GNU logs - #53136, boring messages

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Subject: bug#53136: 28.0.90; segfault in lock_file
Resent-From: Po Lu <luangruo@HIDDEN>
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This write in `lock_file':

      memcpy (dot, replacement, replacementlen);

Ends up writing one byte outside dot.

I could not find the problem, but someone else may want to take a look.
Thanks.

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Po Lu <luangruo@HIDDEN>
Subject: bug#53136: Acknowledgement (28.0.90; segfault in lock_file)
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Subject: bug#53136: 28.0.90; segfault in lock_file
Resent-From: Eli Zaretskii <eliz@HIDDEN>
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From: Eli Zaretskii <eliz@HIDDEN>
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> Resent-From: Po Lu <luangruo@HIDDEN>
> Original-Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
> Resent-CC: bug-gnu-emacs@HIDDEN
> Resent-Sender: help-debbugs@HIDDEN
> Date: Sun, 09 Jan 2022 14:04:23 +0800
> From:  Po Lu via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
> 
> This write in `lock_file':
> 
>       memcpy (dot, replacement, replacementlen);
> 
> Ends up writing one byte outside dot.
> 
> I could not find the problem, but someone else may want to take a look.

Details, please: the values of all the relevant variables at that
point, including the contents of all the string variables.  And what
is your value of MAX_LFINFO?  I don't see how this can be efficiently
investigated without this data.  In particular, 'dot' has no storage
of its own, it's just a pointer into the lock_info.user[] array.

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#53136: 28.0.90; segfault in lock_file
Resent-From: Po Lu <luangruo@HIDDEN>
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To: Eli Zaretskii <eliz@HIDDEN>
Cc: 53136 <at> debbugs.gnu.org
From: Po Lu <luangruo@HIDDEN>
References: <871r1hv40o.fsf.ref@HIDDEN> <871r1hv40o.fsf@HIDDEN>
 <83bl0l2we3.fsf@HIDDEN>
Date: Sun, 09 Jan 2022 16:10:42 +0800
In-Reply-To: <83bl0l2we3.fsf@HIDDEN> (Eli Zaretskii's message of "Sun, 09 Jan
 2022 09:36:36 +0200")
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Eli Zaretskii <eliz@HIDDEN> writes:

>> This write in `lock_file':
>> 
>>       memcpy (dot, replacement, replacementlen);
>> 
>> Ends up writing one byte outside dot.
>> 
>> I could not find the problem, but someone else may want to take a look.

> Details, please: the values of all the relevant variables at that
> point, including the contents of all the string variables.

gdb says dot is "optimized out" (but valgrind, which I happened to be
running that Emacs under in an attempt to catch the GC bug I reported a
month ago, disagrees).  pidlen is 6.

I will try to get more information from the valgrind core file.

> And what is your value of MAX_LFINFO?

MAX_LFINFO is 8192.

> I don't see how this can be efficiently investigated without this
> data.  In particular, 'dot' has no storage of its own, it's just a
> pointer into the lock_info.user[] array.

Thanks.

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> From: Po Lu <luangruo@HIDDEN>
> Cc: 53136 <at> debbugs.gnu.org
> Date: Sun, 09 Jan 2022 16:10:42 +0800
> 
> >>       memcpy (dot, replacement, replacementlen);
> >> 
> >> Ends up writing one byte outside dot.
> >> 
> >> I could not find the problem, but someone else may want to take a look.
> 
> > Details, please: the values of all the relevant variables at that
> > point, including the contents of all the string variables.
> 
> gdb says dot is "optimized out" (but valgrind, which I happened to be
> running that Emacs under in an attempt to catch the GC bug I reported a
> month ago, disagrees).  pidlen is 6.
> 
> I will try to get more information from the valgrind core file.

Thanks.

> > And what is your value of MAX_LFINFO?
> 
> MAX_LFINFO is 8192.

So we somehow wrote more than 8192 bytes by that memcpy line?  I find
this hard to believe.

What exactly did valgrind say?

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From: Po Lu <luangruo@HIDDEN>
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Date: Sun, 09 Jan 2022 17:40:17 +0800
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Eli Zaretskii <eliz@HIDDEN> writes:

>> gdb says dot is "optimized out" (but valgrind, which I happened to be
>> running that Emacs under in an attempt to catch the GC bug I reported a
>> month ago, disagrees).  pidlen is 6.
>> 
>> I will try to get more information from the valgrind core file.

A superficial examination didn't reveal any string that made sense in
the (stack) frame of lock_file.  I will dig deeper later.

> So we somehow wrote more than 8192 bytes by that memcpy line?  I find
> this hard to believe.

Same here, I couldn't find how that happened.

> What exactly did valgrind say?

