* 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.