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From: Christophe Leroy <christophe.leroy@c-s.fr>
To: Qian Cai <cai@lca.pw>, Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Linux Memory Management List <linux-mm@kvack.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Mike Rapoport <rppt@linux.ibm.com>,
	Vineet Gupta <vgupta@synopsys.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Heiko Carstens <heiko.carstens@de.ibm.com>,
	Vasily Gorbik <gor@linux.ibm.com>,
	Christian Borntraeger <borntraeger@de.ibm.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	"H. Peter Anvin" <hpa@zytor.com>,
	"Kirill A . Shutemov" <kirill@shutemov.name>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	linux-snps-arc@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
	linux-s390@vger.kernel.org, linux-riscv@lists.infradead.org,
	the arch/x86 maintainers <x86@kernel.org>,
	linux-arch@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Subject: Re: [PATCH V14] mm/debug: Add tests validating architecture page table helpers
Date: Wed, 4 Mar 2020 07:48:54 +0100	[thread overview]
Message-ID: <c022e863-0807-fab1-cd41-3c320381f448@c-s.fr> (raw)
In-Reply-To: <12260F9A-695D-40F8-932F-61D86D77D441@lca.pw>



Le 04/03/2020 à 02:39, Qian Cai a écrit :
> 
>> Below is slightly modified version of your change above and should still
>> prevent the bug on powerpc. Will it be possible for you to re-test this
>> ? Once confirmed, will send a patch enabling this test on powerpc64
>> keeping your authorship. Thank you.
> 
> This works fine on radix MMU but I decided to go a bit future to test hash
> MMU. The kernel will stuck here below. I did confirm that pte_alloc_map_lock()
> was successful, so I don’t understand hash MMU well enough to tell why
> it could still take an interrupt at pte_clear_tests() even before we calls
> pte_unmap_unlock()?

AFAIU, you are not taking an interrupt here. You are stuck in the 
pte_update(), most likely due to nested locks. Try with LOCKDEP ?

Christophe

> 
> [   33.881515][    T1] ok 8 - property-entry
> [   33.883653][    T1] debug_vm_pgtable: debug_vm_pgtable: Validating
> architecture page table helpers
> [   60.418885][    C8] watchdog: BUG: soft lockup - CPU#8 stuck for 23s!
> [swapper/0:1]



  reply	other threads:[~2020-03-04  6:49 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-17  3:17 [PATCH V14] mm/debug: Add tests validating architecture page table helpers Anshuman Khandual
2020-02-24  1:58 ` Anshuman Khandual
2020-02-26 14:09 ` Qian Cai
2020-02-26 14:12   ` Qian Cai
2020-02-26 14:44     ` Christophe Leroy
2020-02-27  2:34       ` Anshuman Khandual
2020-02-27  4:03         ` Andrew Morton
2020-02-27  4:07           ` Anshuman Khandual
2020-02-26 14:45   ` Christophe Leroy
2020-02-26 15:51     ` Qian Cai
2020-03-02 19:40       ` Qian Cai
2020-03-03  5:55         ` Anshuman Khandual
2020-03-04  1:39           ` Qian Cai
2020-03-04  6:48             ` Christophe Leroy [this message]
2020-03-04 11:29               ` Qian Cai
2020-03-05  0:54                 ` Anshuman Khandual
2020-03-05  5:43                   ` Christophe Leroy
2020-03-05  6:23                     ` Anshuman Khandual
2020-03-03  5:59         ` Christophe Leroy

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