Messages in this thread | ![/](/images/icornerl.gif) | | Subject | Re: 4.20-rc6: WARNING: CPU: 30 PID: 197360 at net/core/flow_dissector.c:764 __skb_flow_dissect | From | Christian Borntraeger <> | Date | Fri, 21 Dec 2018 07:45:37 +0100 |
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On 20.12.2018 18:23, Willem de Bruijn wrote: > On Thu, Dec 20, 2018 at 11:17 AM Ido Schimmel <idosch@idosch.org> wrote: >> >> On Thu, Dec 20, 2018 at 03:09:22PM +0100, Christian Borntraeger wrote: >>> On 20.12.2018 10:12, Ido Schimmel wrote: >>>> +Willem >>>> >>>> On Thu, Dec 20, 2018 at 08:45:40AM +0100, Christian Borntraeger wrote: >>>>> Folks, >>>>> >>>>> I got this warning today. I cant tell when and why this happened, so I do not know yet how to reproduce. >>>>> Maybe someone has a quick idea. >>>>> >>>>> [85109.572032] WARNING: CPU: 30 PID: 197360 at net/core/flow_dissector.c:764 __skb_flow_dissect+0x1f0/0x1318 >>>> >>>> I managed to trigger this warning as well the other day, but from a >>>> different call path: >>> >>> FWIW, it also seems to happen on 4.20-rc1. 4.19.0 seems fine. bisect seem to have failed so >>> my reproducer is not reliable. >> >> Yes, it is caused by commit d0e13a1488ad ("flow_dissector: lookup netns >> by skb->sk if skb->dev is NULL") >> >> $ git tag --contains d0e13a1488ad >> v4.20-rc1 >> v4.20-rc2 >> v4.20-rc3 >> v4.20-rc4 >> v4.20-rc5 >> v4.20-rc6 > > That tap_get_user_xdp path is also new for 4.20-rc1: > > commit 0efac27791ee068075d80f07c55a229b1335ce12 > tap: accept an array of XDP buffs through sendmsg() > > $ git describe --contains 0efac27791ee > v4.20-rc1~14^2~382^2~1 > > In v4.19 and before all packets went through tap_get_user.
Hmmm, so maybe my bisect wasnt broken at all? It pointed to
commit 105bc1306e9b29c2aa2783b9524f7aec9b5a5b1f Merge: 3475372ff60e4 d0e13a1488ad3 Author: David S. Miller <davem@davemloft.net> AuthorDate: Tue Sep 25 20:29:38 2018 -0700 Commit: David S. Miller <davem@davemloft.net> CommitDate: Tue Sep 25 20:29:38 2018 -0700
Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next
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