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Subject: bug#30261: segfault on simultaneous initialization
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From: Sheheryar Parvaz <skipper308@HIDDEN>
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If the initial call to scm_with_guile is on a thread and in the main
thread at the same time, a segmentation fault occurs.
#include <pthread.h>
#include <libguile.h>
void* hello_world(void *arg) {
scm_c_eval_string("(display \"Hello World!\")");
scm_c_eval_string("(newline)");
}
void run_guile() {
scm_with_guile(&hello_world, NULL);
}
int main(int argc, char **argv) {
pthread_t th;
int ret =3D pthread_create(&th, NULL, &run_guile, NULL);
run_guile();
pthread_join(&th, NULL);
return 0;
}
Here is a backtrace of the issue.
#0 0x00007ffff7afd976 in scm_set_current_dynamic_state () from /usr/li=
b/libguile-2.2.so.1
#1 0x00007ffff7b5faec in guilify_self_2 () from /usr/lib/libguile-2.2.=
so.1
#2 0x00007ffff7b604b4 in scm_i_init_thread_for_guile () from /usr/lib/=
libguile-2.2.so.1
#3 0x00007ffff7b604f9 in with_guile () from /usr/lib/libguile-2.2.so.1
#4 0x00007ffff7281312 in GC_call_with_stack_base () from /usr/lib/libg=
c.so.1
#5 0x00007ffff7b60918 in scm_with_guile () from /usr/lib/libguile-2.2.=
so.1
#6 0x00000000004007a3 in run_guile ()
#7 0x00007ffff7893568 in start_thread (arg=3D0x7ffff5ea8700) at pthrea=
d_create.c:465
#8 0x00007ffff75cb52f in clone () at ../sysdeps/unix/sysv/linux/x86_64=
/clone.S:95
--_000_DM5PR13MB159629F5A5A3B229022C7AD4F1E00DM5PR13MB1596namp_
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=
1">
<style type=3D"text/css" style=3D"display:none;"> P {margin-top:0;margin-bo=
ttom:0;} </style>
</head>
<body dir=3D"ltr">
<div>If the initial call to scm_with_guile is on a thread and in the main</=
div>
<div>thread at the same time, a segmentation fault occurs.</div>
<div><br>
</div>
<div></div>
<div> #include <pthread.h></div>
<div> #include <libguile.h></div>
<div><br>
</div>
<div></div>
<div> void* hello_world(void *arg) {</div>
<div> scm_c_eval_string("(display=
\"Hello World!\")");</div>
<div> scm_c_eval_string("(newline=
)");</div>
<div> }</div>
<div><br>
</div>
<div></div>
<div> void run_guile() {</div>
<div> scm_with_guile(&hello_world,=
NULL);</div>
<div> }</div>
<div><br>
</div>
<div></div>
<div> int main(int argc, char **argv) {</div>
<div><br>
</div>
<div></div>
<div> pthread_t th;</div>
<div> int ret =3D pthread_create(&=
th, NULL, &run_guile, NULL);</div>
<div><br>
</div>
<div></div>
<div> run_guile();</div>
<div> pthread_join(&th, NULL);</di=
v>
<div><br>
</div>
<div></div>
<div> return 0;</div>
<div> }</div>
<div><br>
</div>
<div></div>
<div>Here is a backtrace of the issue.</div>
<div><br>
</div>
<div></div>
<div> #0 0x00007ffff7afd976 in scm_set_current_dyna=
mic_state () from /usr/lib/libguile-2.2.so.1</div>
<div> #1 0x00007ffff7b5faec in guilify_self_2 () fr=
om /usr/lib/libguile-2.2.so.1</div>
<div> #2 0x00007ffff7b604b4 in scm_i_init_thread_fo=
r_guile () from /usr/lib/libguile-2.2.so.1</div>
<div> #3 0x00007ffff7b604f9 in with_guile () from /=
usr/lib/libguile-2.2.so.1</div>
<div> #4 0x00007ffff7281312 in GC_call_with_stack_b=
ase () from /usr/lib/libgc.so.1</div>
<div> #5 0x00007ffff7b60918 in scm_with_guile () fr=
om /usr/lib/libguile-2.2.so.1</div>
<div> #6 0x00000000004007a3 in run_guile ()</div>
<div> #7 0x00007ffff7893568 in start_thread (arg=3D=
0x7ffff5ea8700) at pthread_create.c:465</div>
<div> #8 0x00007ffff75cb52f in clone () at ../sysde=
ps/unix/sysv/linux/x86_64/clone.S:95</div>
<div></div>
<div><br>
</div>
</body>
</html>
--_000_DM5PR13MB159629F5A5A3B229022C7AD4F1E00DM5PR13MB1596namp_--
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Sheheryar Parvaz <skipper308@HIDDEN> Subject: bug#30261: Acknowledgement (segfault on simultaneous initialization) Message-ID: <handler.30261.B.151698825824525.ack <at> debbugs.gnu.org> References: <DM5PR13MB159629F5A5A3B229022C7AD4F1E00@HIDDEN> X-Gnu-PR-Message: ack 30261 X-Gnu-PR-Package: guile Reply-To: 30261 <at> debbugs.gnu.org Date: Fri, 26 Jan 2018 17:38:02 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-guile@HIDDEN If you wish to submit further information on this problem, please send it to 30261 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 30261: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D30261 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
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Subject: bug#30261: segfault on simultaneous initialization
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(Sheheryar Parvaz's message of "Fri, 26 Jan 2018 17:24:11 +0000")
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Hi,
Sheheryar Parvaz <skipper308@HIDDEN> writes:
> If the initial call to scm_with_guile is on a thread and in the main
> thread at the same time, a segmentation fault occurs.
