Re: OpenDNSSEC signer engine: Bus error: How to get debug information?
Hi All, By the way, I just wanted to say how great this is. I have problem, I ask for help, I get (good) help. With relative easy I can build the necessary debugging tool and use it to find out that the OS has helped to identify a problem in the application. Pretty nice and not necessarily my everyday experience in IT. Thanks again. Cheers, Robb.
Re: OpenDNSSEC signer engine: Bus error: How to get debug information?
> > #1 0x084fca6e4e55 in ixfr_del_rr (ixfr=0x852782d0d80, > > rr=0xdfdfdfdfdfdfdfdf) at signer/ixfr.c:134 > this is a use after free > damn right
Re: OpenDNSSEC signer engine: Bus error: How to get debug information?
On Tue, Sep 22, 2020 at 04:08:16PM +0200, Why 42? The lists account. wrote: > > On Tue, Sep 22, 2020 at 07:12:47AM -, Stuart Henderson wrote: > > Sounds like they are trapping sigbus themselves but the handler isn't > > giving useful information. > > > > Try just running it under gdb: > > pkg_add gdb > > egdb ods-signerd > > set args -dv > > run > > > > and see if you can get a backtrace. You may need to build opendnssec > > with debug symbols to get a usable trace though (checkout the ports > > tree and build it with "make DEBUG=-g repackage reinstall"). > > Hi Stuart, > > Thanks for that, concise and really helpful. The debug build process was > easier than I expected :). > > For what is worth the results in egdb are: > Thread 2 received signal SIGBUS, Bus error. > [Switching to thread 478985] > 0x0851fb90f5f5 in ldns_rr_clone () from /usr/local/lib/libldns.so.7.1 > (gdb) bt > #0 0x0851fb90f5f5 in ldns_rr_clone () from /usr/local/lib/libldns.so.7.1 > #1 0x084fca6e4e55 in ixfr_del_rr (ixfr=0x852782d0d80, > rr=0xdfdfdfdfdfdfdfdf) at signer/ixfr.c:134 this is a use after free > #2 0x084fca6ea0da in rrset_sign (ctx=0x8522842d800, rrset= out>, signtime=1600781131) at signer/rrset.c:758 > #3 0x084fca6ddd6c in drudge (worker=0x8521a9e4000) at > daemon/signertasks.c:196 > #4 0x084fca714e0b in runthread (data=0x851d1fc6300) at janitor.c:318 > #5 0x0852553ad0d1 in _rthread_start (v=) at > /usr/src/lib/librthread/rthread.c:96 > #6 0x0851f742dc38 in __tfork_thread () at > /usr/src/lib/libc/arch/amd64/sys/tfork_thread.S:77 > #7 0x in ?? () > (gdb) info args > No symbol table info available. > (gdb) info local > No symbol table info available. > (gdb) up > #1 0x084fca6e4e55 in ixfr_del_rr (ixfr=0x852782d0d80, > rr=0xdfdfdfdfdfdfdfdf) at signer/ixfr.c:134 > 134 ldns_rr* rr_copy = ldns_rr_clone(rr); > (gdb) info args > ixfr = 0x852782d0d80 > rr = 0xdfdfdfdfdfdfdfdf > (gdb) info local > rr_copy = > > I'm not a gdb expert, but I wonder why it says "No symbol table info > available" ... > > In any case, I've forwarded the info. on to the opendnssec developer > list. > > Thanks again. > > Cheers, > Robb. > -- I'm not entirely sure you are real.
Re: OpenDNSSEC signer engine: Bus error: How to get debug information?
