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SubjectPROBLEM: umount report "busy" on r/o remount of root filesystem
Umount report "busy" when i try r/o remount the root filesystem at end
of
halt script. My halt script ends with:

# Begin of halt
kill -9 -1
umount -a
mount -n -o remount,ro /
halt
# End of halt

Umount (and mount on next line too) report "/: device is busy" and the
root filesystem
stay not correctly unmounted. But when i press magic key "u" (emergency
remount),
the filesystem is correctly remounted. All other mounted filesystems are
correctly unmounted by "umount -a". This bug is present only on my
motherboard with SiS5513
chipset; on other motherboard with VIA chipset and the totaly same linux
it's all right.
The second thing is, that on kernels 2.2.X (up to 2.2.13, later i've not
tested)
it's ok too. The version of mount has not any influence.

hardware:
Pentium 75, SiS chipset, 64MB RAM
HDD WDC AC36400L 6449MB, DMA disabled, PIO 4

software:
kernel 2.4.0-test7
gcc 2.95.2
binutils 2.10
mount 2.10o
glibc 2.1.3

Part of dmegs:

VFS: Diskquotas version dquot_6.4.0 initialized
CPU: Intel Pentium 75 - 200 stepping 05
Checking 386/387 coupling... OK, FPU using exception 16 error reporting.
Checking 'hlt' instruction... OK.
Intel Pentium with F0 0F bug - workaround enabled.
POSIX conformance testing by UNIFIX
PCI: PCI BIOS revision 2.10 entry at 0xfcb60, last bus=0
PCI: Using configuration type 1
PCI: Probing PCI hardware
...
Uniform Multi-Platform E-IDE driver Revision: 6.31
ide: Assuming 33MHz system bus speed for PIO modes; override with
idebus=xx
SIS5513: IDE controller on PCI bus 00 dev 09
SIS5513: chipset revision 7
SIS5513: not 100% native mode: will probe irqs later
SiS5511
SIS5513: simplex device: DMA disabled
ide0: SIS5513 Bus-Master DMA disabled (BIOS)
SIS5513: simplex device: DMA disabled
ide1: SIS5513 Bus-Master DMA disabled (BIOS)
hda: WDC AC36400L, ATA DISK drive
hdd: ATAPI CDROM, ATAPI CDROM drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
hda: 12594960 sectors (6449 MB) w/256KiB Cache, CHS=784/255/63
hdd: ATAPI 32X CD-ROM drive, 128kB Cache
Uniform CD-ROM driver Revision: 3.11
Partition check:
/dev/ide/host0/bus0/target0/lun0: p1 p2 p3

Output of lspci -vvv:

00:00.0 Host bridge: Silicon Integrated Systems [SiS] 5511/5512
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=slow >TAbort- <TAbort-
<MAbort+ >SERR- <PERR-
Latency: 0 set

00:01.0 ISA bridge: Silicon Integrated Systems [SiS] 85C503/5513 (rev
01)
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 0 set

00:01.1 IDE interface: Silicon Integrated Systems [SiS] 5513 [IDE] (rev
07) (prog-if 8a [Master SecP PriP])
Subsystem: Unknown device efd7:9f3c
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR-
Latency: 0 set
Interrupt: pin A routed to IRQ 0
Region 0: I/O ports at <ignored>
Region 1: I/O ports at <ignored>
Region 2: I/O ports at <ignored>
Region 3: I/O ports at <ignored>
Region 4: I/O ports at d400 [size=16]

00:0a.0 VGA compatible controller: ATI Technologies Inc 215CT [Mach64
CT] (rev 41) (prog-if 00 [VGA])
Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping+ SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Region 0: Memory at fa000000 (32-bit, non-prefetchable) [size=16M]
Expansion ROM at <unassigned> [disabled] [size=64K]

00:0b.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL-8029(AS)
Subsystem: Realtek Semiconductor Co., Ltd. RT8029(AS)
Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Interrupt: pin A routed to IRQ 11
Region 0: I/O ports at d000 [size=32]


Pavel Krcma <pavelk@post.cz>
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