[haiku-bugs] Re: [Haiku] #9377: Network Stack Deadlock
- From: "jackburton" <trac@xxxxxxxxxxxx>
- Date: Sat, 19 Jan 2013 19:44:59 -0000
#9377: Network Stack Deadlock
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Reporter: jackburton | Owner: axeld
Type: bug | Status: new
Priority: normal | Milestone: R1
Component: Network & Internet/Stack | Version: R1/Development
Resolution: | Keywords:
Blocked By: | Blocking:
Has a Patch: 0 | Platform: All
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Description changed by jackburton:
Old description:
> Yesterday I was doing some tests with the network stack, and after a
> while, I experienced a deadlock. ifconfig was locked and couldn't be
> killed (even with kill -9). net_server was locked, too.
> I then entered KDL, and had a look at the threads involved.
> There were four threads waiting on the "net_interfaces" mutexes:
> ifconfig, net_server, and a couple I can't remember (but it's
> reproducible, so I'll try to reproduce it and save more info).
> the net_interfaces mutex was held by wpa_supplicant, which was waiting on
> the mutex of the wireless interface, which in turn was held by
> net_server.
> So I guess we have a lock inversion somewhere.
> Will add stack traces and the rest as soon as I reproduce it again.
New description:
Yesterday I was doing some tests with the network stack, and after a
while, I experienced a deadlock. ifconfig was locked and couldn't be
killed (even with kill -9). net_server was locked, too.
I then entered KDL, and had a look at the threads involved.
There was a deadlock between ifconfig and wpa_supplicant. The
net_interfaces mutex was held by wpa_supplicant, which was waiting on the
mutex of the wireless interface, which in turn was held by ifconfig.
So I guess we have a lock inversion somewhere.
It's reproducible here 100% of the times by doing:
{{{ ifconfig /dev/net/<wireless_card> down }}}
while wpa_supplicant is scanning the available networks.
I have an ipro3945 wireless card.
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Ticket URL: <http://dev.haiku-os.org/ticket/9377#comment:2>
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