[Bug 287050] Change in PTRACE_CONTINUE causing valgrind/vgdb to no longer be able to interrupt debuggee

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287050

--- Comment #10 from Paul Floyd <pjfloyd@wanadoo.fr> ---
I've started looking at Linux. I've been using perf trace, but it's not as nice
as ktrace/kdump (doesn't translate argument values and doesn't show signals).

I can also reproduce a similar problem with gdb (but not lldb).

terminal 1: run sleep 100000
terminal 2: gdb, attach to pid of sleep, then call printf("hello")

On 14.2 that works, on 15.0 it hangs in a similar way to gdb/vgdb/valgrind.

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