linux-kernel - 2.6.27-rc xen pvops regression?

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Message-ID: <20080831171848.GA11653@pest>
Date:	Sun, 31 Aug 2008 19:18:49 +0200
From:	Bernhard Schmidt <berni@...kenwald.de>
To:	linux-kernel@...r.kernel.org
Subject: 2.6.27-rc xen pvops regression?

Hello,

I've been a happy user of vanilla 2.6.26 with pvops in my Xen domU for
a couple of months. I wanted to test 2.6.27-rc (-rc3 a couple of weeks
ago, -rc5 just now) to verify another issue and ran into the following
error

Using config file "/etc/xen/miredo2.cfg".
Started domain miredo2
    0: 0x00000395 -> 0x00010000
Using APIC driver default
Could not enable APIC!
Allocating PCI resources starting at 20000000 (gap: 10000000:f0000000)
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 64861
Kernel command line: root=/dev/xvda1 ro 3 console=xvc0 lapic
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Initializing CPU#0
PID hash table entries: 1024 (order: 10, 4096 bytes)
Detected 2800.098 MHz processor.
Console: colour dummy device 80x25
console [tty0] enabled
console [hvc0] enabled
Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
Memory: 256164k/262144k available (1270k kernel code, 5152k reserved, 496k data, 156k init, 0k highmem)
virtual kernel memory layout:
    fixmap  : 0xf57a9000 - 0xf57fd000   ( 336 kB)
    pkmap   : 0xf5200000 - 0xf5400000   (2048 kB)
    vmalloc : 0xd0800000 - 0xf51fe000   ( 585 MB)
    lowmem  : 0xc0000000 - 0xd0000000   ( 256 MB)
      .init : 0xc02bc000 - 0xc02e3000   ( 156 kB)
      .data : 0xc023dbba - 0xc02b9fa0   ( 496 kB)
      .text : 0xc0100000 - 0xc023dbba   (1270 kB)
Checking if this processor honours the WP bit even in supervisor mode...Ok.
SLUB: Genslabs=12, HWalign=128, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
installing Xen timer for CPU 0
Calibrating delay loop (skipped), value calculated using timer frequency.. 5600.19 BogoMIPS (lpj=11200392)
Mount-cache hash table entries: 512
CPU: Trace cache: 12K uops, L1 D cache: 16K
CPU: L2 cache: 1024K
CPU: Intel(R) Pentium(R) 4 CPU 2.80GHz stepping 04
Freeing SMP alternatives: 0k freed
initcall spawn_ksoftirqd+0x0/0x30 returned with disabled interrupts
initcall spawn_softlockup_task+0x0/0x48 returned with disabled interrupts
initcall relay_init+0x0/0x3 returned with disabled interrupts
net_namespace: 488 bytes
initcall net_ns_init+0x0/0x106 returned with disabled interrupts
initcall reboot_init+0x0/0xd returned with disabled interrupts
Booting paravirtualized kernel on Xen
Xen version: 3.2.1-rc1-pre
initcall print_banner+0x0/0x9 returned with disabled interrupts
initcall sysctl_init+0x0/0x24 returned with disabled interrupts
initcall ksysfs_init+0x0/0x92 returned with disabled interrupts
initcall init_jiffies_clocksource+0x0/0xa returned with disabled interrupts
initcall filelock_init+0x0/0x25 returned with disabled interrupts
initcall init_script_binfmt+0x0/0xa returned with disabled interrupts
initcall init_elf_binfmt+0x0/0xa returned with disabled interrupts
initcall random32_init+0x0/0x81 returned with disabled interrupts
Grant table initialized
initcall gnttab_init+0x0/0x168 returned with disabled interrupts
initcall sock_init+0x0/0x4a returned with disabled interrupts
NET: Registered protocol family 16
initcall netlink_proto_init+0x0/0xf8 returned with disabled interrupts
nitcall bdi_class_init+0x0/0x20 returned with disabled interrupts
initcall kobject_uevent_init+0x0/0x3b returned with disabled interrupts

and freeze. The base system is Ubuntu hardy on i386, Xen 3.2.1-rc1 as 
packaged.

Please find my .config attached. Basically the very same .config ran fine
with 2.6.26 (I copied it over and ran "make oldconfig").

Bernhard

View attachment "config-2.6.27-rc5-pvops" of type "text/plain" (20866 bytes)