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Exact Fractional Solver SegFaults #110

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Andful opened this issue Sep 16, 2024 · 5 comments
Open

Exact Fractional Solver SegFaults #110

Andful opened this issue Sep 16, 2024 · 5 comments

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@Andful
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Andful commented Sep 16, 2024 •
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Version:

SCIP version 10.0.0 [precision: 8 byte] [memory: block] [mode: optimized] [LP solver: Soplex 7.1.0] [GitHash: 820c627c95]
Copyright (c) 2002-2024 Zuse Institute Berlin (ZIB)

External libraries: 
  Readline 8.2         GNU library for command line editing (gnu.org/s/readline)
  Soplex 7.1.0         Linear Programming Solver developed at Zuse Institute Berlin (soplex.zib.de) [GitHash: 595bfac9]
  CppAD 20180000.0     Algorithmic Differentiation of C++ algorithms developed by B. Bell (github.com/coin-or/CppAD)
  SoPlex 7.1.0         exact Linear Programming Solver developed at Zuse Institute Berlin (soplex.zib.de) [GitHash: 595bfac9]
  ZLIB 1.2.11          General purpose compression library by J. Gailly and M. Adler (zlib.net)
  MPFR 4.1.0           GNU Multiple Precision Floating-Point Reliable Library (mpfr.org)
  GMP 6.3.0            GNU Multiple Precision Arithmetic Library developed by T. Granlund (gmplib.org)
  AMPL/MP 690e9e7      AMPL .nl file reader library (github.com/ampl/mp)
  PaPILO 2.2.1         parallel presolve for integer and linear optimization (github.com/scipopt/papilo) (built with TBB)
  Nauty 2.8.8          Computing Graph Automorphism Groups by Brendan D. McKay (users.cecs.anu.edu.au/~bdm/nauty)
  sassy 1.1            Symmetry preprocessor by Markus Anders (github.com/markusa4/sassy)

user parameter file <scip.set> not found - using default parameters

The formulation in question

formulation.lp (Uploaded as TXT because GitHub complains)

The formulation solves fine when not using exact fractional, but seg-faults when using the exact fractional solver.
@ambros-gleixner
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Can you build in debug mode to see if an assert comes up? (And post the log file.)

@Andful
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Andful commented Sep 17, 2024 •
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I assume by log you mean the stdout and stderr

I got the logs with the commands:

bin/scip -c "read formulation.lp" -c "optimize" -c "quit" &> out_standard.log
bin/scip -c "set exact enabled TRUE" -c "read formulation.lp" -c "optimize" -c "quit" &> out_exact.log

out_standard.log
out_exact.log

The assertion error is:

scip: /home/andful/projects/scip/src/scip/tree.c:1953: SCIPnodeAddBoundinfer: Assertion `(boundtype == SCIP_BOUNDTYPE_LOWER && SCIPsetIsGT(set, newbound, oldlb)) || (boundtype == SCIP_BOUNDTYPE_LOWER && newbound > oldlb && newbound * oldlb <= 0.0) || (boundtype == SCIP_BOUNDTYPE_UPPER && SCIPsetIsLT(set, newbound, oldub)) || (boundtype == SCIP_BOUNDTYPE_UPPER && newbound < oldub && newbound * oldub <= 0.0)' failed.

@ambros-gleixner
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Great, do you have experience to run this in a debugger and print the backtrace and the values in the assert (boundtype, newbound, oldlb)?

@Andful
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Andful commented Sep 25, 2024

I get the following backtrace:

