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

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Date:   Mon, 9 Dec 2019 22:25:52 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Will Deacon <will@...nel.org>
Cc:     Jeffrin Jose <jeffrin@...agiritech.edu.in>, peterz@...radead.org,
        mingo@...hat.com, linux-kernel@...r.kernel.org,
        linux-integrity@...r.kernel.org, peterhuewe@....de, jgg@...pe.ca
Subject: Re: [PROBLEM]:  WARNING: lock held when returning to user space!
 (5.4.1 #16 Tainted: G )

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