linux-kernel - Re: [PATCH v9 0/4] Uprobes: Support SDT markers having reference count (semaphore)

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Message-Id: <2e997c62-371c-1d9d-97ab-65726f588ab5@linux.ibm.com>
Date:   Tue, 21 Aug 2018 10:53:18 +0530
From:   Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
To:     Song Liu <liu.song.a23@...il.com>
Cc:     Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>, mhiramat@...nel.org,
        Peter Zijlstra <peterz@...radead.org>, mingo@...hat.com,
        acme@...nel.org, alexander.shishkin@...ux.intel.com,
        jolsa@...hat.com, namhyung@...nel.org,
        open list <linux-kernel@...r.kernel.org>,
        ananth@...ux.vnet.ibm.com,
        Alexis Berlemont <alexis.berlemont@...il.com>,
        naveen.n.rao@...ux.vnet.ibm.com,
        linux-arm-kernel@...ts.infradead.org, linux-mips@...ux-mips.org,
        linux@...linux.org.uk, ralf@...ux-mips.org, paul.burton@...s.com,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Subject: Re: [PATCH v9 0/4] Uprobes: Support SDT markers having reference
 count (semaphore)

Hi Song,

> However, if I start a.out AFTER enabling the uprobe, there is something wrong:
> 
> root@...t-test:~# ~/a.out
> 11
> semaphore 0       <<< this should be non-zero, as the uprobe is already enabled

Ok. I'm able to reproduce this. Digging deeper.

Ravi