openldap-bugs April 2013

openldap-bugs@openldap.org

27 participants
76 discussions

(ITS#7564)
by tamas.kenez＠kishonti.net 08 Apr '13

08 Apr '13

--_000_06BD065177CD164EB234102C529395EF6483AF2AAMSPRD0311MB436_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Please cancel this issue. Reason: the mtest.c test program uses an experimental flag MDB_FIXEDMAP whi= ch causes the failure. Without the flag it works fine. --_000_06BD065177CD164EB234102C529395EF6483AF2AAMSPRD0311MB436_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable <html xmlns:v=3D"urn:schemas-microsoft-com:vml" xmlns:o=3D"urn:schemas-micr= osoft-com:office:office" xmlns:w=3D"urn:schemas-microsoft-com:office:word" = xmlns:m=3D"http://schemas.microsoft.com/office/2004/12/omml" xmlns=3D"http:= //www.w3.org/TR/REC-html40"> <head> <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"= > <meta name=3D"Generator" content=3D"Microsoft Word 14 (filtered medium)"> <style></style> </head> <body lang=3D"HU" link=3D"blue" vlink=3D"purple"> <div class=3D"WordSection1"> <p class=3D"MsoNormal"><span lang=3D"EN-US">Please cancel this issue.<o:p><= /o:p></span></p> <p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p> </o:p></span></p> <p class=3D"MsoNormal"><span lang=3D"EN-US">Reason: the mtest.c test progra= m uses an experimental flag MDB_FIXEDMAP which causes the failure.<o:p></o:= p></span></p> <p class=3D"MsoNormal"><span lang=3D"EN-US">Without the flag it works fine.= <o:p></o:p></span></p> </div> </body> </html> --_000_06BD065177CD164EB234102C529395EF6483AF2AAMSPRD0311MB436_--

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Re: (ITS#7566) ldapadd slower on Linux than BSD
by quanah＠zimbra.com 07 Apr '13

07 Apr '13

--On Saturday, April 06, 2013 1:07 PM -0600 - lidutu <lm5(a)ualberta.ca> wrote: > > > > > > > > So what is happening on the slapd server while things are paused? > > Also, if you use an ldapi:/// socket rather than a tcp/ip socket, do you > see the same issue? > > > > > A have changed to use the ldapi:/// socket and there is no improvement. > > > It seems that one thread of slapd is repeatedly waiting on epoll_wait. > Strace prints > epoll_wait(6, > > and then pauses for couple of seconds. > > > > Iotop shows to slapd threads writing to disk. Right after I start > ldapadd, they write to disk at approximately 60MB/s each. Over time, they > go down to 2-3 MB/s each. > > TID PRIO USER DISK READ DISK WRITE > SWAPIN IO COMMAND > 15264 be/4 ldap 0.00 B/s 2.81 M/s 0.00 % 99.99 % > slapd -u ldap -g ldap -f /etc/openldap/slapd.conf -h > ldapi://%2fvar%2frun%2fopenldap%2fslapd.sock > 15255 be/4 ldap 0.00 B/s 3.00 M/s 0.00 % 19.48 % > slapd -u ldap -g ldap -f /etc/openldap/slapd.conf -h > ldapi://%2fvar%2frun%2fopenldap%2fslapd.sock I noticed something similar on ubuntu10 as well. I upgraded my server to ubuntu12, and I also set /proc/sys/vm/dirty_ratio to 90 and /proc/sys/vm/dirty_expire_centisecs to 60000, and that helped significantly with back-mdb using current OpenLDAP master. An ldapadd of almost 3.5 million users takes approximately 4 hours now for my dataset vs 16. so 4x faster. --Quanah -- Quanah Gibson-Mount Sr. Member of Technical Staff Zimbra, Inc A Division of VMware, Inc. -------------------- Zimbra :: the leader in open source messaging and collaboration

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(ITS#7567) Alias dereferencing slowness
by luca.scamoni＠gruppopa.it 07 Apr '13

