#173 3.9.40 on OS X (i386) -> xclanbsrch_pt seg fault

[Bloðøx]

xclanbsrch_pt segfaults on a OS X 32-bit build (i386 = ia32 arch).

./xclanbsrch_pt -oc res/ATL_ctGetNB_geqrf
maxN = 2508
FINDING NB FOR M=25, N=25, LDA=25:
nb=12: 381.22 979.44 759.28 --> 979.44 MFLOP.

NB refinement search:
*** i=1, nbB=12, NB=76, mul1=4, mul2=0 ***
nb=1: 610.17 620.48 623.13 --> 623.13 MFLOP.
nb=2: 780.12 786.49 790.72 --> 790.72 MFLOP.
nb=3: 871.72 890.60 897.03 --> 897.03 MFLOP.
nb=4: 953.62 925.60 967.95 --> 967.95 MFLOP.
nb=5: 924.64 953.51 958.18 --> 958.18 MFLOP.
nb=6: 618.90 973.43 969.86 --> 973.43 MFLOP.
nb=7: 989.50 1003.72 1008.30 --> 1008.30 MFLOP.
nb=8: 614.56 936.46 913.39 --> 936.46 MFLOP.
nb=9: 988.61 984.69 1004.85 --> 1004.85 MFLOP.
nb=10: 662.51 998.31 1000.06 --> 1000.06 MFLOP.
nb=11: 965.59 979.44 994.40 --> 994.40 MFLOP.
nb=12: 977.50 983.84 987.19 --> 987.19 MFLOP.
FOR M=25, N=25, LDA=25, BEST NB=7

FINDING NB FOR M=2508, N=2508, LDA=2508:
nb=76: 17750.43 --> 17750.43 MFLOP.
nb=152: 18294.10 --> 18294.10 MFLOP.
nb=228: 18384.34 --> 18384.34 MFLOP.
nb=304: 17962.58 --> 17962.58 MFLOP.
nb=380: 18022.88 --> 18022.88 MFLOP.
nb=456: 17463.22 --> 17463.22 MFLOP.
nb=532: 17348.23 --> 17348.23 MFLOP.

NB refinement search:
*** i=84, nbB=152, NB=76, mul1=8, mul2=0 ***
nb=88: 17408.39 --> 17408.39 MFLOP.
Bus error

and gdb says this:

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_PROTECTION_FAILURE at address: 0x00000000
[Switching to process 64569 thread 0x49f]
0x00000000 in ?? ()
(gdb) bt
#0 0x00000000 in ?? ()
#1 0x00096bce in ATL_cpKBmm ()

[R. Clint Whaley]

Hmm. It will be a bit before I can be definitive, but I know there are errors in the complex QR routines that ATLAS has recently started supporting. The author is debugging right now. I suspect, but do not know, that when they are fixed, it will fix this problem.

As soon as I have a fixed QR, I'll post to this bug report and ask you to try again (since the install works for us).

Many thanks,
Clint

[Bloðøx]

Clint,

thanks for looking into this. I more or less unofficially took over the responsibility of porting Atlas to the Macports project. That's why I'm reporting you all the bugs I find on each new version.

I'll be happy to test a patch as soon as you've it available.
Thanks again and have a nice Sunday
Vincent

[R. Clint Whaley]

I believe this error is fixed in 3.9.42. Can you confirm?

Thanks,
Clint

[R. Clint Whaley]

No response, assuming fixed. Reopen if problem still occurs.

[Bloðøx]

You're probably right. Sorry for overlooking this.

[R. Clint Whaley]

no response, assuming fixed.