linux-kernel - [Query] Generating profile for propeller fails

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>] [day] [month] [year] [list]

Message-ID: <e3e57e5e-70dc-420c-9f98-2278c2505979@oracle.com>
Date: Tue, 9 Sep 2025 01:05:56 +0530
From: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
To: Rong Xu <xur@...gle.com>, Han Shen <shenhan@...gle.com>
Cc: LKML <linux-kernel@...r.kernel.org>
Subject: [Query] Generating profile for propeller fails

Hi Rong and Han,

Thanks for your work on auofdo and propeller.

I was trying autofdo and propeller with the latest 6.17-rc4 linux kernel.

I have built the kernel rpm with LLVM=1 and I have installed LLVM from 
latest source from the git. (https://github.com/llvm/llvm-project.git 
93c2eecda521049ca6334830a69fdff54967b440)

# grep -e "AUTOFDO" /boot/config-6.17.0-rc4
CONFIG_ARCH_SUPPORTS_AUTOFDO_CLANG=y
CONFIG_AUTOFDO_CLANG=y

# grep -e "PROPELLER" /boot/config-6.17.0-rc4
CONFIG_ARCH_SUPPORTS_PROPELLER_CLANG=y
CONFIG_PROPELLER_CLANG=y

# uname -a
Linux hamogala-vm-1 6.17.0-rc4 #17 SMP PREEMPT_DYNAMIC Mon Sep  8 
07:49:54 GMT 2025 x86_64 x86_64 x86_64 GNU/Linux

Collected the profile using:

# perf  record --pfm-events BR_INST_RETIRED.NEAR_TAKEN:k -a -N -b -c 
500009 -o rc4-propeller-intel.data -- load.sh

# dmesg | grep -i lbr
[    0.289671] Performance Events: PEBS fmt4+-baseline,  AnyThread 
deprecated, Icelake events, 32-deep LBR, full-width counters, Intel PMU 
driver.

Now when I copy this perf data to the other machine where I compiled my 
kernel and tried to create a profile with create_llvm_prof tool from the 
latest autofdo project like this:

# time ./create_llvm_prof --binary=vmlinux 
--profile=rc4-propeller-intel.data --format=propeller 
--propeller_output_module_name --out=prop_cc_profile.txt 
--propeller_symorder=prop_ld_profile.txt

I run into this error: ( Note the kernel is autofdo trained kernel yet, 
but I am trying propeller directly:)

W20250908 19:18:38.009934 2251492 
llvm_propeller_perf_lbr_aggregator.cc:103] not a 
potentially-control-flow-affecting instruction at address: 
0xffffffff8184d60a with counter sum 2090, instruction name: NOOP
I20250908 19:18:38.013391 2251492 
llvm_propeller_binary_address_mapper.cc:463] Started reading the binary 
content from: vmlinux
E20250908 19:18:38.115377 2251492 create_llvm_prof.cc:238] INTERNAL: 
Failed to read the LLVM_BB_ADDR_MAP section from vmlinux: unable to read 
SHT_LLVM_BB_ADDR_MAP section with index 59: unsupported 
SHT_LLVM_BB_ADDR_MAP version: 3.

Any suggestions/thoughts on why this could happen ?

Thanks,
Harshit