07 Apr '13

Full_Name: Luca Scamoni Version: 2.4.35 OS: Linux URL: ftp://www.sys-net.it/alias-deref-ITS2.tar.gz Submission from: (NULL) (78.134.117.13) Investigating alias dereferencing slowness on a customer production system I came upon a suspect behaviour with back-hdb/bdb. It seems that slapd, when dereferencing, instead of looking for the exact aliased DN, starts scanning more entries than needed (at least this is what I can tell looking to the logs set to log anything) On the customer system, with over 700,000 entries, the time taken to perform a simple search with alias dereferencing for a single entry, takes as much as performing a full ldapsearch of the entire ldap tree. To reproduce I created a small testcase (that I can't upload because there's no space left on ftp.openldap.org/incoming). The test case contains also the log and the operations performed on test data to show the issue. I tested with openldap 2.4.23, 2.4.31 and 2.4.35. The issue is present in all versions but seems to manifest itself only with back-bdb/hdb. Back-mdb seems not to show the issue (even looking at the logs) but right now, moving to back-mdb is not something the customer is ready to take. regards Luca

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Re: (ITS#7566) ldapadd slower on Linux than BSD
by lm5＠ualberta.ca 06 Apr '13

06 Apr '13

--bcaec54eef8cfe673204d9b5eb1e Content-Type: text/plain; charset=ISO-8859-1 > So what is happening on the slapd server while things are paused? > > Also, if you use an ldapi:/// socket rather than a tcp/ip socket, do you > see the same issue? > A have changed to use the ldapi:/// socket and there is no improvement. It seems that one thread of slapd is repeatedly waiting on epoll_wait. Strace prints epoll_wait(6, and then pauses for couple of seconds. Iotop shows to slapd threads writing to disk. Right after I start ldapadd, they write to disk at approximately 60MB/s each. Over time, they go down to 2-3 MB/s each. TID PRIO USER DISK READ DISK WRITE SWAPIN IO COMMAND 15264 be/4 ldap 0.00 B/s 2.81 M/s 0.00 % 99.99 % slapd -u ldap -g ldap -f /etc/openldap/slapd.conf -h ldapi://%2fvar%2frun%2fopenldap%2fslapd.sock 15255 be/4 ldap 0.00 B/s 3.00 M/s 0.00 % 19.48 % slapd -u ldap -g ldap -f /etc/openldap/slapd.conf -h ldapi://%2fvar%2frun%2fopenldap%2fslapd.sock I took an strace for all the process and threads involved over a 2 minute period. Process slapd - main thread: futex(0x7f2efa38e9d0, FUTEX_WAIT, 15251, NULL Process slapd - thread: % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 57.08 1.639877 474 3457 268 futex 42.54 1.222208 1076 1136 fdatasync 0.17 