John Reiser
17:27 (18 godzin temu)
> ==19124== at 0x40054EC: ??? (in /lib/ld-uClibc-0.9.33.2.so <
http://ld-uClib...
Kacper Kowalski <kacper.s.kowal...@gmail.com>
11:57 (1 minutę temu)
do John
Hi!
By default valgrind is not selectable in menuconfig for IMX6 platform when
cross compiling for Openwrt, but this platform is based on ARM Cortex A9
core which is implementing ARMv7 architecture. This architecture is
supported by valgrind, so I made little changes in Makefile of valgrind
package to make the package selectable from menuconfig and compilable.
I'm using GCC-5.3 and uClibc-0.9.33.2 (can't proceed to musl for now
because it is very expensive).
The problem is that valgrind is not working properly even for /bin/true:
> valgrind --leak-check=yes /bin/true
Output:
==19124== Memcheck, a memory error detector
==19124== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==19124== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==19124== Command: /bin/true
==19124==
==19124== Invalid read of size 4
==19124== at 0x40054EC: ??? (in /lib/ld-uClibc-0.9.33.2.so)
==19124== Address 0x7df01864 is on thread 1's stack
==19124== 20 bytes below stack pointer
==19124==
==19124== Invalid read of size 4
==19124== at 0x48B8CD4: ??? (in /lib/libuClibc-0.9.33.2.so)
==19124== Address 0x7df01a5c is on thread 1's stack
==19124== 20 bytes below stack pointer
==19124==
==19124== Invalid read of size 4
==19124== at 0x48B8AC0: ??? (in /lib/libuClibc-0.9.33.2.so)
==19124== Address 0x7df01a04 is on thread 1's stack
==19124== 20 bytes below stack pointer
==19124==
==19124== Invalid read of size 4
==19124== at 0x4000E54: ??? (in /lib/ld-uClibc-0.9.33.2.so)
==19124== Address 0x7df019f4 is on thread 1's stack
==19124== 20 bytes below stack pointer
==19124==
==19124==
==19124== HEAP SUMMARY:
==19124== in use at exit: 0 bytes in 0 blocks
==19124== total heap usage: 0 allocs, 0 frees, 0 bytes allocated
==19124==
==19124== All heap blocks were freed -- no leaks are possible
==19124==
==19124== For counts of detected and suppressed errors, rerun with: -v
==19124== ERROR SUMMARY: 64 errors from 4 contexts (suppressed: 0 from 0)
I found that "-D__UCLIBC__" flag should be applied when compiling valgrind,
but that didn't help, the output is the same.
Thank you for the answer.
I thought that the complaint is incorrect because it's complaining on a
simple program. Now I know that the complaint could be correct.
I couldn't run /bin/true in way you recommended, because no debug
information was provided, so I compiled simplest program with debug switch:
#include <iostream>
int main()
{
return 0;
}
Started gdbserver and connected to it using command:
(gdb) target remote | /usr/lib/valgrind/../../bin/vgdb --pid=2418
The output from gdb till first error:
Remote debugging using | /usr/lib/valgrind/../../bin/vgdb --pid=2418
relaying data between gdb and process 2418
Reading symbols from /lib/ld-uClibc.so.0...(no debugging symbols
found)...done.
Loaded symbols for /lib/ld-uClibc.so.0
warning: Unable to find dynamic linker breakpoint function.
GDB will be unable to debug shared library initializers
and track explicitly loaded dynamic code.
Cannot access memory at address 0x0
0x04000e68 in ?? ()
(gdb) c
Continuing.
Program received signal SIGTRAP, Trace/breakpoint trap.
