[Jack-Devel] [Fwd: strange valgrind results for client initialization and shutdown]

Thomas Brand tom at trellis.ch
Thu Jan 12 23:51:12 CET 2017
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Hi list,

i have recently started to play with valgrind and for yet unknown reasons
i get a lot of "Syscall param write(buf) points to uninitialised byte(s)"
even for a simple program like this:

#include <jack/jack.h>
int main()
{
	const char *name="test";
	jack_client_t *client;
	jack_options_t options=JackNoStartServer;
	jack_status_t status;
	client=jack_client_open(name,options,&status);
	jack_client_close(client);
	return 0;
}

//gcc -o test test.c -ljack
//valgrind --leak-check=full --show-leak-kinds=all --track-origins=yes -v
./test

Is there anything missing in the code example?
Should i worry about the errors shown by valgrind (in that case 10 errors
from 6 contexts) at all?

Thanks for your suggestions.
Thomas

------
amend:

sorry that was too quick, it's 2 errors in 2 contexts. The above applies
to jack_simple_client.

I hope it's convenient to paste output here, so here is the output for
test.c:

==11355== Memcheck, a memory error detector
==11355== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==11355== Using Valgrind-3.10.1 and LibVEX; rerun with -h for copyright info
==11355== Command: ./test
==11355==
--11355-- Valgrind options:
--11355--    --leak-check=full
--11355--    --show-leak-kinds=all
--11355--    --track-origins=yes
--11355--    -v
--11355-- Contents of /proc/version:
--11355--   Linux version 3.13.0-88-lowlatency (buildd at lgw01-16) (gcc
version 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04.3) ) #135-Ubuntu SMP PREEMPT
Wed Jun 8 22:20:04 UTC 2016
--11355-- Arch and hwcaps: AMD64, LittleEndian, amd64-cx16-rdtscp-sse3
--11355-- Page sizes: currently 4096, max supported 4096
--11355-- Valgrind library directory: /usr/lib/valgrind
--11355-- Reading syms from /tmp/test
--11355-- Reading syms from /lib/x86_64-linux-gnu/ld-2.19.so
--11355--   Considering /lib/x86_64-linux-gnu/ld-2.19.so ..
--11355--   .. CRC mismatch (computed 46abf574 wanted 3ca2d3ca)
--11355--   Considering /usr/lib/debug/lib/x86_64-linux-gnu/ld-2.19.so ..
--11355--   .. CRC is valid
--11355-- Reading syms from /usr/lib/valgrind/memcheck-amd64-linux
--11355--   Considering /usr/lib/valgrind/memcheck-amd64-linux ..
--11355--   .. CRC mismatch (computed 4f1eed43 wanted a323a3ab)
--11355--    object doesn't have a symbol table
--11355--    object doesn't have a dynamic symbol table
--11355-- Scheduler: using generic scheduler lock implementation.
--11355-- Reading suppressions file: /usr/lib/valgrind/default.supp
==11355== embedded gdbserver: reading from
/tmp/vgdb-pipe-from-vgdb-to-11355-by-srv-on-???
==11355== embedded gdbserver: writing to  
/tmp/vgdb-pipe-to-vgdb-from-11355-by-srv-on-???
==11355== embedded gdbserver: shared mem  
/tmp/vgdb-pipe-shared-mem-vgdb-11355-by-srv-on-???
==11355==
==11355== TO CONTROL THIS PROCESS USING vgdb (which you probably
==11355== don't want to do, unless you know exactly what you're doing,
==11355== or are doing some strange experiment):
==11355==   /usr/lib/valgrind/../../bin/vgdb --pid=11355 ...command...
==11355==
==11355== TO DEBUG THIS PROCESS USING GDB: start GDB like this
==11355==   /path/to/gdb ./test
==11355== and then give GDB the following command
==11355==   target remote | /usr/lib/valgrind/../../bin/vgdb --pid=11355
==11355== --pid is optional if only one valgrind process is running
==11355==
--11355-- REDIR: 0x4019c50 (ld-linux-x86-64.so.2:strlen) redirected to