It complained about an invalid write of size 1 at one byte outside the
current stack frame.

Thanks.

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From: Po Lu <luangruo@HIDDEN>
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Date: Sun, 09 Jan 2022 19:43:47 +0800
In-Reply-To: <838rvp2tcw.fsf@HIDDEN> (Eli Zaretskii's message of "Sun, 09 Jan
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Eli Zaretskii <eliz@HIDDEN> writes:

> So we somehow wrote more than 8192 bytes by that memcpy line?  I find
> this hard to believe.

Manual inspection of the core dump seems to reveal something very
different from what the debugger said (and I asked for a second opinion
on this as well):

 - lock_info.dot and lock_info.colon are NULL.
 - lock_filename is a Lisp string, the data is
   "/home/oldosfan/Mail/archive/sent/2022-01".
 - handler, subject_buf are NULL
 - dot is NULL
 - pidlen is -1 (long int)
 - replacementlen is 6

Any ideas?  Thanks.

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> From: Po Lu <luangruo@HIDDEN>
> Cc: 53136 <at> debbugs.gnu.org
> Date: Sun, 09 Jan 2022 19:43:47 +0800
> 
>  - lock_info.dot and lock_info.colon are NULL.
>  - lock_filename is a Lisp string, the data is
>    "/home/oldosfan/Mail/archive/sent/2022-01".
>  - handler, subject_buf are NULL
>  - dot is NULL

Maybe that's the problem: it means current_lock_owner returned early
due to some error, and we are dereferencing a NULL pointer.

Paul, could you please take a look?

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> From: Po Lu <luangruo@HIDDEN>
> Cc: 53136 <at> debbugs.gnu.org
> Date: Sun, 09 Jan 2022 19:43:47 +0800
> 
> Eli Zaretskii <eliz@HIDDEN> writes:
> 
> > So we somehow wrote more than 8192 bytes by that memcpy line?  I find
> > this hard to believe.
> 
> Manual inspection of the core dump seems to reveal something very
> different from what the debugger said (and I asked for a second opinion
> on this as well):
> 
>  - lock_info.dot and lock_info.colon are NULL.
>  - lock_filename is a Lisp string, the data is
>    "/home/oldosfan/Mail/archive/sent/2022-01".
>  - handler, subject_buf are NULL
>  - dot is NULL
>  - pidlen is -1 (long int)
>  - replacementlen is 6

On second thought, these values are strange.  Is PC really at the
memcpy line?  I don't see how dot could be NULL at that point: if
lock_if_free returns a negative value, lock_info.dot cannot be NULL,
according to my reading of the code.

What is the contents of lock_info.user upto the first null byte?

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Eli Zaretskii <eliz@HIDDEN> writes:

> What is the contents of lock_info.user upto the first null byte?

It's "oldosfan" (which is correct).

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> From: Po Lu <luangruo@HIDDEN>
> Cc: 53136 <at> debbugs.gnu.org
> Date: Sun, 09 Jan 2022 21:00:53 +0800
> 
> Eli Zaretskii <eliz@HIDDEN> writes:
> 
> > What is the contents of lock_info.user upto the first null byte?
> 
> It's "oldosfan" (which is correct).

No, it's not: it should be of the form USER@HIDDEN[:BOOT-TIME].  See
the commentary around line 288 in filelock.c.  The string is generated
in lock_file_1.  maybe you can step into it and see what happens
there.

What is "oldosfan"? is it the user or the host name?

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From: Po Lu <luangruo@HIDDEN>
References: <871r1hv40o.fsf.ref@HIDDEN> <871r1hv40o.fsf@HIDDEN>
 <83bl0l2we3.fsf@HIDDEN> <87r19htjlp.fsf@HIDDEN>
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Date: Sun, 09 Jan 2022 21:16:42 +0800
In-Reply-To: <83v8yt9hrl.fsf@HIDDEN> (Eli Zaretskii's message of "Sun, 09 Jan
 2022 15:10:38 +0200")
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Eli Zaretskii <eliz@HIDDEN> writes:

> No, it's not: it should be of the form USER@HIDDEN[:BOOT-TIME].  See
> the commentary around line 288 in filelock.c.  The string is generated
> in lock_file_1.  maybe you can step into it and see what happens
> there.

Thanks, I'll look into it.

> What is "oldosfan"? is it the user or the host name?

That is my username.

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Po Lu <luangruo@HIDDEN> writes:

> Thanks, I'll look into it.

Perhaps the problem is in valgrind: when running under Valgrind, trying
to lock that file makes lock_if_free return -2147459069.

That shouldn't happen, right?  (BTW, while investigating that value, I
noticed a portability problem to Haiku, which I'll fix on the master
branch.)

Thanks.

