Gabor Gombas wrote:
>> Program terminated with signal 10, Bus error.
>> #0 0x0000000100011e04 in mailbox_write_index_header
>> (mailbox=0xffffffff7fff3f70) at mailbox.c:1319
>> 1319 *((bit64 *)(buf+OFFSET_HIGHESTMODSEQ_64)) =
>> htonll(mailbox->highestmodseq);
>
> Could you do a "p &buf" here? My guess would be that it is not 8-byte
> aligned (because nobody told the compiler that it should be), and
> therefore the code above generates an unaligned access, which explains
> the bus error perfectly.
Program terminated with signal 10, Bus error.
#0 0x0000000100011e04 in mailbox_write_index_header
(mailbox=0xffffffff7fff3f70)
at mailbox.c:1319
1319 *((bit64 *)(buf+OFFSET_HIGHESTMODSEQ_64)) =
htonll(mailbox->highestmodseq);
(gdb) p &buf
$1 = (char (*)[96]) 0xffffffff7fff3da0
> You can also try to replace
>
> char buf[INDEX_HEADER_SIZE];
>
> with
>
> union {
> char buf[INDEX_HEADER_SIZE];
> #ifdef HAVE_LONG_LONG_INT
> long long int dummy;
> #endif
> } u;
>
> to force the required alignment, and also replace every reference to
> "buf" with "u.buf" inside the function. You may also use an unnamed
> union and avoid the u.buf replaces if the Sun compiler supports unnamed
> unions.
#0 0x0000000100011dec in mailbox_write_index_header
(mailbox=0xffffffff7fff3f60)
at mailbox.c:1322
1322 *((bit64 *)(u.buf+OFFSET_HIGHESTMODSEQ_64)) =
htonll(mailbox->highestmodseq);
(gdb) p &u.buf
$1 = (char (*)[96]) 0xffffffff7fff3d90
Thanks a lot!
--
Alex Deiter
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