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Message-ID: <532DF2F2.6040005@gmail.com> Date: Sat, 22 Mar 2014 21:30:42 +0100 From: Francis Moreau <francis.moro@...il.com> To: Al Viro <viro@...IV.linux.org.uk> CC: LKML <linux-kernel@...r.kernel.org> Subject: Re: Can't umount /mnt/dev after calling dd(1) and with /mnt/dev is a bind mount Hello, On 03/22/2014 08:24 PM, Al Viro wrote: > On Sat, Mar 22, 2014 at 05:52:24PM +0100, Francis Moreau wrote: >> I'm posting here because it might be a behaviour related to the kernel >> internals that I can't explain from my user point of view :) >> >> Basically I'm doing this: >> >> mount -o bind /dev/ /mnt/dev && >> chroot /mnt dd bs=440 conv=notrunc count=1 if=gptmbr.bin of=/dev/loop0 >> umount /mnt/dev >> >> but umount gives the following error: "umount: /mnt/dev: target is busy" > > What do you have in /proc/self/mountinfo before all that? > here it is: $ cat /proc/self/mountinfo 15 19 0:3 / /proc rw,nosuid,nodev,noexec,relatime shared:5 - proc proc rw 16 19 0:14 / /sys rw,nosuid,nodev,noexec,relatime shared:6 - sysfs sys rw 17 19 0:5 / /dev rw,nosuid,relatime shared:2 - devtmpfs dev rw,size=8152392k,nr_inodes=2038098,mode=755 18 19 0:15 / /run rw,nosuid,nodev,relatime shared:12 - tmpfs run rw,mode=755 19 1 8:17 / / rw,relatime shared:1 - ext4 /dev/sdb1 rw,discard,data=ordered 20 16 0:16 / /sys/kernel/security rw,nosuid,nodev,noexec,relatime shared:7 - securityfs securityfs rw 21 17 0:17 / /dev/shm rw,nosuid,nodev shared:3 - tmpfs tmpfs rw 22 17 0:11 / /dev/pts rw,nosuid,noexec,relatime shared:4 - devpts devpts rw,gid=5,mode=620,ptmxmode=000 23 16 0:18 / /sys/fs/cgroup rw,nosuid,nodev,noexec shared:8 - tmpfs tmpfs rw,mode=755 24 23 0:19 / /sys/fs/cgroup/systemd rw,nosuid,nodev,noexec,relatime shared:9 - cgroup cgroup rw,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd 25 16 0:20 / /sys/fs/pstore rw,nosuid,nodev,noexec,relatime shared:10 - pstore pstore rw 26 16 0:21 / /sys/firmware/efi/efivars rw,nosuid,nodev,noexec,relatime shared:11 - efivarfs efivarfs rw 27 23 0:22 / /sys/fs/cgroup/cpuset rw,nosuid,nodev,noexec,relatime shared:13 - cgroup cgroup rw,cpuset 28 23 0:23 / /sys/fs/cgroup/cpu,cpuacct rw,nosuid,nodev,noexec,relatime shared:14 - cgroup cgroup rw,cpuacct,cpu 29 23 0:24 / /sys/fs/cgroup/memory rw,nosuid,nodev,noexec,relatime shared:15 - cgroup cgroup rw,memory 30 23 0:25 / /sys/fs/cgroup/devices rw,nosuid,nodev,noexec,relatime shared:16 - cgroup cgroup rw,devices 31 23 0:26 / /sys/fs/cgroup/freezer rw,nosuid,nodev,noexec,relatime shared:17 - cgroup cgroup rw,freezer 32 23 0:27 / /sys/fs/cgroup/net_cls rw,nosuid,nodev,noexec,relatime shared:18 - cgroup cgroup rw,net_cls 33 23 0:28 / /sys/fs/cgroup/blkio rw,nosuid,nodev,noexec,relatime shared:19 - cgroup cgroup rw,blkio 34 15 0:29 / /proc/sys/fs/binfmt_misc rw,relatime shared:20 - autofs systemd-1 rw,fd=21,pgrp=1,timeout=300,minproto=5,maxproto=5,direct 35 16 0:7 / /sys/kernel/debug rw,relatime shared:21 - debugfs debugfs rw 36 17 0:13 / /dev/mqueue rw,relatime shared:22 - mqueue mqueue rw 37 17 0:30 / /dev/hugepages rw,relatime shared:23 - hugetlbfs hugetlbfs rw 39 16 0:32 / /sys/kernel/config rw,relatime shared:24 - configfs configfs rw 38 19 0:31 / /tmp rw shared:25 - tmpfs tmpfs rw 40 34 0:33 / /proc/sys/fs/binfmt_misc rw,relatime shared:26 - binfmt_misc binfmt_misc rw 42 19 8:1 / /boot rw,relatime shared:27 - vfat /dev/sda1 rw,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro 43 19 254:0 / /home rw,relatime shared:28 - ext4 /dev/bcache0 rw,data=ordered 77 18 0:35 / /run/user/1000 rw,nosuid,nodev,relatime shared:61 - tmpfs tmpfs rw,size=1631108k,mode=700,uid=1000,gid=100 79 16 0:36 / /sys/fs/fuse/connections rw,relatime shared:63 - fusectl fusectl rw 81 77 0:37 / /run/user/1000/gvfs rw,nosuid,nodev,relatime shared:65 - fuse.gvfsd-fuse gvfsd-fuse rw,user_id=1000,group_id=100 44 19 7:2 / /mnt rw,relatime shared:29 - ext4 /dev/loop0p2 rw,data=ordered Thanks -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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