linux-kernel - Re: [PATCH v7 3/6] Uprobes: Support SDT markers having reference count (semaphore)

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Date:   Tue, 7 Aug 2018 18:03:20 +0530
From:   Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
To:     Oleg Nesterov <oleg@...hat.com>
Cc:     srikar@...ux.vnet.ibm.com, rostedt@...dmis.org,
        mhiramat@...nel.org, liu.song.a23@...il.com, 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,
        ananth@...ux.vnet.ibm.com, 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 v7 3/6] Uprobes: Support SDT markers having reference
 count (semaphore)

Hi Oleg,

>> I'm sorry. I didn't get this. How can uprobe go away without calling
>>     uprobe_unregister()
>>     -> rergister_for_each_vma()
>>        -> remove_breakpoint()
>> And remove_breakpoint() will get called
> 
> assuming that _unregister() will find the same vma with the probed insn. But
> as I said, the application can munmap the probed page/vma.

Got it now :)

Thanks.