Ian,
--On 3 December 2010 16:44:42 +0000 Ian Campbell
<Ian.Campbell@xxxxxxxxxxxxx> wrote:
Yes, it is "xen_emul_unplug=unnecessary" which tells the driver that you
know what you are doing and that it is not necessary to unplug the
emulated devices before enabling the pv path because you as the admin
have ensured that the pv path is safe to use.
Yes, that's what I thought.
However, that is what produces 'kernel bug' I posted earlier.
See:
Kernel command line: BOOT_IMAGE=/boot/vmlinuz-2.6.37-7-virtual
root=UUID=f7f04f87-04f3-488b-a6ae-014ce5d63850 ro
xen_emul_unplug=unnecessary console=ttyS0
For some reason, there is a call path through xenwatch_thread, then
blkfront that causes it to try and register something (I presume
the PV driver) as /dev/sda (not /dev/xvda).
--
Alex Bligh
[ 0.000000] Initializing cgroup subsys cpu
[ 0.000000] Linux version 2.6.37-7-virtual (buildd@yellow) (gcc version
4.5.2 (Ubuntu/Linaro 4.5.1-10ubuntu3) ) #19-Ubuntu SMP Wed Dec 1 02:15:20
UTC 2010 (Ubuntu 2.6.37-7.19-virtual 2.6.37-rc3)
[ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-2.6.37-7-virtual
root=UUID=f7f04f87-04f3-488b-a6ae-014ce5d63850 ro
xen_emul_unplug=unnecessary console=ttyS0
[ 0.000000] BIOS-provided physical RAM map:
[ 0.000000] BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
--
[ 0.000000] NX (Execute Disable) protection: active
[ 0.000000] DMI 2.4 present.
[ 0.000000] DMI: /HVM domU, BIOS 3.3.1 02/02/2009
[ 0.000000] Hypervisor detected: Xen HVM
[ 0.000000] Xen version 3.3.
[ 0.000000] Xen Platform PCI: unrecognised magic value
[ 0.000000] HVMOP_pagetable_dying not supported
[ 0.000000] e820 update range: 0000000000000000 - 0000000000010000
(usable) ==> (reserved)
[ 0.000000] e820 remove range: 00000000000a0000 - 0000000000100000
(usable)
--
[ 0.000000] kernel direct mapping tables up to 1fff7000 @
1fff4000-1fff7000
[ 0.000000] RAMDISK: 1f348000 - 1f799000
[ 0.000000] ACPI: RSDP 00000000000ea010 00024 (v02 Xen)
[ 0.000000] ACPI: XSDT 000000001fff8b70 00034 (v01 Xen HVM
00000000 HVML 00000000)
[ 0.000000] ACPI: FACP 000000001fff8a00 000F4 (v04 Xen HVM
00000000 HVML 00000000)
[ 0.000000] ACPI: DSDT 000000001fff7840 01132 (v02 Xen HVM
00000000 INTL 20060707)
[ 0.000000] ACPI: FACS 000000001fff7800 00040
[ 0.000000] ACPI: APIC 000000001fff8b00 00068 (v02 Xen HVM
00000000 HVML 00000000)
[ 0.000000] ACPI: Local APIC address 0xfee00000
[ 0.000000] No NUMA configuration found
--
[ 0.000000] PM: Registered nosave memory: 00000000000e0000 -
0000000000100000
[ 0.000000] Allocating PCI resources starting at 20000000 (gap:
20000000:e0000000)
[ 0.000000] Booting paravirtualized kernel on Xen
[ 0.000000] setup_percpu: NR_CPUS:64 nr_cpumask_bits:64 nr_cpu_ids:1
nr_node_ids:1
[ 0.000000] PERCPU: Embedded 28 pages/cpu @ffff88001fc00000 s83712 r8192
d22784 u2097152
--
[ 0.000000] Built 1 zonelists in Node order, mobility grouping on. Total
pages: 129152
[ 0.000000] Policy zone: DMA32
[ 0.000000] Kernel command line:
BOOT_IMAGE=/boot/vmlinuz-2.6.37-7-virtual
root=UUID=f7f04f87-04f3-488b-a6ae-014ce5d63850 ro
xen_emul_unplug=unnecessary console=ttyS0
[ 0.000000] PID hash table entries: 2048 (order: 2, 16384 bytes)
[ 0.000000] Checking aperture...
