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If a shell is started from a (sub)mounted filesystem, then exited, that fs can no longer be unmounted (boot required).
ash
sash
sh
TLVC 0.6.0 login: root tlvc17# mount /dev/dhda2 /mnt MINIX: inodes 21845 imap 3 zmap 8, first data 696 MINIX-fs: mounting unchecked file system 0x502, running fsck is recommended. tlvc17# umount /mnt tlvc17# fsck -a /dev/rdhda2 Filesystem on /dev/rdhda2 is dirty, needs checking. tlvc17# fsck -a /dev/rdhda1 Filesystem on /dev/rdhda1 is dirty, needs checking. tlvc17# !mo mount /dev/dhda2 /mnt MINIX: inodes 21845 imap 3 zmap 8, first data 696 tlvc17# /mnt/bin/sh # df Filesystem 1K-blocks Free Used % FUsed% Mounted on /dev/dhda3 65535 62984 2551 4% 1% / /dev/dhda2 65535 63707 1828 3% 1% /mnt # ^D tlvc17# !um umount /mnt /mnt: Device or resource busy <----- cannot unmount even if process is gone tlvc17# mount /dev/dhda1 /mnt2 <--- mounting a different fs this time MINIX: inodes 21845 imap 3 zmap 8, first data 696 tlvc17# /mnt2/bin/sash <----- try sash # ls /mnt2 . .. 386.linux bin bootopts bootopts.386 dev etc good.linux linux mnt root tmp # ^D tlvc17# umount /mnt2 <----- no problem unmounting tlvc17# mount /dev/dhda4 /mnt2 <----- mounting FAT fs FAT: me=f8,csz=16,#f=2,floc=1,fsz=147,rloc=295,#d=512,dloc=327,#s=601776,ts=601776 FAT: total 300M, fat16 format tlvc17# /mnt2/bin/sh /mnt2/bin/sh: not found tlvc17# cp /bin/sh /mnt2/bin/ tlvc17# sync tlvc17# /mnt2/bin/sh # pwd /root # ^D tlvc17# umount /mnt2 /mnt2: Device or resource busy <----- again, umount is blocked tlvc17# df Filesystem 1K-blocks Free Used % FUsed% Mounted on /dev/dhda3 65535 62984 2551 4% 1% / /dev/dhda2 65535 63707 1828 3% 1% /mnt /dev/dhda4 300883 295112 5771 2% /mnt2 (FAT) tlvc17# ps PID GRP TTY USER STAT CPU HEAP FREE SIZE COMMAND 1 0 root S 0 3072 2014 12944 /bin/init 3 12 12 1 root S 0 1188 13330 71280 -/bin/sh 13 13 S0 root S 0 2280 12316 71280 -/bin/sh 14 14 S2 root S 0 0 1976 8512 /bin/getty /dev/ttyS2 57600 42 13 S0 root R 0 1024 1176 11680 ps 6 6 root S 0 1024 34738 75824 ktcp -b -p ne0 10.0.2.17 10.0.2.2 255.255.255.0 8 8 root S 0 0 1998 9744 telnetd 10 2 S0 root S 0 0 7306 28672 ftpd -d tlvc17# umount /mnt /mnt: Device or resource busy tlvc17# umount /mnt2 /mnt2: Device or resource busy tlvc17#
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If a shell is started from a (sub)mounted filesystem, then exited, that fs can no longer be unmounted (boot required).
ash
only,sash
is fineI haven't investigated yet, but it seems
sh
may be leaving open file descriptors behind somehow.The text was updated successfully, but these errors were encountered: