[22.03] tools/pkgconf: meson: OSError: [Errno 5] Input/output error: 'selinuxenabled'

[bersbersbers]

Installing libpkgconf.a to /home/bers/openwrt/staging_dir/host/lib
Installing pkgconf to /home/bers/openwrt/staging_dir/host/bin
Installing /home/bers/openwrt/build_dir/host/pkgconf-1.8.0/libpkgconf/libpkgconf.h to /home/bers/openwrt/staging_dir/host/include/pkgconf/libpkgconf
Installing /home/bers/openwrt/build_dir/host/pkgconf-1.8.0/libpkgconf/stdinc.h to /home/bers/openwrt/staging_dir/host/include/pkgconf/libpkgconf
Installing /home/bers/openwrt/build_dir/host/pkgconf-1.8.0/libpkgconf/iter.h to /home/bers/openwrt/staging_dir/host/include/pkgconf/libpkgconf
Installing /home/bers/openwrt/build_dir/host/pkgconf-1.8.0/libpkgconf/bsdstubs.h to /home/bers/openwrt/staging_dir/host/include/pkgconf/libpkgconf
Installing /home/bers/openwrt/build_dir/host/pkgconf-1.8.0/libpkgconf/libpkgconf-api.h to /home/bers/openwrt/staging_dir/host/include/pkgconf/libpkgconf
Installing /home/bers/openwrt/build_dir/host/pkgconf-1.8.0/man/pkgconf.1 to /home/bers/openwrt/staging_dir/host/share/man/man1
Installing /home/bers/openwrt/build_dir/host/pkgconf-1.8.0/man/pkg.m4.7 to /home/bers/openwrt/staging_dir/host/share/man/man7
Installing /home/bers/openwrt/build_dir/host/pkgconf-1.8.0/man/pc.5 to /home/bers/openwrt/staging_dir/host/share/man/man5
Installing /home/bers/openwrt/build_dir/host/pkgconf-1.8.0/man/pkgconf-personality.5 to /home/bers/openwrt/staging_dir/host/share/man/man5
Installing /home/bers/openwrt/build_dir/host/pkgconf-1.8.0/openwrt-build/meson-private/libpkgconf.pc to /home/bers/openwrt/staging_dir/host/lib/pkgconfig
Installing /home/bers/openwrt/build_dir/host/pkgconf-1.8.0/pkg.m4 to /home/bers/openwrt/staging_dir/host/share/aclocal
Installing /home/bers/openwrt/build_dir/host/pkgconf-1.8.0/AUTHORS to /home/bers/openwrt/staging_dir/host/share/doc/pkgconf
Installing /home/bers/openwrt/build_dir/host/pkgconf-1.8.0/README.md to /home/bers/openwrt/staging_dir/host/share/doc/pkgconf
Traceback (most recent call last):
  File "/home/bers/openwrt/staging_dir/host/bin/meson.py/mesonbuild/mesonmain.py", line 146, in run
    return options.run_func(options)
  File "/home/bers/openwrt/staging_dir/host/bin/meson.py/mesonbuild/minstall.py", line 811, in run
    installer.do_install(datafilename)
  File "/home/bers/openwrt/staging_dir/host/bin/meson.py/mesonbuild/minstall.py", line 593, in do_install
    self.restore_selinux_contexts(destdir)
  File "/home/bers/openwrt/staging_dir/host/bin/meson.py/mesonbuild/minstall.py", line 385, in restore_selinux_contexts
    restore_selinux_contexts()
  File "/home/bers/openwrt/staging_dir/host/bin/meson.py/mesonbuild/minstall.py", line 231, in restore_selinux_contexts
    subprocess.check_call(['selinuxenabled'])
  File "/usr/lib/python3.8/subprocess.py", line 359, in check_call
    retcode = call(*popenargs, **kwargs)
  File "/usr/lib/python3.8/subprocess.py", line 340, in call
    with Popen(*popenargs, **kwargs) as p:
  File "/usr/lib/python3.8/subprocess.py", line 858, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/usr/lib/python3.8/subprocess.py", line 1704, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
OSError: [Errno 5] Input/output error: 'selinuxenabled'

