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From: "agentzh at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug runtime/30408] Always fail to read userland memory (read faults) inside perf event probes with 6.2/6.1 kernels
Date: Tue, 09 May 2023 19:59:16 +0000	[thread overview]
Message-ID: <bug-30408-6586-NiUt8iCAXC@http.sourceware.org/bugzilla/> (raw)
In-Reply-To: <bug-30408-6586@http.sourceware.org/bugzilla/>

https://sourceware.org/bugzilla/show_bug.cgi?id=30408

--- Comment #2 from agentzh <agentzh at gmail dot com> ---
I also noted that reading from the userland stack memory also fails. Tapset
functions like `sprint_ubacktrace()` can only return the top stack frame which
is read from CPU registers (like RIP) directly. Alas. Seems like only register
reading works here.

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  parent reply	other threads:[~2023-05-09 19:59 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-04-30  6:28 [Bug runtime/30408] New: Always fail to read userland memory (read faults) inside perf event probes with 6.2 kernels agentzh at gmail dot com
2023-05-02 22:31 ` [Bug runtime/30408] " agentzh at gmail dot com
2023-05-02 22:32 ` [Bug runtime/30408] Always fail to read userland memory (read faults) inside perf event probes with 6.2/6.1 kernels agentzh at gmail dot com
2023-05-09 19:59 ` agentzh at gmail dot com [this message]
2023-05-09 20:04 ` agentzh at gmail dot com
2023-05-13  5:33 ` agentzh at gmail dot com
2023-05-13  6:28 ` agentzh at gmail dot com
2023-05-16 19:28 ` agentzh at gmail dot com
2023-05-16 19:51 ` agentzh at gmail dot com

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