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Re: Is KUBSAN broken?



On 31.10.2019 01:16, Kamil Rytarowski wrote:
> On 30.10.2019 14:49, SAITOH Masanobu wrote:
>>  Hi.
>>
>>  Today, I updated three amd64 machines to the latest -current and
>> all of them didn't boot. All of them use "options KUBSAN". Two of
>> them stuck at after "loading /var/db/entropy-file" and another
>> machine reset after loading the kernel. Without KUBSAN, all of the
>> machines boot.
>>
>>  OK: 2019/10/28 06:31:39
>>  NG: 2019/10/30 02:44:29
>>
> 
> I will try to reproduce it and bisect.
> 
> It looks like syzbot is down too.
> 
> https://syzkaller.appspot.com/bug?id=b439b7b09227095aec40d333565190be9272c7b6
> 

OK. The culprit reason for kUBSan breakage is GCC8 switch. If it worked
after that date, it was rather and accident and tools were not rebuilt.

I'm trying to make sense of what is going on and I will fix it.

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