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    Subjectkernel BUG at arch/x86/xen/multicalls.c:204!
    Hi,

    while booting the 2.6.29-gentoo-r5 kernel as xen domU guest I got the following kernel BUG.

    I have not tried a vanilla 2.6.29 kernel, but can if requested, .config is also available on reguest.

    thanks,

    R.


    Started domain
    Linux version 2.6.29-gentoo-r5 (root@regula) (gcc version 4.3.2 (Gentoo 4.3.2-r3 p1.6,
    pie-10.1.5) ) #1 SMP Fri May 29 23:52:55 CEST 2009
    Command line: root=/dev/xvda1 ro xencons=hvc0 xen_fbfront.video=4,1152,864
    KERNEL supported cpus:
    Intel GenuineIntel
    AMD AuthenticAMD
    Centaur CentaurHauls
    BIOS-provided physical RAM map:
    Xen: 0000000000000000 - 00000000000a0000 (usable)
    Xen: 00000000000a0000 - 0000000000100000 (reserved)
    Xen: 0000000000100000 - 0000000000e91000 (usable)
    Xen: 0000000000e91000 - 000000000161e000 (reserved)
    Xen: 000000000161e000 - 00000000f1400000 (usable)
    DMI not present or invalid.
    last_pfn = 0xf1400 max_arch_pfn = 0x100000000
    init_memory_mapping: 0000000000000000-00000000f1400000
    last_map_addr: f1400000 end: f1400000
    (5 early reservations) ==> bootmem [0000000000 - 00f1400000]
    #0 [0000000000 - 0000001000] BIOS data page ==> [0000000000 - 0000001000]
    #1 [000161e000 - 000162d000] XEN PAGETABLES ==> [000161e000 - 000162d000]
    #2 [0000006000 - 0000008000] TRAMPOLINE ==> [0000006000 - 0000008000]
    #3 [0000200000 - 0000e90f18] TEXT DATA BSS ==> [0000200000 - 0000e90f18]
    #4 [000162d000 - 0001daa000] PGTABLE ==> [000162d000 - 0001daa000]
    Zone PFN ranges:
    DMA 0x00000000 -> 0x00001000
    DMA32 0x00001000 -> 0x00100000
    Normal 0x00100000 -> 0x00100000
    Movable zone start PFN for each node
    early_node_map[3] active PFN ranges
    0: 0x00000000 -> 0x000000a0
    0: 0x00000100 -> 0x00000e91
    0: 0x0000161e -> 0x000f1400
    SMP: Allowing 8 CPUs, 0 hotplug CPUs
    No local APIC present
    Allocating PCI resources starting at f2000000 (gap: f1400000:ec00000)
    NR_CPUS:4096 nr_cpumask_bits:8 nr_cpu_ids:8 nr_node_ids:1
    PERCPU: Allocating 73728 bytes of per cpu data
    Built 1 zonelists in Zone order, mobility grouping on. Total pages: 969402
    Kernel command line: root=/dev/xvda1 ro xencons=hvc0 xen_fbfront.video=4,1152,864
    Initializing CPU#0
    PID hash table entries: 4096 (order: 12, 32768 bytes)
    Detected 2499.996 MHz processor.
    Console: colour dummy device 80x25
    console [tty0] enabled
    console [hvc0] enabled
    Dentry cache hash table entries: 524288 (order: 10, 4194304 bytes)
    Inode-cache hash table entries: 262144 (order: 9, 2097152 bytes)
    Checking aperture...
