Source: linux-source-6.12 Severity: normal Tags: ftbfs X-Debbugs-Cc: [email protected] User: [email protected] Usertags: amd64
Dear Maintainer, I installed linux-image-6.12.41+deb13-rt-amd64 on an embedded platform. A required kvaser_pciefd device driver is missing; it is in the linux source tree (drivers/net/can/kvaser_pciefd.c), but disabled in .config. So I tried to build it separately, using instructions on: https://kernel-team.pages.debian.net/kernel-handbook/ch-common-tasks.html https://imil.net/blog/posts/2022/build-a-single-in-tree-linux-kernel-module-debian--clones/ Attempted steps are: <on development platform with trixie docker container> sudo apt install linux-image-6.12.41+deb13-rt-amd64 sudo apt install linux-headers-6.12.41+deb13-rt-amd64 sudo apt install linux-source-6.12 tar xaf /usr/src/linux-source-6.12.tar.xz cd linux-source-6.12/ cp /boot/config-6.12.41+deb13-rt-amd64 .config cp /usr/src/linux-headers-6.12.41+deb13-rt-amd64/Module.symvers . scripts/config --module CAN_KVASER_PCIEFD make oldconfig scripts prepare modules_prepare make -C . M=drivers/net/can <copy to target> sudo insmod kvaser_pciefd.ko However, 'make oldconfig' requests for missing configuration options (see below). A first attempt with the default options produces an incompatible kernel module: insmod: ERROR: could not insert module kvaser_pciefd.ko: Invalid module format >From dmesg: [69966.964063] kvaser_pciefd: version magic '6.12.41 SMP preempt_rt mod_unload modversions ' should be '6.12.41+deb13-rt-amd64 SMP preempt mod_unload modversions ' With these additional configuration changes, 'make oldconfig' remains silent: scripts/config --set-str BUILD_SALT '6.12.41+deb13-rt-amd64' scripts/config --set-str LOCALVERSION '+deb13-rt-amd64' scripts/config --disable PREEMPT_NONE scripts/config --disable PREEMPT_VOLUNTARY scripts/config --enable PREEMPT_BUILD scripts/config --disable MODULE_SIG_ALL scripts/config --set-str MODULE_SIG_KEY '' scripts/config --set-str SYSTEM_TRUSTED_KEYS '' However, the module still won't load: [70821.323351] kvaser_pciefd: version magic '6.12.41+deb13-rt-amd64 SMP preempt_rt mod_unload modversions ' should be '6.12.41+deb13-rt-amd64 SMP preempt mod_unload modversions ' Note the 'preempt_rt' vs 'preempt' version magic. The updated .config has quite some changes, notably: -CONFIG_PREEMPT_BUILD=y -CONFIG_ARCH_HAS_PREEMPT_LAZY=y +# CONFIG_PREEMPT_NONE is not set +# CONFIG_PREEMPT_VOLUNTARY is not set # CONFIG_PREEMPT is not set -CONFIG_PREEMPT_LAZY=y -# CONFIG_PREEMPT_LAZIEST is not set CONFIG_PREEMPT_RT=y CONFIG_PREEMPT_COUNT=y CONFIG_PREEMPTION=y -CONFIG_PREEMPT_DYNAMIC=y # CONFIG_SCHED_CORE is not set # CONFIG_SCHED_CLASS_EXT is not set (And probably as a result: -CONFIG_UNINLINE_SPIN_UNLOCK=y) According to include/linux/vermagic.h, the lacking CONFIG_PREEMPT_BUILD causes the version magic difference. An (ugly) work-around is to use: echo '#define CONFIG_PREEMPT_BUILD 1' >> include/generated/autoconf.h This produces a loadable kernel module (so the bug title is a bit exaggerated), although it causes the kernel to be tainted (not unexpected): [71610.769100] kvaser_pciefd: loading out-of-tree module taints kernel. [71610.769391] kvaser_pciefd: module verification failed: signature and/or required key missing - tainting kernel I would expect that building a module from the linux-source package is supported (hence this bug report), but