From: Ken Brown <kbrown@cornell.edu>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 17817@debbugs.gnu.org
Subject: bug#17817: 24.3.91; Assertion failure in bidi.c (Cygwin-w32 build)
Date: Sat, 21 Jun 2014 15:14:24 -0400 [thread overview]
Message-ID: <53A5D990.7020109@cornell.edu> (raw)
In-Reply-To: <83oaxnqvru.fsf@gnu.org>
On 6/20/2014 2:29 PM, Eli Zaretskii wrote:
>> Date: Fri, 20 Jun 2014 12:43:14 -0400
>> From: Ken Brown <kbrown@cornell.edu>
>> CC: 17817@debbugs.gnu.org
>>
>> (gdb) disas bidi_check_type
>> Dump of assembler code for function bidi_check_type:
>> 0x00000001004fb4c3 <+0>: push %rbp
>> 0x00000001004fb4c4 <+1>: mov %rsp,%rbp
>> 0x00000001004fb4c7 <+4>: sub $0x20,%rsp
>> 0x00000001004fb4cb <+8>: mov %ecx,0x10(%rbp)
>> 0x00000001004fb4ce <+11>: mov 0x56402b(%rip),%rax # 0x100a5f500 <.refptr.suppress_checking>
>> 0x00000001004fb4d5 <+18>: movzbl (%rax),%eax
>> 0x00000001004fb4d8 <+21>: xor $0x1,%eax
>> 0x00000001004fb4db <+24>: test %al,%al
>> 0x00000001004fb4dd <+26>: je 0x1004fb4ff <bidi_check_type+60>
>> 0x00000001004fb4df <+28>: cmpl $0x17,0x10(%rbp)
>> 0x00000001004fb4e3 <+32>: jbe 0x1004fb4ff <bidi_check_type+60>
>
> So the value compared to 23 (17 hex) is at address %rbp+0x10. What
> does this display:
>
> (gdb) p *(bidi_type_t *)($rbp+0x10)
>
> (or maybe you should use %rbp with 64-bit build, I don't know).
I'm away from the computer where this crash occurred and won't have
access to it for the next few days.
In the meantime, the recent issue that we discussed on the Cygwin list
made me wonder if there's some interaction with Glib that's causing
these weird crashes. Even though that particular bug only occurred in
the 32-bit case, I'm still suspicious.
I think I'll start using --with-file-notification=no for a while, to see
if that cuts down on the crash reports.
Ken
next prev parent reply other threads:[~2014-06-21 19:14 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-20 13:42 bug#17817: 24.3.91; Assertion failure in bidi.c (Cygwin-w32 build) Ken Brown
2014-06-20 14:21 ` Eli Zaretskii
2014-06-20 14:40 ` Ken Brown
2014-06-20 14:47 ` Eli Zaretskii
2014-06-20 14:54 ` Ken Brown
2014-06-20 16:43 ` Ken Brown
2014-06-20 18:29 ` Eli Zaretskii
2014-06-21 19:14 ` Ken Brown [this message]
2014-06-21 19:30 ` Eli Zaretskii
2014-06-21 19:36 ` Ken Brown
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