On Wed, Sep 8, 2010 at 7:42 AM, Jiang, Yunhong <= span dir=3D"ltr"><yunhong.jia= ng@intel.com> wrote:

I forgot in which step in my experiment that the BUG happens, so not sure if it=A0 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.

=A0

(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

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=A0

Thanks

--jyh

=A0

=A0

F= rom: Bruce Edge = [mailto:bruce.edg= e@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

=A0

=A0

On Wed, Apr 28, 2010 at 2:07 AM= , Jiang, Yunhong <yu= nhong.jiang@intel.com> wrote:

I tried kexec on xen environmen= t and get followed error. Does anyone meet similar issues? Does anyone try kexec/kdum= p recendly?

=A0

Did you ever get this working?<= /span>

=A0

I noticed that the kdump docs s= tate that you have to have CONFIG_SMP=3Dn (Documentation/kdump/kdump.txt), this seems= like a huge limitation in this era of multicore machines.

=A0

-Bruce

=A0

Xen Changeset: 21230:c87ec14622= 9a and Dom0 is pvops dom0.

Thanks
--jyh

Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.491275] BUG: unable to handle kernel NULL pointer dereference at (null)
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] IP: [<ffffffff8102c39a>] xen_page_pinned+0x1d/0x3c
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] PGD 11006067 PUD 11078067 PMD 0
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] Oops: 0000 [#1] SMP Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] last sysfs file: /sys/module/libata/version
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] CPU 0
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 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: [ =A0 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: [ =A0 60.492003] RIP: e030:[<ffffffff8102c39a>] =A0[<ffffffff8102c39a>] xen_page_pinned+0x1d/0x3c
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] RSP: e02b:ffff880011011e18 =A0EFLAGS: 00010246
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] RAX: 0000000000000000 RBX: 0000000780000000 RCX: ffff880011011e38
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] RDX: 0000000000000000 RSI: 000000002dbb4063 RDI: 00000000000f0000
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] RBP: ffff880011011e28 R08: 0000000000000003 R09: ffff880011011e38
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] R10: ffff880011011e38 R11: 0000000000000002 R12: ffff880011004000
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] R13: 0000000000000001 R14: 000000002dbb4063 R15: ffff88001104f000
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] FS: =A000007f0311e606f0(0000) GS:ffffc90000000000(0000) knlGS:0000000000000000<= br> Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] CS: =A0e033 DS: 0000 ES: 0000 CR0: 000000008005003b
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] CR2: 0000000000000000 CR3: 00000000110a1000 CR4: 0000000000002660
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] Process kexec (pid: 3591, threadinfo ffff880011010000, task ffff880011893c80)
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] Stack:
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] =A0ffff880011004000 ffff880011004000 ffff880011011e58 ffffffff8102d58d
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] <0> ffff880011004000 0000000040000000 ffff880011039000 0000008000000000
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] <0> ffff880011011e68 ffffffff8104ab25 ffff880011011ee8 ffffffff8104b1ea
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] Call Trace:
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] =A0[<ffffffff8102d58d>] xen_set_pgd+0x41/0xba
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] =A0[<ffffffff8104ab25>] set_pgd+0x17/0x1b
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] =A0[<ffffffff8104b1ea>] machine_kexec_prepare+0x56b/0x60b
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] =A0[<ffffffff81097110>] sys_kexec_load+0x27d/0x561
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] =A0[<ffffffff81525bd0>] ? thread_return+0x7e/0x95
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] =A0[<ffffffff810a6a68>] ? audit_syscall_entry+0xfe/0x12a
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] =A0[<ffffffff81032c82>] system_call_fastpath+0x16/0x1b
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] Code: 48 89 c7 74 07 3= 1 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 4= 8 01 c7 e8 22 f6 ff ff 5a 5b
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] RIP =A0[<ffffffff8102c39a>] xen_page_pinned+0x1d/0x3c
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] =A0RSP <ffff880011011e18>
Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] CR2: 0000000000000000<= br> Apr 29 00:57:36 vt_wb_jimmy kernel: [ =A0 60.492003] ---[ end trace 4c3a1aad9172f2c6 ]---

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=A0

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