0.004913 0 272650 writev 0.11 0.003194 3 1137 pwrite 0.06 0.001736 0 272649 lseek 0.02 0.000530 0 4544 1136 read 0.01 0.000282 0 2273 write 0.00 0.000132 0 2273 sendto 0.00 0.000065 0 1136 open 0.00 0.000061 0 1136 stat 0.00 0.000041 0 1136 epoll_ctl 0.00 0.000011 0 1136 close 0.00 0.000000 0 116 mprotect 0.00 0.000000 0 2272 fcntl 0.00 0.000000 0 1136 getuid 0.00 0.000000 0 1136 getppid 0.00 0.000000 0 1136 gettid ------ ----------- ----------- --------- --------- ---------------- 100.00 2.873050 570459 1404 total Process slapd - thread: % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 50.67 1.128008 399 2828 213 futex 48.96 1.089974 1161 939 fdatasync 0.15 0.003311 0 226607 writev 0.13 0.002928 3 939 pwrite 0.07 0.001544 0 226607 lseek 0.01 0.000214 0 1879 write 0.01 0.000139 0 1879 sendto 0.00 0.000065 0 940 open 0.00 0.000046 0 3760 940 read 0.00 0.000029 0 94 mprotect 0.00 0.000021 0 940 close 0.00 0.000021 0 940 getppid 0.00 0.000019 0 940 getuid 0.00 0.000015 0 940 epoll_ctl 0.00 0.000014 0 940 stat 0.00 0.000000 0 1880 fcntl 0.00 0.000000 0 940 gettid ------ ----------- ----------- --------- --------- ---------------- 100.00 2.226348 473992 1153 total Process slapd - thread: % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- -nan 0.000000 0 1386 read -nan 0.000000 0 13861 sendto -nan 0.000000 0 3866 294 futex -nan 0.000000 0 2772 epoll_wait -nan 0.000000 0 1386 epoll_ctl ------ ----------- ----------- --------- --------- ---------------- 100.00 0.000000 23271 294 total Process ldapadd: % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 99.19 0.056533 18 3194 poll 0.48 0.000276 0 4866 read 0.32 0.000183 0 6846 write 0.00 0.000000 0 1 restart_syscall ------ ----------- ----------- --------- --------- ---------------- 100.00 0.056992 14907 total --bcaec54eef8cfe673204d9b5eb1e Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: base64 PGRpdiBkaXI9Imx0ciI+PGJyPjxkaXYgY2xhc3M9ImdtYWlsX2V4dHJhIj48ZGl2IGNsYXNzPSJn bWFpbF9xdW90ZSI+PGJsb2NrcXVvdGUgY2xhc3M9ImdtYWlsX3F1b3RlIiBzdHlsZT0ibWFyZ2lu OjBweCAwcHggMHB4IDAuOGV4O2JvcmRlci1sZWZ0OjFweCBzb2xpZCByZ2IoMjA0LDIwNCwyMDQp O3BhZGRpbmctbGVmdDoxZXgiPjxkaXYgY2xhc3M9ImltIj48L2Rpdj48ZGl2IGNsYXNzPSJpbSI+ DQoNClNvIHdoYXQgaXMgaGFwcGVuaW5nIG9uIHRoZSBzbGFwZCBzZXJ2ZXIgd2hpbGUgdGhpbmdz IGFyZSBwYXVzZWQ/PGJyPg0KPGJyPg0KQWxzbywgaWYgeW91IHVzZSBhbiBsZGFwaTovLy8gc29j a2V0IHJhdGhlciB0aGFuIGEgdGNwL2lwIHNvY2tldCwgZG8geW91IHNlZSB0aGUgc2FtZSBpc3N1 ZT88YnI+PC9kaXY+PC9ibG9ja3F1b3RlPjxkaXY+oDxicj48L2Rpdj48ZGl2PkEgaGF2ZSBjaGFu 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Re: (ITS#7566) ldapadd slower on Linux than BSD
by quanah＠zimbra.com 05 Apr '13

