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Thu, 5 Mar 2026 14:14:41 +0000 Message-ID: <499ca787-0971-455a-9fc6-ae9d91981678@siemens.com> Date: Thu, 5 Mar 2026 15:14:37 +0100 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4] trixie: Workaround with missing drivers in initramfs To: Zhihang Wei , isar-users@googlegroups.com References: <20260305140933.1515497-1-wzh@ilbers.de> From: "'Jan Kiszka' via isar-users" Content-Language: en-US Autocrypt: addr=jan.kiszka@siemens.com; keydata= xsFNBGZY+hkBEACkdtFD81AUVtTVX+UEiUFs7ZQPQsdFpzVmr6R3D059f+lzr4Mlg6KKAcNZ uNUqthIkgLGWzKugodvkcCK8Wbyw+1vxcl4Lw56WezLsOTfu7oi7Z0vp1XkrLcM0tofTbClW xMA964mgUlBT2m/J/ybZd945D0wU57k/smGzDAxkpJgHBrYE/iJWcu46jkGZaLjK4xcMoBWB I6hW9Njxx3Ek0fpLO3876bszc8KjcHOulKreK+ezyJ01Hvbx85s68XWN6N2ulLGtk7E/sXlb 79hylHy5QuU9mZdsRjjRGJb0H9Buzfuz0XrcwOTMJq7e7fbN0QakjivAXsmXim+s5dlKlZjr L3ILWte4ah7cGgqc06nFb5jOhnGnZwnKJlpuod3pc/BFaFGtVHvyoRgxJ9tmDZnjzMfu8YrA +MVv6muwbHnEAeh/f8e9O+oeouqTBzgcaWTq81IyS56/UD6U5GHet9Pz1MB15nnzVcyZXIoC roIhgCUkcl+5m2Z9G56bkiUcFq0IcACzjcRPWvwA09ZbRHXAK/ao/+vPAIMnU6OTx3ejsbHn oh6VpHD3tucIt+xA4/l3LlkZMt5FZjFdkZUuAVU6kBAwElNBCYcrrLYZBRkSGPGDGYZmXAW/ VkNUVTJkRg6MGIeqZmpeoaV2xaIGHBSTDX8+b0c0hT/Bgzjv8QARAQABzSNKYW4gS2lzemth IDxqYW4ua2lzemthQHNpZW1lbnMuY29tPsLBlAQTAQoAPhYhBABMZH11cs99cr20+2mdhQqf QXvYBQJmWPvXAhsDBQkFo5qABQsJCAcCBhUKCQgLAgQWAgMBAh4BAheAAAoJEGmdhQqfQXvY zPAP/jGiVJ2VgPcRWt2P8FbByfrJJAPCsos+SZpncRi7tl9yTEpS+t57h7myEKPdB3L+kxzg K3dt1UhYp4FeIHA3jpJYaFvD7kNZJZ1cU55QXrJI3xu/xfB6VhCs+VAUlt7XhOsOmTQqCpH7 pRcZ5juxZCOxXG2fTQTQo0gfF5+PQwQYUp0NdTbVox5PTx5RK3KfPqmAJsBKdwEaIkuY9FbM 9lGg8XBNzD2R/13cCd4hRrZDtyegrtocpBAruVqOZhsMb/h7Wd0TGoJ/zJr3w3WnDM08c+RA 5LHMbiA29MXq1KxlnsYDfWB8ts3HIJ3ROBvagA20mbOm26ddeFjLdGcBTrzbHbzCReEtN++s gZneKsYiueFDTxXjUOJgp8JDdVPM+++axSMo2js8TwVefTfCYt0oWMEqlQqSqgQwIuzpRO6I ik7HAFq8fssy2cY8Imofbj77uKz0BNZC/1nGG1OI9cU2jHrqsn1i95KaS6fPu4EN6XP/Gi/O 0DxND+HEyzVqhUJkvXUhTsOzgzWAvW9BlkKRiVizKM6PLsVm/XmeapGs4ir/U8OzKI+SM3R8 VMW8eovWgXNUQ9F2vS1dHO8eRn2UqDKBZSo+qCRWLRtsqNzmU4N0zuGqZSaDCvkMwF6kIRkD ZkDjjYQtoftPGchLBTUzeUa2gfOr1T4xSQUHhPL8zsFNBGZY+hkBEADb5quW4M0eaWPIjqY6 aC/vHCmpELmS/HMa5zlA0dWlxCPEjkchN8W4PB+NMOXFEJuKLLFs6+s5/KlNok/kGKg4fITf Vcd+BQd/YRks3qFifckU+kxoXpTc2bksTtLuiPkcyFmjBph/BGms35mvOA0OaEO6fQbauiHa QnYrgUQM+YD4uFoQOLnWTPmBjccoPuiJDafzLxwj4r+JH4fA/4zzDa5OFbfVq3ieYGqiBrtj tBFv5epVvGK1zoQ+Rc+h5+dCWPwC2i3cXTUVf0woepF8mUXFcNhY+Eh8vvh1lxfD35z2CJeY txMcA44Lp06kArpWDjGJddd+OTmUkFWeYtAdaCpj/GItuJcQZkaaTeiHqPPrbvXM361rtvaw XFUzUlvoW1Sb7/SeE/BtWoxkeZOgsqouXPTjlFLapvLu5g9MPNimjkYqukASq/+e8MMKP+EE v3BAFVFGvNE3UlNRh+ppBqBUZiqkzg4q2hfeTjnivgChzXlvfTx9M6BJmuDnYAho4BA6vRh4 Dr7LYTLIwGjguIuuQcP2ENN+l32nidy154zCEp5/Rv4K8SYdVegrQ7rWiULgDz9VQWo2zAjo TgFKg3AE3ujDy4V2VndtkMRYpwwuilCDQ+Bpb5ixfbFyZ4oVGs6F3jhtWN5Uu43FhHSCqUv8 FCzl44AyGulVYU7hTQARAQABwsF8BBgBCgAmFiEEAExkfXVyz31yvbT7aZ2FCp9Be9gFAmZY +hkCGwwFCQWjmoAACgkQaZ2FCp9Be9hN3g/8CdNqlOfBZGCFNZ8Kf4tpRpeN3TGmekGRpohU