linux-kernel - Re: [PATCH 0/7] Uprobes: Support SDT markers having reference count (semaphore)

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Date:   Fri, 8 Jun 2018 18:36:01 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Cc:     srikar@...ux.vnet.ibm.com, rostedt@...dmis.org,
        mhiramat@...nel.org, peterz@...radead.org, mingo@...hat.com,
        acme@...nel.org, alexander.shishkin@...ux.intel.com,
        jolsa@...hat.com, namhyung@...nel.org,
        linux-kernel@...r.kernel.org, corbet@....net,
        linux-doc@...r.kernel.org, ananth@...ux.vnet.ibm.com,
        alexis.berlemont@...il.com, naveen.n.rao@...ux.vnet.ibm.com
Subject: Re: [PATCH 0/7] Uprobes: Support SDT markers having reference count
 (semaphore)

Hello,

I am travelling till the end of the next week, can't read this version
until I return. Just one question,

On 06/06, Ravi Bangoria wrote:
>
>  1. One of the major reason was the deadlock between uprobe_lock and
>  mm->mmap inside trace_uprobe_mmap(). That deadlock was not easy to fix

Could you remind what exactly was wrong?

I can't find your previous email about this problem, but iirc you didn't
explain the deadlock in details, just copied some traces from lockdep...

Oleg.