On Sun, Dec 15, 2013, Dimitry Andric wrote:
> > Program received signal SIGBUS, Bus error.
> > sha1_block_data_order_ssse3 () at sha1-x86_64.s:1328
> > 1328 movdqa %xmm0,0(%rsp)
> > rsp 0x800736048 0x800736048
> This is most likely a stack alignment problem. The movdqa instruction
> needs the source or destination to be aligned to 16 bytes, while your
> stack pointer is aligned to 8 bytes, causing a bus error.
Thanks for all the replies about this (stack alignment) problem.
> Can you please try putting a breakpoint on sha1_block_data_order_ssse3,
> and checking what the value of %rsp is at the start of the function?
Breakpoint 5, sha1_block_data_order_ssse3 () at sha1-x86_64.s:1295
1295 pushq %rbx
Current language: auto; currently asm
(gdb) p $rsp
$15 = (void *) 0x8007360a0
[looks ok]
(gdb) n
sha1_block_data_order_ssse3 () at sha1-x86_64.s:1296
1296 pushq %rbp
(gdb) p $rsp
$16 = (void *) 0x800736098
(gdb) n
sha1_block_data_order_ssse3 () at sha1-x86_64.s:1297
1297 pushq %r12
(gdb) p $rsp
$17 = (void *) 0x800736090
[looks ok again]
(gdb) n
sha1_block_data_order_ssse3 () at sha1-x86_64.s:1298
1298 leaq -64(%rsp),%rsp
(gdb) p $rsp
$18 = (void *) 0x800736088
[hmm, now it's wrong?]
(gdb) n
sha1_block_data_order_ssse3 () at sha1-x86_64.s:1299
1299 movq %rdi,%r8
(gdb) p $rsp
$19 = (void *) 0x800736048
[still wrong, stays the same until:]
....
(gdb) n
1328 movdqa %xmm0,0(%rsp)
(gdb) n
Program received signal SIGBUS, Bus error.
sha1_block_data_order_ssse3 () at sha1-x86_64.s:1328
(gdb) where
#0 sha1_block_data_order_ssse3 () at sha1-x86_64.s:1295
#1 0x000000000045bc68 in SHA1_Final (md=0x8007361d8 "?u??;??Pqs\224??0s?????",
c=0x800c39240) at md32_common.h:372
#2 0x0000000000487bb4 in final (ctx=0x8007361a8, md=0x8007361d8
"?u??;??Pqs\224??0s?????") at m_sha1.c:81
#3 0x00000000004800ec in EVP_DigestFinal_ex (ctx=0x8007361a8, md=0x8007361d8
"?u??;??Pqs\224??0s?????", size=0x0)
at digest.c:272
#4 0x000000000050e089 in ssleay_rand_add (buf=0x8007362a0, num=8, add=0) at
md_rand.c:289
#5 0x000000000047da97 in RAND_add (buf=0x8007362a0, num=8, entropy=0) at
rand_lib.c:157
#6 0x000000000040de2b in ssl23_accept (s=0x800c49c00) at s23_srvr.c:155
#7 0x000000000041a384 in SSL_accept (s=0x800c49c00) at ssl_lib.c:940
#8 0x000000000040b2dd in do_tls_operation (fp=<value optimized out>,
hsfunc=0x41a350 <SSL_accept>, rfunc=0, wfunc=0,
buf=0x0, num=0, bytes=0x8007384a8) at ../../mta/libmta/tlsbio.c:218
#9 0x0000000000405394 in handle_session (srv_socket_index=<value optimized
out>, cli_nfd=0x800c06ac0)
at ../../../mta/statethreads/examples/smtps2.c:2904
#10 0x0000000000408c43 in handle_connections (arg=0x0) at
../../../mta/statethreads/examples/smtps2.c:1778
#11 0x000000000056e38f in _st_thread_main () at
../../mta/statethreads/sched.c:329
#12 0x000000000056e473 in st_thread_create (start=0x4089e0
<handle_connections>, arg=0x0, joinable=0,
stk_size=<value optimized out>) at ../../mta/statethreads/sched.c:593
#13 0x0000000000000000 in ?? ()
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