linux-kernel - Re: [PATCH] arch/{mips,sparc,microblaze,powerpc}: Don't enable pagefault/preempt twice

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Message-ID: <20200604063745.GB202650@kernel.org>
Date:   Thu, 4 Jun 2020 09:37:45 +0300
From:   Mike Rapoport <rppt@...nel.org>
To:     Ira Weiny <ira.weiny@...el.com>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
        Helge Deller <deller@....de>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        Dan Williams <dan.j.williams@...el.com>,
        linux-snps-arc@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-csky@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, sparclinux@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org, dri-devel@...ts.freedesktop.org,
        Christian Koenig <christian.koenig@....com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH] arch/{mips,sparc,microblaze,powerpc}: Don't enable
 pagefault/preempt twice

On Wed, Jun 03, 2020 at 11:22:26PM -0700, Ira Weiny wrote:
> On Wed, Jun 03, 2020 at 04:44:17PM -0700, Guenter Roeck wrote:
> 
> With linux-next on sparc I too see the spinlock issue; something like:
> 
> ...
> Starting syslogd: BUG: spinlock recursion on CPU#0, S01syslogd/139
>  lock: 0xf53ef350, .magic: dead4ead, .owner: S01syslogd/139, .owner_cpu: 0
> CPU: 0 PID: 139 Comm: S01syslogd Not tainted 5.7.0-next-20200603 #1
> [f0067d00 : 
> do_raw_spin_lock+0xa8/0xd8 ] 
> [f00d598c : 
> copy_page_range+0x328/0x804 ] 
> [f0025c34 : 
> dup_mm+0x334/0x434 ] 
> [f0027198 : 
> copy_process+0x1248/0x12d4 ] 
> [f00273b8 : 
> _do_fork+0x54/0x30c ] 
> [f00276e4 : 
> do_fork+0x5c/0x6c ] 
> [f000de44 : 
> sparc_do_fork+0x18/0x38 ] 
> [f000b7f4 : 
> do_syscall+0x34/0x40 ] 
> [5010cd4c : 
> 0x5010cd4c ] 
> 
> 
> I'm going to bisect between there and HEAD.

The sparc issue should be fixed by 

https://lore.kernel.org/lkml/20200526173302.377-1-will@kernel.org
 
> Ira

-- 
Sincerely yours,
Mike.