0x380764b1 (???)
--11355-- Reading syms from /usr/lib/valgrind/vgpreload_core-amd64-linux.so
--11355--   Considering /usr/lib/valgrind/vgpreload_core-amd64-linux.so ..
--11355--   .. CRC mismatch (computed fc68135e wanted 45f5e986)
--11355--    object doesn't have a symbol table
--11355-- Reading syms from
/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so
--11355--   Considering
/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so ..
--11355--   .. CRC mismatch (computed ae683f7e wanted 08c06df2)
--11355--    object doesn't have a symbol table
==11355== WARNING: new redirection conflicts with existing -- ignoring it
--11355--     old: 0x04019c50 (strlen              ) R-> (0000.0)
0x380764b1 ???
--11355--     new: 0x04019c50 (strlen              ) R-> (2007.0)
0x04c2e1a0 strlen
--11355-- REDIR: 0x4019a00 (ld-linux-x86-64.so.2:index) redirected to
0x4c2dd50 (index)
--11355-- REDIR: 0x4019c20 (ld-linux-x86-64.so.2:strcmp) redirected to
0x4c2f2f0 (strcmp)
--11355-- REDIR: 0x401a970 (ld-linux-x86-64.so.2:mempcpy) redirected to
0x4c31da0 (mempcpy)
--11355-- Reading syms from /usr/local/lib/libjack.so.0.1.0
--11355-- Reading syms from /lib/x86_64-linux-gnu/libc-2.19.so
--11355--   Considering /lib/x86_64-linux-gnu/libc-2.19.so ..
--11355--   .. CRC mismatch (computed ac9b5ddb wanted a10d05bf)
--11355--   Considering /usr/lib/debug/lib/x86_64-linux-gnu/libc-2.19.so ..
--11355--   .. CRC is valid
--11355-- Reading syms from /lib/x86_64-linux-gnu/libpthread-2.19.so
--11355--   Considering /lib/x86_64-linux-gnu/libpthread-2.19.so ..
--11355--   .. CRC mismatch (computed 88040ace wanted 71b58165)
--11355--   Considering
/usr/lib/debug/lib/x86_64-linux-gnu/libpthread-2.19.so ..
--11355--   .. CRC is valid
--11355-- Reading syms from /lib/x86_64-linux-gnu/librt-2.19.so
--11355--   Considering /lib/x86_64-linux-gnu/librt-2.19.so ..
--11355--   .. CRC mismatch (computed 9efd3dd5 wanted ae0f290f)
--11355--   Considering /usr/lib/debug/lib/x86_64-linux-gnu/librt-2.19.so ..
--11355--   .. CRC is valid
--11355-- Reading syms from /lib/x86_64-linux-gnu/libdl-2.19.so
--11355--   Considering /lib/x86_64-linux-gnu/libdl-2.19.so ..
--11355--   .. CRC mismatch (computed 5e07a82d wanted c608f377)
--11355--   Considering /usr/lib/debug/lib/x86_64-linux-gnu/libdl-2.19.so ..
--11355--   .. CRC is valid
--11355-- Reading syms from /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19
--11355--   Considering /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19 ..
--11355--   .. CRC mismatch (computed dc37bb90 wanted ea8c3b40)
--11355--    object doesn't have a symbol table
--11355-- Reading syms from /lib/x86_64-linux-gnu/libm-2.19.so
--11355--   Considering /lib/x86_64-linux-gnu/libm-2.19.so ..
--11355--   .. CRC mismatch (computed 08659659 wanted 7ce1b39a)
--11355--   Considering /usr/lib/debug/lib/x86_64-linux-gnu/libm-2.19.so ..
--11355--   .. CRC is valid
--11355-- Reading syms from /lib/x86_64-linux-gnu/libgcc_s.so.1
--11355--   Considering /lib/x86_64-linux-gnu/libgcc_s.so.1 ..
--11355--   .. CRC mismatch (computed 6116126e wanted 54e3f1f2)
--11355--    object doesn't have a symbol table
--11355-- REDIR: 0x511cc50 (libc.so.6:strcasecmp) redirected to 0x4a25720
(_vgnU_ifunc_wrapper)
--11355-- REDIR: 0x511ef40 (libc.so.6:strncasecmp) redirected to 0x4a25720
(_vgnU_ifunc_wrapper)
--11355-- REDIR: 0x511c420 (libc.so.6:memcpy at GLIBC_2.2.5) redirected to
0x4a25720 (_vgnU_ifunc_wrapper)
--11355-- REDIR: 0x511a6b0 (libc.so.6:rindex) redirected to 0x4c2da30
(rindex)
