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

From: Mike Rapoport <[email-masked]>
Date: Thu, 4 Jun 2020 09:37:45 +0300

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/[email-masked]
 
> Ira

-- 
Sincerely yours,
Mike.

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