Messages in this thread | | | Date | Tue, 13 Sep 2016 17:20:42 +0200 | From | Oleg Nesterov <> | Subject | Re: BUG_ON in rcu_sync_func triggered |
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On 09/13, Nikolay Borisov wrote: > > On 09/13/2016 05:35 PM, Nikolay Borisov wrote: > > > > On 09/13/2016 04:43 PM, Oleg Nesterov wrote: > >> On 09/13, Oleg Nesterov wrote: > >>> > >>> OK... perhaps the unbalanced up_write... I'll try to look at freeze/thaw code, > >> > >> Heh, yes, it looks racy or I am totally confused. > >> > >>> could test the debugging patch below meanwhile? > >> > >> Yes please. I'll send you another patch (hopefully fix) later, but it > >> would be nice if you can test this patch to get more info. > > > > I've already started testing with this patch on 4.4.20 this time
I think it would be better to stay with the same kernel version to debug the problem...
> Actually forget that, here is a warning that this triggered: > > [ 844.290454] WARNING: CPU: 2 PID: 1900 at kernel/rcu/sync.c:160 rcu_sync_func+0xc8/0x150() > ... > [ 844.754708] XXX: ffff88047527da78 gp=2 cnt=0 cb=1
Hmm. Thanks. Please show us all the warnings you get.
Oleg.
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