Re: crypto: hang in crypto_larval_lookup

[Herbert Xu <herbert@gondor.apana.org.au>]

Harald Freudenberger <freude@linux.vnet.ibm.com> wrote:
> 
> Hello all
> 
> I am currently following a hang at modprobe aes_s390 where
> crypto_register_alg() does not come back for the xts(aes) algorithm.
> 
> The registration is waiting forever in algapi.c crypto_wait_for_test() but
> the completion never occurs. The cryptomgr is triggering a test via
> kthread_run to invoce cryptomgr_probe and this thread is calling the
> create() function of the xts template (file xts.c). Following this thread
> it comes down to api.c crypto_larval_lookup(name="aes") which is first
> requesting the module "crypto-aes" via request_module() successful and then
> blocking forever in requesting the module "crypto-aes-all".
> 
> The xts(aes) has at registration CRYPTO_ALG_NEED_FALLBACK flag on.
> 
> This problem is seen since about 6 weeks now, first only on the linux next
> kernel. Now it appers on the 4.10-rc kernels as well. And I still have no
> idea on how this could be fixed or what's wrong with just the xts
> registration (ecb, cbc, ctr work fine).
> 
> Any ideas or hints?

Sorry, my fault.  I should've converted all the fallback users of
the old blkcipher interface over to skcipher before converting the
core algorithms to skcipher.

I'll send a patch.

Cheers,
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt