Messages in this thread | | | Date | Tue, 14 Oct 2008 09:00:55 -0700 | From | "H. Peter Anvin" <> | Subject | Re: Checkin 7404ad3b6d04efbd918e9e2e776bf560fbedf47d breaks boot on KVM |
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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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