Re: lost connection to test machine (4)

2018-02-14 Thread Dennis Zhou
On Mon, Feb 12, 2018 at 06:00:13PM +0100, Daniel Borkmann wrote: > > [ +Dennis, +Tejun ] > > Looks like we're stuck in percpu allocator with key/value size of 4 bytes > each and large number of entries (max_entries) in the reproducer in above > link. > > Could we have some __GFP_NORETRY semantic

Re: lost connection to test machine (4)

2018-02-13 Thread Dennis Zhou
On Tue, Feb 13, 2018 at 09:49:27AM -0800, Eric Dumazet wrote: > On Tue, 2018-02-13 at 11:34 -0600, Dennis Zhou wrote: > > Hi Eric, > > > > On Tue, Feb 13, 2018 at 05:35:26AM -0800, Eric Dumazet wrote: > > > > > > Also I would consider using this fix as I had warnings of cpus being > > > stuck the

Re: lost connection to test machine (4)

2018-02-13 Thread Eric Dumazet
On Tue, 2018-02-13 at 11:34 -0600, Dennis Zhou wrote: > Hi Eric, > > On Tue, Feb 13, 2018 at 05:35:26AM -0800, Eric Dumazet wrote: > > > > Also I would consider using this fix as I had warnings of cpus being > > stuck there for more than 50 ms : > > > > > > diff --git a/mm/percpu-vm.c b/mm/perc

Re: lost connection to test machine (4)

2018-02-13 Thread Dennis Zhou
Hi Eric, On Tue, Feb 13, 2018 at 05:35:26AM -0800, Eric Dumazet wrote: > > Also I would consider using this fix as I had warnings of cpus being > stuck there for more than 50 ms : > > > diff --git a/mm/percpu-vm.c b/mm/percpu-vm.c > index > 9158e5a81391ced4e268e3d5dd9879c2bc7280ce..6309b01ceb3

Re: lost connection to test machine (4)

2018-02-13 Thread Eric Dumazet
On Mon, 2018-02-12 at 12:05 -0800, Tejun Heo wrote: > On Mon, Feb 12, 2018 at 09:03:25AM -0800, Tejun Heo wrote: > > Hello, Daniel. > > > > On Mon, Feb 12, 2018 at 06:00:13PM +0100, Daniel Borkmann wrote: > > > [ +Dennis, +Tejun ] > > > > > > Looks like we're stuck in percpu allocator with key/va

Re: lost connection to test machine (4)

2018-02-12 Thread Tejun Heo
On Mon, Feb 12, 2018 at 09:03:25AM -0800, Tejun Heo wrote: > Hello, Daniel. > > On Mon, Feb 12, 2018 at 06:00:13PM +0100, Daniel Borkmann wrote: > > [ +Dennis, +Tejun ] > > > > Looks like we're stuck in percpu allocator with key/value size of 4 bytes > > each and large number of entries (max_entr

Re: lost connection to test machine (4)

2018-02-12 Thread Tejun Heo
Hello, Daniel. On Mon, Feb 12, 2018 at 06:00:13PM +0100, Daniel Borkmann wrote: > [ +Dennis, +Tejun ] > > Looks like we're stuck in percpu allocator with key/value size of 4 bytes > each and large number of entries (max_entries) in the reproducer in above > link. > > Could we have some __GFP_NOR

Re: lost connection to test machine (4)

2018-02-12 Thread Daniel Borkmann
On 02/12/2018 05:03 PM, Dmitry Vyukov wrote: > On Mon, Feb 12, 2018 at 5:00 PM, syzbot > wrote: >> Hello, >> >> syzbot hit the following crash on bpf-next commit >> 617aebe6a97efa539cc4b8a52adccd89596e6be0 (Sun Feb 4 00:25:42 2018 +) >> Merge tag 'usercopy-v4.16-rc1' of >> git://git.kernel.org

Re: lost connection to test machine (4)

2018-02-12 Thread Dmitry Vyukov
On Mon, Feb 12, 2018 at 5:00 PM, syzbot wrote: > Hello, > > syzbot hit the following crash on bpf-next commit > 617aebe6a97efa539cc4b8a52adccd89596e6be0 (Sun Feb 4 00:25:42 2018 +) > Merge tag 'usercopy-v4.16-rc1' of > git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux > > So far this cr