--11355-- REDIR: 0x51189b0 (libc.so.6:strlen) redirected to 0x4c2e0e0
(strlen)
--11355-- REDIR: 0x511be90 (libc.so.6:__GI_memcmp) redirected to 0x4c30b80
(__GI_memcmp)
--11355-- REDIR: 0x5116f60 (libc.so.6:strcmp) redirected to 0x4a25720
(_vgnU_ifunc_wrapper)
--11355-- REDIR: 0x5127c10 (libc.so.6:__strcmp_sse2_unaligned) redirected
to 0x4c2f1b0 (strcmp)
--11355-- REDIR: 0x5addd90 (libstdc++.so.6:operator new(unsigned long))
redirected to 0x4c2b070 (operator new(unsigned long))
--11355-- REDIR: 0x511c4b0 (libc.so.6:memset) redirected to 0x4c31350
(memset)
--11355-- REDIR: 0x5113130 (libc.so.6:calloc) redirected to 0x4c2cbf0
(calloc)
--11355-- REDIR: 0x5112d00 (libc.so.6:free) redirected to 0x4c2bd80 (free)
--11355-- REDIR: 0x51239b0 (libc.so.6:strchrnul) redirected to 0x4c319b0
(strchrnul)
--11355-- REDIR: 0x5adc0f0 (libstdc++.so.6:operator delete(void*))
redirected to 0x4c2c250 (operator delete(void*))
--11355-- REDIR: 0x511a670 (libc.so.6:strncpy) redirected to 0x4a25720
(_vgnU_ifunc_wrapper)
--11355-- REDIR: 0x512d0b0 (libc.so.6:__strncpy_sse2_unaligned) redirected
to 0x4c2e770 (__strncpy_sse2_unaligned)
==11355== Syscall param write(buf) points to uninitialised byte(s)
==11355==    at 0x517B72D: ??? (syscall-template.S:81)
==11355==    by 0x4E6F131: Jack::JackClientSocket::Write(void*, int) (in
/usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4E5CA93:
Jack::JackClientCheckRequest::Write(Jack::detail::JackChannelTransactionInterface*)
(in /usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4E5A916:
Jack::JackGenericClientChannel::ServerSyncCall(Jack::JackRequest*,
Jack::JackResult*, int*) (in /usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4E5AB36:
Jack::JackGenericClientChannel::ClientCheck(char const*, int, char*, int,
int, int*, int*, int) (in /usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4E71F67: Jack::JackSocketClientChannel::Open(char
const*, char const*, int, char*, Jack::JackClient*, JackOptions,
JackStatus*) (in /usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4E6FFE3: Jack::JackLibClient::Open(char const*, char
const*, int, JackOptions, JackStatus*) (in
/usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4E71172: jack_client_open_aux(char const*, JackOptions,
JackStatus*, __va_list_tag*) (in /usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4E712FE: jack_client_open (in
/usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x40071D: main (in /tmp/test)
==11355==  Address 0xffefffb85 is on thread 1's stack
==11355==  in frame #4, created by
Jack::JackGenericClientChannel::ClientCheck(char const*, int, char*, int,
int, int*, int*, int) (???)
==11355==  Uninitialised value was created by a stack allocation
==11355==    at 0x4E5AA7E:
Jack::JackGenericClientChannel::ClientCheck(char const*, int, char*, int,
int, int*, int*, int) (in /usr/local/lib/libjack.so.0.1.0)
==11355==
--11355-- REDIR: 0x51183f0 (libc.so.6:strcpy) redirected to 0x4a25720
(_vgnU_ifunc_wrapper)
--11355-- REDIR: 0x512ca80 (libc.so.6:__strcpy_sse2_unaligned) redirected
to 0x4c2e1c0 (strcpy)
==11355== Syscall param write(buf) points to uninitialised byte(s)
==11355==    at 0x517B72D: ??? (syscall-template.S:81)
==11355==    by 0x4E6F131: Jack::JackClientSocket::Write(void*, int) (in
/usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4E5D07D:
Jack::JackClientOpenRequest::Write(Jack::detail::JackChannelTransactionInterface*)
(in /usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4E5A916:
Jack::JackGenericClientChannel::ServerSyncCall(Jack::JackRequest*,
