x7fffffffe1b0, fp=fp@entry=0x0,
lno=lno@entry=1, need_prompt=need_prompt@entry=1 '\001')
at /home/chef/workspace/Build_centos_7-3/tibero7/src/client/tbsql/tbsql_stmt.c:264
#8 0x0000000000410446 in tbsql_stmt_get_cmd (stmt=stmt@entry=0x7fffffffe1b0, fp=fp@entry=0x0)
at /home/chef/workspace/Build_centos_7-3/tibero7/src/client/tbsql/tbsql_stmt.c:303
#9 0x0000000000405bb3 in main (argc=<optimized out>, argv=<optimized out>)
at /home/chef/workspace/Build_centos_7-3/tibero7/src/client/tbsql/tbsql.c:70