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Groups > linux.kernel > #1600544
| From | Dmitry Vyukov <dvyukov@google.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: net: deadlock between ip_expire/sch_direct_xmit |
| Date | 2017-03-14 16:00 +0100 |
| Message-ID | <tkW5B-1Ad-65@gated-at.bofh.it> (permalink) |
| References | <tkUQb-Mo-53@gated-at.bofh.it> <tkVVU-1uM-17@gated-at.bofh.it> <tkW5z-1Ad-3@gated-at.bofh.it> <tkW5z-1Ad-1@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Tue, Mar 14, 2017 at 3:56 PM, Eric Dumazet <edumazet@google.com> wrote: > On Tue, Mar 14, 2017 at 7:46 AM, Dmitry Vyukov <dvyukov@google.com> wrote: > >> I am confused. Lockdep has observed both of these stacks: >> >> CPU0 CPU1 >> ---- ---- >> lock(&(&q->lock)->rlock); >> lock(_xmit_ETHER#2); >> lock(&(&q->lock)->rlock); >> lock(_xmit_ETHER#2); >> >> >> So it somehow happened. Or what do you mean? >> > > Lockdep said " possible circular locking dependency detected " . > It is not an actual deadlock, but lockdep machinery firing. > > For a dead lock to happen, this would require that he ICMP message > sent by ip_expire() is itself fragmented and reassembled. > This cannot be, because ICMP messages are not candidates for > fragmentation, but lockdep can not know that of course... Ah, I see. Thanks.
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net: deadlock between ip_expire/sch_direct_xmit Dmitry Vyukov <dvyukov@google.com> - 2017-03-14 14:40 +0100
Re: net: deadlock between ip_expire/sch_direct_xmit Eric Dumazet <eric.dumazet@gmail.com> - 2017-03-14 15:50 +0100
Re: net: deadlock between ip_expire/sch_direct_xmit Eric Dumazet <edumazet@google.com> - 2017-03-14 16:00 +0100
Re: net: deadlock between ip_expire/sch_direct_xmit Dmitry Vyukov <dvyukov@google.com> - 2017-03-14 16:00 +0100
Re: net: deadlock between ip_expire/sch_direct_xmit Cong Wang <xiyou.wangcong@gmail.com> - 2017-03-14 17:50 +0100
Re: net: deadlock between ip_expire/sch_direct_xmit Dmitry Vyukov <dvyukov@google.com> - 2017-03-20 11:10 +0100
Re: net: deadlock between ip_expire/sch_direct_xmit Eric Dumazet <eric.dumazet@gmail.com> - 2017-03-20 13:50 +0100
Re: net: deadlock between ip_expire/sch_direct_xmit Dmitry Vyukov <dvyukov@google.com> - 2017-03-14 16:00 +0100
Re: net: deadlock between ip_expire/sch_direct_xmit Paolo Abeni <pabeni@redhat.com> - 2017-03-14 16:10 +0100
Re: net: deadlock between ip_expire/sch_direct_xmit Eric Dumazet <edumazet@google.com> - 2017-03-14 16:20 +0100
Re: net: deadlock between ip_expire/sch_direct_xmit Paolo Abeni <pabeni@redhat.com> - 2017-03-14 16:40 +0100
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