[Xen-devel] Re: xen_pgd_pin BUG

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

What dom0 kernel are you running? What version of Xen?

 -- Keir

On 1/4/08 20:39, "Kimball Murray" <kimball.murray@xxxxxxxxx> wrote:

> Greetings.  I'm running a system with a single, HVM guest.  When I
> delete the guest, I trigger a BUG_ON statement in xen_pgd_pin
> (arch/i386/mm/hypervisor.c), which crashes dom0.  I did see some
> chatter about this same bug in various contexts a while ago, but
> didn't notice if there had been a resolution.  If it has been
> resolved, could someone point me in the right direction?  Thanks!
> 
> (XEN) mm.c:1769:d0 Bad type (saw 00000000e8000001 != exp 0000000020000000) for
> m
> fn 20cfa4 (pfn 1bda4)
> (XEN) mm.c:657:d0 Attempt to create linear p.t. with write perms
> (XEN) mm.c:1082:d0 Failure in alloc_l2_table: entry 2
> (XEN) mm.c:1790:d0 Error while validating mfn 1fbf62 (pfn 2cd62) for type
> 000000
> 0040000000: caf=80000003 taf=0000000040000001
> (XEN) mm.c:1156:d0 Failure in alloc_l3_table: entry 0
> (XEN) mm.c:1790:d0 Error while validating mfn 2007e1 (pfn 285e1) for type
> 000000
> 0060000000: caf=80000003 taf=0000000060000001
> (XEN) mm.c:2059:d0 Error while pinning mfn 2007e1
> ------------[ cut here ]------------
> kernel BUG at arch/i386/mm/hypervisor.c:186!
> invalid opcode: 0000 [#1]
> SMP
> last sysfs file: /class/net/biz0/bridge/forward_delay
> Modules linked in: tun mptctl mptbase usbhid dell_rbu firmware_class drbd cn
> ipm
> i_devintf ipmi_si ipmi_msghandler bridge ipv6 binfmt_misc dm_mirror
> dm_multipath
>  dm_mod video thermal sbs processor i2c_ec i2c_core fan container button
> battery
>  asus_acpi ac parport_pc lp parport nvram sr_mod cdrom evdev sg piix pcspkr
> ata_
> piix shpchp libata bnx2 pci_hotplug zlib_inflate serial_core serio_raw rtc
> ide_d
> isk megaraid_sas sd_mod scsi_mod raid1 ehci_hcd ohci_hcd uhci_hcd usbcore
> CPU:    0
> EIP:    0061:[<c011af1e>]    Not tainted VLI
> EFLAGS: 00210282  (2.6.18-8.1.8.el5.xs4.0.1.125.163xen #1)
> EIP is at xen_pgd_pin+0x6e/0x80
> eax: ffffffea  ebx: ec353ebc  ecx: 00000001  edx: 00000000
> esi: 00007ff0  edi: 00000000  ebp: ec353ed0  esp: ec353ebc
> ds: 007b  es: 007b  ss: 0069
> Process spine (pid: 8727, ti=ec352000 task=dcf9f7f0 task.ti=ec352000)
> Stack: 00000002 002007e1 00000000 0050bc20 d9c026fc ec353edc c0115852 df8ae200
>       ec353ee8 c011587f 01200011 ec353ef0 c0116519 ec353f64 c0122c69 d9c02b90
>       dcd9dddc dcd9dddc c06a7778 df8ae238 efb8eeec ec353fbc bfc97874 00000000
> Call Trace:
>  [<c010640a>] show_trace_log_lvl+0x1a/0x30
>  [<c01064d1>] show_stack_log_lvl+0xb1/0xe0
>  [<c01066aa>] show_registers+0x1aa/0x230
>  [<c010687a>] die+0x14a/0x310
>  [<c0106abf>] do_trap+0x7f/0xb0
>  [<c0107357>] do_invalid_op+0x97/0xb0
>  [<c0105cdb>] error_code+0x2b/0x30
>  [<c0115852>] __pgd_pin+0x32/0x40
>  [<c011587f>] mm_pin+0x1f/0x30
>  [<c0116519>] _arch_dup_mmap+0x29/0x30
>  [<c0122c69>] copy_process+0x1139/0x12d0
>  [<c0122e50>] do_fork+0x50/0x150
>  [<c010322f>] sys_clone+0x2f/0x40
>  [<c0105b37>] syscall_call+0x7/0xb
>  =======================
> Code: 31 d2 be f0 7f 00 00 e8 41 64 fe ff 85 c0 78 1b 8b 5d f8 8b 75 fc 89 ec
> 5d
>  c3 8d 76 00 39 c2 72 c6 0f 0b 22 00 24 74 32 c0 eb bc <0f> 0b ba 00 3a 97 32
> c0
>  eb db 90 8d b4 26 00 00 00 00 55 89 c2



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