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From: "gulsenenginar at aol dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug tdep/27369] ARC: Stepping over atomic instruction sequences loops infinitely
Date: Sat, 09 Oct 2021 11:00:43 +0000 [thread overview]
Message-ID: <bug-27369-4717-Nt0xHzx25z@http.sourceware.org/bugzilla/> (raw)
In-Reply-To: <bug-27369-4717@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=27369
Gulsen Engin <gulsenenginar at aol dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |gulsenenginar at aol dot com
--- Comment #11 from Gulsen Engin <gulsenenginar at aol dot com> ---
------8<-------
1 size_t fwrite(const void * __restrict ptr, size_t size,
http://www-look-4.com/category/travel/
2 size_t nmemb, register FILE * __restrict stream)
3 {
4 size_t retval; https://komiya-dental.com/category/technology/
5 __STDIO_AUTO_THREADLOCK_VAR;
6 http://www.iu-bloomington.com/category/technology/
7 > __STDIO_AUTO_THREADLOCK(stream);
8
9 retval = fwrite_unlocked(ptr, size, nmemb, stream);
10 https://waytowhatsnext.com/category/technology/
11 __STDIO_AUTO_THREADUNLOCK(stream);
12 http://www.wearelondonmade.com/category/travel/
13 return retval;
14 }
------>8-------
http://www.jopspeech.com/category/travel/
Here, we are at line 7. Using the "next" command leads no where. However,
setting a breakpoint on line 9 and issuing "continue" works.
http://joerg.li/category/travel/
Looking at the assembly instructions reveals that we're dealing with the
critical section entry code [1] that should never be interrupted, in this
case by the debugger's implicit breakpoints:
http://connstr.net/category/travel/
------8<-------
... http://embermanchester.uk/category/travel/
1 add_s r0,r13,0x38
2 mov_s r3,1
3 llock r2,[r0] <-.
4 brne.nt r2,0,14 --. | http://www.slipstone.co.uk/category/travel/
5 scond r3,[r0] | |
6 bne -10 --|--'
7 brne_s r2,0,84 <-' http://www.logoarts.co.uk/category/travel/
...
------>8-------
http://www.acpirateradio.co.uk/category/travel/
Lines 3 until 5 (inclusive) are supposed to be executed atomically. Therefore,
GDB should never (implicitly) insert a breakpoint on lines 4 and 5, else the
http://www.compilatori.com/category/travel/
program will try to acquire the lock again by jumping back to line 3 and
gets stuck in an infinite loop. https://www.webb-dev.co.uk/category/technology/
The solution is to make GDB aware of these patterns so it inserts breakpoints
after the sequence -- line 6 in this example.
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next prev parent reply other threads:[~2021-10-09 11:00 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-08 11:32 [Bug tdep/27369] New: " shahab.vahedi at gmail dot com
2021-02-08 11:53 ` [Bug tdep/27369] " shahab.vahedi at gmail dot com
2021-02-08 12:03 ` cvs-commit at gcc dot gnu.org
2021-02-08 12:07 ` luis.machado at linaro dot org
2021-02-08 12:12 ` cvs-commit at gcc dot gnu.org
2021-02-08 12:32 ` shahab.vahedi at gmail dot com
2021-06-27 18:00 ` ahmedsayeed1982 at yahoo dot com
2021-08-19 6:01 ` ucelsanicin at yahoo dot com
2021-09-02 11:06 ` donipah907 at mtlcz dot com
2021-09-02 11:13 ` mark at klomp dot org
2021-09-06 9:09 ` focixujo at livinginsurance dot co.uk
2021-09-10 19:39 ` mehmetgelisin at aol dot com
2021-09-22 10:11 ` diheto5497 at secbuf dot com
2021-09-26 13:31 ` tes.vik1986 at gmail dot com
2021-10-09 11:00 ` gulsenenginar at aol dot com [this message]
2021-10-10 16:11 ` oficaj3 at gmail dot com
2021-10-19 7:14 ` progonsaytu at gmail dot com
2021-10-24 10:02 ` glassmtech at ukr dot net
2021-11-06 21:13 ` paneki8601 at dukeoo dot com
2021-11-16 19:08 ` xecana8007 at funboxcn dot com
2021-11-16 19:12 ` xecana8007 at funboxcn dot com
2021-11-16 19:15 ` xecana8007 at funboxcn dot com
2021-11-17 11:07 ` luis.machado at linaro dot org
2021-11-22 7:39 ` gexed96894 at keagenan dot com
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