Date: Sun, 16 Oct 2016 23:41:20 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 213549] /etc/rc remounts root readonly if /firstboot exists Message-ID: <bug-213549-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D213549 Bug ID: 213549 Summary: /etc/rc remounts root readonly if /firstboot exists Product: Base System Version: 11.0-STABLE Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: conf Assignee: freebsd-bugs@FreeBSD.org Reporter: mcdouga9@egr.msu.edu I have some custom system setup scripts that leverage "firstboot" support b= ut I discovered problems when trying them on FreeBSD 11 -stable and -release. The short version is /etc/rc attempts to remount the / partition as readonly (r= o) at the end after it deletes /firstboot. I think this issue originated with: https://svnweb.freebsd.org/base?view=3Drevision&revision=3D293115 Abbreviated code: if [ -e ${firstboot_sentinel} ]; then [ ${root_rw_mount} =3D "yes" ] || mount -uw / chflags -R 0 ${firstboot_sentinel} rm -rf ${firstboot_sentinel} [ ${root_rw_mount} =3D "yes" ] || mount -ur / fi On a stock FreeBSD 11 install, if you touch /firstboot and reboot, here are= the results: UFS: prints "mount: /dev/vtbd0s1a: Device busy" late during boot but no apparent harm ZFS: succeeds in remounting / as ro even if it was rw to start with Depending on your system configuration you might notice the issue immediate= ly on the console, for example programs which need to write to / will start complaining. You can login and run mount -v to verify. Other random things = fail such as recording your login in 'w' output. I do not use ${firstboot_sentinel}-reboot which might be why this was not discovered, as= a reboot makes the problem go away but I do not want to reboot. Quick hack of a fix for me: comment out the last line containing "mount -ur= /" but this is not a proper fix. --=20 You are receiving this mail because: You are the assignee for the bug.=
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