Re: [PATCH v4 0/7] fuzz: improve crash case minimization

[Alexander Bulekov <alxndr@bu.edu>]

On 201229 1239, Qiuhao Li wrote:
> Extend and refine the crash case minimization process.
> 

Hi Qiuhao,
For this whole series:
Tested-by: Alexander Bulekov <alxndr@bu.edu>

Thank you for this effort! -  it is a big improvement over what we had.
-Alex

> Test input:
>   Bug 1909261 full_reproducer
>   6500 QTest instructions (write mostly)
> 
> Refined (-M1 minimization level) vs. Original version:
>   real  38m31.942s  <-- real  532m57.192s
>   user  28m18.188s  <-- user  89m0.536s
>   sys   12m42.239s  <-- sys   50m33.074s
>   2558 instructions <-- 2846 instructions
> 
> Test Enviroment:
>   i7-8550U, 16GB LPDDR3, SSD 
>   Ubuntu 20.04.1 5.4.0-58-generic x86_64
>   Python 3.8.5
> 
> v4:
>   Fix: messy diff in [PATCH v3 4/7]
> 
> v3:
>   Fix: checkpatch.pl errors
> 
> v2: 
>   New: [PATCH v2 1/7]
>   New: [PATCH v2 2/7]
>   New: [PATCH v2 4/7]
>   New: [PATCH v2 6/7]
>   New: [PATCH v2 7/7]
>   Fix: [PATCH 2/4] split using binary approach
>   Fix: [PATCH 3/4] typo in comments
>   Discard: [PATCH 1/4] the hardcoded regex match for crash detection
>   Discard: [PATCH 4/4] the delaying minimizer
>   
> Thanks for the suggestions from:
>   Alexander Bulekov
> 
> Qiuhao Li (7):
>   fuzz: accelerate non-crash detection
>   fuzz: double the IOs to remove for every loop
>   fuzz: split write operand using binary approach
>   fuzz: loop the remove minimizer and refactoring
>   fuzz: set bits in operand of write/out to zero
>   fuzz: add minimization options
>   fuzz: heuristic split write based on past IOs
> 
>  scripts/oss-fuzz/minimize_qtest_trace.py | 257 ++++++++++++++++++-----
>  1 file changed, 209 insertions(+), 48 deletions(-)
> 
> -- 
> 2.25.1
>