05 Apr '13

--On Friday, April 05, 2013 8:52 PM -0600 - lidutu <lm5(a)ualberta.ca> wrote: > > > > Hi Quanah, > > I have started doing tests with Gentoo Linux running openldap 2.4.35, > glibc 2.16 and linux kernel 3.4, 3.8 and 3.9-rc5. I have tried ext2, > ext4, reiserfs and jfs. Ldapadd is still very slow compared to BSD > regardless of the openldap backend. > > > Also a correction to the initial report: using a memory based file > system, ldapadd the whole database took 22 min. So what is happening on the slapd server while things are paused? Also, if you use an ldapi:/// socket rather than a tcp/ip socket, do you see the same issue? --Quanah -- Quanah Gibson-Mount Sr. Member of Technical Staff Zimbra, Inc A Division of VMware, Inc. -------------------- Zimbra :: the leader in open source messaging and collaboration

1 0

Re: (ITS#7566) ldapadd slower on Linux than BSD
by lm5＠ualberta.ca 05 Apr '13

05 Apr '13

--047d7b414c2ebdcec404d9a84c9d Content-Type: text/plain; charset=ISO-8859-1 Hi Quanah, I have started doing tests with Gentoo Linux running openldap 2.4.35, glibc 2.16 and linux kernel 3.4, 3.8 and 3.9-rc5. I have tried ext2, ext4, reiserfs and jfs. Ldapadd is still very slow compared to BSD regardless of the openldap backend. Also a correction to the initial report: using a memory based file system, ldapadd the whole database took 22 min. Leo On Fri, Apr 5, 2013 at 5:48 PM, Quanah Gibson-Mount <quanah(a)zimbra.com>wrote: > --On Friday, April 05, 2013 11:46 PM +0000 quanah(a)zimbra.com wrote: > > --On Friday, April 05, 2013 11:36 PM +0000 lm5(a)ualberta.ca wrote: >> >> Full_Name: Leo Mocofan >>> Version: 2.4.31 >>> OS: Debian Testing >>> URL: ftp://ftp.openldap.org/**incoming/<ftp://ftp.openldap.org/incoming/> >>> Submission from: (NULL) (129.128.11.107) >>> >> >> If you are going to test back-mdb, then you need to use a current >> OpenLDAP release (2.4.35). >> >> In any case, I don't see a bug report here? It sounds more like you're >> asking for tuning advice? I would ask what filesystem you are using >> (ext2? ext4?) etc. For ext4, I had to modify dirty_bytes to keep the >> Debian/Ubuntu flush process from killing load performance. >> > > Oh, one other note -- I advise avoiding the debian/ubuntu build versions > of BDB, if that is what you are using. They do not build BDB with the > correct configure options, seriously impacting performance. > > > --Quanah > > -- > > Quanah Gibson-Mount > Sr. Member of Technical Staff > Zimbra, Inc > A Division of VMware, Inc. > -------------------- > Zimbra :: the leader in open source messaging and collaboration > > --047d7b414c2ebdcec404d9a84c9d Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr"><div><div>Hi Quanah,<br><br></div>I have started doing tes= ts with Gentoo Linux running openldap 2.4.35, glibc 2.16 and linux kernel 3= .4, 3.8 and 3.9-rc5. I have tried ext2, ext4, reiserfs and jfs. Ldapadd is = still very slow compared to BSD regardless of the openldap backend. <br> <br></div><div>Also a correction to the initial report: using a memory base= d file system, ldapadd the whole database took 22 min.<br></div><div><br></= div>Leo<br></div><div class=3D"gmail_extra"><br><br><div class=3D"gmail_quo= te"> On Fri, Apr 5, 2013 at 5:48 PM, Quanah Gibson-Mount <span dir=3D"ltr"><<= a href=3D"mailto:quanah@zimbra.com" target=3D"_blank">quanah(a)zimbra.com</a>= ></span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0= 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> <div class=3D"im">--On Friday, April 05, 2013 11:46 PM +0000 <a href=3D"mai= lto:quanah@zimbra.com" target=3D"_blank">quanah(a)zimbra.com</a> wrote:<br> <br> </div><div class=3D"im"><blockquote class=3D"gmail_quote" style=3D"margin:0= 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> --On Friday, April 05, 2013 11:36 PM +0000 <a href=3D"mailto:lm5@ualberta.c= a" target=3D"_blank">lm5(a)ualberta.ca</a> wrote:<br> <br> <blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p= x #ccc solid;padding-left:1ex"> Full_Name: Leo Mocofan<br> Version: 2.4.31<br> OS: Debian Testing<br> URL: <a href=3D"ftp://ftp.openldap.org/incoming/" target=3D"_blank">ftp://f= tp.openldap.org/<u></u>incoming/</a><br> Submission from: (NULL) (129.128.11.107)<br> </blockquote> <br> If you are going to test back-mdb, then you need to use a current<br> OpenLDAP =A0release (2.4.35).<br> <br> In any case, I don't see a bug report here? =A0It sounds more like you&= #39;re<br> asking for tuning advice? =A0I would ask what filesystem you are using<br> (ext2? =A0ext4?) etc. =A0For ext4, I had to modify dirty_bytes to keep the<= br> Debian/Ubuntu flush process from killing load performance.<br> </blockquote> <br></div> Oh, one other note -- I advise avoiding the debian/ubuntu build versions of= BDB, if that is what you are using. =A0They do not build BDB with the corr= ect configure options, seriously impacting performance.<div class=3D"HOEnZb= "> <div class=3D"h5"><br> <br> --Quanah<br> <br> --<br> <br> Quanah Gibson-Mount<br> Sr. Member of Technical Staff<br> Zimbra, Inc<br> A Division of VMware, Inc.<br> --------------------<br> Zimbra :: =A0the leader in open source messaging and collaboration<br> <br> </div></div></blockquote></div><br></div> --047d7b414c2ebdcec404d9a84c9d--

