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valgrind 리포트 결과 보았는데.. 디버깅이 어렵네요 도움좀 부탁드려요 ㅠㅠ

fivestar의 이미지
글쓴이: fivestar / 작성시간: 화, 2011/08/16 - 4:14오후

프로그램에 메모리릭이 발생하여 valgrind를 사용하여 체크하였습니다.

아래가 리포트 결과 이며 오류발생하는 함수 체크해보았는데 아무런 증상이 없네요..

아래 리포트 결과를 정확히 어떻게 받아들여야하며.. 어느부분을 체크해봐야 하는지.. 도움좀주세요

==32210== ERROR SUMMARY: 52 errors from 12 contexts (suppressed: 79 from 2)
==32210== malloc/free: in use at exit: 17,334,259 bytes in 11,577 blocks.
==32210== malloc/free: 36,418 allocs, 24,841 frees, 21,007,692 bytes allocated.
==32210== For counts of detected errors, rerun with: -v
==32210== searching for pointers to 11,577 not-freed blocks.
==32210== checked 193,879,836 bytes.
==32210==
==32210==
==32210== 12 bytes in 1 blocks are still reachable in loss record 1 of 22
==32210== at 0x4023D6E: malloc (vg_replace_malloc.c:207)
==32210== by 0x804F314: ntt_create (ntt.c:76)
==32210== by 0x804C681: healthcheck_init (hcheck_manager.c:51)
==32210== by 0x804FAA6: main (main.c:125)
==32210==
==32210==
==32210== 20 bytes in 1 blocks are still reachable in loss record 2 of 22
==32210== at 0x4023D6E: malloc (vg_replace_malloc.c:207)
==32210== by 0x804F27A: ntt_node_create (ntt.c:54)
==32210== by 0x804F550: ntt_insert (ntt.c:165)
==32210== by 0x804CB3D: add_client (hcheck_manager.c:167)
==32210== by 0x805101D: chk_protocol (main.c:675)
==32210== by 0x80500DE: established_proc (main.c:278)
==32210== by 0x804FDFD: running_server (main.c:220)
==32210== by 0x804FC3C: main (main.c:173)
==32210==
==32210==
==32210== 28 bytes in 1 blocks are still reachable in loss record 3 of 22
==32210== at 0x4023D6E: malloc (vg_replace_malloc.c:207)
==32210== by 0x8049635: db_pool_callback_init (db_manager.c:56)
==32210== by 0x80495B2: db_pool_init (db_manager.c:77)
==32210== by 0x804954E: initialize_db (db_manager.c:32)
==32210== by 0x804F9CC: main (main.c:100)
==32210==
==32210==
==32210== 156 (36 direct, 120 indirect) bytes in 1 blocks are definitely lost in loss record 4 of 22
==32210== at 0x4023D6E: malloc (vg_replace_malloc.c:207)
==32210== by 0x4120713: (within /lib/libc-2.7.so)
==32210== by 0x4120E73: __nss_database_lookup (in /lib/libc-2.7.so)
==32210== by 0x7A0BF4B: ???
==32210== by 0x7A0CCEC: ???
==32210== by 0x40DA281: getpwuid_r (in /lib/libc-2.7.so)
==32210== by 0x4041D3D: (within /usr/lib/libpq.so.5.1)
==32210== by 0x402C819: (within /usr/lib/libpq.so.5.1)
==32210== by 0x403107E: (within /usr/lib/libpq.so.5.1)
==32210== by 0x4031108: (within /usr/lib/libpq.so.5.1)
==32210== by 0x40319B4: PQsetdbLogin (in /usr/lib/libpq.so.5.1)
==32210== by 0x80497D9: db_pool_pgsql_alloc (db_manager.c:114)
==32210==
==32210==
==32210== 40 bytes in 5 blocks are indirectly lost in loss record 5 of 22
==32210== at 0x4023D6E: malloc (vg_replace_malloc.c:207)
==32210== by 0x41202AB: __nss_lookup_function (in /lib/libc-2.7.so)
==32210== by 0x7A0BF6B: ???
==32210== by 0x7A0CCEC: ???
==32210== by 0x40DA281: getpwuid_r (in /lib/libc-2.7.so)
==32210== by 0x4041D3D: (within /usr/lib/libpq.so.5.1)
==32210== by 0x402C819: (within /usr/lib/libpq.so.5.1)
==32210== by 0x403107E: (within /usr/lib/libpq.so.5.1)
