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From Alex Potapenko <opotape...@gmail.com>
Subject [users@httpd] cross-compiled httpd 2.4.9: Segmentation fault. 0x403428ec in pthread_mutex_lock () from /lib/libc.so.0
Date Thu, 15 Jan 2015 13:28:35 GMT
Dear all!

I'm trying to get httpd to work on my router using optware. I added optware
target with the same toolchain used to build router's firmware. While
numerous packages I built so far work fine, launching any binary that comes
with httpd results in a segfault:

root@unknown:/tmp/home/root# gdb /opt/sbin/httpd
> GNU gdb (GDB) 7.8.1
> Copyright (C) 2014 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <
> http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
> and "show warranty" for details.
> This GDB was configured as "arm-linux".
> Type "show configuration" for configuration details.
> For bug reporting instructions, please see:
> <http://www.gnu.org/software/gdb/bugs/>.
> Find the GDB manual and other documentation resources online at:
> <http://www.gnu.org/software/gdb/documentation/>.
> For help, type "help".
> Type "apropos word" to search for commands related to "word"...
> Reading symbols from /opt/sbin/httpd...done.
> (gdb) run -d
> Starting program: /opt/sbin/httpd -d
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/opt/lib/libthread_db.so.1".
> Program received signal SIGSEGV, Segmentation fault.
> 0x403428ec in pthread_mutex_lock () from /opt/lib/libc.so.0
> (gdb) bt full
> #0  0x403428ec in pthread_mutex_lock () from /opt/lib/libc.so.0
> No symbol table info available.
> #1  0x40342910 in pthread_mutex_lock () from /opt/lib/libc.so.0
> No symbol table info available.
> #2  0x40342910 in pthread_mutex_lock () from /opt/lib/libc.so.0
> No symbol table info available.
> #3  0x40342910 in pthread_mutex_lock () from /opt/lib/libc.so.0
> No symbol table info available.
> #4  0x40342910 in pthread_mutex_lock () from /opt/lib/libc.so.0
> No symbol table info available.
> #5  0x40342910 in pthread_mutex_lock () from /opt/lib/libc.so.0
> No symbol table info available.
> #6  0x40342910 in pthread_mutex_lock () from /opt/lib/libc.so.0
> No symbol table info available.
> #7  0x40342910 in pthread_mutex_lock () from /opt/lib/libc.so.0
> No symbol table info available.
> #8  0x40342910 in pthread_mutex_lock () from /opt/lib/libc.so.0
> No symbol table info available.
> #9  0x40342910 in pthread_mutex_lock () from /opt/lib/libc.so.0
> No symbol table info available.
> #10 0x40342910 in pthread_mutex_lock () from /opt/lib/libc.so.0
> No symbol table info available.
> #11 0x40342910 in pthread_mutex_lock () from /opt/lib/libc.so.0
> No symbol table info available.
> #12 0x40342910 in pthread_mutex_lock () from /opt/lib/libc.so.0
> No symbol table info available.
> #13 0x40342910 in pthread_mutex_lock () from /opt/lib/libc.so.0
> No symbol table info available.
> #14 0x40342910 in pthread_mutex_lock () from /opt/lib/libc.so.0
> No symbol table info available.
> #15 0x40342910 in pthread_mutex_lock () from /opt/lib/libc.so.0
> No symbol table info available.
> #16 0x40342910 in pthread_mutex_lock () from /opt/lib/libc.so.0
> No symbol table info available.
> #17 0x40342910 in pthread_mutex_lock () from /opt/lib/libc.so.0
> No symbol table info available.
> #18 0x40342910 in pthread_mutex_lock () from /opt/lib/libc.so.0
> No symbol table info available.
> #19 0x40342910 in pthread_mutex_lock () from /opt/lib/libc.so.0
> No symbol table info available.
> #20 0x40342910 in pthread_mutex_lock () from /opt/lib/libc.so.0
> No symbol table info available.
> #21 0x40342910 in pthread_mutex_lock () from /opt/lib/libc.so.0
> No symbol table info available.
> #22 0x40342910 in pthread_mutex_lock () from /opt/lib/libc.so.0
> No symbol table info available.
> #23 0x40342910 in pthread_mutex_lock () from /opt/lib/libc.so.0
> No symbol table info available.
> ---Type <return> to continue, or q <return> to quit---q
> Quit
> (gdb) info sharedlibrary
> From        To          Syms Read   Shared Object Library
> 0x40019930  0x4001ce90  Yes (*)     /lib/ld-uClibc.so.0
> 0x401bbd1c  0x401db6c8  Yes         /opt/lib/libpcre.so.1
> 0x40129524  0x4013f1e4  Yes         /opt/lib/libaprutil.so.0
> 0x4014bdb8  0x4014eba0  Yes         /opt/lib/libgdbm.so.3
> 0x400ca11c  0x400e6034  Yes         /opt/lib/libexpat.so.1
> 0x401e7118  0x401fb040  Yes         /opt/lib/libiconv.so.2
> 0x40161170  0x4017b60c  Yes         /opt/lib/libapr.so.0
> 0x4018709c  0x401891bc  Yes         /opt/lib/libuuid.so.1
> 0x40192620  0x40192a94  Yes (*)     /opt/lib/librt.so.0
> 0x4019d31c  0x401a9cf8  Yes         /opt/lib/libm.so.0
> 0x402cc4ac  0x402cdda4  Yes         /opt/lib/libcrypt.so.0
> 0x400f1784  0x400f2564  Yes (*)     /opt/lib/libdl.so.0
> 0x400fe7b0  0x4010554c  Yes         /opt/lib/libgcc_s.so.1
> 0x402fd990  0x40344904  Yes         /opt/lib/libc.so.0
> 0x403621e8  0x4036851c  Yes         /opt/lib/libpthread.so.0
> 0x403bc9c8  0x40405698  Yes         /opt/lib/libstdc++.so.6
> 0x40439990  0x40480904  Yes         /lib/libc.so.0
> 0x400ab31c  0x400b7cf8  Yes         /lib/libm.so.0
> 0x4049c7b0  0x404a354c  Yes         /lib/libgcc_s.so.1
> (*): Shared library is missing debugging information.


The stack entries are seemingly endless, my patience got me to 6k+, and
they're all identical. It looks like httpd is endlessly trying to acquire
some lock, until stack is overflown, but I have no idea how to debug
further. I even went on and compiled non-stripped version of uClibc in the
hope that maybe I could get more info, but still no luck.

Any help and guidance on solving this is greatly appreciated!

-- 
Best regards,
Alex Potapenko

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