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Message-ID: <20180608163600.GA9030@redhat.com>
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.
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