I have an IBM System x 3250 that successfully boots using the standard kernel (2.6.18-8.1.10.el5) but fails to boot with the xen kernel. The kernel appears to fail when it attempts to initialize the driver for the onboard SAS controller (LSI Logic / Symbios Logic SAS1064E PCI-Express Fusion-MPT SAS). Can anyone provide any advice? Here's the relevant info. Please let me know if any other information would be helpful.

IBM System x 3250: dual-core Pentium D 3GHz, 3GB memory

[root@xenhost2 ~]# lspci 00:00.0 Host bridge: Intel Corporation E7230/3000/3010 Memory Controller Hub (rev c0) 00:01.0 PCI bridge: Intel Corporation E7230/3000/3010 PCI Express Root Port (rev c0) 00:03.0 PCI bridge: Intel Corporation 82975X/3010 PCI Express Root Port (rev c0) 00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 1 (rev 01) 00:1c.4 PCI bridge: Intel Corporation 82801GR/GH/GHM (ICH7 Family) PCI Express Port 5 (rev 01) 00:1c.5 PCI bridge: Intel Corporation 82801GR/GH/GHM (ICH7 Family) PCI Express Port 6 (rev 01) 00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #1 (rev 01) 00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #2 (rev 01) 00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #3 (rev 01) 00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #4 (rev 01) 00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller (rev 01) 00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev e1) 00:1f.0 ISA bridge: Intel Corporation 82801GB/GR (ICH7 Family) LPC Interface Bridge (rev 01) 00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE Controller (rev 01) 00:1f.3 SMBus: Intel Corporation 82801G (ICH7 Family) SMBus Controller (rev 01) 01:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5721 Gigabit Ethernet PCI Express (rev 21) 03:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5721 Gigabit Ethernet PCI Express (rev 21) 05:00.0 SCSI storage controller: LSI Logic / Symbios Logic SAS1064E PCI-Express Fusion-MPT SAS (rev 02) 1a:04.0 VGA compatible controller: ATI Technologies Inc ES1000 (rev 02)

[root@xenhost2 ~]# rpm -qa | grep xen kernel-xen-devel-2.6.18-8.1.14.el5 xen-libs-3.0.3-25.0.3.el5 kernel-xen-2.6.18-8.1.14.el5 xen-3.0.3-25.0.3.el5 xen-devel-3.0.3-25.0.3.el5

kernel output (via serial console): Xen version 3.0.3-rc5-8.1.14.el5 (mockbuild@) (gcc version 4.1.1 20070105 (Red Hat 4.1.1-52)) Thu Sep 27 18:50:52 EDT 27 Latest ChangeSet: unavailable

(XEN) Command line: /xen.gz-2.6.18-8.1.14.el5com1=38400,8n1 (XEN) Physical RAM map: (XEN) 0000000000000000 - 000000000009e800 (usable) (XEN) 000000000009e800 - 00000000000a0000 (reserved) (XEN) 00000000000d6000 - 00000000000d8000 (reserved) (XEN) 00000000000e0000 - 0000000000100000 (reserved) (XEN) 0000000000100000 - 00000000bfed0000 (usable) (XEN) 00000000bfed0000 - 00000000bfee1000 (ACPI data) (XEN) 00000000bfee1000 - 00000000bff00000 (ACPI NVS) (XEN) 00000000bff00000 - 00000000c0000000 (reserved) (XEN) 00000000fec00000 - 00000000fec10000 (reserved) (XEN) 00000000fee00000 - 00000000fee01000 (reserved) (XEN) 00000000ff000000 - 0000000100000000 (reserved) (XEN) System RAM: 3070MB (3144120kB) (XEN) Xen heap: 14MB (14356kB) (XEN) found SMP