please correct me if I'm wrong. Note that I also tried to build the kernel (including the module) from the deb source ('apt source linux-image-6.12.41+deb13-rt-amd64-unsigned'), but the resulting kernel has a different symbol layout and hence the module cannot be loaded by the original kernel. Thanks! Roel PS. Enabling CAN_KVASER_PCIEFD by default would be helpful as well of course :-) 'make oldconfig' output: * * Restart config... * * * General setup * Compile also drivers which will not load (COMPILE_TEST) [N/y/?] n Compile the kernel with warnings as errors (WERROR) [N/y/?] n Local version - append to kernel release (LOCALVERSION) [] Automatically append version information to the version string (LOCALVERSION_AUTO) [N/y/?] n Build ID Salt (BUILD_SALT) [] (NEW) Kernel compression mode 1. Gzip (KERNEL_GZIP) 2. Bzip2 (KERNEL_BZIP2) 3. LZMA (KERNEL_LZMA) 4. XZ (KERNEL_XZ) 5. LZO (KERNEL_LZO) 6. LZ4 (KERNEL_LZ4) > 7. ZSTD (KERNEL_ZSTD) choice[1-7?]: 7 Default init path (DEFAULT_INIT) [] Default hostname (DEFAULT_HOSTNAME) [(none)] (none) System V IPC (SYSVIPC) [Y/n/?] y POSIX Message Queues (POSIX_MQUEUE) [Y/n/?] y General notification queue (WATCH_QUEUE) [N/y/?] n Enable process_vm_readv/writev syscalls (CROSS_MEMORY_ATTACH) [Y/n/?] y uselib syscall (for libc5 and earlier) (USELIB) [Y/n/?] y Auditing support (AUDIT) [Y/?] y Preemption Model 1. No Forced Preemption (Server) (PREEMPT_NONE) (NEW) 2. Voluntary Kernel Preemption (Desktop) (PREEMPT_VOLUNTARY) (NEW) 3. Preemptible Kernel (Low-Latency Desktop) (PREEMPT) > 4. Fully Preemptible Kernel (Real-Time) (PREEMPT_RT) choice[1-4?]: Core Scheduling for SMT (SCHED_CORE) [N/y/?] n Extensible Scheduling Class (SCHED_CLASS_EXT) [N/y/?] n CPU isolation (CPU_ISOLATION) [Y/?] y Kernel .config support (IKCONFIG) [N/m/y/?] n Enable kernel headers through /sys/kernel/kheaders.tar.xz (IKHEADERS) [N/m/y/?] n Kernel log buffer size (16 => 64KB, 17 => 128KB) (LOG_BUF_SHIFT) [17] 17 CPU kernel log buffer size contribution (13 => 8 KB, 17 => 128KB) (LOG_CPU_MAX_BUF_SHIFT) [12] 12 Printk indexing debugfs interface (PRINTK_INDEX) [N/y/?] n Checkpoint/restore support (CHECKPOINT_RESTORE) [Y/n/?] y Automatic process group scheduling (SCHED_AUTOGROUP) [N/y/?] n Kernel->user space relay support (formerly relayfs) (RELAY) [Y/?] y Initial RAM filesystem and RAM disk (initramfs/initrd) support (BLK_DEV_INITRD) [Y/n/?] y Initramfs source file(s) (INITRAMFS_SOURCE) [] Support initial ramdisk/ramfs compressed using gzip (RD_GZIP) [Y/n/?] y Support initial ramdisk/ramfs compressed using bzip2 (RD_BZIP2) [Y/n/?] y Support initial ramdisk/ramfs compressed using LZMA (RD_LZMA) [Y/n/?] y Support initial ramdisk/ramfs compressed using XZ (RD_XZ) [Y/n/?] y Support initial ramdisk/ramfs compressed using LZO (RD_LZO) [Y/n/?] y Support initial ramdisk/ramfs compressed using LZ4 (RD_LZ4) [Y/n/?] y Support initial ramdisk/ramfs compressed using ZSTD (RD_ZSTD) [Y/n/?] y Boot config support (BOOT_CONFIG) [N/y/?] n Preserve cpio archive mtimes in initramfs (INITRAMFS_PRESERVE_MTIME) [Y/n/?] y Compiler optimization level > 1. Optimize for performance (-O2) (CC_OPTIMIZE_FOR_PERFORMANCE) 2. Optimize for size (-Os) (CC_OPTIMIZE_FOR_SIZE) choice[1-2?]: 1 Enable madvise/fadvise syscalls (ADVISE_SYSCALLS) [Y/n/?] y Enable membarrier() system call (MEMBARRIER) [Y/?] y Enable kcmp() system call (KCMP) [Y/?] y Enable rseq() system call (RSEQ) [Y/n/?] y