Jack::JackResult*, int*) (in /usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4E5AC79: Jack::JackGenericClientChannel::ClientOpen(char
const*, int, int, int*, int*, int*, int*) (in
/usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4E7009D: Jack::JackLibClient::Open(char const*, char
const*, int, JackOptions, JackStatus*) (in
/usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4E71172: jack_client_open_aux(char const*, JackOptions,
JackStatus*, __va_list_tag*) (in /usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4E712FE: jack_client_open (in
/usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x40071D: main (in /tmp/test)
==11355==  Address 0xffefffbfd is on thread 1's stack
==11355==  in frame #4, created by
Jack::JackGenericClientChannel::ClientOpen(char const*, int, int, int*,
int*, int*, int*) (???)
==11355==  Uninitialised value was created by a stack allocation
==11355==    at 0x4E5ABD2: Jack::JackGenericClientChannel::ClientOpen(char
const*, int, int, int*, int*, int*, int*) (in
/usr/local/lib/libjack.so.0.1.0)
==11355==
--11355-- REDIR: 0x511c5b0 (libc.so.6:mempcpy) redirected to 0x4a25720
(_vgnU_ifunc_wrapper)
--11355-- REDIR: 0x51dd1c0 (libc.so.6:__mempcpy_ssse3_back) redirected to
0x4c31ad0 (mempcpy)
--11355-- REDIR: 0x5121620 (libc.so.6:memcpy@@GLIBC_2.14) redirected to
0x4a25720 (_vgnU_ifunc_wrapper)
--11355-- REDIR: 0x5127ec0 (libc.so.6:__memcpy_sse2_unaligned) redirected
to 0x4c2f6b0 (memcpy@@GLIBC_2.14)
--11355-- REDIR: 0x5112660 (libc.so.6:malloc) redirected to 0x4c2ab10
(malloc)
--11355-- REDIR: 0x5116d10 (libc.so.6:index) redirected to 0x4a25720
(_vgnU_ifunc_wrapper)
--11355-- REDIR: 0x5116d40 (libc.so.6:__GI_strchr) redirected to 0x4c2db90
(__GI_strchr)
==11355==
==11355== HEAP SUMMARY:
==11355==     in use at exit: 96 bytes in 2 blocks
==11355==   total heap usage: 18 allocs, 16 frees, 53,088 bytes allocated
==11355==
==11355== Searching for pointers to 2 not-freed blocks
==11355== Checked 307,624 bytes
==11355==
==11355== 48 bytes in 1 blocks are still reachable in loss record 1 of 2
==11355==    at 0x4C2B0E0: operator new(unsigned long) (in
/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==11355==    by 0x4E650AA: __static_initialization_and_destruction_0(int,
int) (in /usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4E6512C: _GLOBAL__sub_I_JackGlobals.cpp (in
/usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4010109: call_init.part.0 (dl-init.c:78)
==11355==    by 0x40101F2: call_init (dl-init.c:36)
==11355==    by 0x40101F2: _dl_init (dl-init.c:126)
==11355==    by 0x4001309: ??? (in /lib/x86_64-linux-gnu/ld-2.19.so)
==11355==
==11355== 48 bytes in 1 blocks are still reachable in loss record 2 of 2
==11355==    at 0x4C2B0E0: operator new(unsigned long) (in
/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==11355==    by 0x4E650CB: __static_initialization_and_destruction_0(int,
int) (in /usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4E6512C: _GLOBAL__sub_I_JackGlobals.cpp (in
/usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4010109: call_init.part.0 (dl-init.c:78)
==11355==    by 0x40101F2: call_init (dl-init.c:36)
==11355==    by 0x40101F2: _dl_init (dl-init.c:126)
==11355==    by 0x4001309: ??? (in /lib/x86_64-linux-gnu/ld-2.19.so)
==11355==
==11355== LEAK SUMMARY:
==11355==    definitely lost: 0 bytes in 0 blocks
==11355==    indirectly lost: 0 bytes in 0 blocks
==11355==      possibly lost: 0 bytes in 0 blocks
==11355==    still reachable: 96 bytes in 2 blocks
==11355==         suppressed: 0 bytes in 0 blocks
==11355==