MP-table at 000f68e0 (XEN) DMI present. (XEN) Using APIC driver default (XEN) ACPI: RSDP (v000 PTLTD ) @ 0x00000000000f68b0 (XEN) ACPI: RSDT (v001 PTLTD RSDT 0x06040000 LTP 0x00000000) @ 0x00000000bfed9b7a (XEN) ACPI: FADT (v001 INTEL 0x06040000 PTL 0x00000003) @ 0x00000000bfee0e70 (XEN) ACPI: MCFG (v001 PTLTD MCFG 0x06040000 LTP 0x00000000) @ 0x00000000bfee0ee4 (XEN) ACPI: MADT (v001 PTLTD APIC 0x06040000 LTP 0x00000000) @ 0x00000000bfee0f20 (XEN) ACPI: BOOT (v001 PTLTD $SBFTBL$ 0x06040000 LTP 0x00000001) @ 0x00000000bfee0f88 (XEN) ACPI: SPCR (v001 PTLTD $UCRTBL$ 0x06040000 PTL 0x00000001) @ 0x00000000bfee0fb0 (XEN) ACPI: SSDT (v001 PmRef CpuPm 0x00003000 INTL 0x20050228) @ 0x00000000bfed9bb6 (XEN) ACPI: DSDT (v001 INTEL GLENWOOD 0x06040000 MSFT 0x0100000e) @ 0x0000000000000000 (XEN) ACPI: Local APIC address 0xfee00000 (XEN) ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled) (XEN) Processor #0 15:6 APIC version 20 (XEN) ACPI: LAPIC (acpi_id[0x01] lapic_id[0x01] enabled) (XEN) Processor #1 15:6 APIC version 20 (XEN) ACPI: LAPIC_NMI (acpi_id[0x00] high edge lint[0x1]) (XEN) ACPI: LAPIC_NMI (acpi_id[0x01] high edge lint[0x1]) (XEN) ACPI: IOAPIC (id[0x02] address[0xfec00000] gsi_base[0]) (XEN) IOAPIC[0]: apic_id 2, version 32, address 0xfec00000, GSI 0-23 (XEN) ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 high edge) (XEN) ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level) (XEN) ACPI: IRQ0 used by override. (XEN) ACPI: IRQ2 used by override. (XEN) ACPI: IRQ9 used by override. (XEN) Enabling APIC mode: Flat. Using 1 I/O APICs (XEN) Using ACPI (MADT) for SMP configuration information (XEN) Using scheduler: SMP Credit Scheduler (credit) (XEN) Initializing CPU#0 (XEN) Detected 3000.299 MHz processor. (XEN) CPU: Trace cache: 12K uops, L1 D cache: 16K (XEN) CPU: L2 cache: 2048K (XEN) CPU: Physical Processor ID: 0 (XEN) CPU: Processor Core ID: 0 (XEN) Intel machine check architecture supported. (XEN) Intel machine check reporting enabled on CPU#0. (XEN) CPU0: Intel P4/Xeon Extended MCE MSRs (24) available (XEN) CPU0: Thermal monitoring handled by SMI (XEN) CPU0: Intel(R) Pentium(R) D CPU 3.00GHz stepping 05 (XEN) Booting processor 1/1 eip 90000 (XEN) Initializing CPU#1 (XEN) CPU: Trace cache: 12K uops, L1 D cache: 16K (XEN) CPU: L2 cache: 2048K (XEN) CPU: Physical Processor ID: 0 (XEN) CPU: Processor Core ID: 1 (XEN) Intel machine check architecture supported. (XEN) Intel machine check reporting enabled on CPU#1. (XEN) CPU1: Intel P4/Xeon Extended MCE MSRs (24) available (XEN) CPU1: Thermal monitoring enabled (XEN) CPU1: Intel(R) Pentium(R) D CPU 3.00GHz stepping 05 (XEN) Total of 2 processors activated. (XEN) ENABLING IO-APIC IRQs (XEN) -> Using new ACK method (XEN) ..TIMER: vector=0xF0 apic1=0 pin1=2 apic2=-1 pin2=-1 (XEN) checking TSC synchronization across 2 CPUs: passed. (XEN) Platform timer is 1.193MHz PIT (XEN) Brought up 2 CPUs (XEN) Machine check exception polling timer started. (XEN) *** LOADING DOMAIN 0 *** (XEN) Domain 0 kernel supports features = { 0000001f }. (XEN) Domain 0 kernel requires features = { 00000000 }. (XEN) PHYSICAL MEMORY ARRANGEMENT: (XEN) Dom0 alloc.: 