Ubuntu

memory leak in pthread_exit()

Reported by Andrey on 2009-04-27
2
Affects Status Importance Assigned to Milestone
glibc (Ubuntu)
Undecided
Unassigned

Bug Description

Binary package hint: libc6

Valgrind reports a (reachable) memory leak when pthread_exit() is called.

Steps to Reproduce:

1. g++ -Wall pthread_exit.c -lpthread (see attachment)
2. valgrind --leak-check=full --show-reachable=yes -v ./a.out

Result:
==10272== Memcheck, a memory error detector.
==10272== Copyright (C) 2002-2007, and GNU GPL'd, by Julian Seward et al.
==10272== Using LibVEX rev 1804, a library for dynamic binary translation.
==10272== Copyright (C) 2004-2007, and GNU GPL'd, by OpenWorks LLP.
==10272== Using valgrind-3.3.0-Debian, a dynamic binary instrumentation framework.
==10272== Copyright (C) 2000-2007, and GNU GPL'd, by Julian Seward et al.
==10272==
--10272-- Command line
--10272-- ./a.out
--10272-- Startup, with flags:
--10272-- --leak-check=full
--10272-- --show-reachable=yes
--10272-- -v
--10272-- Contents of /proc/version:
--10272-- Linux version 2.6.24-16-generic (buildd@palmer) (gcc version 4.2.3 (Ubuntu 4.2.3-2ubuntu7)) #1 SMP Thu Apr 10 13:23:42 UTC 2008
--10272-- Arch and hwcaps: X86, x86-sse1-sse2
--10272-- Page sizes: currently 4096, max supported 4096
--10272-- Valgrind library directory: /usr/lib/valgrind
--10272-- Reading syms from /lib/ld-2.7.so (0x4000000)
--10272-- Reading debug info from /lib/ld-2.7.so...
--10272-- ... CRC mismatch (computed b93a03d2 wanted 46e85b4d)
--10272-- object doesn't have a symbol table
--10272-- Reading syms from /root/workfile/test_server/a.out (0x8048000)
--10272-- Reading syms from /usr/lib/valgrind/x86-linux/memcheck (0x38000000)
--10272-- object doesn't have a dynamic symbol table
--10272-- Reading suppressions file: /usr/lib/valgrind/default.supp
--10272-- Reading syms from /usr/lib/valgrind/x86-linux/vgpreload_core.so (0x401E000)
--10272-- Reading syms from /usr/lib/valgrind/x86-linux/vgpreload_memcheck.so (0x4020000)
--10272-- Reading syms from /lib/tls/i686/cmov/libpthread-2.7.so (0x403A000)
--10272-- Reading debug info from /lib/tls/i686/cmov/libpthread-2.7.so...
--10272-- ... CRC mismatch (computed ad1a7762 wanted effcce0a)
--10272-- Reading syms from /usr/lib/libstdc++.so.6.0.9 (0x4052000)
--10272-- Reading debug info from /usr/lib/libstdc++.so.6.0.9...
--10272-- ... CRC mismatch (computed e7a251ae wanted 89ddaef6)
--10272-- object doesn't have a symbol table
--10272-- Reading syms from /lib/tls/i686/cmov/libm-2.7.so (0x4146000)
--10272-- Reading debug info from /lib/tls/i686/cmov/libm-2.7.so...
--10272-- ... CRC mismatch (computed a35b3de9 wanted 4dd52e16)
--10272-- object doesn't have a symbol table
--10272-- Reading syms from /lib/libgcc_s.so.1 (0x416B000)
--10272-- Reading debug info from /lib/libgcc_s.so.1...
--10272-- ... CRC mismatch (computed d533060a wanted 94d3c196)
--10272-- object doesn't have a symbol table
--10272-- Reading syms from /lib/tls/i686/cmov/libc-2.7.so (0x4176000)
--10272-- Reading debug info from /lib/tls/i686/cmov/libc-2.7.so...
--10272-- ... CRC mismatch (computed 5861e7f6 wanted 741a7509)
--10272-- object doesn't have a symbol table
--10272-- REDIR: 0x41e94b0 (memset) redirected to 0x4023d50 (memset)
--10272-- REDIR: 0x41e99a0 (memcpy) redirected to 0x4024aa0 (memcpy)
--10272-- REDIR: 0x41e8620 (rindex) redirected to 0x4023710 (rindex)
