Date: Sat, 26 Jan 2013 07:06:21 -0800 (PST) From: "Waitman Gobble" <uzimac@da3m0n8t3r.com> To: "Waitman Gobble" <uzimac@da3m0n8t3r.com> Cc: freebsd-ports@freebsd.org Subject: Re: databases/mongodb fails to start, assertion failure in unit test Message-ID: <1359212781.11261@da3m0n8t3r.com> In-Reply-To: <1359103265.5165@da3m0n8t3r.com>
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Waitman Gobble <uzimac@da3m0n8t3r.com> wrote ..
>
> Hi,
>
> I've installed databases/mongodb and get an error when starting.
>
> # /usr/local/etc/rc.d/mongod start
> Starting mongod.
> forked process: 59576
> all output going to: /var/db/mongodb/mongod.log
> /usr/local/etc/rc.d/mongod: WARNING: failed to start mongod
>
> # cat /var/db/mongodb/mongod.log
>
> Fri Jan 25 00:30:57 Assertion failure l < bigl src/mongo/db/btree.cpp 1973
> 0x5a503d 0x5eb41d 0x74dce9 0x547638 0x545ed9 0x542bc1
> 0x5a503d <_ZN5mongo12verifyFailedEPKcS1_j+285> at /usr/local/bin/mongod
> 0x5eb41d <_ZN5mongo10BTUnitTest3runEv+333> at /usr/local/bin/mongod
> 0x74dce9 <_ZN5mongo11StartupTest8runTestsEv+57> at /usr/local/bin/mongod
> 0x547638 <main+5992> at /usr/local/bin/mongod
> 0x545ed9 <main+9> at /usr/local/bin/mongod
> 0x542bc1 <_start+145> at /usr/local/bin/mongod
> Fri Jan 25 00:30:57 Got signal: 6 (Abort trap: 6).
>
>
>
> # portversion -v mongodb
> mongodb-2.2.0_1 = up-to-date with port
>
> # uname -a
> FreeBSD kamira.waitman.net 9.1-STABLE FreeBSD 9.1-STABLE #0 r245772M: Tue Jan 22
> 06:09:00 PST 2013 root@kamira.waitman.net:/usr/obj/usr/src/sys/BURPLEX amd64
>
>
> I added a couple lines to print the values before the failure.
>
>
> src/mongo/db/btree.h
>
> ..
>
> struct BTUnitTest : public StartupTest {
> void run() {
> DiskLoc big(0xf12312, 0x70001234);
> DiskLoc56Bit bigl;
> {
> bigl = big;
> verify( big == bigl );
> DiskLoc e = bigl;
> verify( big == e );
> }
> {
> DiskLoc d;
> verify( d.isNull() );
> DiskLoc56Bit l;
> l = d;
> verify( l.isNull() );
> d = l;
> verify( d.isNull() );
>
> printf("bigl %s\n",bigl.toString().c_str());
> printf("l %s\n",l.toString().c_str());
>
> verify( l < bigl );
> }
> }
> } btunittest;
> ..
>
>
> output:
>
> bigl f12312:70001234
> l null
> Thu Jan 24 23:18:17 Assertion failure l < bigl src/mongo/db/btree.cpp 1978
>
>
> looking at
> src/mongo/db/diskloc.h
>
> bool isNull() const { return _a == -1; }
> ..
> int compare(const DiskLoc& b) const {
> int x = _a - b._a;
> if ( x )
> return x;
> return ofs - b.ofs;
> }
> bool operator<(const DiskLoc& b) const {
> return compare(b) < 0;
> }
> ..
> void Null() {
> _a = -1;
> ofs = 0; /* note NullOfs is different. todo clean up. see refs to
> NullOfs in code - use is valid but outside DiskLoc context so confusing as-is.
> */
> }
>
>
>
> it seems that this should be working!
>
> test model:
>
> #include <stdio.h>
>
> int
> compare (int a, int b)
> {
> int x = a - b;
> if ( x )
> return x;
> return 555;
> }
>
> bool
> ncompare (int a, int b)
> {
> return compare(a,b) < 0;
> }
>
> int
> main (void)
> {
> int a, b;
> a = -1;
> b = 0xf12312;
> int c = a - b;
> printf("%d\n",c);
> c = compare(a,b);
> printf("%d\n",c);
> bool d = ncompare(a,b);
> printf("%d\n",d);
> bool e = ncompare(b,a);
> printf("%d\n",e);
> return 0;
> }
>
> # clang++ -o test test.cpp
> # ./test
> -15803155
> -15803155
> 1
> 0
>
>
> I'm missing something...
>
> Suggestions, tips, hints much appreciated.
>
> Thanks,
>
> --
> Waitman Gobble
> San Jose California USA
Hi,
I've tinkered around with this problem. Commenting out the 'verify( l < bigl );' line in src/mongo/db/btree.h solves the assertion failure problem, and mongodb starts and runs. However, after reviewing the code it seems this 'start' unit test is only actually testing if the thing can 'subtract integers.' I'm very puzzled as to why it is failing, it's bombing out when it does 'verify ((-1 - 0xf12312)<0)'. which seems trivial.
The code that runs the unit test/StartupTest is simple, but i haven't yet found the 'verify' macro, at least i believe it's a macro.
Anyhow, commenting out the test line gets mongodb running, but I'm wondering what other problems there could be. (?)
I found that compiling with base gcc avoids the startup problem, so this indeed seems to be an issue related to building with clang. clang builds mongodb without error, however running the mongodb compiled with clang fails during 'startuptest'.
IMHO It would be good to track down the problem, at least understand the cause, but at this moment it seems like compiling mongodb with gcc is the way to go.
I've updated the port to use the latest release/ 2.2.2 version of mongodb, I'll submit a PR in a bit, (it does not appear to have been submitted already) maybe somebody wants to use it. (The startup assertion failure affects the existing port '2.2.0' as well as 2.2.2)
--
Waitman Gobble
San Jose California USA
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