Re: IDE poweroff -> hangup

[Andre Hedrick]

Balazs....

OH the fun....what do you think you are doing?
Since you have not issued a power down command nor deregisterd the device,
because I have not publish hotswap-ata yet....thus you can not do this in
a pretty way.....<ata> grumbles for Bryce.....
You are lucky that you have to burned the mainboard.
The open-collector pull on the channel will destroy the buffers on the
device.  By pulling the power you can not hold the state of the latches
derived from the power-ground lines.

There is no kernel bug!

Does it not occur to you that by dropping the power on the device you
cause it to revert to the default values from POST?
You have successfully unsynced the HOST and the DEVICE as the timings for
the transfer rates.  So it should HANG and DIE!

Just be glad that the kernel will crash and not eat your data.

Regards,

Andre Hedrick
Linux ATA Development

On Thu, 15 Mar 2001, Pozsar Balazs wrote:

> 
> Hi all,
> 
> I was courious, and I tried what happens if I power down my harddisk (ie
> manually pull the power plug out), and then power it on again after a few
> secs (put the plug back).
> 
> I do not know if the system should survive happily such an 'accident', but
> it hadn't:
> A few secs after the next access to the disc, I got the following on the
> console:
> hdg: timeout waiting for DMA
> ide_dmaproc: chipset supported ide_dma_timeout func only: 14
> and the machine froze the hard way (no respond to sysrq).
> 
> Tell me if this shouldn't be honoured by the kernel, but if there's a bug
> around, here's some info:
> 
> Linux version 2.4.2 ([e-mail]) (gcc version 2.95.3 19991030 (prerelease)) #1 SMP Wed Mar 7 22:58:36 CET 2001
> BIOS-provided physical RAM map:
>  BIOS-e820: 000000000009fc00 @ 0000000000000000 (usable)
>  BIOS-e820: 0000000000000400 @ 000000000009fc00 (reserved)
>  BIOS-e820: 0000000000010000 @ 00000000000f0000 (reserved)
>  BIOS-e820: 0000000000001000 @ 00000000fec00000 (reserved)
>  BIOS-e820: 0000000000001000 @ 00000000fee00000 (reserved)
>  BIOS-e820: 0000000000010000 @ 00000000ffff0000 (reserved)
>  BIOS-e820: 0000000017ef0000 @ 0000000000100000 (usable)
>  BIOS-e820: 000000000000d000 @ 0000000017ff3000 (ACPI data)
>  BIOS-e820: 0000000000003000 @ 0000000017ff0000 (ACPI NVS)
> Scan SMP from c0000000 for 1024 bytes.
> Scan SMP from c009fc00 for 1024 bytes.
> Scan SMP from c00f0000 for 65536 bytes.
> found SMP MP-table at 000f5770
> hm, page 000f5000 reserved twice.
> hm, page 000f6000 reserved twice.
> hm, page 000f1000 reserved twice.
> hm, page 000f2000 reserved twice.
> On node 0 totalpages: 98288
> zone(0): 4096 pages.
> zone(1): 94192 pages.
> zone(2): 0 pages.
> Intel MultiProcessor Specification v1.1
>     Virtual Wire compatibility mode.
> OEM ID: OEM00000 Product ID: PROD00000000 APIC at: 0xFEE00000
> Processor #0 Pentium(tm) Pro APIC version 17
>     Floating point unit present.
>     Machine Exception supported.
>     64 bit compare & exchange supported.
>     Internal APIC present.