bBMvHYiWW8SvmCgEuBokS+Lx3pyPJQCYZDXLCq47gsLdnhVcQ2ZKNCrr9yhrj6kHxe1Sqv1S MhxD8dBqW6CFe/mbiK9wEMDIqys7L0Xy/lgCFxZswlBW3eU2Zacdo0fDzLiJm9I0C9iPZzkJ gITjoqsiIi/5c3eCY2s2OENL9VPXiH1GPQfHZ23ouiMf+ojVZ7kycLjz+nFr5A14w/B7uHjz uL6tnA+AtGCredDne66LSK3HD0vC7569sZ/j8kGKjlUtC+zm0j03iPI6gi8YeCn9b4F8sLpB lBdlqo9BB+uqoM6F8zMfIfDsqjB0r/q7WeJaI8NKfFwNOGPuo93N+WUyBi2yYCXMOgBUifm0 T6Hbf3SHQpbA56wcKPWJqAC2iFaxNDowcJij9LtEqOlToCMtDBekDwchRvqrWN1mDXLg+av8 qH4kDzsqKX8zzTzfAWFxrkXA/kFpR3JsMzNmvextkN2kOLCCHkym0zz5Y3vxaYtbXG2wTrqJ 8WpkWIE8STUhQa9AkezgucXN7r6uSrzW8IQXxBInZwFIyBgM0f/fzyNqzThFT15QMrYUqhhW ZffO4PeNJOUYfXdH13A6rbU0y6xE7Okuoa01EqNi9yqyLA8gPgg/DhOpGtK8KokCsdYsTbk= In-Reply-To: <20260305140933.1515497-1-wzh@ilbers.de> Content-Type: text/plain; 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dkim=pass header.i=@siemens.com header.s=selector2 header.b=B+aSBsTr; arc=pass (i=1 spf=pass spfdomain=siemens.com dkim=pass dkdomain=siemens.com dmarc=pass fromdomain=siemens.com); spf=pass (google.com: domain of jan.kiszka@siemens.com designates 2a01:111:f403:c200::1 as permitted sender) smtp.mailfrom=jan.kiszka@siemens.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=siemens.com X-Original-From: Jan Kiszka Reply-To: Jan Kiszka Precedence: list Mailing-list: list isar-users@googlegroups.com; contact isar-users+owners@googlegroups.com List-ID: X-Spam-Checked-In-Group: isar-users@googlegroups.com X-Google-Group-Id: 914930254986 List-Post: , List-Help: , List-Archive: , List-Unsubscribe: , X-Spam-Status: No, score=-4.9 required=5.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,MAILING_LIST_MULTI, RCVD_IN_DNSWL_BLOCKED,RCVD_IN_MSPIKE_H2,RCVD_IN_RP_CERTIFIED, RCVD_IN_RP_RNBL,RCVD_IN_RP_SAFE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on shymkent.ilbers.de X-TUID: zR2rwoXScNa3 On 05.03.26 15:09, Zhihang Wei wrote: > This is a workaround for the booting issue on several Trixie > targets, which is caused by missing drivers in their initramfs. > > Starting with Debian Trixie, update-initramfs invokes "dracut-install" > to collect and install required drivers into the generated initramfs. > "dracut-install" relies on fts_open() / fts_read() from glibc to > traverse directories and locate drivers. > > Due to a long-standing bug [1] between qemu and glibc, the fts_* > functions may fail to find files on certain 32-bit architectures. As a > result, some required modules are not detected and not added to the > initramfs. The produced image then fails to boot. > It's known that at least these targets under Trixie are affected: > - qemuarm (missing virtio_blk) > - bananapi (missing sunxi_mmc) > - nanopi-neo (missing sunxi_mmc) > > A similiar dracut bug report was filed in 2024 [2], pointing to this > upstream glibc issue reported in 2018 [1]. No upstream fix has been > applied, and the issue appears to affect only qemu builds for specific > 32-bit targets. > > As a temporary workaround, use a customized initramfs-hook