Messages in this thread |  | | | Date | Wed, 8 Dec 2010 15:08:22 +0100 | | From | Oleg Nesterov <> | | Subject | Re: [regression, 2.6.37-rc1] 'ip link tap0 up' stuck in do_exit() |
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On 12/08, Oleg Nesterov wrote: > > On 12/08, Oleg Nesterov wrote: > > > > On 12/08, Florian Mickler wrote: > > > > > > [ ccing Ingo and Oleg ] as suggested > > > > Well. Of course I can't explain this bug. But, looking at this email > > I do not see amything strange in exit/schedule/etc. > > > > > > >> > > > This is resulting in the command 'ip link set tap0 up' hanging as a zombie: > > > > >> > > > > > > > >> > > > root 3005 1 0 16:53 pts/3 00:00:00 /bin/sh /vm-images/qemu-ifup tap0 > > > > >> > > > root 3011 3005 0 16:53 pts/3 00:00:00 /usr/bin/sudo /sbin/ip link set tap0 up > > > > >> > > > root 3012 3011 0 16:53 pts/3 00:00:00 [ip] <defunct> > > > > That is. ip is a zombie. > > And. I do not know if this matters or not, but "the command 'ip link > set tap0 up' hanging as a zombie" does not look right. > > This was spawned by > > > >> > > > if [ -n "$1" ];then > > >> > > > /usr/bin/sudo /sbin/ip link set $1 up > > >> > > > sleep 0.5s > > >> > > > /usr/bin/sudo /usr/sbin/brctl addif $switch $1 > > >> > > > exit 0 > > >> > > > fi > > The command does not hang. But it forks the child with pid == 3012, > this child exits.
Damn, sorry for noise, forgot to mention...
The parent's trace (pid == 3011) can be more useful. Say, if it hangs in do_wait(), then the kernel is obviously wrong.
Oleg.
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