From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 98E8924A058 for ; Thu, 5 Mar 2026 14:56:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772722577; cv=none; b=pXA6qOq99KNbUNbNHRC1wbIdV3Iq1dLO5Pf4JU0YL5HUPXy0VTqJRXSxJ11SyDoKgapRw8DmvPh94pfiQ/HM/GwEkuw2+TSJmYa+CE1iPFXhpd4f/m3hjcLsuv3I02aeRqLBovjZM35J1LJ1sW42ITpWZl4HHizl9ywzT/LnAQo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772722577; c=relaxed/simple; bh=3531iet2nTHhQHn9pvIkCq4LhaxojlrgXKgqICciq+U=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=Fc3zIBp8TXF7KQ02XcCalk2NmYtMA/rFIB/ziOhRctYRorHjGvLy8w5CACSSdEvzNCf0jInzw7GIppIj+999YqPPt97RBzdJtpL9f5s+0jOEhLAiz7773qqB2vt098yTWMz8mQ8uKIpw35mfOB0PLF5jVQfetQLki4OjZ8zuOBI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=X9Vyhkj7; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="X9Vyhkj7" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 149CCC116C6; Thu, 5 Mar 2026 14:56:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772722577; bh=3531iet2nTHhQHn9pvIkCq4LhaxojlrgXKgqICciq+U=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=X9Vyhkj7gBde/+NQzwWXyVS5kQTwlLeeneHNc4CgAnnMPfkWaEakDiJ5t+HQZKjae Sxh6if82xYkHtl3YV6JQ0Lt6i+StthXoPEp+aCl/0UYk/mXh6Q+IExIiNcAm/ZevVI Q/YXdd1/bKkKwEq3BgyG8LSdM979mS83T3yrdF6ZkxNtPCRejsAjuTPHOSwbQoWZii b4k32WMbKR6BlixwhIGk0HGN35OxYqufa5Q8clIQ4oDXGfnIYTLmw8SI8L8+lUVTIr hCEvWX9V6xDDFkCQRMjiet269rnAlKD631ynhYWR4tZQjp2Dxco5IOxYawSAfshI9t 2aMLcQHu46WRA== Message-ID: <23aaa915-08b4-4f9d-9622-6ee7f770c8be@kernel.org> Date: Thu, 5 Mar 2026 15:56:13 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Beta Subject: Re: [PATCH] decode_stacktrace: Support heuristic caller address search To: "Masami Hiramatsu (Google)" , Andrew Morton , Sasha Levin Cc: Carlos Llamas , Luca Ceresoli , linux-kernel@vger.kernel.org References: <177268753893.3271988.11559821020066428486.stgit@mhiramat.tok.corp.google.com> From: Matthieu Baerts Content-Language: en-GB, fr-BE Autocrypt: addr=matttbe@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit Hi Masami, On 05/03/2026 06:12, Masami Hiramatsu (Google) wrote: > From: Masami Hiramatsu (Google) > > Add -c option to search call address search to decode_stacktrace. > This tries to decode line info backwards, starting from 1byte before > the return address, and displays the first line info it founds as > the caller address. > If it tries up to 10bytes before (or the symbol address) and still > can not find it, it gives up and decodes the return address. Thank you for this new option! > With -c option: > Call Trace: > > dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120) > lockdep_rcu_suspicious (kernel/locking/lockdep.c:6876) > event_filter_pid_sched_process_fork (kernel/trace/trace_events.c:1057) > kernel_clone (include/trace/events/sched.h:396 include/trace/events/sched.h:396 kernel/fork.c:2664) > __x64_sys_clone (kernel/fork.c:2795 kernel/fork.c:2779 kernel/fork.c:2779) > do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) > ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) > ? trace_irq_disable (include/trace/events/preemptirq.h:36) > entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) > > > Without -c option: > Call Trace: > > dump_stack_lvl (lib/dump_stack.c:122) > lockdep_rcu_suspicious (kernel/locking/lockdep.c:6877) > event_filter_pid_sched_process_fork (kernel/trace/trace_events.c:?) > kernel_clone (include/trace/events/sched.h:? include/trace/events/sched.h:396 kernel/fork.c:2664) > __x64_sys_clone (kernel/fork.c:2779) > do_syscall_64 (arch/x86/entry/syscall_64.c:?) > ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) > ? trace_irq_disable (include/trace/events/preemptirq.h:36) > entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) That's better indeed! Do we need a new option for that? Could it not be the new default behaviour? Or are there any downsides with it? "addr2line" will be called more, but if it is worth it, it is probably not an issue, or is it? Cheers, Matt -- Sponsored by the NGI0 Core fund.