[uClibc 0002264]: pthread issues with 0.9.29
bugs at busybox.net
bugs at busybox.net
Thu Feb 28 10:32:21 UTC 2008
A NOTE has been added to this issue.
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http://busybox.net/bugs/view.php?id=2264
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Reported By: kannappan
Assigned To: uClibc
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Project: uClibc
Issue ID: 2264
Category: Posix Threads
Reproducibility: always
Severity: major
Priority: normal
Status: feedback
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Date Submitted: 02-20-2008 03:29 PST
Last Modified: 02-28-2008 02:32 PST
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Summary: pthread issues with 0.9.29
Description:
I am using uclibc0.9.29, binutils 2.18 for ARM926T
I am facing problems executing applications which uses pthread.
when including pthread library my application crashes giving message
"segmentation fault". But the same is working with glibc .
When I debugged using strace It gave following error message
# strace ./run_loop
execve("./run_loop", ["./run_loop"], [/* 16 vars */]) = -1 ENOEXEC (Exec
format
error)
write(2, "strace: exec: Exec format error\n", 32strace: exec: Exec format
error
) = 32
exit(1) = ?
Process 738 detached
======================================================================
----------------------------------------------------------------------
carmelo73 - 02-20-08 04:40
----------------------------------------------------------------------
>From your output there is no evidence of a segfault. Please provide more
information.
Command line used to build your application. Source code if available.
Further I suggest you to build with debug synmbol (both your application
and uclibc) and start using gdb to debug.
The info you provide are not enough to figure out what is going wrong
----------------------------------------------------------------------
kannappan - 02-22-08 00:06
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The problem happens when -lpthread is used along with -lc.
for example:
# arm-linux-gcc -lc -lpthread sample.c
The strace for this attached.
The same program works when i compile with
# arm-linux-gcc -lpthread sample.c
----------------------------------------------------------------------
carmelo73 - 02-22-08 00:13
----------------------------------------------------------------------
As a general suggestion, you don't need to link explicitly against libc
(-lc)...
it is done by default by the compiler (append -v at your build command and
you will see what it is doing silently)
Further are you sure arm-linux-gcc is properly configured for uClibc ?
Could you post the output of the command readelf -l <executable> ?
----------------------------------------------------------------------
vapier - 02-22-08 17:25
----------------------------------------------------------------------
straces are not terribly useful when talking about a threading crash
please post a source code test case which we can compile/debug
----------------------------------------------------------------------
kannappan - 02-28-08 02:32
----------------------------------------------------------------------
Following is the output of readelf
[kans at localhost test]$ arm-linux-readelf -l a.out
Elf file type is EXEC (Executable file)
Entry point 0x83ac
There are 5 program headers, starting at offset 52
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
PHDR 0x000034 0x00008034 0x00008034 0x000a0 0x000a0 R E 0x4
INTERP 0x0000d4 0x000080d4 0x000080d4 0x00014 0x00014 R 0x1
[Requesting program interpreter: /lib/ld-uClibc.so.0]
LOAD 0x000000 0x00008000 0x00008000 0x0050c 0x0050c R E
0x8000
LOAD 0x00050c 0x0001050c 0x0001050c 0x000ec 0x00108 RW
0x8000
DYNAMIC 0x000518 0x00010518 0x00010518 0x000c0 0x000c0 RW 0x4
Section to Segment mapping:
Segment Sections...
00
01 .interp
02 .interp .hash .dynsym .dynstr .rel.plt .init .plt .text .fini
.rodata .eh_frame
03 .init_array .fini_array .jcr .dynamic .got .data .bss
04 .dynamic
Following are the output when compiled with -v option
Using built-in specs.
