[petsc-users] KSP_Solve crashes in debug mode

[Matthew Knepley]

On Thu, Feb 9, 2023 at 6:05 PM Sajid Ali Syed via petsc-users <
petsc-users at mcs.anl.gov> wrote:

> I added “-malloc_debug” in a .petscrc file and ran it again. The backtrace
> from lldb is in the attached file. The crash now seems to be at:
>
> Process 32660 stopped* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=2, address=0x16f603fb8)
>     frame #0: 0x0000000112ecc8f8 libpetsc.3.018.dylib`PetscFPrintf(comm=0, fd=0x0000000000000000, format=0x0000000000000000) at mprint.c:601
>    598               `PetscViewerASCIISynchronizedPrintf()`, `PetscSynchronizedFlush()`
>    599      @*/
>    600      PetscErrorCode PetscFPrintf(MPI_Comm comm, FILE *fd, const char format[], ...)
> -> 601      {
>    602       PetscMPIInt rank;
>    603
>    604       PetscFunctionBegin;
> (lldb) frame info
> frame #0: 0x0000000112ecc8f8 libpetsc.3.018.dylib`PetscFPrintf(comm=0, fd=0x0000000000000000, format=0x0000000000000000) at mprint.c:601
> (lldb)
>
> The trace seems to indicate some sort of infinite loop causing an overflow.
>

Yes, I have also seen this. What happens is that we have a memory error.
The error is reported inside PetscMallocValidate()
using PetscErrorPrintf, which eventually calls PetscCallMPI, which calls
PetscMallocValidate again, which fails. We need to
remove all error checking from the prints inside Validate.

  Thanks,

     Matt


> PS: I'm using a arm64 mac, so I don't have access to valgrind.
>
> Thank You,
> Sajid Ali (he/him) | Research Associate
> Scientific Computing Division
> Fermi National Accelerator Laboratory
> s-sajid-ali.github.io
>


-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener

https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
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