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Re: List corruption on epoll_ctl(EPOLL_CTL_DEL) an AF_UNIX socket

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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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Re: List corruption on epoll_ctl(EPOLL_CTL_DEL) an AF_UNIX socket Mathias Krause <minipli@googlemail.com> - 2015-09-29 20:20 +0200
  Re: List corruption on epoll_ctl(EPOLL_CTL_DEL) an AF_UNIX socket Jason Baron <jbaron@akamai.com> - 2015-09-29 21:20 +0200
    Re: List corruption on epoll_ctl(EPOLL_CTL_DEL) an AF_UNIX socket Mathias Krause <minipli@googlemail.com> - 2015-09-30 08:00 +0200
      Re: List corruption on epoll_ctl(EPOLL_CTL_DEL) an AF_UNIX socket Michal Kubecek <mkubecek@suse.cz> - 2015-09-30 09:40 +0200
        Re: List corruption on epoll_ctl(EPOLL_CTL_DEL) an AF_UNIX socket Jason Baron <jbaron@akamai.com> - 2015-10-01 05:00 +0200
      Re: List corruption on epoll_ctl(EPOLL_CTL_DEL) an AF_UNIX socket Rainer Weikusat <rweikusat@mobileactivedefense.com> - 2015-09-30 13:00 +0200
        Re: List corruption on epoll_ctl(EPOLL_CTL_DEL) an AF_UNIX socket Mathias Krause <minipli@googlemail.com> - 2015-09-30 14:00 +0200
          Re: List corruption on epoll_ctl(EPOLL_CTL_DEL) an AF_UNIX socket Rainer Weikusat <rweikusat@mobileactivedefense.com> - 2015-09-30 15:30 +0200
            Re: List corruption on epoll_ctl(EPOLL_CTL_DEL) an AF_UNIX socket Mathias Krause <minipli@googlemail.com> - 2015-09-30 15:40 +0200
              Re: List corruption on epoll_ctl(EPOLL_CTL_DEL) an AF_UNIX socket Rainer Weikusat <rweikusat@mobileactivedefense.com> - 2015-09-30 16:00 +0200
      Re: List corruption on epoll_ctl(EPOLL_CTL_DEL) an AF_UNIX socket Jason Baron <jbaron@akamai.com> - 2015-10-01 04:50 +0200
        Re: List corruption on epoll_ctl(EPOLL_CTL_DEL) an AF_UNIX socket Rainer Weikusat <rweikusat@mobileactivedefense.com> - 2015-10-01 12:40 +0200
          Re: List corruption on epoll_ctl(EPOLL_CTL_DEL) an AF_UNIX socket Rainer Weikusat <rweikusat@mobileactivedefense.com> - 2015-10-01 14:20 +0200
            Re: List corruption on epoll_ctl(EPOLL_CTL_DEL) an AF_UNIX socket Rainer Weikusat <rweikusat@mobileactivedefense.com> - 2015-10-01 15:00 +0200

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