    No AGP bridge found
    Memory: 3856500k/3952640k available (2253k kernel code, 8116k absent, 87672k reserved, 2269k data, 476k init)
    installing Xen timer for CPU 0
    Calibrating delay loop (skipped), value calculated using timer frequency.. 4999.99 BogoMIPS (lpj=24999960)
    Mount-cache hash table entries: 256
    CPU: L1 I cache: 32K, L1 D cache: 32K
    CPU: L2 cache: 6144K
    CPU: Physical Processor ID: 0
    CPU: Processor Core ID: 0
    Freeing SMP alternatives: 27k freed
    cpu 0 spinlock event irq 1
    installing Xen timer for CPU 1
    cpu 1 spinlock event irq 7
    Initializing CPU#1
    CPU: L1 I cache: 32K, L1 D cache: 32K
    CPU: L2 cache: 6144K
    CPU: Physical Processor ID: 0
    CPU: Processor Core ID: 0
    installing Xen timer for CPU 2
    cpu 2 spinlock event irq 13
    Initializing CPU#2
    CPU: L1 I cache: 32K, L1 D cache: 32K
    CPU: L2 cache: 6144K
    CPU: Physical Processor ID: 0
    CPU: Processor Core ID: 0
    installing Xen timer for CPU 3
    cpu 3 spinlock event irq 19
    Initializing CPU#3
    CPU: L1 I cache: 32K, L1 D cache: 32K
    CPU: L2 cache: 6144K
    CPU: Physical Processor ID: 0
    CPU: Processor Core ID: 0
    installing Xen timer for CPU 4
    cpu 4 spinlock event irq 25
    Initializing CPU#4
    CPU: L1 I cache: 32K, L1 D cache: 32K
    CPU: L2 cache: 6144K
    CPU: Physical Processor ID: 0
    CPU: Processor Core ID: 0
    installing Xen timer for CPU 5
    cpu 5 spinlock event irq 31
    Initializing CPU#5
    CPU: L1 I cache: 32K, L1 D cache: 32K
    CPU: L2 cache: 6144K
    CPU: Physical Processor ID: 0
    CPU: Processor Core ID: 0
    installing Xen timer for CPU 6
    cpu 6 spinlock event irq 37
    Initializing CPU#6
    CPU: L1 I cache: 32K, L1 D cache: 32K
    CPU: L2 cache: 6144K
    CPU: Physical Processor ID: 0
    CPU: Processor Core ID: 0
    installing Xen timer for CPU 7
    cpu 7 spinlock event irq 43
    Initializing CPU#7
    CPU: L1 I cache: 32K, L1 D cache: 32K
    CPU: L2 cache: 6144K
    CPU: Physical Processor ID: 0
    CPU: Processor Core ID: 0
    Brought up 8 CPUs
    net_namespace: 1824 bytes
    Booting paravirtualized kernel on Xen
    Xen version: 3.3.1 (preserve-AD)
    xor: automatically using best checksumming function: generic_sse
    generic_sse: 2581.600 MB/sec
    xor: using function: generic_sse (2581.600 MB/sec)
    Grant table initialized
    NET: Registered protocol family 16
    PCI: Fatal: No config space access function found
    bio: create slab <bio-0> at 0
    xen_balloon: Initialising balloon driver.
    SCSI subsystem initialized
    PCI: System does not support PCI
    PCI: System does not support PCI
    NET: Registered protocol family 2
    Switched to NOHz mode on CPU #0
    Switched to NOHz mode on CPU #1
    Switched to NOHz mode on CPU #2
    Switched to NOHz mode on CPU #3
    Switched to NOHz mode on CPU #4
    Switched to NOHz mode on CPU #5
    Switched to NOHz mode on CPU #6
    Switched to NOHz mode on CPU #7
    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
    NET: Registered protocol family 1
    platform rtc_cmos: registered platform RTC device (no PNP device found)
    msgmni has been set to 7720
    alg: No test for stdrng (krng)
    async_tx: api initialized (sync-only)
    io scheduler noop registered
    io scheduler anticipatory registered (default)
    io scheduler deadline registered
    io scheduler cfq registered
    Non-volatile memory driver v1.3
    Linux agpgart interface v0.103
    Console: switching to colour frame buffer device 144x54
    console [tty0] enabled
    loop: module loaded
    Initialising Xen virtual ethernet driver.
    blkfront: xvda: barriers enabled
    xvda: xvda1 xvda2
    Driver 'sd' needs updating - please use bus_type methods
    i8042.c: No controller found.
    blkfront: xvdb: barriers enabled
    mice: PS/2 mouse device common for all mice
    xvdb:<6>input: PC Speaker as /class/input/input0
    unknown partition table
    input: Xen Virtual Keyboard as /class/input/input1
    input: Xen Virtual Pointer as /class/input/input2
    rtc_cmos: probe of rtc_cmos failed with error -16
    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: int64x1 2063 MB/s
    raid6: int64x2 2748 MB/s
    raid6: int64x4 2264 MB/s
    raid6: int64x8 1879 MB/s
    raid6: sse2x1 2936 MB/s
    raid6: sse2x2 5518 MB/s
    raid6: sse2x4 6267 MB/s
    raid6: using algorithm sse2x4 (6267 MB/s)
    md: raid6 personality registered for level 6
    md: raid5 personality registered for level 5
    md: raid4 personality registered for level 4
    md: multipath personality registered for level -4
    device-mapper: ioctl: 4.14.0-ioctl (2008-04-23) initialised: dm-devel@redhat.com
    cpuidle: using governor ladder
    cpuidle: using governor menu
    IPv4 over IPv4 tunneling driver
    GRE over IPv4 tunneling driver
    TCP cubic registered
    NET: Registered protocol family 17
    IO APIC resources could be not be allocated.
    registered taskstats version 1
    XENBUS: Device with no driver: device/console/0
    drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
    md: Waiting for all devices to be available before autodetect
    md: If you don't use raid, use raid=noautodetect
    md: Autodetecting RAID arrays.
    md: Scanned 0 and added 0 devices.
    md: autorun ...
    md: ... autorun DONE.
