On 05/12/19 12:27, Dmitry Vyukov wrote:
Oh, you mean the final bisection crash. Indeed it contains a kvm frame and it turns out to be a bug in syzkaller code that indeed misattributed it to kvm instead of netfilter. Should be fixed now, you may read the commit message for details: https://github.com/google/syzkaller/commit/4fb74474cf0af2126be3a8989d770c394...
Overall this "making sense out of kernel output" task is the ultimate insanity, you may skim through this file to get a taste of amount of hardcoding and special corner cases that need to be handled: https://github.com/google/syzkaller/blob/master/pkg/report/linux.go And this is never done, such "exception from exception corner case" things pop up every week. There is always something to shuffle and tune. It only keeps functioning due to 500+ test cases for all possible insane kernel outputs: https://github.com/google/syzkaller/tree/master/pkg/report/testdata/linux/re... https://github.com/google/syzkaller/tree/master/pkg/report/testdata/linux/gu...
So thanks for persisting and questioning! We are getting better with each new test.
Thanks to you! I "complain" because I know you're so responsive. :)
Paolo