Messages in this thread | | | Date | Sat, 31 Mar 2012 23:34:23 +0200 | From | Oleg Nesterov <> | Subject | Re: ipv6: tunnel: hang when destroying ipv6 tunnel |
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On 03/31, Eric Dumazet wrote: > > On Sat, 2012-03-31 at 19:51 +0200, Sasha Levin wrote: > > Hi all, > > > > It appears that a hang may occur when destroying an ipv6 tunnel, which > > I've reproduced several times in a KVM vm.
kernel version?
> > [ 1561.564172] INFO: task kworker/u:2:3140 blocked for more than 120 seconds.
And nobody else?
It would be nice to know what sysrq-t says, in particular the trace of khelper thread is interesting.
> Something is wrong here, call_usermodehelper_exec ( ... UMH_WAIT_EXEC) > should not block forever.
Yes, unless it triggers another request_module()...
Tetsuo, could you please take a look? Unlikely, but may be this is fixed by your kmod-avoid-deadlock-by-recursive-kmod-call.patch in -mm ?
Oleg.
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