Date: Fri, 24 Jan 2020 09:40:03 +0100
From: Natanael Copa <ncopa@alpinelinux.org>
To: alpine@zxv.nl
Cc: ~alpine/users@lists.alpinelinux.org
Subject: Re: kernel 5.5 busybox rm: can't remove: Directory not empty
Message-ID: <20200124094003.0345e3ab@ncopa-desktop.copa.dup.pw>
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References: <b3d29f07-32de-f9ca-3234-4da2291cf86b@foo>
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On Thu, 23 Jan 2020 23:39:17 +0100
alpine@zxv.nl wrote:

> While trying the kernel 5.5 release candidate for Fedora 31 I'm
> running into an issue with busybox rm where it seems unable to
> recursively remove directories with specific content, leaving one
> seemingly random file.
> 
> It doesn't happen with fedora's busybox, going back to kernel 5.4 or
> installing coreutils fixes the problem.

I wonder if this is related the lchown problem. There was a long thread
about that on musl libc mailing list: https://www.openwall.com/lists/musl/2020/01/22/7

What filesystem do you use?

Does it happen on other filesystems as well?

Can you reproduce it without docker? You can get the busybox-static.apk from 

http://dl-cdn.alpinelinux.org/alpine/v3.11/main/x86_64/busybox-static-1.31.1-r9.apk

(you can use `tar -zxf busybox-static-*.apk bin/busybox.static` to extract it)

Can you reproduce it when running `strace busybox rm -rf`?

Thanks!


 
> Steps to reproduce:
> 
> $ docker run -ti --rm alpine:3.11.3
> / # uname -a
> Linux 258313de78b9 5.5.0-0.rc6.git0.1.fc32.x86_64 #1 SMP Mon Jan 13
> 18:52:03 UTC 2020 x86_64 Linux / # wget
> https://github.com/michaelrsweet/htmldoc/releases/download/v1.9.7/htmldoc-1.9.7-source.tar.gz
> Connecting to github.com (140.82.118.4:443) Connecting to
> github-production-release-asset-2e65be.s3.amazonaws.com
> (52.216.22.11:443) saving to 'htmldoc-1.9.7-source.tar.gz'
> htmldoc-1.9.7-source 100%
> |****************************************************************************************************************|
> 4360k  0:00:00 ETA 'htmldoc-1.9.7-source.tar.gz' saved / # tar xf
> htmldoc-1.9.7-source.tar.gz / # rm -rf htmldoc-1.9.7 rm: can't remove
> 'htmldoc-1.9.7/fonts': Directory not empty rm: can't remove
> 'htmldoc-1.9.7/jpeg': Directory not empty / # rm -rf htmldoc-1.9.7
> / #
> 
> 
> Another reproducer where it breaks building docker php based images
> that add the mysqli extension:
> 
> $ docker run --rm php:alpine docker-php-ext-install mysqli
> fetch
> http://dl-cdn.alpinelinux.org/alpine/v3.11/main/x86_64/APKINDEX.tar.gz
> fetch
> http://dl-cdn.alpinelinux.org/alpine/v3.11/community/x86_64/APKINDEX.tar.gz
> (1/25) Installing m4 (1.4.18-r1) (2/25) Installing libbz2 (1.0.8-r1)
> (3/25) Installing perl (5.30.1-r0) ...
> (23/25) Purging mpc1 (1.1.0-r1)
> (24/25) Purging mpfr4 (4.0.2-r1)
> (25/25) Purging gmp (6.1.2-r1)
> Executing busybox-1.31.1-r9.trigger
> OK: 19 MiB in 32 packages
> rm: can't remove '/usr/src/php/sapi/phpdbg/tests': Directory not empty
> rm: can't remove '/usr/src/php/ext/sockets/tests': Directory not empty
> rm: can't remove '/usr/src/php/ext/ffi/tests': Directory not empty
> rm: can't remove '/usr/src/php/ext/gd/libgd': Directory not empty
> rm: can't remove '/usr/src/php/ext/soap/tests/soap12': Directory not
> empty rm: can't remove
> '/usr/src/php/ext/soap/tests/interop/Round3/GroupD': Directory not
> empty rm: can't remove '/usr/src/php/ext/mysqlnd': Directory not
> empty rm: can't remove '/usr/src/php/ext/ftp/tests': Directory not
> empty rm: can't remove '/usr/src/php/ext/phar/tests/tar/files':
> Directory not empty rm: can't remove '/usr/src/php/ext/hash/tests':
> Directory not empty rm: can't remove
> '/usr/src/php/ext/standard/tests/network': Directory not empty rm:
> can't remove '/usr/src/php/Zend/tests/return_types': Directory not
> empty $