On Wed, Sep 8, 2010 at 7:42 AM, Jiang, Yunhong <yunhong.jiang@intel.com>wrote:

>  I forgot in which step in my experiment that the BUG happens, so not sure
> if it  is related to the UP/SMP kexec kernel.
>
> But yes, I didn't notice this UP requirement, will try it in future. Thanks
> for remind.
>


> (BTW, this is only for the kexec kernel so it should be acceptable).
>

That's a very meaningful point. One that's not made explicitly clear in the
docs. Thanks for pointing it out, that makes a big difference.

-Bruce


>
>
> Thanks
>
> --jyh
>
>
>
>
>
> *From:* Bruce Edge [mailto:bruce.edge@gmail.com]
> *Sent:* Wednesday, September 08, 2010 6:38 AM
> *To:* Jiang, Yunhong
> *Cc:* xen-devel
> *Subject:* Re: [Xen-devel] [Question] Has anyone tried kexec/kdump
>
>
>
>
>
> On Wed, Apr 28, 2010 at 2:07 AM, Jiang, Yunhong <yunhong.jiang@intel.com>
> wrote:
>
> I tried kexec on xen environment and get followed error. Does anyone meet
> similar issues? Does anyone try kexec/kdump recendly?
>
>
>
> Did you ever get this working?
>
>
>
> I noticed that the kdump docs state that you have to have CONFIG_SMP=n
> (Documentation/kdump/kdump.txt), this seems like a huge limitation in this
> era of multicore machines.
>
>
>
> -Bruce
>
>
>
> Xen Changeset: 21230:c87ec146229a and Dom0 is pvops dom0.
>
> Thanks
> --jyh
>
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.491275] BUG: unable to handle
> kernel NULL pointer dereference at (null)
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003] IP: [<ffffffff8102c39a>]
> xen_page_pinned+0x1d/0x3c
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003] PGD 11006067 PUD
> 11078067 PMD 0
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003] Oops: 0000 [#1] SMP
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003] last sysfs file:
> /sys/module/libata/version
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003] CPU 0
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003] Modules linked in: igb
> sg sr_mod cdrom ata_generic pata_acpi ahci ide_gd_mod ide_core usb_storage
> ata_piix libata sd_mod scsi_mod ehci_hcd ohci_hcd uhci_hcd
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003] Pid: 3591, comm: kexec
> Not tainted 2.6.31.13 #1 To Be Filled By O.E.M.
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003] RIP:
> e030:[<ffffffff8102c39a>]  [<ffffffff8102c39a>] xen_page_pinned+0x1d/0x3c
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003] RSP:
> e02b:ffff880011011e18  EFLAGS: 00010246
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003] RAX: 0000000000000000
> RBX: 0000000780000000 RCX: ffff880011011e38
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003] RDX: 0000000000000000
> RSI: 000000002dbb4063 RDI: 00000000000f0000
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003] RBP: ffff880011011e28
> R08: 0000000000000003 R09: ffff880011011e38
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003] R10: ffff880011011e38
> R11: 0000000000000002 R12: ffff880011004000
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003] R13: 0000000000000001
> R14: 000000002dbb4063 R15: ffff88001104f000
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003] FS:
>  00007f0311e606f0(0000) GS:ffffc90000000000(0000) knlGS:0000000000000000
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003] CS:  e033 DS: 0000 ES:
> 0000 CR0: 000000008005003b
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003] CR2: 0000000000000000
> CR3: 00000000110a1000 CR4: 0000000000002660
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003] DR0: 0000000000000000
> DR1: 0000000000000000 DR2: 0000000000000000
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003] DR3: 0000000000000000
> DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003] Process kexec (pid:
> 3591, threadinfo ffff880011010000, task ffff880011893c80)
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003] Stack:
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003]  ffff880011004000
> ffff880011004000 ffff880011011e58 ffffffff8102d58d
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003] <0> ffff880011004000
> 0000000040000000 ffff880011039000 0000008000000000
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003] <0> ffff880011011e68
> ffffffff8104ab25 ffff880011011ee8 ffffffff8104b1ea
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003] Call Trace:
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003]  [<ffffffff8102d58d>]
> xen_set_pgd+0x41/0xba
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003]  [<ffffffff8104ab25>]
> set_pgd+0x17/0x1b
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003]  [<ffffffff8104b1ea>]
> machine_kexec_prepare+0x56b/0x60b
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003]  [<ffffffff81097110>]
> sys_kexec_load+0x27d/0x561
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003]  [<ffffffff81525bd0>] ?
> thread_return+0x7e/0x95
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003]  [<ffffffff810a6a68>] ?
> audit_syscall_entry+0xfe/0x12a
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003]  [<ffffffff81032c82>]
> system_call_fastpath+0x16/0x1b
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003] Code: 48 89 c7 74 07 31
> f6 e8 c5 06 0a 00 c9 c3 55 48 89 e5 53 48 83 ec 08 e8 a9 a4 02 00 48 89 c3
> 48 c1 eb 0c 48 89 df e8 1a f6 ff ff <48> 8b 38 48 6b c3 38 48 83 e7 fc 48 01
> c7 e8 22 f6 ff ff 5a 5b
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003] RIP
>  [<ffffffff8102c39a>] xen_page_pinned+0x1d/0x3c
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003]  RSP <ffff880011011e18>
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003] CR2: 0000000000000000
> Apr 29 00:57:36 vt_wb_jimmy kernel: [   60.492003] ---[ end trace
> 4c3a1aad9172f2c6 ]---
>
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