>     SEP present.
>     MTRR  present.
>     PGE  present.
>     MCA  present.
>     CMOV  present.
>     Bootup CPU
> Bus #0 is PCI
> Bus #1 is PCI
> Bus #2 is ISA
> I/O APIC #2 Version 17 at 0xFEC00000.
> Int: type 3, pol 0, trig 0, bus 2, IRQ 00, APIC ID 2, APIC INT 00
> Int: type 0, pol 0, trig 0, bus 2, IRQ 01, APIC ID 2, APIC INT 01
> Int: type 0, pol 0, trig 0, bus 2, IRQ 00, APIC ID 2, APIC INT 02
> Int: type 0, pol 0, trig 0, bus 2, IRQ 03, APIC ID 2, APIC INT 03
> Int: type 0, pol 0, trig 0, bus 2, IRQ 04, APIC ID 2, APIC INT 04
> Int: type 0, pol 0, trig 0, bus 2, IRQ 06, APIC ID 2, APIC INT 06
> Int: type 0, pol 0, trig 0, bus 2, IRQ 07, APIC ID 2, APIC INT 07
> Int: type 0, pol 1, trig 1, bus 2, IRQ 08, APIC ID 2, APIC INT 08
> Int: type 0, pol 0, trig 0, bus 2, IRQ 0c, APIC ID 2, APIC INT 0c
> Int: type 0, pol 0, trig 0, bus 2, IRQ 0d, APIC ID 2, APIC INT 0d
> Int: type 0, pol 0, trig 0, bus 2, IRQ 0e, APIC ID 2, APIC INT 0e
> Int: type 0, pol 0, trig 0, bus 2, IRQ 0f, APIC ID 2, APIC INT 0f
> Int: type 0, pol 3, trig 3, bus 2, IRQ 09, APIC ID 2, APIC INT 09
> Int: type 0, pol 3, trig 3, bus 2, IRQ 05, APIC ID 2, APIC INT 05
> Int: type 0, pol 3, trig 3, bus 2, IRQ 0b, APIC ID 2, APIC INT 0b
> Int: type 0, pol 3, trig 3, bus 2, IRQ 0a, APIC ID 2, APIC INT 0a
> Lint: type 3, pol 0, trig 0, bus 2, IRQ 00, APIC ID ff, APIC LINT 00
> Lint: type 1, pol 0, trig 0, bus 2, IRQ 00, APIC ID ff, APIC LINT 01
> Processors: 1
> mapped APIC to ffffe000 (fee00000)
> mapped IOAPIC to ffffd000 (fec00000)
> Kernel command line: root=/dev/hdg4 apm=power-off noapic mem=393152K
> Initializing CPU#0
> Detected 434.815 MHz processor.
> Console: colour VGA+ 80x25
> Calibrating delay loop... 865.07 BogoMIPS
> Memory: 384580k/393152k available (856k kernel code, 8184k reserved, 294k data, 184k init, 0k highmem)
> Dentry-cache hash table entries: 65536 (order: 7, 524288 bytes)
> Buffer-cache hash table entries: 32768 (order: 5, 131072 bytes)
> Page-cache hash table entries: 131072 (order: 7, 524288 bytes)
> Inode-cache hash table entries: 32768 (order: 6, 262144 bytes)
> CPU: Before vendor init, caps: 0183fbff 00000000 00000000, vendor = 0
> CPU: L1 I cache: 16K, L1 D cache: 16K
> CPU: L2 cache: 128K
> Intel machine check architecture supported.
> Intel machine check reporting enabled on CPU#0.
> CPU: After vendor init, caps: 0183fbff 00000000 00000000 00000000
> CPU: After generic, caps: 0183fbff 00000000 00000000 00000000
> CPU: Common caps: 0183fbff 00000000 00000000 00000000
> Enabling fast FPU save and restore... done.
> Checking 'hlt' instruction... OK.
> POSIX conformance testing by UNIFIX
> mtrr: v1.37 (20001109) Richard Gooch ([e-mail])
> mtrr: detected mtrr type: Intel
> CPU: Before vendor init, caps: 0183fbff 00000000 00000000, vendor = 0
> CPU: L1 I cache: 16K, L1 D cache: 16K
> CPU: L2 cache: 128K
> Intel machine check reporting enabled on CPU#0.
> CPU: After vendor init, caps: 0183fbff 00000000 00000000 00000000
> CPU: After generic, caps: 0183fbff 00000000 00000000 00000000
