Messages in this thread | | | Date | Wed, 30 Sep 2015 13:55:57 +0200 | Subject | Re: List corruption on epoll_ctl(EPOLL_CTL_DEL) an AF_UNIX socket | From | Mathias Krause <> |
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On 30 September 2015 at 12:56, Rainer Weikusat <rweikusat@mobileactivedefense.com> wrote: > Mathias Krause <minipli@googlemail.com> writes: >> On 29 September 2015 at 21:09, Jason Baron <jbaron@akamai.com> wrote: >>> However, if we call connect on socket 's', to connect to a new socket 'o2', we >>> drop the reference on the original socket 'o'. Thus, we can now close socket >>> 'o' without unregistering from epoll. Then, when we either close the ep >>> or unregister 'o', we end up with this list corruption. Thus, this is not a >>> race per se, but can be triggered sequentially. >> >> Sounds profound, but the reproducers calls connect only once per >> socket. So there is no "connect to a new socket", no? >> But w/e, see below. > > In case you want some information on this: This is a kernel warning I > could trigger (more than once) on the single day I could so far spend > looking into this (3.2.54 kernel): > > Sep 15 19:37:19 doppelsaurus kernel: WARNING: at lib/list_debug.c:53 list_del+0x9/0x30() > Sep 15 19:37:19 doppelsaurus kernel: Hardware name: 500-330nam > Sep 15 19:37:19 doppelsaurus kernel: list_del corruption. prev->next should be ffff88022c38f078, but was dead000000100100 > [snip]
Is that with Jason's patch or a vanilla v3.2.54?
Regards, Mathias
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