"bus error" on Linux Sparc

[dev-zero]

Igor Sysoev Wrote:
-------------------------------------------------------
> On Tue, Sep 08, 2009 at 10:34:58AM -0400, dev-zero
> wrote:
> 
> > Hi everyone
> > 
> > When I try to start nginx-0.8.14 on a
> Sparc-Linux I get a "Bus Error":
> > # nginx -c /etc/nginx/nginx.conf 
> > Bus error
> > 
> > With 'strace' I was able to track it down a
> little:
> > [...]
> > open("/etc/nginx/nginx.conf",
> O_RDONLY|O_LARGEFILE) = 4
> > fstat64(4, {st_mode=S_IFREG|0644, st_size=1610,
> ...}) = 0
> > pread(4, Bus error
> > 
> > Now, according to that I think the error might
> be in ngx_read_file where a u_char* is passed as a
> void* as second argument for pread, which in turn
> is probably a long and should therefore be aligned
> on sparc.
> > Even if that is the actual problem I have no
> idea how to fix it. Any ideas?
> 
> Could you create coredump and run 
> 
> gdb /path/to/nginx /path/to/core
> bt
> 

Sure, here we go...

The first bug is a segfault I've been experiencing a lot when doing a config check while the server is already running:

Core was generated by `/usr/sbin/nginx -c /etc/nginx/nginx.conf -t'.
Program terminated with signal 11, Segmentation fault.

#0  ngx_hash_add_key (ha=0xff82b270, key=0xf7ba5a4c, value=0xc960, flags=75334) at src/core/ngx_hash.c:814
814	    *name = *key;
#1  0x00000008 in ?? ()
(gdb) 

And the coredump+gdb-bt from the bus error mentioned before:

Core was generated by `nginx -c /etc/nginx/nginx.conf -t'.
Program terminated with signal 10, Bus error.

#0  ngx_palloc (pool=0xa1230, size=784) at src/core/ngx_palloc.c:126
126	            m = ngx_align_ptr(p->d.last, NGX_ALIGNMENT);
(gdb) bt
#0  ngx_palloc (pool=0xa1230, size=784) at src/core/ngx_palloc.c:126
#1  0x0003c608 in ngx_http_core_create_srv_conf (cf=0xffa87280) at src/core/ngx_array.h:43
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
(gdb) 

And the original C/LDFLAGS I've been using to compile nginx:
CFLAGS="-O2 -mcpu=ultrasparc -pipe -ggdb"
LDFLAGS="-Wl,-O2,--hash-style=gnu,--sort-common,--as-needed"
Dropping the LDFLAGS didn't help, also didn't reducing -O2 to -O1 in CFLAGS.
GCC version is: 4.3.2, glibc: 2.9_p20081201, kernel: 2.6.31-rc9

Thanks in advance for your help,
Cheers,
Tiziano

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,5969,6078#msg-6078