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Date:   Wed, 14 Mar 2018 00:41:20 +0300
From:   Timofey Titovets <>
Subject: Possible tcp regression in 4.14.13..26

Hi list,
We currently upgrade our servers from 4.14.13 to 4.14.26
And get some problems with random kernel oops by:
[  422.081094] BUG: unable to handle kernel NULL pointer dereference
at 0000000000000038
[  422.081254] IP: tcp_push+0x42/0x110
[  422.081314] PGD 0 P4D 0
[  422.081364] Oops: 0002 [#1] SMP PTI

Currently we assume that this caused by:
net: tcp: close sock if net namespace is exiting
[ Upstream commit 4ee806d51176ba7b8ff1efd81f271d7252e03a1d ]

If that can helps we heavy use docker and ceph rbd.

I will write if we get more info or fix that.


Have a nice day,

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