==32210== by 0x4031108: (within /usr/lib/libpq.so.5.1)
==32210== by 0x40319B4: PQsetdbLogin (in /usr/lib/libpq.so.5.1)
==32210== by 0x80497D9: db_pool_pgsql_alloc (db_manager.c:114)
==32210== by 0x80495F7: db_pool_init (db_manager.c:82)
==32210==
==32210==
==32210== 64 bytes in 1 blocks are still reachable in loss record 6 of 22
==32210== at 0x4023D6E: malloc (vg_replace_malloc.c:207)
==32210== by 0x804D665: notice_check_init (notice_manager.c:33)
==32210== by 0x804FAE3: main (main.c:133)
==32210==
==32210==
==32210== 80 bytes in 5 blocks are indirectly lost in loss record 7 of 22
==32210== at 0x4023D6E: malloc (vg_replace_malloc.c:207)
==32210== by 0x410F5D0: tsearch (in /lib/libc-2.7.so)
==32210== by 0x412026D: __nss_lookup_function (in /lib/libc-2.7.so)
==32210== by 0x7A0BF6B: ???
==32210== by 0x7A0CCEC: ???
==32210== by 0x40DA281: getpwuid_r (in /lib/libc-2.7.so)
==32210== by 0x4041D3D: (within /usr/lib/libpq.so.5.1)
==32210== by 0x402C819: (within /usr/lib/libpq.so.5.1)
==32210== by 0x403107E: (within /usr/lib/libpq.so.5.1)
==32210== by 0x4031108: (within /usr/lib/libpq.so.5.1)
==32210== by 0x40319B4: PQsetdbLogin (in /usr/lib/libpq.so.5.1)
==32210== by 0x80497D9: db_pool_pgsql_alloc (db_manager.c:114)
==32210==
==32210==
==32210== 106 bytes in 1 blocks are still reachable in loss record 8 of 22
==32210== at 0x4023D6E: malloc (vg_replace_malloc.c:207)
==32210== by 0x804CBCE: add_client (hcheck_manager.c:175)
==32210== by 0x805101D: chk_protocol (main.c:675)
==32210== by 0x80500DE: established_proc (main.c:278)
==32210== by 0x804FDFD: running_server (main.c:220)
==32210== by 0x804FC3C: main (main.c:173)
==32210==
==32210==
==32210== 440 bytes in 1 blocks are still reachable in loss record 9 of 22
==32210== at 0x4023D6E: malloc (vg_replace_malloc.c:207)
==32210== by 0x804C14D: tm_init (thread_manager.c:31)
==32210== by 0x804F946: main (main.c:84)
==32210==
==32210==
==32210== 500 bytes in 500 blocks are still reachable in loss record 10 of 22
==32210== at 0x4021E22: calloc (vg_replace_malloc.c:397)
==32210== by 0x4031823: (within /usr/lib/libpq.so.5.1)
==32210== by 0x4031997: PQsetdbLogin (in /usr/lib/libpq.so.5.1)
==32210== by 0x80497D9: db_pool_pgsql_alloc (db_manager.c:114)
==32210== by 0x80495F7: db_pool_init (db_manager.c:82)
==32210== by 0x804954E: initialize_db (db_manager.c:32)
==32210== by 0x804F9CC: main (main.c:100)
==32210==
==32210==
==32210== 3,168 bytes in 22 blocks are possibly lost in loss record 11 of 22
==32210== at 0x4021E22: calloc (vg_replace_malloc.c:397)
==32210== by 0x4010C7B: _dl_allocate_tls (in /lib/ld-2.7.so)
==32210== by 0x418A5A7: pthread_create@@GLIBC_2.1 (in /lib/libpthread-2.7.so)
==32210== by 0x804C215: tm_init (thread_manager.c:44)
==32210== by 0x804F946: main (main.c:84)
==32210==
==32210==
==32210== 20,000 bytes in 1 blocks are still reachable in loss record 12 of 22
==32210== at 0x4023D6E: malloc (vg_replace_malloc.c:207)
==32210== by 0x80495A8: db_pool_init (db_manager.c:75)
==32210== by 0x804954E: initialize_db (db_manager.c:32)
==32210== by 0x804F9CC: main (main.c:100)
==32210==
==32210==