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> From: Po Lu <luangruo@HIDDEN>
> Cc: 53136 <at> debbugs.gnu.org
> Date: Sun, 09 Jan 2022 21:23:14 +0800
> 
> Po Lu <luangruo@HIDDEN> writes:
> 
> > Thanks, I'll look into it.
> 
> Perhaps the problem is in valgrind: when running under Valgrind, trying
> to lock that file makes lock_if_free return -2147459069.
> 
> That shouldn't happen, right?

It's a strange value, no matter what.

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On Jan 09 2022, Po Lu via "Bug reports for GNU Emacs, the Swiss army knife of text editors" wrote:

> That shouldn't happen, right?  (BTW, while investigating that value, I
> noticed a portability problem to Haiku, which I'll fix on the master
> branch.)

This means Haiku is not POSIX compliant, since error numbers must be
positive.

-- 
Andreas Schwab, schwab@HIDDEN
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."

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On Jan 09 2022, Po Lu via "Bug reports for GNU Emacs, the Swiss army knife of text editors" wrote:

> That shouldn't happen, right?  (BTW, while investigating that value, I
> noticed a portability problem to Haiku, which I'll fix on the master
> branch.)

This means Haiku is not POSIX compliant, since error numbers must be
positive.

-- 
Andreas Schwab, schwab@HIDDEN
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."

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Andreas Schwab <schwab@HIDDEN> writes:

> This means Haiku is not POSIX compliant, since error numbers must be
> positive.

This bug isn't about Haiku, but yes, it's not entirely POSIX compliant.

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On 1/9/22 04:03, Eli Zaretskii wrote:

> Paul, could you please take a look?

The problem (as Po deduced) seems to be that Haiku errno values are 
negative by default.

However, I see some problems with the recently installed fix.

1. It uses BE_USE_POSITIVE_POSIX_ERRORS but Haiku spells it 
B_USE_POSITIVE_POSIX_ERRORS.

2. There's no need to replace "if (err < 0)" with "if (err == -1 || err 
== -2)", as this replacement is not needed given the "#if !defined HAIKU 
..." stuff.

3. More importantly, I'm sure there are other places where Emacs assumes 
that errno values are positive. I doubt whether it's reasonable to 
expect Emacs developers to remember and work around this Haiku 
incompatibility, every time they call a function that sets errno or 
returns an errno value. Instead, we should arrange for Haiku builds to 
use positive errno values, they way errno behaves on GNU and other 
POSIX-compatible hosts. This should be a much more maintainable solution.

Proposed patch attached.
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One little thing I noticed in the Haiku port. I assume the lisp.h 
complication for pD was needed on 32-bit Haiku to avoid compiler 
warnings when passing long vs int (same size, either would work, but 
compiler warning). I installed the attached to simplify the ifdefs here. 
If my diagnosis of the issue is wrong and this patch doesn't work for 
Haiku, please let me know or feel free to revert and we can find a 
better way.

At some point we can get rid of pD by replacing pD with "t" everywhere 
in Emacs, but one step at a time.
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From: Po Lu <luangruo@HIDDEN>
References: <871r1hv40o.fsf.ref@HIDDEN> <871r1hv40o.fsf@HIDDEN>
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Paul Eggert <eggert@HIDDEN> writes:

> On 1/9/22 04:03, Eli Zaretskii wrote:
>
>> Paul, could you please take a look?
>
> The problem (as Po deduced) seems to be that Haiku errno values are
> negative by default.

That was an unrelated problem.  This bug is on GNU/Linux, when running
under Valgrind.  (I was trying to find the GC bug from last month.)

> 1. It uses BE_USE_POSITIVE_POSIX_ERRORS but Haiku spells it
> B_USE_POSITIVE_POSIX_ERRORS.

I'll fix that.

> 2. There's no need to replace "if (err < 0)" with "if (err == -1 ||
> err == -2)", as this replacement is not needed given the "#if !defined
> HAIKU ..." stuff.

> 3. More importantly, I'm sure there are other places where Emacs
> assumes that errno values are positive. I doubt whether it's
> reasonable to expect Emacs developers to remember and work around this
> Haiku incompatibility, every time they call a function that sets errno
> or returns an errno value. Instead, we should arrange for Haiku builds
> to use positive errno values, they way errno behaves on GNU and other
> POSIX-compatible hosts. This should be a much more maintainable
> solution.

I would prefer for us to find and fix those instances manually, because
B_USE_POSITIVE_POSIX_ERRORS is some kind of stopgap measure for porting
POSIX utilities like sshfs, and prevents some other functionality from
working correctly (i.e. apparently it's an error to -ltracker with it
defined, so file dialogs won't work.)

Thanks.

