linux-kernel - Re: [PATCH v2] riscv: Add tracepoints for SBI calls and returns

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240813-pony-truck-3e7a83e9759e@spud>
Date: Tue, 13 Aug 2024 21:26:18 +0100
From: Conor Dooley <conor@...nel.org>
To: Samuel Holland <samuel.holland@...ive.com>
Cc: Palmer Dabbelt <palmer@...belt.com>, linux-riscv@...ts.infradead.org,
	Andrew Jones <ajones@...tanamicro.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Alexandre Ghiti <alexghiti@...osinc.com>,
	Anup Patel <apatel@...tanamicro.com>, Marc Zyngier <maz@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] riscv: Add tracepoints for SBI calls and returns

On Thu, Mar 21, 2024 at 04:01:25PM -0700, Samuel Holland wrote:
> These are useful for measuring the latency of SBI calls. The SBI HSM
> extension is excluded because those functions are called from contexts
> such as cpuidle where instrumentation is not allowed.
> 
> Reviewed-by: Andrew Jones <ajones@...tanamicro.com>
> Signed-off-by: Samuel Holland <samuel.holland@...ive.com>

I seem to have bisected a boot failure on v6.11-rc# to this commit,
with a crash before the kernel ever gets to output anything - even on
the bootconsole. For one of these crashes I got the below (which is
actually U-Boots exception handler), but most of the time - nothing at
all. I'll try to decodecode that tomorrow and fish out a config, because
this is either config or toolchain dependant (I saw it in work, with a
slightly different config etc to what I have here).

Starting kernel ...

Unhandled exception: Load access fault
EPC: 000000008020e09c RA: 000000008020e510 TVAL: ffffffff81cbf1f0
EPC: 00000000408a009c RA: 00000000408a0510 reloc adjusted

Code: 3597 01a4 b583 1f45 5613 0035 9a61 95b2 (618c)

resetting ...
reset not supported yet
### ERROR ### Please RESET the board ###

Cheers,
Conor.

Download attachment "signature.asc" of type "application/pgp-signature" (229 bytes)