Edit report at https://bugs.php.net/bug.php?id=64836&edit=1
ID: 64836
User updated by: r dot biegel at gmx dot at
Reported by: r dot biegel at gmx dot at
Summary: segfault in softmagic.c
Status: Suspended
Type: Bug
Package: Unknown/Other Function
Operating System: Gentoo Linux
PHP Version: 5.4.15
Assigned To: ab
Block user comment: N
Private report: N
New Comment:
Shame on me, I still suffer from this crash. Somehow I confused the "-D SVN" and "-D
DAV" apache startup parameters and didn't add the SVN to the options when testing.
PHP Versions 5.3.25, 5.4.13, 5.4.14, 5.4.15 and 5.5.0_rc2 all segfault for me.
What did you mean with "TS build"? Treadsafe? I compiled php with threads enabled (at
least i specified the gentoo threads USE flag which seems to enable maintainer-zts).
Previous Comments:
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[2013-05-25 07:48:03] ab@php.net
Hi,
thanks for investing so much time in this ticket. After looking at the Gentoo
tickets
- #470828 seems to report about SVN issue in apache, PHP is only mentioned aside
- #467756 looks related to PHP, however 5.4.14. As i've mentioned, libmagic is
upgraded in 5.4.15, though one small regression was present. The crash in that
ticket is therefore most likely not relevant for 5.4.15 and later.
- The BT in this ticket isn't reproducible anymore by you, nor I could get it
crashy
Conclusion - I would suspend this bug and check when the new PHP version is out.
May be also some more info is present in the Gentoo tickets by that time.
Have a nice weekend :)
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[2013-05-23 11:04:18] r dot biegel at gmx dot at
OK, in short: I can't reproduce the segfault behaviour anymore.
Longer version:
- updated kernel from gentoo-hardened 3.8.12 to 3.9.2
- updated gcc to 4.7.3
- compiled php 5.4.13 and 5.4.14 and both work fine
- compiled php 5.4.15 again which now works fine too
- downgraded kernel and gcc to previous versions
- compiled php 5.4.15, still works
I just don't get it... I already had re-compiled php and apache before reporting as bug.
With "-D SVN" I meant the startup-arguments for apache on the command line. Don't
know if this is Gentoo specific, but it controls the loading of the svn DAV module.
At last I'd like to link these two bugs on gentoo bugzilla, which might be related:
https://bugs.gentoo.org/show_bug.cgi?id=467756
https://bugs.gentoo.org/show_bug.cgi?id=470828
Thanks for your help!
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[2013-05-21 08:00:47] ab@php.net
I've just compiled apache 2.4 with subversion 1.7.x module plus PHP-5.5, TS
build. But it still doesn't crash for me. Note that the libmagic is the same in
5.4 and 5.5 and was upgraded in 5.4.15 and 5.5.0 beta4.
To diagnose it further, is it possible you to check if the behavior is the same
with the earlier php versions? May be 5.4.14 or 5.5.0 beta3. Also i think this
behaviour is TS specific, svn might be even not the cause, too.
btw what do you mean "not using -D SVN"? As i've experienced the mod_dav_svn.so
has to be built from the subversion sources and is not contained in the apache
source tree.
Thanks.
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[2013-05-19 15:31:46] r dot biegel at gmx dot at
I used this little script to test the finfo_file function on its own. Crashes in apache (if the file
$fn exists, filetype doesn't matter), but it works on cli:
<?php
$finfo = finfo_open();
$fn = "index.html";
echo "File ".$fn." is of type ".finfo_file($finfo,$fn);
finfo_close($finfo);
?>
So it has something to do with apache i thought and it turned out that disabling SVN DAV in apache
(not using -D SVN) fixes the problem. How can I investigate further? Btw, I already upgraded from
apache 2.2 to 2.4 before my first report.
