[Bug 327] New: segfault with setrlimit/pthread.old on 0.9.30.1

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=327

              Host: x86_64-pc-linux-gnu
            Target: i586-geode-linux-uclibc
             Build: i586-geode-linux-uclibc
           Summary: segfault with setrlimit/pthread.old on 0.9.30.1
           Product: uClibc
           Version: 0.9.30.1
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: Threads
        AssignedTo: unassigned at uclibc.org
        ReportedBy: beber at meleeweb.net
                CC: uclibc-cvs at uclibc.org
   Estimated Hours: 0.0


Hi,

I'm using gentoo crossdev-wrappers build environnement to build my own system
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, 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 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 exemple, but that's the same with other libpthread/setrlimit
using software (lsattr, squid).

Actually it fail with >= 0.9.29 and >=0.9.30 and work good with 0.9.28*

You'll find attached the config


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