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bug#18438: 24.4.50; assertion failed in bidi.c


From: Ken Brown
Subject: bug#18438: 24.4.50; assertion failed in bidi.c
Date: Sun, 21 Sep 2014 18:30:09 -0400
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0

On 9/18/2014 10:42 AM, Eli Zaretskii wrote:
Date: Thu, 18 Sep 2014 16:59:34 +1200
From: address@hidden
Cc: Eli Zaretskii <address@hidden>

My reading of this is:

   . the value being tested is originally in ECX
   . it is stored in a temporary local variable at RBP+0x10
   . then it is compared with 0x17 (decimal 23)

So you have two places to check: the ECX register and the value
pointed to by RBP+0x10.

Here we are:

(gdb) print $ecx
$3 = 6
(gdb) x $rbp+0x10
0x222e10:       0x00000001

Thanks.  Both values are valid, although the second one is probably
the accurate one.

So again, this is a riddle for which I have no clues.  Perhaps the
strange backtraces reported in bug #17753, and the discussion Ken
started on the Cygwin list about that, will bring some insight (e.g.,
is it possible that this code also runs in some other thread?).

The other possibility is that the strange backtraces are due to a bug in gdb that has since been fixed. PR 16155 (https://sourceware.org/bugzilla/show_bug.cgi?id=16155) seems like a possible candidate for such a bug, but I haven't yet tried to verify this. OP, could you update to Cygwin's gdb-7.8-2 and see if your backtraces start to make more sense? The problem with gdb-7.8-1 that I mentioned earlier has been fixed.

Ken





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