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uclibc-0.9.30.1 and setrlimit

 

 

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beber at meleeweb

May 5, 2009, 11:59 AM

Post #1 of 1 (930 views)
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uclibc-0.9.30.1 and setrlimit

Hi,

I'm searching how to resolv since some times and I think I shoud ask
for help :).

I'm cross-compilating with crossdev-wrappers from x86_64-pc-linux-gnu
to i586-geode-linux-uclibc with gcc 3.4.6-r2, kernel 2.6.28-r1 and
libc/libthread_old 0.9.30.1-r1. All almost compile fine and work good, but not software
linked with libpthread and doing setrlimit like e2fsprogs with chattr :

# chattr
Segmentation fault

And I get the following line in dmesg :
[470178.800998] chattr[6143]: segfault at 1ffe61 ip 00000000f7f59bd0 sp 00000000ffdca3c4 error 4 in libpthread-0.9.30.1.so[f7f55000+b000]

strace give the following :

ioctl(0, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
ioctl(1, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
getpid() = 7492
getrlimit(RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM_INFINITY}) = 0
setrlimit(RLIMIT_STACK, {rlim_cur=2040*1024, rlim_max=RLIM_INFINITY}) = 0
rt_sigaction(SIGRTMIN, {0xf7f31109, [], SA_RESTORER, 0xf7f4766b}, NULL, 8) = 0
rt_sigaction(SIGRT_1, {0xf7f31185, [RTMIN], SA_RESTORER, 0xf7f4766b}, NULL, 8) = 0
rt_sigaction(SIGRT_2, {0xf7f3126f, [], SA_RESTORER, 0xf7f4766b}, NULL, 8) = 0
rt_sigprocmask(SIG_BLOCK, [RTMIN], NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [RT_1], NULL, 8) = 0
--- SIGSEGV (Segmentation fault) @ 0 (0) ---

and gdb :
This GDB was configured as "i586-geode-linux-uclibc"...
(gdb) run
Starting program: /bin/chattr
[Thread debugging using libthread_db enabled]
[New Thread 0x400 (LWP 7575)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x400 (LWP 7575)]
0xf7f07bd0 in _pthread_cleanup_push_defer () from /lib/libpthread.so.0
(gdb) bt
#0 0xf7f07bd0 in _pthread_cleanup_push_defer () from /lib/libpthread.so.0
(gdb) br
Breakpoint 1 at 0xf7f07bd0

When I compile uclibc with debug USE flags, all works fine. That's a
bit perturbing.

First, I don't understand why gdb can't give me more debug information,
even if I build with CFLAGS=-g and FEATURES=nostrip

Second, I don't understand why this is working when debug is activated.
I can't run device with a 51MB libc which is slowing down almost
everything.

chattr is just an eemple, but that's the same with other
libpthread/setrlimit using software.

You'll find attahed the uclibc .config.

Thanks for your help

--
Beber
Attachments: uclibc-0.9.30.1-r1.config (5.59 KB)
  signature.asc (0.19 KB)

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