Re: [bug, 5.2.16] kswapd/compaction null pointer crash [was Re: xfs_inode not reclaimed/memory leak on 5.2.16]

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* Dave Chinner:

>> [ 4001.238446] Call Trace:
>> [ 4001.238450]  __reset_isolation_suitable+0x9b/0x120
>> [ 4001.238453]  reset_isolation_suitable+0x3b/0x40
>> [ 4001.238456]  kswapd+0x98/0x300
>> [ 4001.238460]  ? wait_woken+0x80/0x80
>> [ 4001.238463]  kthread+0x114/0x130
>> [ 4001.238465]  ? balance_pgdat+0x450/0x450
>> [ 4001.238467]  ? kthread_park+0x80/0x80
>> [ 4001.238470]  ret_from_fork+0x1f/0x30
>
> Ok, so the memory compaction code has had a null pointer dereference
> which has killed kswapd. memory reclaim is going to have serious
> problems from this point on as kswapd does most of the reclaim.

Sorry, no.  OpenVPN opened a tun device at the same time (same
second), and udevd reacted to that, but that's it.

I also double-checked, and there haven't been any recent previous
occurrences of that crash.




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