    EXT3-fs: INFO: recovery required on readonly filesystem.
    EXT3-fs: write access will be enabled during recovery.
    kjournald starting. Commit interval 5 seconds
    EXT3-fs: recovery complete.
    EXT3-fs: mounted filesystem with ordered data mode.
    VFS: Mounted root (ext3 filesystem) readonly on device 202:1.
    Freeing unused kernel memory: 476k freed
    ------------[ cut here ]------------
    kernel BUG at arch/x86/xen/multicalls.c:204!
    invalid opcode: 0000 [#1] SMP
    last sysfs file:
    CPU 0
    Modules linked in:
    Pid: 959, comm: bash Not tainted 2.6.29-gentoo-r5 #1
    RIP: e030:[<ffffffff8020be37>] [<ffffffff8020be37>] __xen_mc_entry+0x8e/0xaf
    RSP: e02b:ffff8800ef0a13d8 EFLAGS: 00010006
    RAX: 0000000000000218 RBX: ffff880001de0070 RCX: 0000000000000000
    RDX: 0000000000000000 RSI: 0000000000001000 RDI: 0000000000000000
    RBP: 0000000000000218 R08: 0000000000000040 R09: 0000000000000040
    R10: 00000000000e9568 R11: 0000000000000001 R12: 00007f9da8753315
    R13: 0000000000000000 R14: ffff8800f04a0a98 R15: ffff8800f04a4480
    FS: 00007f9da87526f0(0000) GS:ffffffff80c0e000(0000) knlGS:0000000000000000
    CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b
    CR2: 00007f9da8753315 CR3: 00000000efec2000 CR4: 0000000000002620
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    Process bash (pid: 959, threadinfo ffff8800ef0a0000, task ffff8800ef4428f0)
    Stack:
    0000000000000000 0000000000000000 0000000000000000 0000000000000000
    0000000000000000 0000000000000200 ffff8800ef0a1438 ffffffff8020aa5d
    0000000000000000 0000000000000000 0000000000000000 0000000000000000
    Call Trace:
    [<ffffffff8020aa5d>] ? xen_flush_tlb_others+0xb9/0x15d
    [<ffffffff8021b390>] ? flush_tlb_page+0xa0/0xad
    [<ffffffff80271feb>] ? do_wp_page+0x648/0x76a
    [<ffffffff8020bd2e>] ? xen_mc_flush+0x13c/0x162
    [<ffffffff8027385e>] ? handle_mm_fault+0x739/0x7ea
    [<ffffffff80430862>] ? _spin_unlock_irqrestore+0x14/0x17
    [<ffffffff8022308c>] ? do_page_fault+0x5a5/0x969
    [<ffffffff802fc84c>] ? __make_request+0x39b/0x3df
    [<ffffffff802a4683>] ? sync_buffer+0x0/0x40
    [<ffffffff8042f262>] ? io_schedule+0x2d/0x39
    [<ffffffff8042f559>] ? __wait_on_bit+0x62/0x70
    [<ffffffff802a4683>] ? sync_buffer+0x0/0x40
    [<ffffffff8042f5d2>] ? out_of_line_wait_on_bit+0x6b/0x77
    [<ffffffff80249496>] ? wake_bit_function+0x0/0x23
    [<ffffffff80309105>] ? kobject_get+0x12/0x17
    [<ffffffff8028945f>] ? cdev_get+0x40/0x57
    [<ffffffff80289482>] ? exact_lock+0xc/0x14
    [<ffffffff80355cee>] ? kobj_lookup+0x125/0x15f
    [<ffffffff804309bd>] ? lock_kernel+0x23/0x33
    [<ffffffff804309f8>] ? unlock_kernel+0x2b/0x2d
    [<ffffffff803224f8>] ? memory_open+0xd6/0xde
    [<ffffffff80289712>] ? chrdev_open+0x15a/0x179
    [<ffffffff802895b8>] ? chrdev_open+0x0/0x179
    [<ffffffff8028590f>] ? __dentry_open+0x156/0x241
    [<ffffffff80291352>] ? do_filp_open+0x3ec/0x7eb
    [<ffffffff80430b05>] ? page_fault+0x25/0x30
    Code: 07 48 c1 e8 03 8d 14 c5 00 00 00 00 8b 8b 00 14 00 00 8d 41 01 89 83 00 14 00 00 8d 04 2a 89 83 04 14 00 00 3d 00
    02 00 00 76 04 <0f> 0b eb fe 89 d0 48 83 c4 28 48 8d 94 03 00 10 00 00 89 c8 48
    RIP [<ffffffff8020be37>] __xen_mc_entry+0x8e/0xaf
    RSP <ffff8800ef0a13d8>
    ---[ end trace 27270f261602e287 ]---
    ------------[ cut here ]------------
    kernel BUG at arch/x86/xen/multicalls.c:190!