Yes, this is a known issue. At present, Guile must be fully initialized
in one thread before it can be safely used from any other thread.
Furthermore, when loading modules, you must ensure that no other thread
attempts to load or use the same module while it's being loaded. If
possible, please arrange to load all modules that your program will need
before accessing Guile from other threads.
We'd like to fix this at some point, but for various reasons it's a
non-trivial project.
Thanks,
Mark
X-Loop: help-debbugs@HIDDEN
Subject: bug#30261: segfault on simultaneous initialization
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From: Sheheryar Parvaz <skipper308@HIDDEN>
Thread-Topic: bug#30261: segfault on simultaneous initialization
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Are there any decent workarounds for this? I considered scm_init_guile, how=
ever
according to the documentation, it is non-portable. For modules, I have no =
idea how
I would initialize them.
________________________________
From: Mark H Weaver <mhw@HIDDEN>
Sent: January 26, 2018 6:41 PM
To: Sheheryar Parvaz
Cc: 30261 <at> debbugs.gnu.org
Subject: Re: bug#30261: segfault on simultaneous initialization
Hi,
Sheheryar Parvaz <skipper308@HIDDEN> writes:
> If the initial call to scm_with_guile is on a thread and in the main
> thread at the same time, a segmentation fault occurs.
Yes, this is a known issue. At present, Guile must be fully initialized
in one thread before it can be safely used from any other thread.
Furthermore, when loading modules, you must ensure that no other thread
attempts to load or use the same module while it's being loaded. If
possible, please arrange to load all modules that your program will need
before accessing Guile from other threads.
We'd like to fix this at some point, but for various reasons it's a
non-trivial project.
Thanks,
Mark
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<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
color: rgb(0, 0, 0); background-color: rgba(0, 0, 0, 0);">
Are there any decent workarounds for this? I considered scm_init_guile, how=
ever</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
color: rgb(0, 0, 0); background-color: rgba(0, 0, 0, 0);">
according to the documentation, it is non-portable. For modules, I have no =
idea how</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
color: rgb(0, 0, 0); background-color: rgba(0, 0, 0, 0);">
I would initialize them.<br>
</div>
<hr style=3D"display:inline-block;width:98%" tabindex=3D"-1">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" st=
yle=3D"font-size:11pt" color=3D"#000000"><b>From:</b> Mark H Weaver <mhw=
@netris.org><br>
<b>Sent:</b> January 26, 2018 6:41 PM<br>
<b>To:</b> Sheheryar Parvaz<br>
<b>Cc:</b> 30261 <at> debbugs.gnu.org<br>
<b>Subject:</b> Re: bug#30261: segfault on simultaneous initialization</fon=
t>
<div> </div>
</div>
<div class=3D"BodyFragment"><font size=3D"2"><span style=3D"font-size:11pt;=
">
<div class=3D"PlainText">Hi,<br>
<br>
Sheheryar Parvaz <skipper308@HIDDEN> writes:<br>
> If the initial call to scm_with_guile is on a thread and in the main<b=
r>
> thread at the same time, a segmentation fault occurs.<br>
<br>
Yes, this is a known issue. At present, Guile must be fully initializ=
ed<br>
in one thread before it can be safely used from any other thread.<br>
Furthermore, when loading modules, you must ensure that no other thread<br>
attempts to load or use the same module while it's being loaded. If<b=
r>
possible, please arrange to load all modules that your program will need<br=
>
before accessing Guile from other threads.<br>
<br>
We'd like to fix this at some point, but for various reasons it's a<br>
non-trivial project.<br>
<br>
Thanks,<br>
Mark<br>
</div>
</span></font></div>
</body>
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Subject: bug#30261: segfault on simultaneous initialization
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(Sheheryar Parvaz's message of "Sat, 27 Jan 2018 00:58:06 +0000")
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Sheheryar Parvaz <skipper308@HIDDEN> wrote:
> If the initial call to scm_with_guile is on a thread and in the main
> thread at the same time, a segmentation fault occurs.
Mark H Weaver <mhw@HIDDEN> wrote:
> Yes, this is a known issue. At present, Guile must be fully initialized
> in one thread before it can be safely used from any other thread.
> Furthermore, when loading modules, you must ensure that no other thread
> attempts to load or use the same module while it's being loaded. If
> possible, please arrange to load all modules that your program will need
> before accessing Guile from other threads.
Sheheryar Parvaz <skipper308@HIDDEN> writes:
> Are there any decent workarounds for this? I considered
> scm_init_guile, however according to the documentation, it is
> non-portable. For modules, I have no idea how I would initialize them.
The usual approach is to initialize Guile before spawning any other
threads. You can do this by calling 'scm_with_guile' early in your
'main', and then moving most of the contents of your 'main' into the
inner function that 'scm_with_guile' calls.
If there are modules that you'll need to load from your threaded code,
then load them before spawning any threads, from within the inner
function that 'scm_with_guile' calls. From C, you can load modules with
'scm_c_resolve_module'.
Mark
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