0000000002000000->0000000004000000 (731834 pages to be allocated) (XEN) VIRTUAL MEMORY ARRANGEMENT: (XEN) Loaded kernel: ffffffff80200000->ffffffff806cc804 (XEN) Init. ramdisk: ffffffff806cd000->ffffffff80c9c600 (XEN) Phys-Mach map: ffffffff80c9d000->ffffffff812425d0 (XEN) Start info: ffffffff81243000->ffffffff8124349c (XEN) Page tables: ffffffff81244000->ffffffff81251000 (XEN) Boot stack: ffffffff81251000->ffffffff81252000 (XEN) TOTAL: ffffffff80000000->ffffffff81400000 (XEN) ENTRY ADDRESS: ffffffff80200000 (XEN) Dom0 has maximum 2 VCPUs (XEN) Initrd len 0x5cf600, start at 0xffffffff806cd000 (XEN) Scrubbing Free RAM: ...............................done. (XEN) Xen trace buffers: disabled (XEN) Xen is relinquishing VGA console. (XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch input to Xen). kernel direct mapping tables up to b52ba000 @ 1254000-1db0000 Bootdata ok (command line is ro root=/dev/VolGroup01/LogVol00 noapic acpi=off console=tty console=ttyS0 console=xvc xenc) Linux version 2.6.18-8.1.14.el5xen (mockbuild@builder6.centos.org) (gcc version 4.1.1 20070105 (Red Hat 4.1.1-52)) #1 SM7 BIOS-provided physical RAM map: Xen: 0000000000000000 - 00000000b52ba000 (usable) DMI present. Intel MultiProcessor Specification v1.4 Virtual Wire compatibility mode. OEM ID: INTEL Product ID: GLENWOOD APIC at: 0xFEE00000 I/O APIC #2 Version 32 at 0xFEC00000. Setting APIC routing to xen Processors: 2 Allocating PCI resources starting at c4000000 (gap: c0000000:3ec00000) Built 1 zonelists. Total pages: 742074 Kernel command line: ro root=/dev/VolGroup01/LogVol00 noapic acpi=off console=tty console=ttyS0 console=xvc xenconsole=tc Initializing CPU#0 PID hash table entries: 4096 (order: 12, 32768 bytes) Xen reported: 3000.298 MHz processor. Console: colour VGA+ 80x25 Dentry cache hash table entries: 524288 (order: 10, 4194304 bytes) Inode-cache hash table entries: 262144 (order: 9, 2097152 bytes) Software IO TLB enabled: Aperture: 64 megabytes Kernel range: 0xffff880004b83000 - 0xffff880008b83000 PCI-DMA: Using software bounce buffering for IO (SWIOTLB) Memory: 2823548k/2968296k available (2320k kernel code, 135900k reserved, 1312k data, 168k init) Calibrating delay using timer specific routine.. 7504.29 BogoMIPS (lpj=15008593) Security Framework v1.0.0 initialized SELinux: Initializing. SELinux: Starting in permissive mode selinux_register_security: Registering secondary module capability Capability LSM initialized as secondary Mount-cache hash table entries: 256 CPU: Trace cache: 12K uops, L1 D cache: 16K CPU: L2 cache: 2048K CPU: Physical Processor ID: 0 CPU: Processor Core ID: 0 (SMP-)alternatives turned off Brought up 2 CPUs Initializing CPU#1 migration_cost=812 checking if image is initramfs... it is Grant table initialized NET: Registered protocol family 16 ACPI Exception (utmutex-0262): AE_BAD_PARAMETER, Thread 10387A0 could not acquire Mutex [2] [20060707] PCI: Using configuration type 1 ACPI: Interpreter disabled. Linux Plug and Play Support v0.97 (c) Adam Belay pnp: PnP ACPI: disabled xen_mem: Initialising balloon driver. usbcore: registered new driver usbfs usbcore: registered new driver hub PCI: Probing PCI hardware PCI: Ignoring BAR0-3 of IDE controller 0000:00:1f.1 PCI: Transparent bridge - 0000:00:1e.0 PCI: Using IRQ router PIIX/ICH [8086/27b8] at 0000:00:1f.0 PCI: Found IRQ 11 for device 0000:00:1f.1 PCI: Sharing IRQ 11 with 0000:00:1d.2 PCI: Sharing IRQ 11 with 0000:1a:04.0 NetLabel: Initializing NetLabel: domain hash size = 128 NetLabel: protocols = UNLABELED CIPSOv4 NetLabel: unlabeled traffic allowed by default PCI: Bridge: 0000:00:01.0 IO window: disabled. MEM window: disabled. PREFETCH window: disabled. PCI: Bridge: 0000:00:03.0 IO window: disabled. MEM window: disabled. PREFETCH window: disabled. PCI: Bridge: 0000:00:1c.0 IO window: 4000-4fff MEM window: d0100000-d01fffff PREFETCH window: c4000000-c40fffff PCI: Bridge: 0000:00:1c.4 IO window: disabled. MEM window: d0200000-d02fffff PREFETCH window: disabled. PCI: Bridge: 0000:00:1c.5 IO window: disabled. MEM window: d0300000-d03fffff PREFETCH window: disabled. PCI: Bridge: 0000:00:1e.0 IO window: 5000-5fff MEM window: d0400000-d04fffff PREFETCH window: d8000000-dfffffff PCI: Found IRQ 7 for device 0000:00:01.0 PCI: Sharing IRQ 7 with 0000:00:03.0 IRQ routing conflict for 0000:00:1c.0, have irq 10, want irq 7 IRQ routing conflict for 0000:00:1c.4, have irq 10, want irq 7 PCI: Sharing IRQ 7 with 0000:00:1d.3 PCI: Sharing IRQ 7 with 0000:05:00.0 PCI: Sharing IRQ 7 with 0000:01:00.0 PCI: Found IRQ 7 for device 0000:00:03.0 PCI: Sharing IRQ 7 with 0000:00:01.0 IRQ routing conflict for 0000:00:1c.0, have irq 10, want irq 7 IRQ routing conflict for 0000:00:1c.4, have irq 10, want irq 7 PCI: Sharing IRQ 7 with 0000:00:1d.3 PCI: Sharing IRQ 7 with 0000:05:00.0 PCI: Sharing IRQ 7 with 0000:01:00.0 PCI: Found IRQ 7 for device 0000:00:1c.0 PCI: Sharing IRQ 7 with 0000:00:01.0 PCI: Sharing IRQ 7 with 0000:00:03.0 IRQ routing conflict for 0000:00:1c.0, have irq 10, want irq 7 IRQ routing conflict for 0000:00:1c.4, have irq 10, want irq 7 PCI: Sharing IRQ 7 with 0000:00:1d.3 PCI: Sharing IRQ 7 with 0000:05:00.0 PCI: Sharing IRQ 7 with 0000:01:00.0 PCI: Found IRQ 7 for device 0000:00:1c.4 PCI: Sharing IRQ 7 with 0000:00:01.0 PCI: Sharing IRQ 7 with 0000:00:03.0 IRQ routing conflict for 0000:00:1c.0, have irq 10, want irq 7 IRQ routing conflict for 0000:00:1c.4, have irq 10, want irq 7 PCI: Sharing IRQ 7 with 0000:00:1d.3 PCI: Sharing IRQ 7 with 0000:05:00.0 PCI: Sharing IRQ 7 with 0000:01:00.0 PCI: Found IRQ 10 for device 0000:00:1c.5 IRQ routing conflict for 0000:00:1c.5, have irq 11, want irq 10 PCI: Sharing IRQ 10 with 0000:03:00.0 NET: Registered protocol family 2 IP route cache hash table entries: 131072 (order: 8, 1048576 bytes) TCP established hash table entries: 262144 (order: 10, 4194304 bytes) TCP bind hash table entries: 65536 (order: 8, 1048576 bytes) TCP: Hash tables configured (established 262144 bind 65536) TCP reno registered IA-32 Microcode Update Driver: v1.14-xen tigran@veritas.com audit: initializing netlink socket (disabled) audit(1190996114.036:1): initialized VFS: Disk quotas dquot_6.5.1 Dquot-cache hash table entries: 512 (order 0, 4096 bytes) SELinux: Registering netfilter hooks Initializing Cryptographic API ksign: Installing public key data Loading keyring - Added public key AB7AA145C3566FE7 - User ID: CentOS (Kernel Module GPG key) io scheduler noop registered io scheduler anticipatory registered io scheduler deadline registered io scheduler cfq registered (default) assign_interrupt_mode Found MSI capability assign_interrupt_mode Found MSI capability assign_interrupt_mode Found MSI capability assign_interrupt_mode Found MSI capability assign_interrupt_mode Found MSI capability pci_hotplug: PCI Hot Plug PCI Core version: 0.5 Real Time Clock Driver v1.12ac Non-volatile memory driver v1.2 Linux agpgart interface v0.101 (c) Dave Jones RAMDISK driver initialized: 16 RAM disks of 16384K size 4096 blocksize Xen virtual console successfully installed as ttyS0 Event-channel device installed. Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2 ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx ICH7: IDE controller at PCI slot 0000:00:1f.1 PCI: Found IRQ 11 for device 0000:00:1f.1 PCI: Sharing IRQ 11 with 0000:00:1d.2 PCI: Sharing IRQ 11 with 0000:1a:04.0 ICH7: chipset revision 1 ICH7: not 100% native mode: will probe irqs later ide0: BM-DMA at 0x30a0-0x30a7, BIOS settings: hda:DMA, hdb:pio ide1: BM-DMA at 0x30a8-0x30af, BIOS settings: hdc:pio, hdd:pio hda: UJDA770 DVD/CDRW, ATAPI CD/DVD-ROM drive ide0 at 0x1f0-0x1f7,0x3f6 on irq 14 ide-floppy driver 0.99.newide usbcore: registered new driver hiddev usbcore: registered new driver usbhid drivers/usb/input/hid-core.c: v2.6:USB HID core driver PNP: No PS/2 controller found. Probing ports directly. serio: i8042 AUX port at 0x60,0x64 irq 12 serio: i8042 KBD port at 0x60,0x64 irq 1 mice: PS/2 mouse device common for all mice md: md driver 0.90.3 MAX_MD_DEVS=256, MD_SB_DISKS=27 md: bitmap version 4.39 PCI: Sharing IRQ 7 with 0000:05:00.0 PCI: Sharing IRQ 7 with 0000:01:00.0 uhci_hcd 0000:00:1d.3: UHCI Host Controller uhci_hcd 0000:00:1d.3: new USB bus registered, assigned bus number 4 uhci_hcd 0000:00:1d.3: irq 7, io base 0x00003060 usb usb4: configuration #1 chosen from 1 choice hub 4-0:1.0: USB hub found hub 4-0:1.0: 2 ports detected PCI: Found IRQ 5 for device 0000:00:1d.7 PCI: Sharing IRQ 5 with 0000:00:1d.0 ehci_hcd 0000:00:1d.7: EHCI Host Controller ehci_hcd 0000:00:1d.7: new USB bus registered, assigned bus number 5 ehci_hcd 0000:00:1d.7: debug port 1 ehci_hcd 0000:00:1d.7: irq 5, io mem 0xd0000000 ehci_hcd 0000:00:1d.7: USB 2.0 started, EHCI 1.00, driver 10 Dec 2004 usb usb5: configuration #1 chosen from 1 choice hub 5-0:1.0: USB hub found hub 5-0:1.0: 8 ports detected SCSI subsystem initialized Fusion MPT base driver 3.04.02 Copyright (c) 1999-2005 LSI Logic Corporation Fusion MPT SAS Host driver 3.04.02 PCI: Found IRQ 7 for device 0000:05:00.0 PCI: Sharing IRQ 7 with 0000:00:01.0 PCI: Sharing IRQ 7 with 0000:00:03.0 IRQ routing conflict for 0000:00:1c.0, have irq 10, want irq 7 IRQ routing conflict for 0000:00:1c.4, have irq 10, want irq 7 PCI: Sharing IRQ 7 with 0000:00:1d.3 PCI: Sharing IRQ 7 with 0000:01:00.0 mptbase: Initiating ioc0 bringup ioc0: SAS1064E: Capabilities={Initiator} mptbase: Initiating ioc0 recovery BUG: soft lockup detected on CPU#1!