ERROR: Unhandled python exception

    This is a Meson bug and should be reported!
FAILED: meson-install
/home/bers/openwrt/staging_dir/host/bin/python3 /home/bers/openwrt/staging_dir/host/bin/meson.py install --no-rebuild
ninja: build stopped: subcommand failed.
make[3]: *** [Makefile:38: /home/bers/openwrt/staging_dir/host/stamp/.pkgconf_installed] Error 1
make[3]: Leaving directory '/home/bers/openwrt/tools/pkgconf'
time: tools/pkgconf/compile#2.62#0.25#3.04
    ERROR: tools/pkgconf failed to build.
make[2]: *** [tools/Makefile:168: tools/pkgconf/compile] Error 1
make[2]: Leaving directory '/home/bers/openwrt'
make[1]: *** [tools/Makefile:164: /home/bers/openwrt/staging_dir/host/stamp/.tools_compile_yyynyynnyyyynyyyyyynyynnyynyyyyyyyyyyyyyyyyyyynynyyyyyyyyy] Error 2
make[1]: Leaving directory '/home/bers/openwrt'
make: *** [/home/bers/openwrt/include/toplevel.mk:230: world] Error 2

[bersbersbers]

apt install selinux-utils seems to fix this error, but I had expected one of the config steps before to catch that. The need to install selinux-utils does not seem to be documented anywhere: https://www.google.com/search?q=%22openwrt%22+%22selinux-utils%22

[ynezz]

@bersbersbers can you share output of ./scripts/diffconfig.sh command or ideally find out, which config option (or combination) triggers this issue? Maybe it's due to CONFIG_SELINUX=y enabled?

[bersbersbers]

@ynezz sure, see below! I don't see CONFIG_SELINUX anywhere, though. I followed the approach described in https://forum.openwrt.org/t/openwrt-19-07-x-ath79-tiny-luci/55458/121 with 22.03.0 and https://openwrt.ashus.net/21.02.3-targets-ath79-tiny-luci/config on cleanly installed Ubuntu 20.04 in WSL (after only apt install python3, and that's it - so it may very well be in the toolchain).

bers:~/openwrt$ ./scripts/diffconfig.sh
tmp/.config-package.in:53765:error: recursive dependency detected!
tmp/.config-package.in:53765:   symbol PACKAGE_libgd is selected by PACKAGE_libgd-full
tmp/.config-package.in:53799:   symbol PACKAGE_libgd-full depends on PACKAGE_libgd
For a resolution refer to Documentation/kbuild/kconfig-language.rst
subsection "Kconfig recursive dependency limitations"

tmp/.config-package.in:53765:error: recursive dependency detected!
tmp/.config-package.in:53765:   symbol PACKAGE_libgd is selected by PACKAGE_libgd-full
tmp/.config-package.in:53799:   symbol PACKAGE_libgd-full depends on PACKAGE_libgd
For a resolution refer to Documentation/kbuild/kconfig-language.rst
subsection "Kconfig recursive dependency limitations"

