From: Dan Nicolaescu <dann@gnu.org>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 10164@debbugs.gnu.org, Tim Crews <tim.crews@code-affinity.com>
Subject: bug#10164: 24.0.91; Instant crash enabling linum-mode
Date: Wed, 30 Nov 2011 07:52:40 -0500 [thread overview]
Message-ID: <yxqliqx3h7r.fsf@fencepost.gnu.org> (raw)
In-Reply-To: <E1RVj8m-00006V-HK@fencepost.gnu.org> (Eli Zaretskii's message of "Wed, 30 Nov 2011 07:19:56 -0500")
Eli Zaretskii <eliz@gnu.org> writes:
>> Date: Tue, 29 Nov 2011 19:05:20 -0700
>> From: Tim Crews <tim.crews@code-affinity.com>
>>
>> Start Emacs with runemacs -Q --no-init-file
>> C-x C-f foo.txt
>> M-x linum-mode
>> (Emacs doesn't crash yet)
>> Type anything. Emacs instantly crashes.
>
> Arrgh! This is GCC 4.6.x "as-is" code reordering in action. Emacs
> crashes here:
>
> xassert (!row->enabled_p
> || row->mode_line_p
> || verify_row_hash (row));
>
> Evidently, it calls verify_row_hash before it tests row->mode_line_p.
Are you sure? Without interprocedural analysis the compiler cannot know
that `verify_row_hash' does not alter row->enabled_p, so it cannot
change the evaluation order.
BTW, the argument for row_hash should be const.
next prev parent reply other threads:[~2011-11-30 12:52 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-30 2:05 bug#10164: 24.0.91; Instant crash enabling linum-mode Tim Crews
2011-11-30 12:19 ` Eli Zaretskii
2011-11-30 12:52 ` Dan Nicolaescu [this message]
2011-11-30 13:54 ` Eli Zaretskii
2011-11-30 15:51 ` Dan Nicolaescu
2011-11-30 15:01 ` Andy Moreton
2011-11-30 15:10 ` Juanma Barranquero
2011-11-30 12:29 ` Eli Zaretskii
2011-11-30 12:38 ` Juanma Barranquero
2011-11-30 13:40 ` Eli Zaretskii
[not found] ` <CAAeL0SS_ydvYGqw0rOd3UR6RoYzJWkEkFhaYX5kZ2m+vTx-Q0w@mail.gmail.com>
[not found] ` <E1RVkfB-00062i-AB@fencepost.gnu.org>
[not found] ` <CAAeL0SRW1A7-vOzNGxFvGtbv=zVSo2ji+_HB7R8rFtq15ufhPg@mail.gmail.com>
2011-11-30 16:24 ` Eli Zaretskii
2011-11-30 16:29 ` Chong Yidong
2011-11-30 16:35 ` Chong Yidong
2011-11-30 16:39 ` Juanma Barranquero
2011-11-30 16:42 ` Chong Yidong
2011-11-30 16:56 ` Eli Zaretskii
2011-11-30 17:37 ` Chong Yidong
2011-11-30 18:10 ` Dan Nicolaescu
2011-11-30 18:29 ` Eli Zaretskii
2011-11-30 18:55 ` Dan Nicolaescu
[not found] ` <handler.10164.D10164.132267227016711.notifdone@debbugs.gnu.org>
2011-11-30 17:29 ` bug#10164: closed (Instant crash enabling linum-mode) Tim Crews
2011-11-30 18:06 ` Eli Zaretskii
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