linux-kernel - Re: x60: warnings on boot and resume, arch/x86/mm/tlb.c:257 initialize_ ... was Re: [PATCH 0/2] Fix resume failure due to PCID

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Date:   Fri, 15 Sep 2017 10:39:01 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Pavel Machek <pavel@....cz>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>, X86 ML <x86@...nel.org>,
        Borislav Petkov <bpetkov@...e.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: x60: warnings on boot and resume, arch/x86/mm/tlb.c:257
 initialize_ ... was Re: [PATCH 0/2] Fix resume failure due to PCID


* Pavel Machek <pavel@....cz> wrote:

> On Wed 2017-09-06 20:25:10, Linus Torvalds wrote:
> > On Wed, Sep 6, 2017 at 7:54 PM, Andy Lutomirski <luto@...nel.org> wrote:
> > > Patch 1 is the fix.  Patch 2 is a comment that would have kept me from
> > > chasing down a false lead.
> > 
> > Yes, this seems to fix things for me. Thanks.
> > 
> > Of course, right now that laptop has no working wifi with tip-of-tree
> > due to some issues with the networking tree, but that's an independent
> > thing and I could suspend and resume with this. So applied and pushed
> > out,
> 
> Ok, seems this is still not completely right, I'm now getting WARN_ON
> during boot and on every resume... but machine works.
> 
> 4.14-rc0, 32-bit.

Which SHA1, just to make sure? (Please enable CONFIG_LOCALVERSION_AUTO=y.)

> [    0.004000] Initializing CPU#1
> [    0.004000] ------------[ cut here ]------------
> [    0.004000] WARNING: CPU: 1 PID: 0 at arch/x86/mm/tlb.c:257 initialize_tlbstate_and_flush+0x27/0xcf
> [    0.004000] Modules linked in:
> [    0.004000] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.13.0+ #429
> [    0.004000] Hardware name: LENOVO 17097HU/17097HU, BIOS 7BETD8WW (2.19 ) 03/31/2011
> [    0.004000] task: f5ca2080 task.stack: f5cc4000
> [    0.004000] EIP: initialize_tlbstate_and_flush+0x27/0xcf
> [    0.004000] EFLAGS: 00210087 CPU: 1
> [    0.004000] EAX: 00000000 EBX: c506d540 ECX: 051b2000 EDX: 00000000
> [    0.004000] ESI: 0503f000 EDI: c51b2000 EBP: f5cc5f54 ESP: f5cc5f48
> [    0.004000]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
> [    0.004000] CR0: 80050033 CR2: 00000000 CR3: 0503f000 CR4: 000006b0
> [    0.004000] Call Trace:
> [    0.004000]  cpu_init+0xdc/0x2f0
> [    0.004000]  start_secondary+0x34/0x1c6
> [    0.004000]  startup_32_smp+0x164/0x166
> [    0.004000]  ? startup_32_smp+0x164/0x166

Could you please try the debug patch below, so that we get a bit more info?

Thanks,

	Ingo

===============>

 arch/x86/mm/tlb.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index 1ab3821f9e26..f98feb4b39a7 100644
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -254,7 +254,8 @@ void initialize_tlbstate_and_flush(void)
 	unsigned long cr3 = __read_cr3();
 
 	/* Assert that CR3 already references the right mm. */
-	WARN_ON((cr3 & CR3_ADDR_MASK) != __pa(mm->pgd));
+	if (WARN_ON((cr3 & CR3_ADDR_MASK) != __pa(mm->pgd)))
+		printk("# CR3: %016lx, __pa(mm->pgd): %016lx\n", cr3, __pa(mm->pgd));
 
 	/*
 	 * Assert that CR4.PCIDE is set if needed.  (CR4.PCIDE initialization