CONFIG_TARGET_ath79=y
CONFIG_TARGET_ath79_tiny=y
CONFIG_TARGET_ath79_tiny_DEVICE_tplink_tl-wr841-v9=y
CONFIG_BUSYBOX_CUSTOM=y
CONFIG_BUSYBOX_CONFIG_ASH_OPTIMIZE_FOR_SIZE=y
CONFIG_BUSYBOX_CONFIG_BUNZIP2=y
CONFIG_BUSYBOX_CONFIG_BZCAT=y
CONFIG_BUSYBOX_CONFIG_FEATURE_BZIP2_DECOMPRESS=y
CONFIG_BUSYBOX_CONFIG_FEATURE_HTTPD_CGI=y
CONFIG_BUSYBOX_CONFIG_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR=y
CONFIG_BUSYBOX_CONFIG_FEATURE_HTTPD_ETAG=y
CONFIG_BUSYBOX_CONFIG_FEATURE_HTTPD_PORT_DEFAULT=80
# CONFIG_BUSYBOX_CONFIG_FEATURE_VERBOSE_USAGE is not set
CONFIG_BUSYBOX_CONFIG_HTTPD=y
# CONFIG_BUSYBOX_CONFIG_LONG_OPTS is not set
# CONFIG_BUSYBOX_CONFIG_NSLOOKUP is not set
# CONFIG_BUSYBOX_CONFIG_SWAPOFF is not set
CONFIG_CLEAN_IPKG=y
# CONFIG_JSON_OVERVIEW_IMAGE_INFO is not set
# CONFIG_KERNEL_PRINTK is not set
CONFIG_LUCI_SRCDIET=y
# CONFIG_PACKAGE_ca-bundle is not set
CONFIG_PACKAGE_cgi-io=y
# CONFIG_PACKAGE_dnsmasq is not set
CONFIG_PACKAGE_firewall=y
# CONFIG_PACKAGE_firewall4 is not set
CONFIG_PACKAGE_igmpproxy=y
CONFIG_PACKAGE_kmod-ip6tables=y
CONFIG_PACKAGE_kmod-ipt-conntrack=y
CONFIG_PACKAGE_kmod-ipt-core=y
CONFIG_PACKAGE_kmod-ipt-nat=y
CONFIG_PACKAGE_kmod-ipt-offload=y
# CONFIG_PACKAGE_kmod-lib-crc-ccitt is not set
CONFIG_PACKAGE_kmod-nf-ipt=y
CONFIG_PACKAGE_kmod-nf-ipt6=y
CONFIG_PACKAGE_kmod-nls-base=y
CONFIG_PACKAGE_kmod-phy-ath79-usb=y
# CONFIG_PACKAGE_kmod-ppp is not set
CONFIG_PACKAGE_kmod-usb-chipidea=y
CONFIG_PACKAGE_kmod-usb-chipidea2=y
CONFIG_PACKAGE_kmod-usb-core=y
CONFIG_PACKAGE_kmod-usb-ehci=y
CONFIG_PACKAGE_kmod-usb-gadget=y
CONFIG_PACKAGE_kmod-usb-ledtrig-usbport=y
CONFIG_PACKAGE_kmod-usb-phy-nop=y
CONFIG_PACKAGE_kmod-usb-roles=y
CONFIG_PACKAGE_kmod-usb2=y
CONFIG_PACKAGE_libip4tc=y
CONFIG_PACKAGE_libip6tc=y
CONFIG_PACKAGE_libiptext=y
CONFIG_PACKAGE_libiptext6=y
CONFIG_PACKAGE_libiwinfo-lua=y
CONFIG_PACKAGE_liblua=y
CONFIG_PACKAGE_liblucihttp=y
CONFIG_PACKAGE_liblucihttp-lua=y
# CONFIG_PACKAGE_libpthread is not set
CONFIG_PACKAGE_libubus-lua=y
# CONFIG_PACKAGE_libustream-wolfssl is not set
# CONFIG_PACKAGE_libwolfssl is not set
CONFIG_PACKAGE_libxtables=y
CONFIG_PACKAGE_lua=y
CONFIG_PACKAGE_luci-app-firewall=y
CONFIG_PACKAGE_luci-base=y
CONFIG_PACKAGE_luci-lib-base=y
CONFIG_PACKAGE_luci-lib-ip=y
CONFIG_PACKAGE_luci-lib-jsonc=y
CONFIG_PACKAGE_luci-lib-nixio=y
CONFIG_PACKAGE_luci-mod-admin-full=y
CONFIG_PACKAGE_luci-mod-network=y
CONFIG_PACKAGE_luci-mod-status=y
CONFIG_PACKAGE_luci-mod-system=y
CONFIG_PACKAGE_luci-proto-ipv6=y
CONFIG_PACKAGE_luci-theme-bootstrap=y
# CONFIG_PACKAGE_odhcp6c is not set
# CONFIG_PACKAGE_odhcpd-ipv6only is not set
# CONFIG_PACKAGE_openwrt-keyring is not set
# CONFIG_PACKAGE_opkg is not set
# CONFIG_PACKAGE_ppp is not set
CONFIG_PACKAGE_rpcd=y
CONFIG_PACKAGE_rpcd-mod-file=y
CONFIG_PACKAGE_rpcd-mod-iwinfo=y
CONFIG_PACKAGE_rpcd-mod-luci=y
CONFIG_PACKAGE_uhttpd=y
# CONFIG_PACKAGE_usign is not set
# CONFIG_PACKAGE_wpad-basic-wolfssl is not set
CONFIG_PACKAGE_wpad-mini=y
# CONFIG_SIGNATURE_CHECK is not set
# CONFIG_SIGNED_PACKAGES is not set
CONFIG_STRIP_KERNEL_EXPORTS=y
# CONFIG_TARGET_ROOTFS_INITRAMFS is not set
CONFIG_USE_MKLIBS=y
# CONFIG_WPA_WOLFSSL is not set
CONFIG_PACKAGE_jansson=y
CONFIG_PACKAGE_kmod-nft-fib=y
CONFIG_PACKAGE_libmnl=y
CONFIG_PACKAGE_libnftnl=y
CONFIG_PACKAGE_libucode=y
CONFIG_PACKAGE_nftables-json=y
CONFIG_PACKAGE_ucode=y
CONFIG_PACKAGE_ucode-mod-fs=y
# CONFIG_PACKAGE_ucode-mod-math is not set
# CONFIG_PACKAGE_ucode-mod-nl80211 is not set
# CONFIG_PACKAGE_ucode-mod-resolv is not set
# CONFIG_PACKAGE_ucode-mod-rtnl is not set
# CONFIG_PACKAGE_ucode-mod-struct is not set
CONFIG_PACKAGE_ucode-mod-ubus=y
CONFIG_PACKAGE_ucode-mod-uci=y
# CONFIG_PACKAGE_ucode-mod-uloop is not set