Here another (more detailed) bt:
Thread 28 (Thread 0x7fffd9feb700 (LWP 24821)):
#0 0x00007fffeeec2e6b in mget (ms=0x7fffd411c5f0, s=0x7fffd8896030 "GIF89a",
m=0x7fffd8a69268, nbytes=1218, o=0, cont_level=0, mode=32, text=0, flip=0,
recursion_level=1, printed_something=0x7fffd9fe7dd4, need_separator=0x7fffd9fe7dd8,
returnval=0x7fffd9fe7d24)
at ext/fileinfo/libmagic/softmagic.c:1610
off = 0
soffset = 410814606
offset = 0
count = 0
rv = -207172457
oneed_separator = 994741513
sbuf = 0x5cb76acd3615aac9 <Address 0x5cb76acd3615aac9 out of bounds>
rbuf = 0x8efc10f4e7cb6d6d <Address 0x8efc10f4e7cb6d6d out of bounds>
p = 0x7fffd411c660
ml = {magic = 0x180ffedff931d7c7, nmagic = 1473718312, map = 0xd8c865c8, next =
0x7fffd411c5f0, prev = 0x1a09a2a9d9c97089}
#1 0x00007fffeeebede8 in match (ms=0x7fffd411c5f0, magic=0x7fffd89170e8, nmagic=9629,
s=0x7fffd8896030 "GIF89a", nbytes=1218, offset=0, mode=32, text=0,
flip=0, recursion_level=0, printed_something=0x7fffd9fe7dd4, need_separator=0x7fffd9fe7dd8,
returnval=0x7fffd9fe7d24)
at ext/fileinfo/libmagic/softmagic.c:157
flush = 0
m = 0x7fffd8a69268
magindex = 5584
cont_level = 0
returnvalv = 0
e = -647236122
firstline = 1
print = 0
#2 0x00007fffeeebeb19 in file_softmagic (ms=0x7fffd411c5f0, buf=0x7fffd8896030 "GIF89a",
nbytes=1218, mode=32, text=0)
at ext/fileinfo/libmagic/softmagic.c:82
ml = 0x7fffd40efb50
rv = 32767
printed_something = 0
need_separator = 0
#3 0x00007fffeeebc3a5 in file_buffer (ms=0x7fffd411c5f0, stream=0x7fffd8d70388, inname=0x0,
buf=0x7fffd8896030, nb=1218)
at ext/fileinfo/libmagic/funcs.c:238
m = 0
rv = 0
looks_text = 0
mime = 16
ubuf = 0x7fffd8896030 "GIF89a"
u8buf = 0x7fffd4255aa0
ulen = 3
code = 0x0
code_mime = 0x7fffef6f618f "binary"
type = 0x7fffef6f5f84 "binary"
#4 0x00007fffeeebd698 in file_or_stream (ms=0x7fffd411c5f0, inname=0x0, stream=0x7fffd8d70388)
at ext/fileinfo/libmagic/magic.c:413
rv = -1
buf = 0x7fffd8896030 "GIF89a"
sb = {st_dev = 2058, st_ino = 105911862, st_nlink = 1, st_mode = 33188, st_uid = 81, st_gid
= 81, __pad0 = 0, st_rdev = 0, st_size = 1218,
st_blksize = 4096, st_blocks = 8, st_atim = {tv_sec = 1322087240, tv_nsec = 505034622},
st_mtim = {tv_sec = 1276182426, tv_nsec = 0}, st_ctim = {
tv_sec = 1368462842, tv_nsec = 483233520}, __unused = {0, 0, 0}}
nbytes = 1218
no_in_stream = 0
tsrm_ls = 0x7fffd40068f0
#5 0x00007fffeeebd441 in magic_stream (ms=0x7fffd411c5f0, stream=0x7fffd8d70388)
at ext/fileinfo/libmagic/magic.c:345
No locals.
#6 0x00007fffeeeae9b8 in _php_finfo_get_type (ht=2, return_value=0x7fffd49f1e50,
return_value_ptr=0x0, this_ptr=0x7fffd49f3d58, return_value_used=1,
tsrm_ls=0x7fffd40068f0, mode=2, mimetype_emu=0) at ext/fileinfo/fileinfo.c:540
stream = 0x7fffd8d70388
context = 0x7fffd8b84610
tmp2 = 0x7fffd49db410 "/xxx/yyy/zzz/fileadmin/template/head.gif"
wrap = 0x7fffefb6c700 <php_plain_files_wrapper>
ssb = {sb = {st_dev = 2058, st_ino = 105911862, st_nlink = 1, st_mode = 33188, st_uid = 81,
st_gid = 81, __pad0 = 0, st_rdev = 0, st_size = 1218,
st_blksize = 4096, st_blocks = 8, st_atim = {tv_sec = 1322087240, tv_nsec = 505034622},
st_mtim = {tv_sec = 1276182426, tv_nsec = 0},
st_ctim = {tv_sec = 1368462842, tv_nsec = 483233520}, __unused = {0, 0, 0}}}
options = 16
ret_val = 0x0
buffer = 0x7fffd49db410 "/xxx/yyy/zzz/fileadmin/template/head.gif"
buffer_len = 53
finfo = 0x7fffd49e7e08
zfinfo = 0x7fffef8234f1
zcontext = 0x0
what = 0x7fffef8234fc
mime_directory = "directory"
magic = 0x7fffd411c5f0
object = 0x7fffd49f3d58
#7 0x00007fffeeeaec40 in zif_finfo_file (ht=2, return_value=0x7fffd49f1e50, return_value_ptr=0x0,
this_ptr=0x7fffd49f3d58, return_value_used=1,
tsrm_ls=0x7fffd40068f0) at ext/fileinfo/fileinfo.c:578
No locals.
#8 0x00007fffef2f0da2 in zend_do_fcall_common_helper_SPEC (execute_data=0x7ffff7e61c98,
tsrm_ls=0x7fffd40068f0)
at Zend/zend_vm_execute.h:643
ret = 0x7ffff7e61e28
opline = 0x7fffd4903300
should_change_scope = 1 '\001'
fbc = 0x555555b0ef20
#9 0x00007fffef2f220e in ZEND_DO_FCALL_BY_NAME_SPEC_HANDLER (execute_data=0x7ffff7e61c98,
tsrm_ls=0x7fffd40068f0)
at Zend/zend_vm_execute.h:754
No locals.
(More stack frames follow...)
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[2013-05-17 15:57:47] ab@php.net
@r dot biegel at gmx dot at
Exactly, and the same way you could see with which options finfo_open() was
invoked. That were very helpful.
Thanks
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