Re: [PROBLEM]: WARNING: lock held when returning to user space! (5.4.1 #16 Tainted: G )

Jarkko Sakkinen
2019-12-09T20:31:55Z

On Mon, Dec 09, 2019 at 10:34:32AM +0000, Will Deacon wrote:
> Hi,
>
> [expanding cc list]
>
> On Sat, Dec 07, 2019 at 11:04:20PM +0530, Jeffrin Jose wrote:
> > i got the following output related from typical dmesg output from 5.4.1 kernel
>
> Was this during boot or during some other operation?
>
> > ================================================
> > WARNING: lock held when returning to user space!
> > 5.4.1 #16 Tainted: G E
> > ------------------------------------------------
> > tpm2-abrmd/691 is leaving the kernel with locks still held!
> > 2 locks held by tpm2-abrmd/691:
> > #0: ffff8881ee784ba8 (&chip->ops_sem){.+.+}, at: tpm_try_get_ops+0x2b/0xc0 [tpm]
> > #1: ffff8881ee784d88 (&chip->tpm_mutex){+.+.}, at: tpm_try_get_ops+0x57/0xc0 [tpm]
>
> Can you reproduce this failure on v5.5-rc1?

Does this appear after variable amount of time or detemitically always
at certain point of time (e.g. when the daemon starts or perhaps always
when doing a certain operations with TSS)?

Do we have possibility to get the user code path that gets executed when
this happens?

/Jarkko