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Re: (ITS#7566) ldapadd slower on Linux than BSD
by quanah＠zimbra.com 05 Apr '13

05 Apr '13

--On Friday, April 05, 2013 11:46 PM +0000 quanah(a)zimbra.com wrote: > --On Friday, April 05, 2013 11:36 PM +0000 lm5(a)ualberta.ca wrote: > >> Full_Name: Leo Mocofan >> Version: 2.4.31 >> OS: Debian Testing >> URL: ftp://ftp.openldap.org/incoming/ >> Submission from: (NULL) (129.128.11.107) > > If you are going to test back-mdb, then you need to use a current > OpenLDAP release (2.4.35). > > In any case, I don't see a bug report here? It sounds more like you're > asking for tuning advice? I would ask what filesystem you are using > (ext2? ext4?) etc. For ext4, I had to modify dirty_bytes to keep the > Debian/Ubuntu flush process from killing load performance. Oh, one other note -- I advise avoiding the debian/ubuntu build versions of BDB, if that is what you are using. They do not build BDB with the correct configure options, seriously impacting performance. --Quanah -- Quanah Gibson-Mount Sr. Member of Technical Staff Zimbra, Inc A Division of VMware, Inc. -------------------- Zimbra :: the leader in open source messaging and collaboration

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Re: (ITS#7566) ldapadd slower on Linux than BSD
by quanah＠zimbra.com 05 Apr '13

05 Apr '13

--On Friday, April 05, 2013 11:36 PM +0000 lm5(a)ualberta.ca wrote: > Full_Name: Leo Mocofan > Version: 2.4.31 > OS: Debian Testing > URL: ftp://ftp.openldap.org/incoming/ > Submission from: (NULL) (129.128.11.107) If you are going to test back-mdb, then you need to use a current OpenLDAP release (2.4.35). In any case, I don't see a bug report here? It sounds more like you're asking for tuning advice? I would ask what filesystem you are using (ext2? ext4?) etc. For ext4, I had to modify dirty_bytes to keep the Debian/Ubuntu flush process from killing load performance. --Quanah -- Quanah Gibson-Mount Sr. Member of Technical Staff Zimbra, Inc A Division of VMware, Inc. -------------------- Zimbra :: the leader in open source messaging and collaboration

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(ITS#7566) ldapadd slower on Linux than BSD
by lm5＠ualberta.ca 05 Apr '13

05 Apr '13

Full_Name: Leo Mocofan Version: 2.4.31 OS: Debian Testing URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (129.128.11.107) We are currently testing Linux, OpenBSD and FreeBSD to run our LDAP service. Our tests showed that Linux has great performance numbers in most of the areas but we found one test that is very slow. The database has 1 million entries and is 4.5 GB in size. Importing the whole dababase using slapadd takes minutes on all platforms. When we tried to import the database using ldapadd we noticed a huge difference: FreeBSD - 42 min, OpenBSD - 59 min, Linux - 863 min. Changing file systems for backend in Linux had no effect. Using memory based file system for the backend in Linux the time for ldapadd dropped to 3 min. Strace for ldapadd shows: write(1, "adding new entry \"uid=noname,o"..., 60) = 60 time(NULL) = 1365202241 getrusage(RUSAGE_SELF, {ru_utime={1, 684105}, ru_stime={0, 212013}, ...}) = 0 time(NULL) = 1365202241 times({tms_utime=168, tms_stime=21, tms_cutime=0, tms_cstime=0}) = 1719044914 getrusage(RUSAGE_SELF, {ru_utime={1, 684105}, ru_stime={0, 212013}, ...}) = 0 time(NULL) = 1365202241 times({tms_utime=168, tms_stime=21, tms_cutime=0, tms_cstime=0}) = 1719044914 write(4, "\27\27\27\27\17uJ,\324\324\324\324"..., 1237) = 1237 poll([{fd=4, events=POLLIN|POLLPRI}], 1, 100) = 0 (Timeout) poll([{fd=4, events=POLLIN|POLLPRI}], 1, 100) = 0 (Timeout) poll([{fd=4, events=POLLIN|POLLPRI}], 1, 100) = 0 (Timeout) poll([{fd=4, events=POLLIN|POLLPRI}], 1, 100) = 1 ([{fd=4, revents=POLLIN}]) Strace for one thread of slapd: write(12, "\27\27\27\27\17uJ,\324\324\324\324"..., 117) = 117 time([1365202241]) = 1365202241 sendto(4, "<167>Apr 5 16:50:41 slapd[4513]"..., 79, MSG_NOSIGNAL, NULL, 0) = 79 futex(0x7f36f8fd6724, FUTEX_WAIT_PRIVATE, 9166, NULL) = 0 futex(0x7f36f8fd66f8, FUTEX_WAKE_PRIVATE, 1) = 0 time(NULL) = 1365202242 read(12, "", 5) = 0 write(6, "0", 1) = 1 futex(0x7f36f8fd6724, FUTEX_WAIT_PRIVATE, 9169, NULL Strace for another thread of slapd: futex(0x7f36f8fd66f8, FUTEX_WAKE_PRIVATE, 1) = 1 time(NULL) = 1365202241 epoll_wait(7, {{EPOLLIN, {u32=4177193844, u64=139874082155380}}}, 1024, 150000) = 1 read(5, "0", 8192) = 1 time(NULL) = 1365202241 epoll_wait(7, {{EPOLLIN, {u32=4177193872, u64=139874082155408}}}, 1024, 150000) = 1 epoll_ctl(7, EPOLL_CTL_MOD, 12, {0, {u32=4177193872, u64=139874082155408}}) = 0 futex(0x7f36f8fd6724, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x7f36f8fd6720, {FUTEX_OP_SET, 0, FUTEX_OP_CMP_GT, 1}) = 1 time(NULL) = 1365202242 epoll_wait(7, {{EPOLLIN, {u32=4177193844, u64=139874082155380}}}, 1024, 150000) = 1 read(5, "0", 8192) = 1 time(NULL) = 1365202242 epoll_wait(7, {}, 1024, 150000) = 0 time(NULL) = 1365202392 epoll_wait(7, Ldapadd is stuck in poll system call, while one thread of slapd is waiting on epoll_wait(7, After couple of seconds when apparently nothing happens, then everything starts working again. Changing the database backend from to bdb to hdb and mdb doesn't seem to have an effect. We then tried to force SLAP_EVENT_WAIT to use select instead of epoll_wait on Linux and ldapadd is still much slower on Linux. We are runnin Debian testing as of Apr 5, 2013, with glibc-2.13, linux-3.2.41, libdb-5.1.29, openldap-2.4.31.

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Re: (ITS#7563) slapd modifies attribute value of pwdAttribute
by michael＠stroeder.com 05 Apr '13

05 Apr '13

Michael Ströder wrote: > Howard, please try yourself first before answering. > Dieter is right here. > > Example: > > dn: cn=Default Password Policy,ou=Policies,dc=stroeder,dc=de > changetype: modify > delete: pwdAttribute > pwdAttribute: userPassword > - > add: pwdAttribute > pwdAttribute: 2.5.4.35 > - > > Reading it: > > dn: cn=Default Password Policy,ou=Policies,dc=stroeder,dc=de > cn: Default Password Policy > [..] > pwdAttribute: userPassword > [..] > > I vaguely remember I had to implement a work-around in web2ldap to deal with > that when generating delta modification data when the user edits such an entry. BTW: This has nothing to do with replication. Howard Chu wrote before: "Also as a general rule the X.500 data model requires that a server store and return exactly what the user provided." see http://www.openldap.org/lists/openldap-technical/201303/msg00189.html Ciao, Michael.

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openldap-bugs April 2013