==32210== 21,776 (1,296 direct, 20,480 indirect) bytes in 9 blocks are definitely lost in loss record 13 of 22
==32210== at 0x4023D6E: malloc (vg_replace_malloc.c:207)
==32210== by 0x4033DD8: PQmakeEmptyPGresult (in /usr/lib/libpq.so.5.1)
==32210== by 0x403D412: (within /usr/lib/libpq.so.5.1)
==32210== by 0x4032E17: (within /usr/lib/libpq.so.5.1)
==32210== by 0x4034A80: PQgetResult (in /usr/lib/libpq.so.5.1)
==32210== by 0x4034C92: (within /usr/lib/libpq.so.5.1)
==32210== by 0x8049BD4: db_pgsql_select (db_manager.c:227)
==32210== by 0x804B529: auth_check (client_manager.c:497)
==32210== by 0x805097C: con_protocol (main.c:470)
==32210== by 0x805026A: established_proc (main.c:309)
==32210== by 0x804FDFD: running_server (main.c:220)
==32210== by 0x804FC3C: main (main.c:173)
==32210==
==32210==
==32210== 2,048 bytes in 4 blocks are indirectly lost in loss record 14 of 22
==32210== at 0x4023D6E: malloc (vg_replace_malloc.c:207)
==32210== by 0x4031DE7: (within /usr/lib/libpq.so.5.1)
==32210== by 0x403D523: (within /usr/lib/libpq.so.5.1)
==32210== by 0x4032E17: (within /usr/lib/libpq.so.5.1)
==32210== by 0x4034A80: PQgetResult (in /usr/lib/libpq.so.5.1)
==32210== by 0x4034C92: (within /usr/lib/libpq.so.5.1)
==32210== by 0x8049BD4: db_pgsql_select (db_manager.c:227)
==32210== by 0x804B529: auth_check (client_manager.c:497)
==32210== by 0x805097C: con_protocol (main.c:470)
==32210== by 0x805026A: established_proc (main.c:309)
==32210== by 0x804FDFD: running_server (main.c:220)
==32210== by 0x804FC3C: main (main.c:173)
==32210==
==32210==
==32210== 18,432 bytes in 9 blocks are indirectly lost in loss record 15 of 22
==32210== at 0x4023D6E: malloc (vg_replace_malloc.c:207)
==32210== by 0x4031CEB: (within /usr/lib/libpq.so.5.1)
==32210== by 0x403CF37: (within /usr/lib/libpq.so.5.1)
==32210== by 0x4032E17: (within /usr/lib/libpq.so.5.1)
==32210== by 0x4034A80: PQgetResult (in /usr/lib/libpq.so.5.1)
==32210== by 0x4034C92: (within /usr/lib/libpq.so.5.1)
==32210== by 0x8049BD4: db_pgsql_select (db_manager.c:227)
==32210== by 0x804B529: auth_check (client_manager.c:497)
==32210== by 0x805097C: con_protocol (main.c:470)
==32210== by 0x805026A: established_proc (main.c:309)
==32210== by 0x804FDFD: running_server (main.c:220)
==32210== by 0x804FC3C: main (main.c:173)
==32210==
==32210==
==32210== 27,333 bytes in 4,014 blocks are still reachable in loss record 16 of 22
==32210== at 0x4023D6E: malloc (vg_replace_malloc.c:207)
==32210== by 0x40B745F: strdup (in /lib/libc-2.7.so)
==32210== by 0x403118A: (within /usr/lib/libpq.so.5.1)
==32210== by 0x40319B4: PQsetdbLogin (in /usr/lib/libpq.so.5.1)
==32210== by 0x80497D9: db_pool_pgsql_alloc (db_manager.c:114)
==32210== by 0x80495F7: db_pool_init (db_manager.c:82)
==32210== by 0x804954E: initialize_db (db_manager.c:32)
==32210== by 0x804F9CC: main (main.c:100)
==32210==
==32210==
==32210== 49,156 bytes in 1 blocks are still reachable in loss record 17 of 22
==32210== at 0x4021E22: calloc (vg_replace_malloc.c:397)
==32210== by 0x804F36B: ntt_create (ntt.c:87)
==32210== by 0x804C681: healthcheck_init (hcheck_manager.c:51)
==32210== by 0x804FAA6: main (main.c:125)
==32210==
==32210==
