[petsc-users] Bus Error

[Barry Smith]

> On Aug 24, 2020, at 12:39 PM, Jed Brown <jed at jedbrown.org> wrote:
> 
> 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.

But won't incorrect sizes "usually" lead to SEGV not SEGBUS?