[petsc-users] Bus Error

[Jed Brown]

Barry Smith <bsmith at petsc.dev> writes:

>> On Aug 24, 2020, at 12:31 PM, Jed Brown <jed at jedbrown.org> wrote:
>> 
>> Barry Smith <bsmith at petsc.dev> writes:
>> 
>>>  So if a BLAS errors with SIGBUS then it is always an input error of just not proper double/complex alignment? Or some other very strange thing?
>> 
>> I would suspect memory corruption.
>
>
>   Corruption meaning what specifically?
>
>   The routines crashing are dgemv which only take double precision arrays, regardless of what garbage is in those arrays i don't think there can be BUS errors resulting. They don't take integer arrays whose corruption could result in bad indexing and then BUS errors. 
>
>   So then it can only be corruption of the pointers passed in, correct?

Such as those pointers pointing into data on the stack with incorrect sizes.