Enable debugging of rseq() system call (DEBUG_RSEQ) [N/y/?] n Enable cachestat() system call (CACHESTAT_SYSCALL) [Y/n/?] y PC/104 support (PC104) [N/y/?] n Load all symbols for debugging/ksymoops (KALLSYMS) [Y/?] y Test the basic functions and performance of kallsyms (KALLSYMS_SELFTEST) [N/y/?] n Include all symbols in kallsyms (KALLSYMS_ALL) [Y/n/?] y Profiling support (PROFILING) [Y/n/?] y * * Enable loadable module support * Enable loadable module support (MODULES) [Y/n/?] y Module debugging (MODULE_DEBUG) [N/y/?] n Forced module loading (MODULE_FORCE_LOAD) [Y/n/?] y Module unloading (MODULE_UNLOAD) [Y/n/?] y Forced module unloading (MODULE_FORCE_UNLOAD) [Y/n/?] y Tainted module unload tracking (MODULE_UNLOAD_TAINT_TRACKING) [N/y/?] n Module versioning support (MODVERSIONS) [Y/n/?] y Source checksum for all modules (MODULE_SRCVERSION_ALL) [N/y/?] n Module signature verification (MODULE_SIG) [Y/?] y Require modules to be validly signed (MODULE_SIG_FORCE) [N/y/?] n Automatically sign all modules (MODULE_SIG_ALL) [Y/n/?] (NEW) Hash algorithm to sign modules 1. SHA-1 (MODULE_SIG_SHA1) > 2. SHA-256 (MODULE_SIG_SHA256) 3. SHA-384 (MODULE_SIG_SHA384) 4. SHA-512 (MODULE_SIG_SHA512) 5. SHA3-256 (MODULE_SIG_SHA3_256) 6. SHA3-384 (MODULE_SIG_SHA3_384) 7. SHA3-512 (MODULE_SIG_SHA3_512) choice[1-7?]: 2 Module compression (MODULE_COMPRESS) [Y/n/?] y Module compression type 1. GZIP (MODULE_COMPRESS_GZIP) > 2. XZ (MODULE_COMPRESS_XZ) 3. ZSTD (MODULE_COMPRESS_ZSTD) choice[1-3?]: 2 Automatically compress all modules (MODULE_COMPRESS_ALL) [Y/n/?] y Support in-kernel module decompression (MODULE_DECOMPRESS) [Y/n/?] y Allow loading of modules with missing namespace imports (MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS) [N/y/?] n Path to modprobe binary (MODPROBE_PATH) [/sbin/modprobe] /sbin/modprobe Trim unused exported kernel symbols (TRIM_UNUSED_KSYMS) [N/y/?] n * * Certificates for signature checking * File name or PKCS#11 URI of module signing key (MODULE_SIG_KEY) [certs/signing_key.pem] (NEW) Type of module signing key to be generated > 1. RSA (MODULE_SIG_KEY_TYPE_RSA) choice[1]: 1 Provide system-wide ring of trusted keys (SYSTEM_TRUSTED_KEYRING) [Y/?] y Additional X.509 keys for default system keyring (SYSTEM_TRUSTED_KEYS) [] (NEW) Reserve area for inserting a certificate without recompiling (SYSTEM_EXTRA_CERTIFICATE) [N/y/?] n Provide a keyring to which extra trustable keys may be added (SECONDARY_TRUSTED_KEYRING) [Y/n/?] y Only allow additional certs signed by keys on the builtin trusted keyring (SECONDARY_TRUSTED_KEYRING_SIGNED_BY_BUILTIN) [N/y/?] n Provide system-wide ring of blacklisted keys (SYSTEM_BLACKLIST_KEYRING) [Y/n/?] y Hashes to be preloaded into the system blacklist keyring (SYSTEM_BLACKLIST_HASH_LIST) [] Provide system-wide ring of revocation certificates (SYSTEM_REVOCATION_LIST) [N/y/?] n Allow root to add signed blacklist keys (SYSTEM_BLACKLIST_AUTH_UPDATE) [N/y/?] n # # configuration written to .config # -- System Information: Debian Release: 13.0 APT prefers stable-updates APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable') Architecture: amd64 (x86_64) Kernel: Linux 6.16.3-200.fc42.x86_64 (SMP w/8 CPU threads; PREEMPT) Kernel taint flags: TAINT_WARN Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8), LANGUAGE not set Shell: /bin/sh linked to /usr/bin/dash Init: unable to detect -- no debconf information
