Messages in this thread | | | From | Sasha Levin <> | Date | Sat, 31 Mar 2012 23:43:19 +0200 | Subject | Re: ipv6: tunnel: hang when destroying ipv6 tunnel |
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On Sat, Mar 31, 2012 at 11:34 PM, Oleg Nesterov <oleg@redhat.com> wrote: > 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?
latest linux-next
>> > [ 1561.564172] INFO: task kworker/u:2:3140 blocked for more than 120 seconds. > > And nobody else?
Some more messages follow a bit later which get stuck in vfs related code.
> It would be nice to know what sysrq-t says, in particular the trace > of khelper thread is interesting.
Sure, I'll get one when it happens again.
>> 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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