Target: arm-linux-uclibcgnueabi
Configured with:
/data/buildroot/buildroot/toolchain_build_arm/gcc-4.1.2/configure
--prefix=/data/buildroot/buildroot/build_arm/staging_dir
--build=i386-pc-linux-gnu --host=i386-pc-linux-gnu
--target=arm-linux-uclibcgnueabi --enable-languages=c,c++
--disable-__cxa_atexit --enable-target-optspace --with-gnu-ld
--enable-shared --disable-nls --enable-threads --disable-multilib
--with-float=soft
Thread model: posix
gcc version 4.1.2
/data/buildroot/buildroot/build_arm/staging_dir/libexec/gcc/arm-linux-uclibcgnueabi/4.1.2/cc1
-quiet -v sample.c -quiet -dumpbase sample.c -mfloat-abi=soft -auxbase
sample -version -o /tmp/ccESRQ7x.s
ignoring nonexistent directory
"/data/buildroot/buildroot/build_arm/staging_dir/lib/gcc/arm-linux-uclibcgnueabi/4.1.2/../../../../arm-linux-uclibcgnueabi/include"
#include "..." search starts here:
#include <...> search starts here:
/data/buildroot/buildroot/build_arm/staging_dir/lib/gcc/arm-linux-uclibcgnueabi/4.1.2/include
/data/buildroot/buildroot/build_arm/staging_dir/lib/gcc/arm-linux-uclibcgnueabi/4.1.2/../../../../arm-linux-uclibcgnueabi/sys-include
End of search list.
GNU C version 4.1.2 (arm-linux-uclibcgnueabi)
compiled by GNU C version 3.4.6 20060404 (Red Hat 3.4.6-8).
GGC heuristics: --param ggc-min-expand=64 --param ggc-min-heapsize=64298
Compiler executable checksum: 38e7075577afcde72725d9029281c4bb
/data/buildroot/buildroot/build_arm/staging_dir/usr/bin/arm-linux-uclibcgnueabi-as
-mfloat-abi=soft -meabi=4 -o /tmp/ccW0JqfY.o /tmp/ccESRQ7x.s
/data/buildroot/buildroot/build_arm/staging_dir/libexec/gcc/arm-linux-uclibcgnueabi/4.1.2/collect2
--eh-frame-hdr -dynamic-linker /lib/ld-uClibc.so.0 -X -m armelf_linux_eabi
/data/buildroot/buildroot/build_arm/staging_dir/lib/gcc/arm-linux-uclibcgnueabi/4.1.2/../../../../arm-linux-uclibcgnueabi/lib/crt1.o
/data/buildroot/buildroot/build_arm/staging_dir/lib/gcc/arm-linux-uclibcgnueabi/4.1.2/../../../../arm-linux-uclibcgnueabi/lib/crti.o
/data/buildroot/buildroot/build_arm/staging_dir/lib/gcc/arm-linux-uclibcgnueabi/4.1.2/crtbegin.o
-L/data/buildroot/buildroot/build_arm/staging_dir/lib/gcc/arm-linux-uclibcgnueabi/4.1.2
-L/data/buildroot/buildroot/build_arm/staging_dir/lib/gcc/arm-linux-uclibcgnueabi/4.1.2/../../../../arm-linux-uclibcgnueabi/lib
/tmp/ccW0JqfY.o -lpthread -lgcc --as-needed -lgcc_s --no-as-needed -lc
-lgcc --as-needed -lgcc_s --no-as-needed
/data/buildroot/buildroot/build_arm/staging_dir/lib/gcc/arm-linux-uclibcgnueabi/4.1.2/crtend.o
/data/buildroot/buildroot/build_arm/staging_dir/lib/gcc/arm-linux-uclibcgnueabi/4.1.2/../../../../arm-linux-uclibcgnueabi/lib/crtn.o
Issue History
Date Modified Username Field Change
======================================================================
02-20-08 03:29 kannappan New Issue
02-20-08 03:29 kannappan Status new => assigned
02-20-08 03:29 kannappan Assigned To => uClibc
02-20-08 04:40 carmelo73 Note Added: 0005174
02-20-08 04:40 carmelo73 Status assigned => feedback
02-22-08 00:03 kannappan File Added: a
02-22-08 00:06 kannappan Note Added: 0005224
02-22-08 00:13 carmelo73 Note Added: 0005234
02-22-08 17:25 vapier Note Added: 0005254
02-28-08 02:32 kannappan Note Added: 0005494
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