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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug threads/26286] FAIL:
 gdb.threads/attach-many-short-lived-threads.exp: iter 1: break at break_fn: 1
 (SIGTRAP)
Date: Mon, 31 Aug 2020 08:30:39 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D26286

--- Comment #4 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Chungyi Chi from comment #3)
> It is not a bug but security issue. Due to ptrace protection, if you wanna
> attach another process without "parent-child relationship", it is illegal
> behavior.
>=20
> There are two different way to solve this issue.
> 1. Execute under root level
> 2. Set "/proc/sys/kernel/yama/ptrace_scope" into 0.

On my system, there's no yama:
...
$ cat /sys/kernel/security/lsm=20
lockdown,capability,apparmor
$
...

Also, I don't understand how yama would cause the specific failure reported=
 in
this PR.  If yama were active, wouldn't things fail much earlier, and in mu=
ch
more tests?

--=20
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