* Re: Possible endless loop in lto-wrapper
[not found] <331707e8286fe9d5b7d3b5f0c83db4a7@213.92.108.204>
@ 2009-11-24 15:01 ` Rafael Espindola
0 siblings, 0 replies; 4+ messages in thread
From: Rafael Espindola @ 2009-11-24 15:01 UTC (permalink / raw)
To: Leandro Nini; +Cc: gcc
> Hi Rafael,
>
> I'm sorry I cannot try the patch until next weekend.
> However, from a first look, it should work but I wonder: if the first
> maybe_unlink_file fails the others are never reached, leaving some
> temporary files in place. Is this ok?
>
Yes, I talked with Diego and he thinks that this is an unusual case
and it is better to just give up when the first unlink fails.
I have committed the patch, let me know if you see any issues.
> Thank you,
> Leandro
> --
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>
Cheers,
--
Rafael Ávila de Espíndola
^ permalink raw reply [flat|nested] 4+ messages in thread
* Possible endless loop in lto-wrapper
@ 2009-11-22 8:54 Leandro Nini
2009-11-23 19:00 ` Rafael Espindola
0 siblings, 1 reply; 4+ messages in thread
From: Leandro Nini @ 2009-11-22 8:54 UTC (permalink / raw)
To: gcc
Hi,
in gcc-4.5 lto-wrapper may end up in an endless loop in case of error:
if for example a 'maybe_unlink_file' call from 'lto_wrapper_exit' fails it
calls 'fatal_perror' which in turn calls 'lto_wrapper_exit' again causing
an infinity of
lto-wrapper: deleting LTRANS file /tmp/ccWjXUv8.lto.o: No such file or
directory
error messages on the console.
I've solved this by substituting 'maybe_unlink_file' with
'unlink_if_ordinary'
whithin the 'lto_wrapper_exit' function.
Not sure if this is the best fix but hope it helps.
Best Regards,
Leandro
--
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Possible endless loop in lto-wrapper
2009-11-22 8:54 Leandro Nini
@ 2009-11-23 19:00 ` Rafael Espindola
2009-11-23 19:03 ` Diego Novillo
0 siblings, 1 reply; 4+ messages in thread
From: Rafael Espindola @ 2009-11-23 19:00 UTC (permalink / raw)
To: Leandro Nini; +Cc: gcc
[-- Attachment #1: Type: text/plain, Size: 1107 bytes --]
2009/11/22 Leandro Nini <drfiemost@email.it>:
> Hi,
>
> in gcc-4.5 lto-wrapper may end up in an endless loop in case of error:
>
> if for example a 'maybe_unlink_file' call from 'lto_wrapper_exit' fails it
> calls 'fatal_perror' which in turn calls 'lto_wrapper_exit' again causing
> an infinity of
>
> lto-wrapper: deleting LTRANS file /tmp/ccWjXUv8.lto.o: No such file or
> directory
>
> error messages on the console.
>
> I've solved this by substituting 'maybe_unlink_file' with
> 'unlink_if_ordinary'
> whithin the 'lto_wrapper_exit' function.
> Not sure if this is the best fix but hope it helps.
Thanks for finding the bug!
I think that we need something similar to what was done in the linker:
Avoid trying to start a new cleanup if we are already in one.
Leandro, can you try the attached patch?
Diego, OK if it works?
2009-11-23 Rafael Avila de Espindola <espindola@google.com>
* lto-wrapper.c (lto_wrapper_exit): Don't try to delete files if
being called recursively.
>
> Best Regards,
> Leandro
> --
Cheers,
--
Rafael Ávila de Espíndola
[-- Attachment #2: clean.patch --]
[-- Type: text/x-diff, Size: 861 bytes --]
Index: gcc/lto-wrapper.c
===================================================================
--- gcc/lto-wrapper.c (revision 154452)
+++ gcc/lto-wrapper.c (working copy)
@@ -66,12 +66,20 @@
static void
lto_wrapper_exit (int status)
{
- if (ltrans_output_file)
- maybe_unlink_file (ltrans_output_file);
- if (flto_out)
- maybe_unlink_file (flto_out);
- if (args_name)
- maybe_unlink_file (args_name);
+ static bool cleanup_done = false;
+ if (!cleanup_done)
+ {
+ /* Setting cleanup_done prevents an infinite loop if one of the
+ calls to maybe_unlink_file fails. */
+ cleanup_done = true;
+
+ if (ltrans_output_file)
+ maybe_unlink_file (ltrans_output_file);
+ if (flto_out)
+ maybe_unlink_file (flto_out);
+ if (args_name)
+ maybe_unlink_file (args_name);
+ }
exit (status);
}
^ permalink raw reply [flat|nested] 4+ messages in thread
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2009-11-24 15:01 ` Possible endless loop in lto-wrapper Rafael Espindola
2009-11-22 8:54 Leandro Nini
2009-11-23 19:00 ` Rafael Espindola
2009-11-23 19:03 ` Diego Novillo
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