[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]

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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