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Bug 1210290

Summary:	ltrace: handle_event.c:623: handle_x_sysret: Assertion `d > 0' failed
Product:	Red Hat Enterprise Linux 7	Reporter:	Petr Machata <pmachata>
Component:	ltrace	Assignee:	Jeff Law <law>
Status:	CLOSED ERRATA	QA Contact:	Martin Cermak <mcermak>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	7.2	CC:	dj, mcermak, mnewsome, ohudlick
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	In rare circumstances, when tracing a multi-threaded process without the "-f" option, secondary (untraced) threads were ignored and their stack trace was not kept up-to-date. As a consequence, ltrace terminated unexpectedly with an assertion error ("Assertion `d > 0' failed"). This bug has been fixed, and ltrace no longer crashes in the described scenario.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-11-19 03:30:33 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Petr Machata 2015-04-09 10:59:27 UTC

Description of problem:
Description of problem:
bug 1208351.

Version-Release number of selected component (if applicable):


How reproducible:
On ARM.  The nature of fix is however not arch-specific, and therefore I suspect the bug is more general, and we are just lucky that it doesn't trigger on x86_64.

Steps to Reproduce:
1. Obtain an ARM
2. Compile http://anonscm.debian.org/cgit/collab-maint/ltrace.git/tree/testsuite/ltrace.main/main-threaded.c?id=9c6ba6adc6aad1be1761b73cd34ef67d5cd5823e
3. Run ltrace -L ./a.out

Actual results:
Assertion failure.

Expected results:
It works.

Additional info:
With -f, it always works.  The problem is in ignoring non-traced threads properly.

The following upstream commits fix the problem:
http://anonscm.debian.org/cgit/collab-maint/ltrace.git/commit/?id=4724bd5a4a19db117a1d280b9d1a3508fd4e03fa
http://anonscm.debian.org/cgit/collab-maint/ltrace.git/commit/?id=72ee29639c55b5942bc07c8ed0013005f8fc5a97

Fedora package backports these as patches 20 and 21.

Comment 1 Martin Cermak 2015-04-09 13:07:08 UTC

(In reply to Petr Machata from comment #0)
> Steps to Reproduce:
> 1. Obtain an ARM
> 2. Compile
> http://anonscm.debian.org/cgit/collab-maint/ltrace.git/tree/testsuite/ltrace.
> main/main-threaded.c?id=9c6ba6adc6aad1be1761b73cd34ef67d5cd5823e

=======
#include <pthread.h>

extern void print (char *);

#define	PRINT_LOOP	10

void *
th_main (void *arg)
{
  int i;
  for (i=0; i<PRINT_LOOP; i++)
    print (arg);
  return NULL;
}

int
main ()
{
  pthread_t thread1;
  pthread_t thread2;
  pthread_t thread3;
  pthread_create (&thread1, NULL, th_main, "aaa");
  pthread_create (&thread2, NULL, th_main, "bbb");
  pthread_create (&thread3, NULL, th_main, "ccc");
  pthread_join (thread1, NULL);
  pthread_join (thread2, NULL);
  pthread_join (thread3, NULL);
  return 0;
}
=======

> 3. Run ltrace -L ./a.out

Comment 9 errata-xmlrpc 2015-11-19 03:30:33 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-2141.html