--
[ 0.821839] Fixed MDIO Bus: probed
[ 0.823360] PPP generic driver version 2.4.2
[ 0.825496] Initialising Xen virtual ethernet driver.
[ 0.827998] tun: Universal TUN/TAP device driver, 1.6
[ 0.830247] tun: (C) 1999-2004 Max Krasnyansky <maxk@xxxxxxxxxxxx>
--
[ 2.791086] xen-platform-pci 0000:00:03.0: PCI INT A -> GSI 28 (level,
low) -> IRQ 28
[ 2.798695] Grant table initialized
[ 2.889459] blkfront device/vbd/51712 num-ring-pages 1 nr_ents 32.
[ 2.897163] blkfront: sda: barriers disabled
[ 2.900483] ------------[ cut here ]------------
[ 2.900608] WARNING: at /build/buildd/linux-2.6.37/fs/sysfs/dir.c:451
sysfs_add_one+0xd8/0x150()
[ 2.900616] Hardware name: HVM domU
[ 2.900618] sysfs: cannot create duplicate filename '/class/block/sda'
[ 2.900619] Modules linked in: platform_pci acpiphp floppy 8139too 8139cp
[ 2.900656] Pid: 10, comm: xenwatch Not tainted 2.6.37-7-virtual
#19-Ubuntu
[ 2.900659] Call Trace:
[ 2.900668] [<ffffffff8106623f>] warn_slowpath_common+0x7f/0xc0
[ 2.900671] [<ffffffff81066336>] warn_slowpath_fmt+0x46/0x50
[ 2.900674] [<ffffffff811d4608>] sysfs_add_one+0xd8/0x150
[ 2.900677] [<ffffffff811d4fbb>] sysfs_do_create_link+0x12b/0x210
[ 2.900680] [<ffffffff811d50b3>] sysfs_create_link+0x13/0x20
[ 2.900717] [<ffffffff813ab923>] device_add_class_symlinks+0xb3/0xd0
[ 2.900721] [<ffffffff813acd98>] device_add+0x248/0x410
[ 2.900725] [<ffffffff811cb2b1>] register_disk+0x41/0x170
[ 2.900748] [<ffffffff812cbf26>] add_disk+0xa6/0x160
[ 2.900753] [<ffffffff813c9a60>] blkfront_connect+0x120/0x1e0
[ 2.900756] [<ffffffff813c9b60>] blkback_changed+0x40/0x50
[ 2.900761] [<ffffffff8136d420>] otherend_changed+0xb0/0xc0
[ 2.900763] [<ffffffff8136b9b6>] xenwatch_thread+0xb6/0x170
[ 2.900768] [<ffffffff81087da0>] ? autoremove_wake_function+0x0/0x40
[ 2.900771] [<ffffffff8136b900>] ? xenwatch_thread+0x0/0x170
[ 2.900773] [<ffffffff81087676>] kthread+0x96/0xa0
[ 2.900777] [<ffffffff8100cee4>] kernel_thread_helper+0x4/0x10
[ 2.900780] [<ffffffff810875e0>] ? kthread+0x0/0xa0
[ 2.900783] [<ffffffff8100cee0>] ? kernel_thread_helper+0x0/0x10
[ 2.900785] ---[ end trace d4f9aa3628762311 ]---
[ 2.900811] ------------[ cut here ]------------
[ 2.902999] kernel BUG at /build/buildd/linux-2.6.37/fs/sysfs/group.c:65!