    invalid opcode: 0000 [#2] SMP
    last sysfs file:
    CPU 0
    Modules linked in:
    Pid: 959, comm: bash Tainted: G D 2.6.29-gentoo-r5 #1
    RIP: e030:[<ffffffff8020bdd3>] [<ffffffff8020bdd3>] __xen_mc_entry+0x2a/0xaf
    RSP: e02b:ffff8800ef0a1068 EFLAGS: 00010006
    RAX: 0000000000000218 RBX: ffff880001de0070 RCX: 0000000000000000
    RDX: ffff880081215000 RSI: 0000000000201000 RDI: 0000000000000018
    RBP: 0000000000000018 R08: 0000000000000000 R09: 0000000000002a7d
    R10: ffffffff8025f8c3 R11: 0000000000000000 R12: 0000000000000201
    R13: ffff8800ef6d90a0 R14: ffff8800f04a0a98 R15: ffff8800f04a4480
    FS: 00007f9da87526f0(0000) GS:ffffffff80c0e000(0000) knlGS:0000000000000000
    CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b
    CR2: 00007f9da8753315 CR3: 0000000000201000 CR4: 0000000000002620
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    Process bash (pid: 959, threadinfo ffff8800ef0a0000, task ffff8800ef4428f0)
    Stack:
    000000000000311d ffffffff8024c34c ffffffff80430d46 0000000000000000
    000000000000000c 00000000002005fc 0000000000201000 ffffffff8020af1e
    ffffffff80679300 0000000000000000 ffffffff80bd74f0 ffffffff80210ded
    Call Trace:
    [<ffffffff8024c34c>] ? up+0xe/0x36
    [<ffffffff80430d46>] ? error_exit+0x36/0x70
    [<ffffffff8020af1e>] ? __xen_write_cr3+0x66/0xec
    [<ffffffff80210ded>] ? retint_restore_args+0x5/0x20
    [<ffffffff8020aff6>] ? xen_write_cr3+0x52/0xb2
    [<ffffffff8021b2be>] ? leave_mm+0x42/0x45
    [<ffffffff8020922a>] ? _stext+0x22a/0x1000
    [<ffffffff8020c7df>] ? xen_exit_mmap+0x50/0x1d9
    [<ffffffff8020922a>] ? _stext+0x22a/0x1000
    [<ffffffff802773d5>] ? exit_mmap+0x49/0x134
    [<ffffffff80235699>] ? mmput+0x23/0xab
    [<ffffffff80238bea>] ? exit_mm+0xfc/0x107
    [<ffffffff8025f8c3>] ? acct_update_integrals+0xa1/0xa9
    [<ffffffff8023a693>] ? do_exit+0x178/0x706
    [<ffffffff80430862>] ? _spin_unlock_irqrestore+0x14/0x17
    [<ffffffff80237d43>] ? release_console_sem+0x197/0x1cc
    [<ffffffff80213cd1>] ? oops_end+0x96/0x9b
    [<ffffffff80212200>] ? do_invalid_op+0x8c/0x96
    [<ffffffff8020be37>] ? __xen_mc_entry+0x8e/0xaf
    [<ffffffff8021121b>] ? invalid_op+0x1b/0x20
    [<ffffffff8020be37>] ? __xen_mc_entry+0x8e/0xaf
    [<ffffffff8020be03>] ? __xen_mc_entry+0x5a/0xaf
    [<ffffffff8020aa5d>] ? xen_flush_tlb_others+0xb9/0x15d
    [<ffffffff8021b390>] ? flush_tlb_page+0xa0/0xad
    [<ffffffff80271feb>] ? do_wp_page+0x648/0x76a
    [<ffffffff8020bd2e>] ? xen_mc_flush+0x13c/0x162
    [<ffffffff8027385e>] ? handle_mm_fault+0x739/0x7ea
    [<ffffffff80430862>] ? _spin_unlock_irqrestore+0x14/0x17
    [<ffffffff8022308c>] ? do_page_fault+0x5a5/0x969
    [<ffffffff802fc84c>] ? __make_request+0x39b/0x3df
    [<ffffffff802a4683>] ? sync_buffer+0x0/0x40
    [<ffffffff8042f262>] ? io_schedule+0x2d/0x39
    [<ffffffff8042f559>] ? __wait_on_bit+0x62/0x70