to append > the neccessary drivers that are currently missed from the initramfs. > > For a complete fix, we either need to push for an upstream glibc/qemu > fix, or convince dracut to avoid using these non-POSIX fts_* functions > and use opendir() / readdir() instead. > > [1] https://sourceware.org/bugzilla/show_bug.cgi?id=23960 > [2] https://bugs-devel.debian.org/cgi-bin/bugreport.cgi?bug=1079443 > > This workaround applies only to initramfs images generated with > initramfs-tools. It does not apply to dracut-based initramfs > generation. When using dracut, drivers may also be missing due to the > same underlying issue, but the affected drivers may differ. > > Signed-off-by: Zhihang Wei > --- > Changes in v4: > - Move the hook recipe to meta-isar. > - Add notes on dracut. > > .../conf/multiconfig/bananapi-trixie.conf | 2 + > .../conf/multiconfig/nanopi-neo-trixie.conf | 2 + > .../conf/multiconfig/qemuarm-trixie.conf | 4 +- > .../initramfs-trixie-armhf-hook_0.1.bb | 63 +++++++++++++++++++ > 4 files changed, 70 insertions(+), 1 deletion(-) > create mode 100644 meta-isar/recipes-initramfs/initramfs-trixie-armhf-hook/initramfs-trixie-armhf-hook_0.1.bb > > diff --git a/meta-isar/conf/multiconfig/bananapi-trixie.conf b/meta-isar/conf/multiconfig/bananapi-trixie.conf > index 66f9db89..c2a9c667 100644 > --- a/meta-isar/conf/multiconfig/bananapi-trixie.conf > +++ b/meta-isar/conf/multiconfig/bananapi-trixie.conf > @@ -3,3 +3,5 @@ > > MACHINE ?= "bananapi" > DISTRO ?= "debian-trixie" > + > +IMAGE_INSTALL += "initramfs-trixie-armhf-hook" > diff --git a/meta-isar/conf/multiconfig/nanopi-neo-trixie.conf b/meta-isar/conf/multiconfig/nanopi-neo-trixie.conf > index 6e8f8a44..ee53e68d 100644 > --- a/meta-isar/conf/multiconfig/nanopi-neo-trixie.conf > +++ b/meta-isar/conf/multiconfig/nanopi-neo-trixie.conf > @@ -3,3 +3,5 @@ > > MACHINE ?= "nanopi-neo" > DISTRO ?= "debian-trixie" > + > +IMAGE_INSTALL += "initramfs-trixie-armhf-hook" > diff --git a/meta-isar/conf/multiconfig/qemuarm-trixie.conf b/meta-isar/conf/multiconfig/qemuarm-trixie.conf > index 5600ab23..5ec903a5 100644 > --- a/meta-isar/conf/multiconfig/qemuarm-trixie.conf > +++ b/meta-isar/conf/multiconfig/qemuarm-trixie.conf > @@ -1,7 +1,9 @@ > # This software is a part of Isar. > -# Copyright (C) 2024 ilbers GmbH > +# Copyright (C) 2024-2026 ilbers GmbH > # > # SPDX-License-Identifier: MIT > > MACHINE ?= "qemuarm" > DISTRO ?= "debian-trixie" > + > +IMAGE_INSTALL += "initramfs-trixie-armhf-hook" > diff --git a/meta-isar/recipes-initramfs/initramfs-trixie-armhf-hook/initramfs-trixie-armhf-hook_0.1.bb b/meta-isar/recipes-initramfs/initramfs-trixie-armhf-hook/initramfs-trixie-armhf-hook_0.1.bb > new file mode 100644 > index 00000000..1a8c85d9 > --- /dev/null > +++ b/meta-isar/recipes-initramfs/initramfs-trixie-armhf-hook/initramfs-trixie-armhf-hook_0.1.bb > @@ -0,0 +1,63 @@ > +# This software is a part of Isar. > +# Copyright (C) 2026 ilbers GmbH > +# > +# SPDX-License-Identifier: MIT > + > +MAINTAINER = "isar-users " > + > +inherit initramfs-hook > + > +# ----------------------------------------------------------------------------- > +# This recipe serves as an example workaround to add missing drivers to > +# the initramfs generated for Debian Trixie. The drivers are missing due > +# to an upstream bug in glibc/qemu. This issue caused booting issue on > +# several Trixie targets. > +# > +# Background: > +# > +# Starting with Debian Trixie, update-initramfs invokes "dracut-install" > +# to collect and install required drivers into the generated initramfs. > +# "dracut-install" relies on fts_open() / fts_read() from glibc to > +# traverse directories and locate drivers. > +# > +# Due to a long-standing bug [1] between qemu and glibc, the fts_* > +# functions may fail to find files on certain 32-bit architectures. As a > +# result, some required modules are not detected and not added to the > +# initramfs. The produced image then fails to boot. > +# > +# It's known that at least these targets under Trixie are affected: > +# - qemuarm (missing virtio_blk) > +# - bananapi (missing sunxi_mmc) > +# - nanopi-neo (missing sunxi_mmc) > +# > +# A similiar dracut bug report was filed in 2024 [2], pointing to this > +# upstream glibc issue reported in 2018 [1]. No upstream fix has been > +# applied, and the issue appears to affect only qemu builds for specific > +# 32-bit targets. > +# > +# [1] https://sourceware.org/bugzilla/show_bug.cgi?id=23960 > +# [2] https://bugs-devel.debian.org/cgi-bin/bugreport.cgi?bug=1079443 > +# > +# Purpose of this recipe: > +# > +# This recipe provides a temporary workaround by using a customized > +# initramfs hook to append drivers that are currently missing from > +# the initramfs, allowing the target to boot. > +# Notes for dracut users: > +# > +# This workaround applies only to initramfs images generated with > +# initramfs-tools. It does not apply to initramfs images generated > +# directly with dracut. > +# > +# When using dracut, drivers may also be missing due to the same > +# underlying glibc/qemu issue. However, the set of missing drivers > +# may differ from those observed with initramfs-tools. > +# > +# This hook recipe cannot be used together with dracut, as it requires > +# initramfs-tools to be installed, and dracut conflicts with > +# initramfs-tools. > +# ----------------------------------------------------------------------------- > + > +HOOK_ADD_MODULES:append:qemuarm:debian-trixie = "virtio-blk" > +HOOK_ADD_MODULES:append:bananapi:debian-trixie = "sunxi_mmc" > +HOOK_ADD_MODULES:append:nanopi-neo:debian-trixie = "sunxi_mmc" Reviewed-by: Jan Kiszka Thanks! Jan -- Siemens AG, Foundational Technologies Linux Expert Center -- You received this message because you are subscribed to the Google Groups "isar-users" group. 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