Happy to help debugging further, but I don't see any immediate culprit and I don't really want to bisect this whole tree up there.

[neheb]

Related: mesonbuild/meson#10774

That is very strange.

[neheb]

Found the issue:

https://github.com/mesonbuild/meson/blob/master/mesonbuild/minstall.py#L236

I think this is a problem with WSL. Input/Output Error is the wrong thing to report when the "selinuxenabled" binary is missing.

edit: add a new file, tools/meson/patches/010-wsl.patch with the contents:

--- a/mesonbuild/minstall.py
+++ b/mesonbuild/minstall.py
@@ -235,7 +235,7 @@ def restore_selinux_contexts() -> None:
     '''
     try:
         subprocess.check_call(['selinuxenabled'])
-    except (FileNotFoundError, NotADirectoryError, PermissionError, subprocess.CalledProcessError):
+    except (FileNotFoundError, IOError, NotADirectoryError, PermissionError, subprocess.CalledProcessError):
         # If we don't have selinux or selinuxenabled returned 1, failure
         # is ignored quietly.
         return

[neheb]

I tried to reproduce on WSL1 18.04 and 20.04. Couldn't do it.

The only potential issues I can think of are: old Windows 10, old Ubuntu packages (sudo apt update;sudo apt upgrade), or some weird fs setup.

Are you running WSL1 or 2?

[bersbersbers]

I tried to reproduce on WSL1 18.04 and 20.04. Couldn't do it.

I still can, so let's see if I can help.

The only potential issues I can think of are: old Windows 10

Nope - 21H2.

old Ubuntu packages (sudo apt update;sudo apt upgrade)

TLDR: did not fix the issue.

Okay, so I went ahead to repro this quickly:

bers:~/openwrt/build_dir/host/pkgconf-1.8.0/openwrt-build$ sudo apt remove selinux-utils
bers:~/openwrt/build_dir/host/pkgconf-1.8.0/openwrt-build$ /home/bers/openwrt/staging_dir/host/bin/python3 /home/bers/openwrt/staging_dir/host/bin/meson.py install --no-rebuild

That now gives the same error again. Then:

bers:~/openwrt$ python3 -c "import subprocess; subprocess.check_call(['selinuxenabled'])"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.8/subprocess.py", line 359, in check_call
    retcode = call(*popenargs, **kwargs)
  File "/usr/lib/python3.8/subprocess.py", line 340, in call
    with Popen(*popenargs, **kwargs) as p:
  File "/usr/lib/python3.8/subprocess.py", line 858, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/usr/lib/python3.8/subprocess.py", line 1704, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
OSError: [Errno 5] Input/output error: 'selinuxenabled'

Same thing!