--10272-- REDIR: 0x41e3930 (calloc) redirected to 0x4021b70 (calloc)
--10272-- REDIR: 0x41e3c20 (malloc) redirected to 0x4022a50 (malloc)
--10272-- REDIR: 0x41e8250 (strlen) redirected to 0x40239d0 (strlen)
--10272-- REDIR: 0x41e5460 (free) redirected to 0x40225f0 (free)
==10272==
==10272== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 19 from 1)
--10272--
--10272-- supp: 19 dl-hack3-1
==10272== malloc/free: in use at exit: 28 bytes in 1 blocks.
==10272== malloc/free: 2 allocs, 1 frees, 172 bytes allocated.
==10272==
==10272== searching for pointers to 1 not-freed blocks.
==10272== checked 125,832 bytes.
==10272==
==10272== 28 bytes in 1 blocks are still reachable in loss record 1 of 1
==10272== at 0x4022AB8: malloc (vg_replace_malloc.c:207)
==10272== by 0x400BF5F: (within /lib/ld-2.7.so)
==10272== by 0x40115A3: (within /lib/ld-2.7.so)
==10272== by 0x400D5D5: (within /lib/ld-2.7.so)
==10272== by 0x4010F5D: (within /lib/ld-2.7.so)
==10272== by 0x4284291: (within /lib/tls/i686/cmov/libc-2.7.so)
==10272== by 0x400D5D5: (within /lib/ld-2.7.so)
==10272== by 0x4284454: __libc_dlopen_mode (in /lib/tls/i686/cmov/libc-2.7.so)
==10272== by 0x4048686: pthread_cancel_init (in /lib/tls/i686/cmov/libpthread-2.7.so)
==10272== by 0x40487B0: _Unwind_ForcedUnwind (in /lib/tls/i686/cmov/libpthread-2.7.so)
==10272== by 0x4046210: __pthread_unwind (in /lib/tls/i686/cmov/libpthread-2.7.so)
==10272== by 0x40405EF: pthread_exit (in /lib/tls/i686/cmov/libpthread-2.7.so)
==10272==
==10272== LEAK SUMMARY:
==10272== definitely lost: 0 bytes in 0 blocks.
==10272== possibly lost: 0 bytes in 0 blocks.
==10272== still reachable: 28 bytes in 1 blocks.
==10272== suppressed: 0 bytes in 0 blocks.
--10272-- memcheck: sanity checks: 2 cheap, 2 expensive
--10272-- memcheck: auxmaps: 0 auxmap entries (0k, 0M) in use
--10272-- memcheck: auxmaps_L1: 0 searches, 0 cmps, ratio 0:10
--10272-- memcheck: auxmaps_L2: 0 searches, 0 nodes
--10272-- memcheck: SMs: n_issued = 14 (224k, 0M)
--10272-- memcheck: SMs: n_deissued = 0 (0k, 0M)
--10272-- memcheck: SMs: max_noaccess = 65535 (1048560k, 1023M)
--10272-- memcheck: SMs: max_undefined = 0 (0k, 0M)
--10272-- memcheck: SMs: max_defined = 163 (2608k, 2M)
--10272-- memcheck: SMs: max_non_DSM = 14 (224k, 0M)
--10272-- memcheck: max sec V bit nodes: 0 (0k, 0M)
--10272-- memcheck: set_sec_vbits8 calls: 0 (new: 0, updates: 0)
--10272-- memcheck: max shadow mem size: 528k, 0M
--10272-- translate: fast SP updates identified: 2,806 ( 90.6%)
--10272-- translate: generic_known SP updates identified: 172 ( 5.5%)
--10272-- translate: generic_unknown SP updates identified: 119 ( 3.8%)
--10272-- tt/tc: 5,258 tt lookups requiring 5,371 probes
--10272-- tt/tc: 5,258 fast-cache updates, 2 flushes
--10272-- transtab: new 2,620 (56,178 -> 816,520; ratio 145:10) [0 scs]
--10272-- transtab: dumped 0 (0 -> ??)
--10272-- transtab: discarded 0 (0 -> ??)
--10272-- scheduler: 240,599 jumps (bb entries).
--10272-- scheduler: 2/2,761 major/minor sched events.
--10272-- sanity: 3 cheap, 2 expensive checks.
--10272-- exectx: 769 lists, 9 contexts (avg 0 per list)
--10272-- exectx: 22 searches, 13 full compares (590 per 1000)
--10272-- exectx: 0 cmp2, 42 cmp4, 0 cmpAll
--10272-- errormgr: 7 supplist searches, 145 comparisons during search
--10272-- errormgr: 19 errlist searches, 42 comparisons during search

Andrey (fant) wrote :
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