Re: 回复: 回复: 回复: 回复: JVM crashes constantly when High GC happens

[charlie hunt]

Just going to comment that I have seen cases of a bug in a device driver that corrupted the Java heap. The symptoms mentioned here seem very similar to the cases I have seen.

hths,

Charlie 

> On Apr 24, 2019, at 2:52 AM, Andrew Haley <aph at redhat.com> wrote:
> 
>> On 4/23/19 6:55 PM, shang xinli wrote:
>> 
>> Yes, this happens on multi machines but only on those with a
>> specific disk driver. I am thinking the device drivers which runs in
>> kernel mode could corrupt other's memory.
> 
> Yes.
> 
>> The smartctl is kicked off by command line which makes system call
>> by issuing ioctl like what I copy & pasted in last email.
>> 
>> No, we don't swap to disk.
>> 
>> There is one question I would need help before I starting
>> investigation. When a device driver servicing one user mode
>> application's system call(ioctl), can that device driver corrupt
>> other user mode application's memory(heap in our case)?  How?
> 
> Easily: the device driver doesn't run in user space, it runs in the
> kernel.
> 
> -- 
> Andrew Haley
> Java Platform Lead Engineer
> Red Hat UK Ltd. <https://www.redhat.com>
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