On Mon, 11 Jun 2018 23:09:06 +0300 Wirz <spam@xxxxxxxxxxxxx> wrote: > the bisection leads to > > 142a27f0a731ddcf467546960a5585970ca98e21 is the first bad commit > commit 142a27f0a731ddcf467546960a5585970ca98e21 > Author: PrasannaKumar Muralidharan <prasannatsmkumar@xxxxxxxxx> > Date: Fri Oct 27 22:34:04 2017 +0530 > > hwrng: core - Reset user selected rng by writing "" to rng_current > > User is able to select a chosen rng by writing its name to rng_current > but there is no way to reset it without unbinding the rng. Let user > write "" to rng_current and delesect the chosen rng. > > Signed-off-by: PrasannaKumar Muralidharan <prasannatsmkumar@xxxxxxxxx> > reviewed-by: Harald Freudenberger <freude@xxxxxxxxxxxxxxxxxx> > Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> > > :040000 040000 f61e5cc501c99fb09bae5f203528b9f4c3479f8a > 785262813cfb02c9606fd72274f0f7b44f2289d7 M drivers Thanks a lot for bisecting this. This commit introduces a bug, if b43 is the only RNG in the system. But that is unlikely on modern systems and it's fixed by 0e4b52942b1c76f89e0dcb829f72e123d0678f54, which is in 4.16. Other than that I currently can't see why this crashes. But the crash should go away, if you disable CONFIG_B43_HWRNG. That's not a solution, but it may help, if you would like to get rid of the crashes. Could you please verify whether disabling CONFIG_B43_HWRNG avoids the crash, just to make sure we are not after a red herring here? Thanks. -- Michael
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