For the record:

bers:~/openwrt/build_dir/host/pkgconf-1.8.0/openwrt-build$ python2 -c "import subprocess; subprocess.check_call(['selinuxenabled'])"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python2.7/subprocess.py", line 185, in check_call
    retcode = call(*popenargs, **kwargs)
  File "/usr/lib/python2.7/subprocess.py", line 172, in call
    return Popen(*popenargs, **kwargs).wait()
  File "/usr/lib/python2.7/subprocess.py", line 394, in __init__
    errread, errwrite)
  File "/usr/lib/python2.7/subprocess.py", line 1047, in _execute_child
    raise child_exception
OSError: [Errno 5] Input/output error

bers:~/openwrt$ selinuxenabled
-bash: selinuxenabled: command not found

Now, sudo apt update; sudo apt upgrade:

The following packages will be upgraded:
  base-files curl dirmngr git git-man gnupg gnupg-l10n gnupg-utils gpg gpg-agent gpg-wks-client gpg-wks-server gpgconf gpgsm gpgv isc-dhcp-client isc-dhcp-common libcurl3-gnutls libcurl4 libcurl4-openssl-dev libfreetype-dev
  libfreetype6 libfreetype6-dev libgdk-pixbuf2.0-0 libgdk-pixbuf2.0-bin libgdk-pixbuf2.0-common libgnutls30 libharfbuzz0b libhttp-daemon-perl libnss3 libpython2.7-minimal libpython2.7-stdlib libssl-dev libssl1.1
  libtss2-esys0 libxml2 libxml2-dev linux-libc-dev motd-news-config openssl python2.7 python2.7-minimal r-base r-base-core r-base-dev r-base-html r-cran-cluster r-cran-mass r-cran-nlme r-cran-survival r-doc-html
  r-recommended rsync tzdata

Still, same OSError as above.

Related: https://github.com/python/cpython/blob/3.8/Lib/subprocess.py#L1678-L1704
(TLDR: an OSError does not seem unexpected.)

or some weird fs setup.

I am not aware of anything.

Are you running WSL1 or 2?

2:

C:\Users\bers>wsl -l -v
  NAME      STATE           VERSION
* Ubuntu    Stopped         2

edit: add a new file, tools/meson/patches/010-wsl.patch with the contents:

This looks like a useful given, given my output of python3 -c ... above. Is there any need to investigate further? What are you getting with python3 -c "import subprocess; subprocess.check_call(['selinuxenabled'])" if selinuxenabled is not installed?

By the way, IOError is OSError now (https://stackoverflow.com/questions/29347790/difference-between-ioerror-and-oserror).

[neheb]

mangix@DESKTOP-VIRSTQA ~> python3 -c "import subprocess; subprocess.check_call(['selinuxenabled'])"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.6/subprocess.py", line 306, in check_call
    retcode = call(*popenargs, **kwargs)
  File "/usr/lib/python3.6/subprocess.py", line 287, in call
    with Popen(*popenargs, **kwargs) as p:
  File "/usr/lib/python3.6/subprocess.py", line 729, in __init__
    restore_signals, start_new_session)
  File "/usr/lib/python3.6/subprocess.py", line 1364, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'selinuxenabled': 'selinuxenabled'

yet I don't get the pkgconf error... weird.

I'm running WSL1 though. IIRC WSL2 was using some plan9 thing. Forgot the details...

Did the patch fix it?

edit: ah I can't read. Mine throws FileNotFoundError, which meson handles.

[bersbersbers]

Did the patch fix it?

Looks like it, yes! /home/bers/openwrt/staging_dir/host/bin/python3 /home/bers/openwrt/staging_dir/host/bin/meson.py install --no-rebuild works now.