Call Trace: <IRQ> [<ffffffff802a76ad>] softlockup_tick+0xdb/0xed [<ffffffff8026ba66>] timer_interrupt+0x396/0x3f2 [<ffffffff80210a87>] handle_IRQ_event+0x2d/0x60 [<ffffffff802a79ec>] __do_IRQ+0xa4/0x105 [<ffffffff802699b3>] do_IRQ+0xe7/0xf5 [<ffffffff8038dde8>] evtchn_do_upcall+0x86/0xe0 [<ffffffff8025cc1a>] do_hypervisor_callback+0x1e/0x2c [<ffffffff8020c70a>] __delay+0x6/0x10 [<ffffffff880c2d0a>] :mptbase:WaitForDoorbellInt+0xbe/0xe9 [<ffffffff880c2f3f>] :mptbase:mpt_handshake_req_reply_wait+0x138/0x296 [<ffffffff880c38a3>] :mptbase:SendIocInit+0x242/0x325 [<ffffffff880c32d5>] :mptbase:GetIocFacts+0x7e/0x253 [<ffffffff880c4459>] :mptbase:MakeIocReady+0x62f/0xa67 [<ffffffff880c6b2b>] :mptbase:mpt_do_ioc_recovery+0xfbd/0xffd [<ffffffff803282e8>] __next_cpu+0x19/0x28 [<ffffffff8027efa9>] find_busiest_group+0x1db/0x44a [<ffffffff802809ca>] rebalance_tick+0x1be/0x411 [<ffffffff802958f4>] run_posix_cpu_timers+0x25/0x690 [<ffffffff880c6c1c>] :mptbase:mpt_HardResetHandler+0xb1/0x123 [<ffffffff880c6c8e>] :mptbase:mpt_timer_expired+0x0/0x24 [<ffffffff880c6c99>] :mptbase:mpt_timer_expired+0xb/0x24 [<ffffffff8028b7a4>] run_timer_softirq+0x13f/0x1c6 [<ffffffff80211ed3>] __do_softirq+0x62/0xdd [<ffffffff8025d0e8>] call_softirq+0x1c/0x28 [<ffffffff80269b3d>] do_softirq+0x31/0x98 [<ffffffff802699b8>] do_IRQ+0xec/0xf5 [<ffffffff8038dde8>] evtchn_do_upcall+0x86/0xe0 [<ffffffff8025cc1a>] do_hypervisor_callback+0x1e/0x2c <EOI> [<ffffffff802063aa>] hypercall_page+0x3aa/0x1000 [<ffffffff802063aa>] hypercall_page+0x3aa/0x1000 [<ffffffff8026afe2>] raw_safe_halt+0x84/0xa8 [<ffffffff802684f8>] xen_idle+0x38/0x4a [<ffffffff80247bcd>] cpu_idle+0x97/0xba

scsi0 : ioc0: LSISAS1064E, FwRev=01100000h, Ports=1, MaxQ=511, IRQ=7 mptbase: Initiating ioc0 recovery BUG: soft lockup detected on CPU#1!