> CPU: Common caps: 0183fbff 00000000 00000000 00000000
> CPU0: Intel Celeron (Mendocino) stepping 05
> per-CPU timeslice cutoff: 365.86 usecs.
> Getting VERSION: 40011
> Getting VERSION: 40011
> Getting ID: 0
> Getting ID: f000000
> Getting LVT0: 700
> Getting LVT1: 400
> enabled ExtINT on CPU#0
> ESR value before enabling vector: 00000004
> ESR value after enabling vector: 00000000
> CPU present map: 1
> Before bogomips.
> Error: only one processor found.
> Boot done.
> calibrating APIC timer ...
> ..... CPU clock speed is 434.8114 MHz.
> ..... host bus clock speed is 66.8940 MHz.
> cpu: 0, clocks: 668940, slice: 334470
> CPU0<T0:668928,T1:334448,D:10,S:334470,C:668940>
> Setting commenced=1, go go go
> PCI: PCI BIOS revision 2.10 entry at 0xfb3a0, last bus=1
> PCI: Using configuration type 1
> PCI: Probing PCI hardware
> Unknown bridge resource 0: assuming transparent
> PCI: Using IRQ router VIA [1106/0686] at 00:07.0
> Linux NET4.0 for Linux 2.4
> Based upon Swansea University Computer Society NET3.039
> apm: BIOS version 1.2 Flags 0x07 (Driver version 1.14)
> Starting kswapd v1.8
> pty: 256 Unix98 ptys configured
> block: queued sectors max/low 255296kB/124224kB, 768 slots per queue
> Uniform Multi-Platform E-IDE driver Revision: 6.31
> ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
> VP_IDE: IDE controller on PCI bus 00 dev 39
> VP_IDE: chipset revision 6
> VP_IDE: not 100% native mode: will probe irqs later
>     ide0: BM-DMA at 0xc000-0xc007, BIOS settings: hda:pio, hdb:pio
>     ide1: BM-DMA at 0xc008-0xc00f, BIOS settings: hdc:pio, hdd:pio
> HPT370: IDE controller on PCI bus 00 dev 70
> PCI: Found IRQ 11 for device 00:0e.0
> PCI: The same IRQ used for device 00:0d.0
> HPT370: chipset revision 3
> HPT370: not 100% native mode: will probe irqs later
>     ide2: BM-DMA at 0xec00-0xec07, BIOS settings: hde:pio, hdf:pio
>     ide3: BM-DMA at 0xec08-0xec0f, BIOS settings: hdg:DMA, hdh:pio
> hdf: YAMAHA CRW2100E, ATAPI CD/DVD-ROM drive
> hdg: QUANTUM FIREBALLlct20 20, ATA DISK drive
> ide2 at 0xdc00-0xdc07,0xe002 on irq 11
> ide3 at 0xe400-0xe407,0xe802 on irq 11
> hdg: 39876480 sectors (20417 MB) w/418KiB Cache, CHS=39560/16/63, UDMA(100)
> Partition check:
>  /dev/ide/host2/bus1/target0/lun0: p1 p2 p3 p4
> NET4: Linux TCP/IP 1.0 for NET4.0
> IP Protocols: ICMP, UDP, TCP, IGMP
> IP: routing cache hash table of 4096 buckets, 32Kbytes
> TCP: Hash tables configured (established 32768 bind 32768)
> devfs: v0.102 (20000622) Richard Gooch ([e-mail])
> devfs: boot_options: 0x0
> VFS: Mounted root (ext2 filesystem) readonly.
> Mounted devfs on /dev
> Freeing unused kernel memory: 184k freed
> NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
> SCSI subsystem driver Revision: 1.00
> hdf: ATAPI 40X CD-ROM CD-R/RW drive, 8192kB Cache
> Uniform CD-ROM driver Revision: 3.12
> ...
> 
> regards,
> Balazs Pozsar.
> 
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to [e-mail]
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
>