[neheb]

I'm still curious. What's the filesystem of the directory? (cat /proc/mounts) IOError indicates a bad driver.

[bersbersbers]

What's the filesystem of the directory? (cat /proc/mounts)

$ cat /proc/mounts
/dev/sdb / ext4 rw,relatime,discard,errors=remount-ro,data=ordered 0 0
tmpfs /mnt/wsl tmpfs rw,relatime 0 0
tools /init 9p ro,dirsync,relatime,aname=tools;fmask=022,loose,access=client,trans=fd,rfd=6,wfd=6 0 0
none /dev devtmpfs rw,nosuid,relatime,size=3202648k,nr_inodes=800662,mode=755 0 0
sysfs /sys sysfs rw,nosuid,nodev,noexec,noatime 0 0
proc /proc proc rw,nosuid,nodev,noexec,noatime 0 0
devpts /dev/pts devpts rw,nosuid,noexec,noatime,gid=5,mode=620,ptmxmode=000 0 0
none /run tmpfs rw,nosuid,noexec,noatime,mode=755 0 0
none /run/lock tmpfs rw,nosuid,nodev,noexec,noatime 0 0
none /run/shm tmpfs rw,nosuid,nodev,noatime 0 0
none /run/user tmpfs rw,nosuid,nodev,noexec,noatime,mode=755 0 0
binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc rw,relatime 0 0
tmpfs /sys/fs/cgroup tmpfs rw,nosuid,nodev,noexec,relatime,mode=755 0 0
drivers /usr/lib/wsl/drivers 9p ro,dirsync,nosuid,nodev,noatime,aname=drivers;fmask=222;dmask=222,mmap,access=client,msize=65536,trans=fd,rfd=4,wfd=4 0 0
lib /usr/lib/wsl/lib 9p ro,dirsync,nosuid,nodev,noatime,aname=lib;fmask=222;dmask=222,mmap,access=client,msize=65536,trans=fd,rfd=4,wfd=4 0 0
cgroup2 /sys/fs/cgroup/unified cgroup2 rw,nosuid,nodev,noexec,relatime,nsdelegate 0 0
cgroup /sys/fs/cgroup/cpuset cgroup rw,nosuid,nodev,noexec,relatime,cpuset 0 0
cgroup /sys/fs/cgroup/cpu cgroup rw,nosuid,nodev,noexec,relatime,cpu 0 0
cgroup /sys/fs/cgroup/cpuacct cgroup rw,nosuid,nodev,noexec,relatime,cpuacct 0 0
cgroup /sys/fs/cgroup/blkio cgroup rw,nosuid,nodev,noexec,relatime,blkio 0 0
cgroup /sys/fs/cgroup/memory cgroup rw,nosuid,nodev,noexec,relatime,memory 0 0
cgroup /sys/fs/cgroup/devices cgroup rw,nosuid,nodev,noexec,relatime,devices 0 0
cgroup /sys/fs/cgroup/freezer cgroup rw,nosuid,nodev,noexec,relatime,freezer 0 0
cgroup /sys/fs/cgroup/net_cls cgroup rw,nosuid,nodev,noexec,relatime,net_cls 0 0
cgroup /sys/fs/cgroup/perf_event cgroup rw,nosuid,nodev,noexec,relatime,perf_event 0 0
cgroup /sys/fs/cgroup/net_prio cgroup rw,nosuid,nodev,noexec,relatime,net_prio 0 0
cgroup /sys/fs/cgroup/hugetlb cgroup rw,nosuid,nodev,noexec,relatime,hugetlb 0 0
cgroup /sys/fs/cgroup/pids cgroup rw,nosuid,nodev,noexec,relatime,pids 0 0
cgroup /sys/fs/cgroup/rdma cgroup rw,nosuid,nodev,noexec,relatime,rdma 0 0
C:\134 /mnt/c 9p rw,dirsync,noatime,aname=drvfs;path=C:\;uid=1000;gid=1000;symlinkroot=/mnt/,mmap,access=client,msize=65536,trans=fd,rfd=8,wfd=8 0 0

