XPost: linux.debian.bugs.dist 
 From: sascha-debian-bugs-initramfs-tools-20250807@silbe.org 
  
 reassign 1110545 src:glibc 
 forcemerge 1079443 1110545 
 found 1079443 2.41-12 
 affects 1079443 initramfs-tools 
 affects 1079443 dracut-install 
 thanks 
  
 Dear Maintainer, 
  
 after running into a related issue (network drivers missing as well) I 
 spent several days debugging this and finally figured out that it is 
 caused by a known bug in glibc that even had the same symptoms when it 
 was initially reported in Debian a year ago (the title was 
 "dracut-install ... -m =drivers/XXX is ignored"): 
  
 #1079443 src:glibc: fts_* calling non-LFS __readdir [1] 
  
 mkinitramfs uses dracut-install to install kernel modules in the 
 initramfs. dracut-install uses fts_open() + fts_read() to find the 
 modules in the file system. The glibc implementation of fts_open() + 
 fts_read() is broken when running in qemu-arm (qemu-user) on amd64 (and 
 possibly in other circumstances as well). 
  
 The upstream ticket glibc#23960 [2] is even older, dating back to 2018 
 and glibc 2.28. The reason it only started affecting initramfs-tools in 
 Trixie is that since initramfs-tools commit d730a393 ("Replace 
 copy_modules_dir by manual_add_modules calls") mkinitramfs uses 
 dracut-install filters instead of find (for entire directories) and 
 explicit module lists (for individual modules). 
  
 Given that there's been no progress on the glibc bug since 2022 it would 
 probably be best for dracut-install to stop using the non-POSIX (and 
 thus rarely used and not thoroughly tested) fts_open() + fts_read(). 
  
 Sascha Silbe 
  
 [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1079443 
 [2] https://sourceware.org/bugzilla/show_bug.cgi?id=23960 
  
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