Unable to use strace in embedded mips system

[Davide Palma]

Hello,
I'm trying to strace an application directly in a real embedded MIPS32
chipset that runs uclinux.

This is the toolchain I used to compile strace:
david at devuan:~$ mipsel-buildroot-linux-uclibc-gcc -v
Using built-in specs.
COLLECT_GCC=/home/david/Downloads/buildroot-2017.05.2/output/host/usr/bin/mipsel-buildroot-linux-uclibc-gcc.br_real
COLLECT_LTO_WRAPPER=/home/david/Downloads/buildroot-2017.05.2/output/host/usr/libexec/gcc/mipsel-buildroot-linux-uclibc/5.4.0/lto-wrapper
Target: mipsel-buildroot-linux-uclibc
Configured with: ./configure
--prefix=/home/david/Downloads/buildroot-2017.05.2/output/host/usr
--sysconfdir=/home/david/Downloads/buildroot-2017.05.2/output/host/etc
--enable-static --target=mipsel-buildroot-linux-uclibc
--with-sysroot=/home/david/Downloads/buildroot-2017.05.2/output/host/usr/mipsel-buildroot-linux-uclibc/sysroot
--disable-__cxa_atexit --with-gnu-ld --disable-libssp --disable-multilib
--with-gmp=/home/david/Downloads/buildroot-2017.05.2/output/host/usr
--with-mpc=/home/david/Downloads/buildroot-2017.05.2/output/host/usr
--with-mpfr=/home/david/Downloads/buildroot-2017.05.2/output/host/usr
--with-pkgversion='Buildroot 2017.05.2' --with-bugurl=
http://bugs.buildroot.net/ --disable-libquadmath --disable-libsanitizer
--enable-tls --disable-libmudflap --enable-threads --without-isl
--without-cloog --with-float=soft --disable-decimal-float
--with-arch=mips32 --with-abi=32 --enable-languages=c
--with-build-time-tools=/home/david/Downloads/buildroot-2017.05.2/output/host/usr/mipsel-buildroot-linux-uclibc/bin
--enable-shared --disable-libgomp
Thread model: posix
gcc version 5.4.0 (Buildroot 2017.05.2)


And this is what happens in the system:
# ./strace -V
strace -- version 4.15
# ./strace -dv echo foo
./strace: ptrace_setoptions = 0x51
./strace: PTRACE_SEIZE doesn't work
./strace: new tcb for pid 323, active tcbs:1
./strace: [wait(0x00177f) = 323] WIFSTOPPED,sig=SIGSTOP
./strace: pid 323 has TCB_STARTUP, initializing it
./strace: setting opts 0x51 on pid 323
./strace: ignored SIGSTOP on pid 323
./strace: [wait(0x00857f) = 323] WIFSTOPPED,sig=133
execve(./strace: process_vm_readv: Unknown error -89
0x7fad0a68, ./strace: process_vm_readv: Unknown error -89
0x7fad1ebc, ./strace: process_vm_readv: Unknown error -89
0x7fad1ec8./strace: [wait(0x04057f) = 323]
WIFSTOPPED,sig=SIGTRAP,EVENT_EXEC (4)
./strace: [wait(0x00857f) = 323] WIFSTOPPED,sig=133
) = 0
./strace: [wait(0x00857f) = 323] WIFSTOPPED,sig=133
./strace: process_vm_readv: Unknown error -89
mmap(
//strace hangs up here, I press control c
./strace: cleanup: looking at pid 323
./strace: Process 323 detached
./strace: dropped tcb for pid 323, 0 remain
 <detached ...>
#

What do you suggest me to do?
Thank you,
David
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