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SubjectRe: Checkin 7404ad3b6d04efbd918e9e2e776bf560fbedf47d breaks boot on KVM
James Bottomley wrote:
>>
> Actually, it is surprising. That patch takes the default arithmetic for
> calculating the disk size out of sd and uses a routine to do it more
> efficiently in lib/string_helpers.c
>
> So there are two problems: Why does it panic on revert (could you post
> the oops) and what does kvm object to in string_get_size ... it's a
> fairly innocuous routine as I read it ... your symptoms sound like the
> for loop isn't terminating.
>

Here is the oops. Note that it does get well past the hang point before
it crashes. It is 100% reproducible.

console [netcon0] enabled

netconsole: network logging started

Uniform Multi-Platform E-IDE driver

ide-floppy driver 1.00

Driver 'sd' needs updating - please use bus_type methods

scsi0 : ata_piix

scsi1 : ata_piix

ata1: PATA max MWDMA2 cmd 0x1f0 ctl 0x3f6 bmdma 0xc000 irq 14

ata2: PATA max MWDMA2 cmd 0x170 ctl 0x376 bmdma 0xc008 irq 15

ata1.00: ATA-7: QEMU HARDDISK, 0.9.1, max UDMA/100

ata1.00: 16777216 sectors, multi 16: LBA48

ata1.00: configured for MWDMA2

ata2.00: ATAPI: QEMU DVD-ROM, 0.9.1, max UDMA/100

ata2.00: configured for MWDMA2

scsi 0:0:0:0: Direct-Access ATA QEMU HARDDISK 0.9. PQ: 0
ANSI: 5
sd 0:0:0:0: [sda] 16777216 512-byte hardware sectors (8590 MB)

sd 0:0:0:0: [sda] Write Protect is off

sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't
support DPO or FUA
sd 0:0:0:0: [sda] 16777216 512-byte hardware sectors (8590 MB)

sd 0:0:0:0: [sda] Write Protect is off

sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't
support DPO or FUA
sda: sda1

sd 0:0:0:0: [sda] Attached SCSI disk

scsi 1:0:0:0: CD-ROM QEMU QEMU DVD-ROM 0.9. PQ: 0
ANSI: 5
PNP: PS/2 Controller [PNP0303:KBD,PNP0f13:MOU] at 0x60,0x64 irq 1,12

serio: i8042 KBD port at 0x60,0x64 irq 1

serio: i8042 AUX port at 0x60,0x64 irq 12

mice: PS/2 mouse device common for all mice

input: AT Translated Set 2 keyboard as /class/input/input0

md: linear personality registered for level -1

md: raid0 personality registered for level 0

md: raid1 personality registered for level 1

md: raid10 personality registered for level 10

raid6: int32x1 972 MB/s

raid6: int32x2 1032 MB/s

raid6: int32x4 763 MB/s
raid6: int32x8 729 MB/s
raid6: mmxx1 2572 MB/s
raid6: mmxx2 3154 MB/s
raid6: sse1x1 2036 MB/s
raid6: sse1x2 2430 MB/s
raid6: sse2x1 3506 MB/s
raid6: sse2x2 3428 MB/s
raid6: using algorithm sse2x1 (3506 MB/s)
md: raid6 personality registered for level 6
md: raid5 personality registered for level 5
md: raid4 personality registered for level 4
EDAC MC: Ver: 2.1.0 Oct 13 2008
input: ImExPS/2 Generic Explorer Mouse as /class/input/input1
dcdbas dcdbas: Dell Systems Management Base Driver (version 5.6.0-3.2)
usbcore: registered new interface driver hiddev
usbcore: registered new interface driver usbhid
usbhid: v2.6:USB HID core driver
TCP cubic registered
NET: Registered protocol family 17
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
Using IPI Shortcut mode
registered taskstats version 1
BIOS EDD facility v0.16 2004-Jun-25, 1 devices found
md: Autodetecting RAID arrays.
md: Scanned 0 and added 0 devices.
md: autorun ...
md: ... autorun DONE.
kjournald starting. Commit interval 5 seconds
EXT3-fs: mounted filesystem with ordered data mode.
VFS: Mounted root (ext3 filesystem) readonly.
Freeing unused kernel memory: 304k freed
Write protecting the kernel text: 3692k
Write protecting the kernel read-only data: 1556k
BUG: spinlock bad magic on CPU#0, swapper/1
lock: c0b75418, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0
Pid: 1, comm: swapper Not tainted 2.6.27 #17
Call Trace:
[<c0597388>] ? printk+0xf/0x17
[<c03ac8ae>] spin_bug+0x75/0x80
[<c03ac97c>] _raw_spin_lock+0x1e/0xe4
[<c0412a3f>] ? serial8250_startup+0x33e/0x4e5
[<c0599821>] _spin_lock_irq+0x32/0x3a
[<c0412a3f>] ? serial8250_startup+0x33e/0x4e5
[<c0412a3f>] serial8250_startup+0x33e/0x4e5
[<c040f5fb>] uart_startup+0x84/0x143
[<c0410309>] uart_open+0x14b/0x381
[<c05996ba>] ? _spin_unlock+0x27/0x3c
[<c03f483f>] ? check_tty_count+0x3b/0x8a
[<c03f70b9>] tty_open+0x263/0x366
[<c0271b2a>] chrdev_open+0x168/0x180
[<c026df19>] __dentry_open+0x146/0x234
[<c026e08e>] nameidata_to_filp+0x1f/0x33
[<c02719c2>] ? chrdev_open+0x0/0x180
[<c0278ed1>] do_filp_open+0x342/0x659
[<c023651c>] ? trace_hardirqs_off+0xb/0xd
[<c05996ba>] ? _spin_unlock+0x27/0x3c
[<c026dcff>] do_sys_open+0x42/0xb7
[<c026ddb6>] sys_open+0x1e/0x26
[<c0201216>] init_post+0x2a/0x13c
[<c0203d53>] ? kernel_thread_helper+0x7/0x10


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