#0  __pthread_kill_implementation (no_tid=0, signo=6, threadid=<optimized out>)
    at ./nptl/pthread_kill.c:44
#1  __pthread_kill_internal (signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:78
#2  __GI___pthread_kill (threadid=<optimized out>, signo=signo@entry=6)
    at ./nptl/pthread_kill.c:89
#3  0x00007ffff764526e in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
#4  0x00007ffff76288ff in __GI_abort () at ./stdlib/abort.c:79
#5  0x00007ffff762881b in __assert_fail_base (
    fmt=0x7ffff77d01e8 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", 
    assertion=assertion@entry=0x5555567de140 "(boundtype == SCIP_BOUNDTYPE_LOWER && SCIPsetIsGT(set, newbound, oldlb)) || (boundtype == SCIP_BOUNDTYPE_LOWER && newbound > oldlb && newbound * oldlb <= 0.0) || (boundtype == SCIP_BOUNDTYPE_UPPER && "..., 
    file=file@entry=0x5555567dc660 "/home/andful/projects/scip/src/scip/tree.c", 
    line=line@entry=1917, 
    function=function@entry=0x5555567e31f0 <__PRETTY_FUNCTION__.113> "SCIPnodeAddBoundinfer")
    at ./assert/assert.c:94
#6  0x00007ffff763b507 in __assert_fail (
    assertion=0x5555567de140 "(boundtype == SCIP_BOUNDTYPE_LOWER && SCIPsetIsGT(set, newbound, oldlb)) || (boundtype == SCIP_BOUNDTYPE_LOWER && newbound > oldlb && newbound * oldlb <= 0.0) || (boundtype == SCIP_BOUNDTYPE_UPPER && "..., 
    file=0x5555567dc660 "/home/andful/projects/scip/src/scip/tree.c", line=1917, 
    function=0x5555567e31f0 <__PRETTY_FUNCTION__.113> "SCIPnodeAddBoundinfer")
    at ./assert/assert.c:103
#7  0x00005555561cd108 in SCIPnodeAddBoundinfer (node=0x55555a0a8078, blkmem=0x555556f5d7f0, 
    set=0x555556f5f8d0, stat=0x5555571c2c70, transprob=0x55555724ef10, 
    origprob=0x555556f6df30, tree=0x55555724ead0, reopt=0x0, lp=0x5555571cd500, 
    branchcand=0x5555571eb880, eventqueue=0x5555572ab0c0, cliquetable=0x0, 
    var=0x5555572be0d8, newbound=0, boundtype=SCIP_BOUNDTYPE_UPPER, infercons=0x0, 
    inferprop=0x0, inferinfo=0, probingchange=0)
    at /home/andful/projects/scip/src/scip/tree.c:1917
#8  0x00005555561cfc79 in SCIPnodeAddBoundchg (node=0x55555a0a8078, blkmem=0x555556f5d7f0, 
    set=0x555556f5f8d0, stat=0x5555571c2c70, transprob=0x55555724ef10, 
    origprob=0x555556f6df30, tree=0x55555724ead0, reopt=0x0, lp=0x5555571cd500, 
    branchcand=0x5555571eb880, eventqueue=0x5555572ab0c0, cliquetable=0x0, 
    var=0x5555572be0d8, newbound=0, boundtype=SCIP_BOUNDTYPE_UPPER, probingchange=0)
    at /home/andful/projects/scip/src/scip/tree.c:2488
#9  0x00005555561e0159 in SCIPtreeBranchVar (tree=0x55555724ead0, reopt=0x0, 
    blkmem=0x555556f5d7f0, set=0x555556f5f8d0, stat=0x5555571c2c70, 
    transprob=0x55555724ef10, origprob=0x555556f6df30, lp=0x5555571cd500, 
    branchcand=0x5555571eb880, eventqueue=0x5555572ab0c0, var=0x5555572be0d8, val=0, 
    downchild=0x0, eqchild=0x0, upchild=0x0)
    at /home/andful/projects/scip/src/scip/tree.c:6266
#10 0x0000555555d29201 in SCIPbranchExecPseudo (blkmem=0x555556f5d7f0, set=0x555556f5f8d0, 
    stat=0x5555571c2c70, transprob=0x55555724ef10, origprob=0x555556f6df30, 
    tree=0x55555724ead0, reopt=0x0, lp=0x5555571cd500, branchcand=0x5555571eb880, 
--Type <RET> for more, q to quit, c to continue without paging--c
    eventqueue=0x5555572ab0c0, cutoffbound=0, allowaddcons=1, result=0x7fffffffcc60)
    at /home/andful/projects/scip/src/scip/branch.c:2854
#11 0x000055555618e232 in solveNode (blkmem=0x555556f5d7f0, set=0x555556f5f8d0, 
    messagehdlr=0x555556f5aae0, stat=0x5555571c2c70, mem=0x555556f5b780, 
