linux-kernel - Re: [PATCH] perf: Fix oops when kthread execs user process

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Message-ID: <20190529170313.GE2623@hirez.programming.kicks-ass.net>
Date:   Wed, 29 May 2019 19:03:13 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mark Rutland <mark.rutland@....com>
Cc:     Will Deacon <will.deacon@....com>,
        Young Xiao <92siuyang@...il.com>, linux@...linux.org.uk,
        mingo@...hat.com, bp@...en8.de, hpa@...or.com, x86@...nel.org,
        kan.liang@...ux.intel.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, ravi.bangoria@...ux.vnet.ibm.com,
        mpe@...erman.id.au, acme@...hat.com, eranian@...gle.com,
        fweisbec@...il.com, jolsa@...hat.com
Subject: Re: [PATCH] perf: Fix oops when kthread execs user process

On Wed, May 29, 2019 at 05:38:54PM +0100, Mark Rutland wrote:
> Sorry for the noise.

n/p, confusion happens :-)

> Generally speaking though, if we ever task task_pt_regs() of an idle
> task we'll get junk, and user_mode() could be true.

Agreed, but we're not doing that.