==11355== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 0 from 0)
==11355==
==11355== 1 errors in context 1 of 2:
==11355== Syscall param write(buf) points to uninitialised byte(s)
==11355==    at 0x517B72D: ??? (syscall-template.S:81)
==11355==    by 0x4E6F131: Jack::JackClientSocket::Write(void*, int) (in
/usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4E5D07D:
Jack::JackClientOpenRequest::Write(Jack::detail::JackChannelTransactionInterface*)
(in /usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4E5A916:
Jack::JackGenericClientChannel::ServerSyncCall(Jack::JackRequest*,
Jack::JackResult*, int*) (in /usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4E5AC79: Jack::JackGenericClientChannel::ClientOpen(char
const*, int, int, int*, int*, int*, int*) (in
/usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4E7009D: Jack::JackLibClient::Open(char const*, char
const*, int, JackOptions, JackStatus*) (in
/usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4E71172: jack_client_open_aux(char const*, JackOptions,
JackStatus*, __va_list_tag*) (in /usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4E712FE: jack_client_open (in
/usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x40071D: main (in /tmp/test)
==11355==  Address 0xffefffbfd is on thread 1's stack
==11355==  in frame #4, created by
Jack::JackGenericClientChannel::ClientOpen(char const*, int, int, int*,
int*, int*, int*) (???)
==11355==  Uninitialised value was created by a stack allocation
==11355==    at 0x4E5ABD2: Jack::JackGenericClientChannel::ClientOpen(char
const*, int, int, int*, int*, int*, int*) (in
/usr/local/lib/libjack.so.0.1.0)
==11355==
==11355==
==11355== 1 errors in context 2 of 2:
==11355== Syscall param write(buf) points to uninitialised byte(s)
==11355==    at 0x517B72D: ??? (syscall-template.S:81)
==11355==    by 0x4E6F131: Jack::JackClientSocket::Write(void*, int) (in
/usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4E5CA93:
Jack::JackClientCheckRequest::Write(Jack::detail::JackChannelTransactionInterface*)
(in /usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4E5A916:
Jack::JackGenericClientChannel::ServerSyncCall(Jack::JackRequest*,
Jack::JackResult*, int*) (in /usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4E5AB36:
Jack::JackGenericClientChannel::ClientCheck(char const*, int, char*, int,
int, int*, int*, int) (in /usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4E71F67: Jack::JackSocketClientChannel::Open(char
const*, char const*, int, char*, Jack::JackClient*, JackOptions,
JackStatus*) (in /usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4E6FFE3: Jack::JackLibClient::Open(char const*, char
const*, int, JackOptions, JackStatus*) (in
/usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4E71172: jack_client_open_aux(char const*, JackOptions,
JackStatus*, __va_list_tag*) (in /usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x4E712FE: jack_client_open (in
/usr/local/lib/libjack.so.0.1.0)
==11355==    by 0x40071D: main (in /tmp/test)
==11355==  Address 0xffefffb85 is on thread 1's stack
==11355==  in frame #4, created by
Jack::JackGenericClientChannel::ClientCheck(char const*, int, char*, int,
int, int*, int*, int) (???)
==11355==  Uninitialised value was created by a stack allocation
==11355==    at 0x4E5AA7E:
Jack::JackGenericClientChannel::ClientCheck(char const*, int, char*, int,
int, int*, int*, int) (in /usr/local/lib/libjack.so.0.1.0)
==11355==
==11355== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 0 from 0)

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