[ 2.906099] invalid opcode: 0000 [#1] SMP
[ 2.908061] last sysfs file: /sys/devices/pci0000:00/0000:00:03.0/uevent
[ 2.910028] CPU 0
[ 2.910028] Modules linked in: platform_pci acpiphp floppy 8139too 8139cp
[ 2.910028]
[ 2.910028] Pid: 10, comm: xenwatch Tainted: G W 2.6.37-7-virtual
#19-Ubuntu /HVM domU
[ 2.910028] RIP: 0010:[<ffffffff811d64b7>] [<ffffffff811d64b7>]
internal_create_group+0x187/0x1a0
[ 2.910028] RSP: 0018:ffff88001f9b3ce0 EFLAGS: 00010246
[ 2.910028] RAX: 00000000ffffffef RBX: ffff88001c4f3800 RCX:
ffff88001cf70900
[ 2.910028] RDX: ffffffff81a1faa0 RSI: 0000000000000000 RDI:
ffff88001c4f3870
[ 2.910028] RBP: ffff88001f9b3d30 R08: 000000000000000d R09:
000000000000000b
[ 2.910028] R10: 0000000000000000 R11: 0000000000000000 R12:
ffff88001c6368e0
[ 2.910028] R13: ffff88001c4f3860 R14: ffffffff81a1faa0 R15:
0000000000000000
[ 2.910028] FS: 00007f1c2c9e4700(0000) GS:ffff88001fc00000(0000)
knlGS:0000000000000000
[ 2.910028] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 2.910028] CR2: 00007fe87eb2c1d8 CR3: 000000001cd33000 CR4:
00000000000006f0
[ 2.910028] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[ 2.910028] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
0000000000000400
[ 2.910028] Process xenwatch (pid: 10, threadinfo ffff88001f9b2000, task
ffff88001f9a5b00)
[ 2.910028] Stack:
[ 2.910028] ffff88001f9b3d40 ffff88001c4f3870 000000303a323032
ffff88001f9b3d50
[ 2.910028] ffff88001f9b3d10 ffff88001c4f3800 ffff88001c6368e0
ffff88001c4f3860
[ 2.910028] ffff88001dfc1de0 ffff88001c4f3800 ffff88001f9b3d40
ffffffff811d6503
[ 2.910028] Call Trace:
[ 2.910028] [<ffffffff811d6503>] sysfs_create_group+0x13/0x20
[ 2.910028] [<ffffffff810f7174>] blk_trace_init_sysfs+0x14/0x20
[ 2.910028] [<ffffffff812c5fa0>] blk_register_queue+0x40/0x110
[ 2.910028] [<ffffffff812cbf2e>] add_disk+0xae/0x160
[ 2.910028] [<ffffffff813c9a60>] blkfront_connect+0x120/0x1e0
[ 2.910028] [<ffffffff813c9b60>] blkback_changed+0x40/0x50
[ 2.910028] [<ffffffff8136d420>] otherend_changed+0xb0/0xc0
[ 2.910028] [<ffffffff8136b9b6>] xenwatch_thread+0xb6/0x170
[ 2.910028] [<ffffffff81087da0>] ? autoremove_wake_function+0x0/0x40
[ 2.910028] [<ffffffff8136b900>] ? xenwatch_thread+0x0/0x170
[ 2.910028] [<ffffffff81087676>] kthread+0x96/0xa0
[ 2.910028] [<ffffffff8100cee4>] kernel_thread_helper+0x4/0x10
[ 2.910028] [<ffffffff810875e0>] ? kthread+0x0/0xa0
[ 2.910028] [<ffffffff8100cee0>] ? kernel_thread_helper+0x0/0x10
[ 2.910028] Code: 8b 45 b0 74 15 48 8b 7d c8 89 45 b0 e8 93 e3 ff ff 4c
8b 6d c8 8b 45 b0 eb 90 4c 8b 6d c8 eb 8a 48 83 7f 30 00 0f 85 be fe ff ff
<0f> 0b be b7 00 00 00 48 c7 c7 58 79 7d 81 e8 b6 fd e8 ff e9 dc
[ 2.910028] RIP [<ffffffff811d64b7>] internal_create_group+0x187/0x1a0
[ 2.910028] RSP <ffff88001f9b3ce0>
[ 2.928247] ---[ end trace d4f9aa3628762312 ]---
[ 3.836521] eth0: link up, 100Mbps, full-duplex, lpa 0x05E1
[ 4.142405] parport_pc 00:0a: reported by Plug and Play ACPI
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