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On 02/20/2014 11:00 AM, Lukas Slebodnik wrote:
ehlo,
It was not easy to reproduce this crash in the find-uid-test (log
attached)
Here is a backtrace: #0 0x00007fbeaf7850cf in
_IO_vfprintf_internal (s=<optimized out>, format=<optimized out>,
ap=<optimized out>) at vfprintf.c:1635 #1 0x00007fbeaf788b01 in
buffered_vfprintf (s=s@entry=0x7fbeafaf51c0 <_IO_2_1_stderr_>,
format=format@entry=0x7fbeb119c1a8 "Proc file [%s] is not available
anymore, continuing.\n", args=args@entry=0x7fff2d20b668) at
vfprintf.c:2328 #2 0x00007fbeaf783ffe in _IO_vfprintf_internal
(s=s@entry=0x7fbeafaf51c0 <_IO_2_1_stderr_>, format=0x7fbeb119c1a8
"Proc file [%s] is not available anymore, continuing.\n",
ap=0x7fff2d20b668) at vfprintf.c:1289 #3 0x00007fbeaf840a06 in
___vfprintf_chk (fp=0x7fbeafaf51c0 <_IO_2_1_stderr_>, flag=1,
format=<optimized out>, ap=<optimized out>) at vfprintf_chk.c:33 #4
0x00007fbeb0d7461a in debug_fn (file=file@entry=0x7fbeb119bfcf
"src/util/find_uid.c", line=line@entry=90,
function=function@entry=0x7fbeb119c270 <__FUNCTION__.8600>
"get_uid_from_pid", level=level@entry=4096,
format=format@entry=0x7fbeb119c1a8 "Proc file [%s] is not available
anymore, continuing.\n") at src/util/debug.c:257 #5
0x00007fbeb119ae74 in get_uid_from_pid (pid=<optimized out>,
uid=uid@entry=0x7fff2d20c9a4) at src/util/find_uid.c:88 #6
0x00007fbeb119b381 in get_active_uid_linux (table=table@entry=0x0,
search_uid=search_uid@entry=4294967292) at src/util/find_uid.c:236
#7 0x00007fbeb119b69f in check_if_uid_is_active
(uid=uid@entry=4294967292, result=result@entry=0x7fff2d20ca67) at
src/util/find_uid.c:333 #8 0x00007fbeb119a9ab in
test_check_if_uid_is_active_fail (_i=<optimized out>) at
src/tests/find_uid-tests.c:58 #9 0x00007fbeb054887e in
tcase_run_tfun_fork (i=0, tfun=0x7fbeb14a0300, tc=0x7fbeb14a00a0,
sr=0x7fbeb14a0390) at check_run.c:396 #10
srunner_iterate_tcase_tfuns (tc=0x7fbeb14a00a0, sr=0x7fbeb14a0390)
at check_run.c:181 #11 srunner_run_tcase (tc=0x7fbeb14a00a0,
sr=0x7fbeb14a0390) at check_run.c:313 #12 srunner_iterate_suites
(print_mode=CK_SILENT, tcname=0x0, sname=0x0, sr=0x7fbeb14a0390) at
check_run.c:156 #13 srunner_run (sr=sr@entry=0x7fbeb14a0390,
sname=sname@entry=0x0, tcname=tcname@entry=0x0,
print_mode=print_mode@entry=CK_ENV) at check_run.c:618 #14
0x00007fbeb054892b in srunner_run_all (sr=sr@entry=0x7fbeb14a0390,
print_mode=print_mode@entry=CK_ENV) at check_run.c:587 #15
0x00007fbeb119a685 in main () at src/tests/find_uid-tests.c:125
(gdb) l src/util/find_uid.c:88 83 84 fd = open(path,
O_RDONLY); 85 if (fd == -1) { 86 error =
errno; 87 if (error == ENOENT) { 88
DEBUG(SSSDBG_TRACE_LIBS, 89 "Proc file [%s]
is not available anymore, continuing.\n", 90
path); 91 return EOK; 92 }
As you can see in frame 5, it was caused by DEBUG macro. It was
strange because variable path was declared on stack "char
path[PATHLEN];"
But it looks like va_list should not be used twice.
http://en.cppreference.com/w/cpp/utility/variadic/va_copy
It is really difficult to reproduce it. I was not able to reproduce
problem on fedora 19 or rawhide
http://koji.fedoraproject.org/koji/taskinfo?taskID=6551367
http://koji.fedoraproject.org/koji/taskinfo?taskID=6551377
and only sometimes on fedora 20 x86_64
http://koji.fedoraproject.org/koji/taskinfo?taskID=6551997 --works
http://koji.fedoraproject.org/koji/taskinfo?taskID=6551349
--doesn't work
Patch is attached.
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