From: Vineet Gupta <vineet.gupta1@synopsys.com>
To: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
Eugeniy Paltsev <eugeniy.paltsev@synopsys.com>,
"linux-snps-arc@lists.infradead.org"
<linux-snps-arc@lists.infradead.org>
Cc: "linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"peterz@infradead.org" <peterz@infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Michal Hocko <mhocko@kernel.org>
Subject: Re: [PATCH 1/2] ARC: show_regs: avoid page allocator
Date: Thu, 20 Dec 2018 18:43:08 +0000 [thread overview]
Message-ID: <C2D7FE5348E1B147BCA15975FBA23075014642388B@US01WEMBX2.internal.synopsys.com> (raw)
In-Reply-To: e2d2c160-0ef6-5504-7824-032a5c70fa7f@I-love.SAKURA.ne.jp
On 12/20/18 5:30 AM, Tetsuo Handa wrote:
>> | Stack Trace:
>> | arc_unwind_core+0xcc/0x100
>> | ___might_sleep+0x17a/0x190
>> | mmput+0x16/0xb8
> Then, does mmput_async() help?
>
It helps, but then we get the next one (w/o my patch 2/2)
BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:23
in_atomic(): 1, irqs_disabled(): 0, pid: 69, name: segv-null-ptr
no locks held by segv-null-ptr/69.
CPU: 0 PID: 69 Comm: segv-null-ptr Not tainted 4.18.0+ #72
Stack Trace:
arc_unwind_core+0xcc/0x100
___might_sleep+0x17a/0x190
down_read+0x18/0x38
show_regs+0x102/0x310
get_signal+0x5ee/0x610
do_signal+0x2c/0x218
resume_user_mode_begin+0x90/0xd8
@off 0x103d4 in [/segv-null-pt
next prev parent reply other threads:[~2018-12-20 18:43 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-18 18:53 [PATCH 0/2] ARC show_regs fixes Vineet Gupta
2018-12-18 18:53 ` [PATCH 1/2] ARC: show_regs: avoid page allocator Vineet Gupta
2018-12-19 17:04 ` Eugeniy Paltsev
2018-12-19 17:36 ` Vineet Gupta
2018-12-20 1:16 ` Vineet Gupta
2018-12-20 13:30 ` Tetsuo Handa
2018-12-20 18:36 ` Vineet Gupta
2018-12-20 18:43 ` Vineet Gupta [this message]
2018-12-19 20:46 ` William Kucharski
2018-12-19 21:36 ` Vineet Gupta
2018-12-20 12:57 ` Michal Hocko
2018-12-20 18:38 ` Vineet Gupta
2018-12-18 18:53 ` [PATCH 2/2] ARC: show_regs: fix lockdep splat for good Vineet Gupta
2018-12-20 13:04 ` Michal Hocko
2018-12-20 18:45 ` Vineet Gupta
2018-12-21 13:04 ` Michal Hocko
2018-12-21 13:27 ` Michal Hocko
2018-12-21 17:55 ` Vineet Gupta
2018-12-24 19:10 ` Michal Hocko
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