    [<ffffffff802a4683>] ? sync_buffer+0x0/0x40
    [<ffffffff8042f5d2>] ? out_of_line_wait_on_bit+0x6b/0x77
    [<ffffffff80249496>] ? wake_bit_function+0x0/0x23
    [<ffffffff80309105>] ? kobject_get+0x12/0x17
    [<ffffffff8028945f>] ? cdev_get+0x40/0x57
    [<ffffffff80289482>] ? exact_lock+0xc/0x14
    [<ffffffff80355cee>] ? kobj_lookup+0x125/0x15f
    [<ffffffff804309bd>] ? lock_kernel+0x23/0x33
    [<ffffffff804309f8>] ? unlock_kernel+0x2b/0x2d
    [<ffffffff803224f8>] ? memory_open+0xd6/0xde
    [<ffffffff80289712>] ? chrdev_open+0x15a/0x179
    [<ffffffff802895b8>] ? chrdev_open+0x0/0x179
    [<ffffffff8028590f>] ? __dentry_open+0x156/0x241
    [<ffffffff80291352>] ? do_filp_open+0x3ec/0x7eb
    [<ffffffff80430b05>] ? page_fault+0x25/0x30
    Code: c3 55 48 c7 c0 70 b0 bc 80 53 48 89 fd 48 83 ec 28 65 48 8b 14 25 08 00 00 00 48 8d 1c 10 8b 83 04 14 00 00 3d 00
    02 00 00 76 04 <0f> 0b eb fe 83 bb 00 14 00 00 20 74 1e 89 c0 48 83 c0 07 48 c1
    RIP [<ffffffff8020bdd3>] __xen_mc_entry+0x2a/0xaf
    RSP <ffff8800ef0a1068>
    ---[ end trace 27270f261602e288 ]---
    Fixing recursive fault but reboot is needed!
    ------------[ cut here ]------------
    kernel BUG at arch/x86/xen/multicalls.c:190!
    invalid opcode: 0000 [#3] SMP
    last sysfs file:
    CPU 0
    Modules linked in:
    Pid: 959, comm: bash Tainted: G D 2.6.29-gentoo-r5 #1
    RIP: e030:[<ffffffff8020bdd3>] [<ffffffff8020bdd3>] __xen_mc_entry+0x2a/0xaf
    RSP: e02b:ffffffff80b3bde8 EFLAGS: 00010006
    RAX: 0000000000000218 RBX: ffff880001de0070 RCX: ffff8800ef4428f0
    RDX: ffff880081215000 RSI: ffffffff80509b58 RDI: 0000000000000000
    RBP: 0000000000000000 R08: 0000000000000000 R09: ffff880001de68c0
    R10: 000000000000000c R11: ffffffff8024ce94 R12: ffffffff80509b58
    R13: ffffffff80509b58 R14: ffff880001dec840 R15: 0000000000000000
    FS: 00007f9da87526f0(0000) GS:ffffffff80c0e000(0000) knlGS:0000000000000000
    CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b
    CR2: 00007f9da8753315 CR3: 0000000000201000 CR4: 0000000000002620
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    Process bash (pid: 959, threadinfo ffff8800ef0a0000, task ffff8800ef4428f0)
    Stack:
    ffffffff80b94a80 0000000000000000 ffffffff8020d915 ffff8800ef654b30
    0000000000000000 0000000000000000 ffff8800ef4428f0 ffffffff8020ac8f
    0001fefa72fa5670 000000005e15863e 000000000030d927 000000007612a333
    Call Trace:
    Code: c3 55 48 c7 c0 70 b0 bc 80 53 48 89 fd 48 83 ec 28 65 48 8b 14 25 08 00 00 00 48 8d 1c 10 8b 83 04 14 00 00 3d 00
    02 00 00 76 04 <0f> 0b eb fe 83 bb 00 14 00 00 20 74 1e 89 c0 48 83 c0 07 48 c1
    RIP [<ffffffff8020bdd3>] __xen_mc_entry+0x2a/0xaf
    RSP <ffffffff80b3bde8>
    ---[ end trace 27270f261602e289 ]---
    Fixing recursive fault but reboot is needed!


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