0x040054ec in ?? ()
(gdb) info reg
r0 0x4007148 67137864
r1 0x0 0
r2 0x49ba000 77307904
r3 0x49bd90c 77322508
r4 0x4015f78 67198840
r5 0x4006054 67133524
r6 0xa 10
r7 0x4006ac0 67136192
r8 0x24 36
r9 0x401602c 67199020
r10 0x7d87aa48 2106042952 <%28210%29%20604-2952>
r11 0x7d87a674 2106041972 <%28210%29%20604-1972>
r12 0x7d87a678 2106041976 <%28210%29%20604-1976>
sp 0x7d87a678 0x7d87a678
lr 0x40054ec 67130604
pc 0x40054ec 0x40054ec
cpsr 0x20000010 536870928
Corresponding output from gdbserver:
==2418== Invalid read of size 4
==2418== at 0x40054EC: ??? (in /lib/ld-uClibc-0.9.33.2.so)
==2418== Address 0x7d87a664 is on thread 1's stack
==2418== 20 bytes below stack pointer
==2418==
==2418== (action on error) vgdb me ...
Next error:
(gdb) info reg
r0 0x7d87ad21 2106043681 <%28210%29%20604-3681>
r1 0x4a2b000 77770752
r2 0x10680 67200
r3 0x4a2f494 77788308
r4 0x7d87ad03 2106043651 <%28210%29%20604-3651>
r5 0x104d8 66776
r6 0x7d87aa60 2106042976 <%28210%29%20604-2976>
r7 0x8 8
r8 0x0 0
r9 0x0 0
r10 0x4015f78 67198840
r11 0x7d87aa4c 2106042956 <%28210%29%20604-2956>
r12 0x7d87aa50 2106042960 <%28210%29%20604-2960>
sp 0x7d87aa50 0x7d87aa50
lr 0x4a15cd4 77683924
pc 0x4a15cd4 0x4a15cd4
cpsr 0x20000010 536870928
And corresponding gdbserver output:
==2418== Invalid read of size 4
==2418== at 0x4A15CD4: ??? (in /lib/libuClibc-0.9.33.2.so)
==2418== Address 0x7d87aa3c is on thread 1's stack
==2418== 20 bytes below stack pointer
Next error:
(gdb) info reg
r0 0x207d8 133080
r1 0x1 1
r2 0x0 0
r3 0x10680 67200
r4 0x4a2b000 77770752
r5 0x0 0
r6 0x7d87aa60 2106042976 <%28210%29%20604-2976>
r7 0x4a2b400 77771776
r8 0x0 0
r9 0x0 0
r10 0x4015f78 67198840
r11 0x7d87aa2c 2106042924 <%28210%29%20604-2924>
r12 0x7d87aa30 2106042928 <%28210%29%20604-2928>
sp 0x7d87aa30 0x7d87aa30
lr 0x4a15ac0 77683392
pc 0x4a15ac0 0x4a15ac0
cpsr 0x20000010 536870928
Gdbserver:
==2418== Invalid read of size 4
==2418== at 0x4A15AC0: ??? (in /lib/libuClibc-0.9.33.2.so)
==2418== Address 0x7d87aa1c is on thread 1's stack
==2418== 20 bytes below stack pointer
And the last one:
(gdb) info reg
r0 0x482778c 75659148
r1 0x1 1
r2 0x4817000 75591680
r3 0x4817678 75593336
r4 0x4006178 67133816
r5 0x0 0
r6 0x4016034 67199028
r7 0x401602c 67199020
r8 0x0 0
r9 0x0 0
r10 0x4015f78 67198840
r11 0x7d87aa1c 2106042908 <%28210%29%20604-2908>
r12 0x7d87aa20 2106042912 <%28210%29%20604-2912>
sp 0x7d87aa20 0x7d87aa20
lr 0x4000e54 67112532
pc 0x4000e54 0x4000e54
cpsr 0x20000010 536870928
Gdbserver:
==2418== Invalid read of size 4
==2418== at 0x4000E54: ??? (in /lib/ld-uClibc-0.9.33.2.so)
==2418== Address 0x7d87aa0c is on thread 1's stack
==2418== 20 bytes below stack pointer
Summary:
==2418== HEAP SUMMARY:
==2418== in use at exit: 0 bytes in 0 blocks
==2418== total heap usage: 0 allocs, 0 frees, 0 bytes allocated
==2418==
==2418== All heap blocks were freed -- no leaks are possible
==2418==
==2418== For counts of detected and suppressed errors, rerun with: -v
==2418== ERROR SUMMARY: 128 errors from 4 contexts (suppressed: 0 from 0)
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