"bus error" on Linux Sparc

[dev-zero]

Igor Sysoev Wrote:
-------------------------------------------------------
> On Wed, Sep 09, 2009 at 05:27:47AM -0400, dev-zero
> wrote:
> 
> > 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
> 
> Could you rebuild nginx with
> CFLAGS="-DNGX_ALIGNMENT=16 ..."

Done. Did not help, same result:
# nginx -c /etc/nginx/nginx.conf -t
Bus error (core dumped)

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,5969,6081#msg-6081