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From: Po Lu <luangruo@HIDDEN>
References: <871r1hv40o.fsf.ref@HIDDEN> <871r1hv40o.fsf@HIDDEN>
 <83bl0l2we3.fsf@HIDDEN> <87r19htjlp.fsf@HIDDEN>
 <838rvp2tcw.fsf@HIDDEN> <875yqtt9qk.fsf@HIDDEN>
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Date: Tue, 11 Jan 2022 08:51:51 +0800
In-Reply-To: <ea0e0cad-df5e-9e38-3d7b-19e2f3c8a94e@HIDDEN> (Paul Eggert's
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Paul Eggert <eggert@HIDDEN> writes:

> At some point we can get rid of pD by replacing pD with "t" everywhere
> in Emacs, but one step at a time.

It works here, thanks.

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From: Po Lu <luangruo@HIDDEN>
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Paul Eggert <eggert@HIDDEN> writes:

> +    AC_DEFINE([B_USE_POSITIVE_POSIX_ERRORS], [],
> +      [Define to cause Haiku to use POSIX-compatible errno values.])

Also, for this to have a chance of working in purely tty Haiku builds,
you have to give the linker `-lposix_error_mapper'.

Maybe doing that in tty builds would be a good idea.

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Po Lu <luangruo@HIDDEN> writes:

> That was an unrelated problem.  This bug is on GNU/Linux, when running
> under Valgrind.  (I was trying to find the GC bug from last month.)

It happens with valgrind-3.18.1-7.fc35, but not valgrind-3.17.0-13.fc35.

Paul, any idea why this may be?  Thanks.

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> Date: Mon, 10 Jan 2022 15:11:04 -0800
> Cc: 53136 <at> debbugs.gnu.org, Po Lu <luangruo@HIDDEN>
> From: Paul Eggert <eggert@HIDDEN>
> 
> 3. More importantly, I'm sure there are other places where Emacs assumes 
> that errno values are positive. I doubt whether it's reasonable to 
> expect Emacs developers to remember and work around this Haiku 
> incompatibility, every time they call a function that sets errno or 
> returns an errno value. Instead, we should arrange for Haiku builds to 
> use positive errno values, they way errno behaves on GNU and other 
> POSIX-compatible hosts. This should be a much more maintainable solution.

I agree.

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> From: Po Lu <luangruo@HIDDEN>
> Cc: Eli Zaretskii <eliz@HIDDEN>,  53136 <at> debbugs.gnu.org
> Date: Tue, 11 Jan 2022 08:51:25 +0800
> 
> > 3. More importantly, I'm sure there are other places where Emacs
> > assumes that errno values are positive. I doubt whether it's
> > reasonable to expect Emacs developers to remember and work around this
> > Haiku incompatibility, every time they call a function that sets errno
> > or returns an errno value. Instead, we should arrange for Haiku builds
> > to use positive errno values, they way errno behaves on GNU and other
> > POSIX-compatible hosts. This should be a much more maintainable
> > solution.
> 
> I would prefer for us to find and fix those instances manually, because
> B_USE_POSITIVE_POSIX_ERRORS is some kind of stopgap measure for porting
> POSIX utilities like sshfs, and prevents some other functionality from
> working correctly (i.e. apparently it's an error to -ltracker with it
> defined, so file dialogs won't work.)

Ugh!

Fixing each place individually is a time bomb: no one will remember
that after enough time has passed, and we will add bugs.

The only alternative is to filter errno via some macro, which will do
nothing on all platforms but Haiku, where it will map them to Posix
values.  Butt-ugly, but it's not our fault.

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 [Sorry for the webmail, but Yahoo SMTP is wedged; I hope Reply All
worked and this reaches the bug tracker]

> Ugh!

I agree completely.

> Fixing each place individually is a time bomb: no one will remember
> that after enough time has passed, and we will add bugs.

> The only alternative is to filter errno via some macro, which will do
> nothing on all platforms but Haiku, where it will map them to Posix
> values. Butt-ugly, but it's not our fault.

Hmm, perhaps gnulib can do something in this area? Paul, any ideas?
Thanks in advance.
  
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<div>                [Sorry for the webmail, but Yahoo SMTP is wedged; I hope Reply All<br>worked and this reaches the bug tracker]<br><br>&gt; Ugh!<br><br>I agree completely.<br><br>&gt; Fixing each place individually is a time bomb: no one will remember<br>&gt; that after enough time has passed, and we will add bugs.<br><br>&gt; The only alternative is to filter errno via some macro, which will do<br>&gt; nothing on all platforms but Haiku, where it will map them to Posix<br>&gt; values.  Butt-ugly, but it&#39;s not our fault.<br><br>Hmm, perhaps gnulib can do something in this area?  Paul, any ideas?<br>Thanks in advance.<br>            </div>            
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