    origprob=0x555556f6df30, transprob=0x55555724ef10, primal=0x5555571ce630, 
    tree=0x55555724ead0, reopt=0x0, lp=0x5555571cd500, relaxation=0x55555723e9a0, 
    pricestore=0x55555726b1e0, sepastore=0x55555725b310, branchcand=0x5555571eb880, 
    cutpool=0x5555572770d0, delayedcutpool=0x555557277160, conflict=0x555556f6e7f0, 
    conflictstore=0x5555571cd2b0, eventfilter=0x555556fca780, eventqueue=0x5555572ab0c0, 
    cliquetable=0x55555724eeb0, cutoff=0x7fffffffcef4, postpone=0x7fffffffcef8, 
    unbounded=0x7fffffffcefc, infeasible=0x7fffffffcf00, restart=0x7fffffffd144, 
    afternodeheur=0x7fffffffcf08, stopped=0x7fffffffcf0c)
    at /home/andful/projects/scip/src/scip/solve.c:4748
#12 0x0000555556191122 in SCIPsolveCIP (blkmem=0x555556f5d7f0, set=0x555556f5f8d0, 
    messagehdlr=0x555556f5aae0, stat=0x5555571c2c70, mem=0x555556f5b780, 
    origprob=0x555556f6df30, transprob=0x55555724ef10, primal=0x5555571ce630, 
    tree=0x55555724ead0, reopt=0x0, lp=0x5555571cd500, relaxation=0x55555723e9a0, 
    pricestore=0x55555726b1e0, sepastore=0x55555725b310, cutpool=0x5555572770d0, 
    delayedcutpool=0x555557277160, branchcand=0x5555571eb880, conflict=0x555556f6e7f0, 
    conflictstore=0x5555571cd2b0, eventfilter=0x555556fca780, eventqueue=0x5555572ab0c0, 
    cliquetable=0x55555724eeb0, restart=0x7fffffffd144)
    at /home/andful/projects/scip/src/scip/solve.c:5316
#13 0x00005555560f5859 in SCIPsolve (scip=0x555556f5a9d0)
    at /home/andful/projects/scip/src/scip/scip_solve.c:2714
#14 0x00005555558bca7a in SCIPdialogExecOptimize (scip=0x555556f5a9d0, 
    dialog=0x555556f81ee0, dialoghdlr=0x555556f7ef90, nextdialog=0x7fffffffd300)
    at /home/andful/projects/scip/src/scip/dialog_default.c:2194
#15 0x0000555555dd1da7 in SCIPdialogExec (dialog=0x555556f81ee0, set=0x555556f5f8d0, 
    dialoghdlr=0x555556f7ef90, nextdialog=0x7fffffffd300)
    at /home/andful/projects/scip/src/scip/dialog.c:951
#16 0x0000555555dcff35 in SCIPdialoghdlrExec (dialoghdlr=0x555556f7ef90, set=0x555556f5f8d0)
    at /home/andful/projects/scip/src/scip/dialog.c:402
#17 0x0000555556099d55 in SCIPstartInteraction (scip=0x555556f5a9d0)
    at /home/andful/projects/scip/src/scip/scip_dialog.c:252
#18 0x0000555556141f6a in SCIPprocessShellArguments (scip=0x555556f5a9d0, argc=9, 
    argv=0x7fffffffd9d8, defaultsetname=0x55555664e004 "scip.set")
    at /home/andful/projects/scip/src/scip/scipshell.c:577
#19 0x0000555556142101 in SCIPrunShell (argc=9, argv=0x7fffffffd9d8, 
    defaultsetname=0x55555664e004 "scip.set")
    at /home/andful/projects/scip/src/scip/scipshell.c:633
#20 0x00005555555793cf in main (argc=9, argv=0x7fffffffd9d8)
    at /home/andful/projects/scip/src/main.c:71

and when using select-frame 7 and then info locals I get:

infervar = 0x5555ffffffff
inferboundtype = (SCIP_BOUNDTYPE_UPPER | unknown: 0x5554)
oldlb = -1e+20
oldub = 0
oldbound = 4.6355720136372173e-310
useglobal = 0
__PRETTY_FUNCTION__ = "SCIPnodeAddBoundinfer"
_restat_ = <optimized out>
_restat_ = <optimized out>
_restat_ = <optimized out>
_restat_ = <optimized out>
_restat_ = <optimized out>
_restat_ = <optimized out>
_restat_ = <optimized out>

I assume the values are:

  • boundtype = SCIP_BOUNDTYPE_UPPER
  • newbound = 0
  • oldlb = -1e+20

@Andful
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Andful commented Sep 25, 2024

I guess it is failing because oldub is 0 and newbound is 0

And it is asserted that newbound < oldub

@Andful Andful mentioned this issue Oct 8, 2024
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@ambros-gleixner @Andful