Not sure what all of this is, but I guess these two are relevant:

/dev/sdb / ext4 rw,relatime,discard,errors=remount-ro,data=ordered 0 0
C:\134 /mnt/c 9p rw,dirsync,noatime,aname=drvfs;path=C:\;uid=1000;gid=1000;symlinkroot=/mnt/,mmap,access=client,msize=65536,trans=fd,rfd=8,wfd=8 0 0

Interestingly, today, I get only this, in the same directories I tried before:

$ python3 -c "import subprocess; subprocess.check_call(['selinuxenabled'])"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.8/subprocess.py", line 359, in check_call
    retcode = call(*popenargs, **kwargs)
  File "/usr/lib/python3.8/subprocess.py", line 340, in call
    with Popen(*popenargs, **kwargs) as p:
  File "/usr/lib/python3.8/subprocess.py", line 858, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/usr/lib/python3.8/subprocess.py", line 1704, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'selinuxenabled'

Strange indeed.

[neheb]

As in the upstream PR, I'm blaming 9p for this. WSL1 does not use it.

[bersbersbers]

Interestingly, today, I get only this, in the same directories I tried before:

$ python3 -c "import subprocess; subprocess.check_call(['selinuxenabled'])"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.8/subprocess.py", line 359, in check_call
    retcode = call(*popenargs, **kwargs)
  File "/usr/lib/python3.8/subprocess.py", line 340, in call
    with Popen(*popenargs, **kwargs) as p:
  File "/usr/lib/python3.8/subprocess.py", line 858, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/usr/lib/python3.8/subprocess.py", line 1704, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'selinuxenabled'

Yet, after building once more, I see this - in the same WSL session as before:

 make[3] -C package/utils/busybox compile
 make[2] package/install
make -r world: build failed. Please re-run make with -j1 V=s or V=sc for a higher verbosity level to see what's going onmake: *** [/home/bers/openwrt/include/toplevel.mk:230: world] Error 1

bers:~/openwrt$ python3 -c "import subprocess; subprocess.check_call(['selinuxenabled'])"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.8/subprocess.py", line 359, in check_call
    retcode = call(*popenargs, **kwargs)
  File "/usr/lib/python3.8/subprocess.py", line 340, in call
    with Popen(*popenargs, **kwargs) as p:
  File "/usr/lib/python3.8/subprocess.py", line 858, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/usr/lib/python3.8/subprocess.py", line 1704, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
OSError: [Errno 5] Input/output error: 'selinuxenabled'
bers:~/openwrt$

Again, the FileNotFoundError error turned into an OSError.

[neheb]

as upstream merged the fix, do you want this backported?

[ynezz]

as upstream merged the fix, do you want this backported?

is there any other way to fix this?

[neheb]

Avoid WSL2?

[Ansuel]

@neheb this is strange. wsl2 use plan9 from windows to expose wsl2 directory but internally it's just a plain ext4 in a vm... (as you can see from /proc/mounts)

Wonder if I can try to repro this and check if this bug is not fixed on new version of wsl2
(do we have some easy repro steps?)

[Shine-]

For the record, I'm building in WSL2 only for a long time already, using Debian Buster and Bullseye, and recently switched to Alpine 3.16 for the 22.03 branch.

I'm getting no such errors in either distro.

All my distros are prepared as described in the "build system setup" wiki entry, including trimming the PATH, since (sadly) no one yet felt like chasing the quotation bug that causes build failures with blanks in the PATH, that appeared sometime after 19.07.

So yes, clear repro steps would help to find the actual cause, since "it's WSL2" alone doesn't look like being the cause.

P.S. As Ansuel says, WSL2 is using normal ext4 in its VHD, not 9P. Only WSL1 is using some non-standard (fake) FS due to its non-VM nature.

P.P.S. WSL1 is working perfectly fine for me to build 22.03 as well - it's just painfully slow due to the additional interfacing layer on its fake FS.

[neheb]

@Shine- that's not why it's slow: microsoft/WSL#873 (comment) . It's windows itself.

@Ansuel since this was merged this can be closed.