On Tue, Sep 22, 2020 at 07:12:47AM -, Stuart Henderson wrote: > Sounds like they are trapping sigbus themselves but the handler isn't > giving useful information. > > Try just running it under gdb: > pkg_add gdb > egdb ods-signerd > set args -dv > run > > and see if you can get a backtrace. You may need to build opendnssec > with debug symbols to get a usable trace though (checkout the ports > tree and build it with "make DEBUG=-g repackage reinstall"). Hi Stuart, Thanks for that, concise and really helpful. The debug build process was easier than I expected :). For what is worth the results in egdb are: Thread 2 received signal SIGBUS, Bus error. [Switching to thread 478985] 0x0851fb90f5f5 in ldns_rr_clone () from /usr/local/lib/libldns.so.7.1 (gdb) bt #0 0x0851fb90f5f5 in ldns_rr_clone () from /usr/local/lib/libldns.so.7.1 #1 0x084fca6e4e55 in ixfr_del_rr (ixfr=0x852782d0d80, rr=0xdfdfdfdfdfdfdfdf) at signer/ixfr.c:134 #2 0x084fca6ea0da in rrset_sign (ctx=0x8522842d800, rrset=, signtime=1600781131) at signer/rrset.c:758 #3 0x084fca6ddd6c in drudge (worker=0x8521a9e4000) at daemon/signertasks.c:196 #4 0x084fca714e0b in runthread (data=0x851d1fc6300) at janitor.c:318 #5 0x0852553ad0d1 in _rthread_start (v=) at /usr/src/lib/librthread/rthread.c:96 #6 0x0851f742dc38 in __tfork_thread () at /usr/src/lib/libc/arch/amd64/sys/tfork_thread.S:77 #7 0x in ?? () (gdb) info args No symbol table info available. (gdb) info local No symbol table info available. (gdb) up #1 0x084fca6e4e55 in ixfr_del_rr (ixfr=0x852782d0d80, rr=0xdfdfdfdfdfdfdfdf) at signer/ixfr.c:134 134 ldns_rr* rr_copy = ldns_rr_clone(rr); (gdb) info args ixfr = 0x852782d0d80 rr = 0xdfdfdfdfdfdfdfdf (gdb) info local rr_copy = I'm not a gdb expert, but I wonder why it says "No symbol table info available" ... In any case, I've forwarded the info. on to the opendnssec developer list. Thanks again. Cheers, Robb.
Re: OpenDNSSEC signer engine: Bus error: How to get debug information?
On 2020-09-21, Why 42? The lists account. wrote: > > Hi All, > > I am attempting to setup secure DNS on an OpenBSD 6.7 system using NSD, > Unbound and a package called Opendnssec. > > I seem to have arrived at a point where one of the Opendnssec daemons, > "ods-signerd", crashes on startup i.e. >> # ods-signerd -dv >> OpenDNSSEC signer engine version 2.1.6 >> Bus error in ldns_rr_clone >> Threaddump >> Threaddump >> Threaddump >> Threaddump >> Threaddump >> Threaddump >> Threaddump >> Threaddump >> Threaddump >> Threaddump >> Bus error > > I'm not sure exactly what Threaddump means but, as far as I can tell, no > core file is dumped/written. Sounds like they are trapping sigbus themselves but the handler isn't giving useful information. Try just running it under gdb: pkg_add gdb egdb ods-signerd set args -dv run and see if you can get a backtrace. You may need to build opendnssec with debug symbols to get a usable trace though (checkout the ports tree and build it with "make DEBUG=-g repackage reinstall").
OpenDNSSEC signer engine: Bus error: How to get debug information?
Hi All, I am attempting to setup secure DNS on an OpenBSD 6.7 system using NSD, Unbound and a package called Opendnssec. I seem to have arrived at a point where one of the Opendnssec daemons, "ods-signerd", crashes on startup i.e. > # ods-signerd -dv > OpenDNSSEC signer engine version 2.1.6 > Bus error in ldns_rr_clone > Threaddump > Threaddump > Threaddump > Threaddump > Threaddump > Threaddump > Threaddump > Threaddump > Threaddump > Threaddump > Bus error I'm not sure exactly what Threaddump means but, as far as I can tell, no core file is dumped/written. Is there something I can/should do in order to enable a core dump, or to gather some more debug info. that I can pass on to the Opendnssec developers? Alternatively, if anyone has any ideas about what could be causing the problem, or how to avoid it, that would be even better :-). The other daemon started by Opendnssec seems to be running "as expected" e.g. > # ps aux | grep ods > _opendns 67028 0.0 1.1 24140 33728 ?? I7Sep209:02.01 > /usr/local/sbin/ods-enforcerd Thanks in advance! Cheers, Robb.
