From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 280A83858404; Tue, 9 May 2023 19:59:17 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 280A83858404 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1683662357; bh=/3431+O+rVqe+8t+as8p7UfLDi8ZAr8ku0VCURrtmDw=; h=From:To:Subject:Date:In-Reply-To:References:From; b=Iy1GLcH1CGhECaXpXRIaqjJbJMLo7r9gwu1qkSoBe1FNSYpqKVxl5fN/QzQiBn8RL ShKXmusQmYd6o2ashGGvD2tMJ8tMGMtzihqDmjm5EeRdjIeyn7jRpnBfP61xxZ+1r2 wiOBZ32W6CYVXVPpiXktvEzd7AMVmjuuPwQZMVmY= From: "agentzh at gmail dot com" 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 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: systemtap X-Bugzilla-Component: runtime X-Bugzilla-Version: unspecified X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: agentzh at gmail dot com X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Resolution: X-Bugzilla-Priority: P2 X-Bugzilla-Assigned-To: systemtap at sourceware dot org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://sourceware.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 List-Id: https://sourceware.org/bugzilla/show_bug.cgi?id=3D30408 --- Comment #2 from agentzh --- I also noted that reading from the userland stack memory also fails. Tapset functions like `sprint_ubacktrace()` can only return the top stack frame wh= ich is read from CPU registers (like RIP) directly. Alas. Seems like only regis= ter reading works here. --=20 You are receiving this mail because: You are the assignee for the bug.=