==32210== 149,500 bytes in 4,500 blocks are still reachable in loss record 18 of 22
==32210== at 0x4023D6E: malloc (vg_replace_malloc.c:207)
==32210== by 0x4034007: (within /usr/lib/libpq.so.5.1)
==32210== by 0x403B0FB: (within /usr/lib/libpq.so.5.1)
==32210== by 0x403CBAC: (within /usr/lib/libpq.so.5.1)
==32210== by 0x4032E17: (within /usr/lib/libpq.so.5.1)
==32210== by 0x4033066: PQisBusy (in /usr/lib/libpq.so.5.1)
==32210== by 0x402E7A2: PQconnectPoll (in /usr/lib/libpq.so.5.1)
==32210== by 0x402F85F: (within /usr/lib/libpq.so.5.1)
==32210== by 0x4031A10: PQsetdbLogin (in /usr/lib/libpq.so.5.1)
==32210== by 0x80497D9: db_pool_pgsql_alloc (db_manager.c:114)
==32210== by 0x80495F7: db_pool_init (db_manager.c:82)
==32210== by 0x804954E: initialize_db (db_manager.c:32)
==32210==
==32210==
==32210== 256,000 bytes in 1,000 blocks are still reachable in loss record 19 of 22
==32210== at 0x4023D6E: malloc (vg_replace_malloc.c:207)
==32210== by 0x403D905: initPQExpBuffer (in /usr/lib/libpq.so.5.1)
==32210== by 0x402F9F2: (within /usr/lib/libpq.so.5.1)
==32210== by 0x403184B: PQsetdbLogin (in /usr/lib/libpq.so.5.1)
==32210== by 0x80497D9: db_pool_pgsql_alloc (db_manager.c:114)
==32210== by 0x80495F7: db_pool_init (db_manager.c:82)
==32210== by 0x804954E: initialize_db (db_manager.c:32)
==32210== by 0x804F9CC: main (main.c:100)
==32210==
==32210==
==32210== 422,000 bytes in 500 blocks are still reachable in loss record 20 of 22
==32210== at 0x4023D6E: malloc (vg_replace_malloc.c:207)
==32210== by 0x402F910: (within /usr/lib/libpq.so.5.1)
==32210== by 0x403184B: PQsetdbLogin (in /usr/lib/libpq.so.5.1)
==32210== by 0x80497D9: db_pool_pgsql_alloc (db_manager.c:114)
==32210== by 0x80495F7: db_pool_init (db_manager.c:82)
==32210== by 0x804954E: initialize_db (db_manager.c:32)
==32210== by 0x804F9CC: main (main.c:100)
==32210==
==32210==
==32210== 8,192,000 bytes in 500 blocks are still reachable in loss record 21 of 22
==32210== at 0x4023D6E: malloc (vg_replace_malloc.c:207)
==32210== by 0x402F9DE: (within /usr/lib/libpq.so.5.1)
==32210== by 0x403184B: PQsetdbLogin (in /usr/lib/libpq.so.5.1)
==32210== by 0x80497D9: db_pool_pgsql_alloc (db_manager.c:114)
==32210== by 0x80495F7: db_pool_init (db_manager.c:82)
==32210== by 0x804954E: initialize_db (db_manager.c:32)
==32210== by 0x804F9CC: main (main.c:100)
==32210==
==32210==
==32210== 8,192,000 bytes in 500 blocks are still reachable in loss record 22 of 22
==32210== at 0x4023D6E: malloc (vg_replace_malloc.c:207)
==32210== by 0x402F9C2: (within /usr/lib/libpq.so.5.1)
==32210== by 0x403184B: PQsetdbLogin (in /usr/lib/libpq.so.5.1)
==32210== by 0x80497D9: db_pool_pgsql_alloc (db_manager.c:114)
==32210== by 0x80495F7: db_pool_init (db_manager.c:82)
==32210== by 0x804954E: initialize_db (db_manager.c:32)
==32210== by 0x804F9CC: main (main.c:100)
==32210==
==32210== LEAK SUMMARY:
==32210== definitely lost: 1,332 bytes in 10 blocks.
==32210== indirectly lost: 20,600 bytes in 23 blocks.
==32210== possibly lost: 3,168 bytes in 22 blocks.
==32210== still reachable: 17,309,159 bytes in 11,522 blocks.
==32210== suppressed: 0 bytes in 0 blocks.

