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Date: Sun, 21 Mar 2021 10:28:49 +0200 From: Leon Romanovsky <leon@...nel.org> To: Dmitry Vyukov <dvyukov@...gle.com> Cc: davem@...emloft.net, edumazet@...gle.com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] net: make unregister netdev warning timeout configurable On Sat, Mar 20, 2021 at 03:28:51PM +0100, Dmitry Vyukov wrote: > netdev_wait_allrefs() issues a warning if refcount does not drop to 0 > after 10 seconds. While 10 second wait generally should not happen > under normal workload in normal environment, it seems to fire falsely > very often during fuzzing and/or in qemu emulation (~10x slower). > At least it's not possible to understand if it's really a false > positive or not. Automated testing generally bumps all timeouts > to very high values to avoid flake failures. > Make the timeout configurable for automated testing systems. > Lowering the timeout may also be useful for e.g. manual bisection. > The default value matches the current behavior. > > Signed-off-by: Dmitry Vyukov <dvyukov@...gle.com> > Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=211877 > Cc: netdev@...r.kernel.org > Cc: linux-kernel@...r.kernel.org > --- > net/Kconfig | 12 ++++++++++++ > net/core/dev.c | 4 +++- > 2 files changed, 15 insertions(+), 1 deletion(-) > Our verification team would like to see this change too. Thanks, Reviewed-by: Leon Romanovsky <leonro@...dia.com>
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