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프로그래밍 QnA
익명 사용자의 이미지

글쓴이: 익명 사용자 / 작성시간: 화, 2011/08/16 - 7:06오후

모두 메모리릭 관련된 오류이네요.

"... blocks are still reachable ... " 은 할당받은 메모리를 프로그램이 끝날 때가지 해지하지 않았다는 말입니다.
코드의 어느 라인에서 할당받은 메모리인지는 by 로 시작하는 라인들을 보시면 나와있습니다.
연속된 by 는 "~ 에 의해 호출된" 이라고 해석하시면 됩니다.

"...blocks are indirectly lost ..." 은 할당받은 메모리를 해지하지 않고, 그 메모리를 가리키는 포인터의 값을 바꾸었다는 뜻입니다.
고로 그 메모리를 해지할 방법이 없어진겁니다.
그런 메모리 영역이 계속 쌓여가면 사용하지 않는 메모리를 재활용할 수 없으니 쓸데없이 메모리를 모두 써버릴 수도 있습니다.

익명 사용자의 이미지

글쓴이: 익명 사용자 / 작성시간: 화, 2011/08/16 - 7:13오후

"...blocks are definitely lost ..." 역시 "...blocks are indirectly lost ..." 와 비슷합니다.
그리고 메모리 릭이 발생하는 경우는 할당받은 메모리를 해지하지 않고, 그 메모리를 가리키는 포인터의 값을 바꾸는 경우 말고도
지역 변수 포인터가 스코프를 벗어나서 사라지는 경우도 있습니다.

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  • 다음 태그를 이용하여 소스 코드 구문 강조를 할 수 있습니다: <code>, <blockcode>, <apache>, <applescript>, <autoconf>, <awk>, <bash>, <c>, <cpp>, <css>, <diff>, <drupal5>, <drupal6>, <gdb>, <html>, <html5>, <java>, <javascript>, <ldif>, <lua>, <make>, <mysql>, <perl>, <perl6>, <php>, <pgsql>, <proftpd>, <python>, <reg>, <spec>, <ruby>. 지원하는 태그 형식: <foo>, [foo].
  • Quick Tips:
    • Two or more spaces at a line's end = Line break
    • Double returns = Paragraph
    • *Single asterisks* or _single underscores_ = Emphasis
    • **Double** or __double__ = Strong
    • This is [a link](http://the.link.example.com "The optional title text")
    For complete details on the Markdown syntax, see the Markdown documentation and Markdown Extra documentation for tables, footnotes, and more.
  • web 주소와/이메일 주소를 클릭할 수 있는 링크로 자동으로 바꿉니다.
  • 사용할 수 있는 HTML 태그: <p><div><span><br><a><em><strong><del><ins><b><i><u><s><pre><code><cite><blockquote><ul><ol><li><dl><dt><dd><table><tr><td><th><thead><tbody><h1><h2><h3><h4><h5><h6><img><embed><object><param><hr>

Plain text

  • HTML 태그를 사용할 수 없습니다.
  • web 주소와/이메일 주소를 클릭할 수 있는 링크로 자동으로 바꿉니다.
  • 줄과 단락은 자동으로 분리됩니다.
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