Re: [Xen-devel] KDB in Xen 4.4

[Xin Xu <jungle.xuxin@xxxxxxxxx>]

Mukesh Rathor <mukesh.rathor <at> oracle.com> writes:

> 
> On Sun, 30 Mar 2014 23:02:19 -0700
> Neil Sikka <neilsikka <at> gmail.com> wrote:
> 
> > Hi. Mukesh Rathor's KDB debugger (nice work by the way, Mukesh)
> > worked in Xen4.1.0-rc3-pre  from this tree (
> > http://xenbits.xensource.com/ext/debuggers.hg/rev/700ac6445812) when I
> > tried to compile and use it, but I see it has not been committed to
> > the latest Xen 4.4 version. Is there any plan to do so? If not, would
> > it be expected to work if I exported the diff from the tree linked
> > above and applied it to the 4.4 tree?
> > 
> > Thanks,
> > Neil
> > 
> 
> Thanks Neil. I'm attaching a patch for kdb that should apply with 
> minor tweaks since I've it on top of PVH patches. 
> 
> At this point I don't intend to go thru the review process to upstream
> it. May be in far future.
> 
> thanks,
> Mukesh
> 
> 
> Attachment (0001-KDB-initial-patch.patch): text/x-patch, 546 KiB
> Attachment (kdb-timer.patch): text/x-patch, 2309 bytes
> 
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Hi Mukesh,

I applied your patches to xen 4.4.0 source, It can be applied without 
errors, and built OK. I install it in ubuntu 12.04. After I reboot the 
system, it has a fatal error, and system cannot boot. I put the serial 
console log below. Do you have any ideas about what causes this problem? any 
suggestions will be appreciated. Thank you.



[    0.000000] Booting paravirtualized kernel on Xen
[    0.000000] Xen version: 4.4.0 (preserve-AD)
[    0.000000] setup_percpu: NR_CPUS:256 nr_cpumask_bits:256 nr_cpu_ids:4 
nr_node_ids:1
[    0.000000] PERCPU: Embedded 28 pages/cpu @ffff8800bfe9b000 s83072 r8192 
d23424 u114688
[    0.000000] pcpu-alloc: s83072 r8192 d23424 u114688 alloc=28*4096
[    0.000000] pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3 
[    0.000000] Built 1 zonelists in Node order, mobility grouping on.  Total 
pages: 1026323
[    0.000000] Policy zone: Normal
[    0.000000] Kernel command line: root=UUID=b2902faa-4872-4d3b-ae3a-
6284cbc63f12 ro earlyprintk=xen loglevel=8 console=hvc0
[    0.000000] PID hash table entries: 4096 (order: 3, 32768 bytes)
[    0.000000] invalid opcode: 0000 [#1] SMP 
[    0.000000] CPU 0 
[    0.000000] Modules linked in:
[    0.000000] 
[    0.000000] Pid: 0, comm: swapper Not tainted 3.2.0-23-generic #36-Ubuntu 
Dell Inc. Vostro 220 Series /0JJW8N
[    0.000000] RIP: e030:[<ffffffff8101d81c>]  [<ffffffff8101d81c>] 
xstate_enable+0x3c/0x50
[    0.000000] RSP: e02b:ffffffff81c01e58  EFLAGS: 00010046
[    0.000000] RAX: 0000000000000003 RBX: ffffffff81c01e94 RCX: 
0000000000000000
[    0.000000] RDX: 0000000000000000 RSI: 0000000000000003 RDI: 
0000000000002660
[    0.000000] RBP: ffffffff81c01e58 R08: ffffffff81c01e90 R09: 
ffffffff81c01e94
[    0.000000] R10: 00000000ffffffff R11: 00000000ffffffff R12: 
ffffffff81c01e90
[    0.000000] R13: ffffffff81c01e8c R14: ffffffff81c01e88 R15: 
ffff8800bfea7480
[    0.000000] FS:  0000000000000000(0000) GS:ffff8800bfe9b000(0000) 
knlGS:0000000000000000
[    0.000000] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
[    0.000000] CR2: 0000000000000000 CR3: 0000000001c05000 CR4: 
0000000000002660
[    0.000000] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
[    0.000000] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 
0000000000000400
[    0.000000] Process swapper (pid: 0, threadinfo ffffffff81c00000, task 
ffffffff81c0d020)
[    0.000000] Stack:
[    0.000000]  ffffffff81c01ec8 ffffffff81d0474c ffff8800bfea6150 
ffff8800bfea6950
[    0.000000]  ffff8800bfea6150 ffff8800bfea6950 0000024000000003 
0000000000000240
[    0.000000]  0000000000000004 0000000000000008 0000000000000004 
0000000000000000
[    0.000000] Call Trace:
[    0.000000]  [<ffffffff81d0474c>] xstate_enable_boot_cpu+0xa9/0x174
[    0.000000]  [<ffffffff81635a17>] xsave_init+0x26/0x28
[    0.000000]  [<ffffffff81637cdd>] cpu_init+0x2bb/0x2d8
[    0.000000]  [<ffffffff81d00f49>] trap_init+0x169/0x171
[    0.000000]  [<ffffffff81cfba28>] start_kernel+0x1d5/0x3c7
[    0.000000]  [<ffffffff81cfb388>] x86_64_start_reservations+0x132/0x136
[    0.000000]  [<ffffffff81cfef06>] xen_start_kernel+0x5bc/0x5c3
[    0.000000] Code: 00 04 00 ff 14 25 90 76 c1 81 48 89 c7 48 81 cf 00 00 
04 00 ff 14 25 98 76 c1 81 48 8b 05 dd 0d dc 00 31 c9 48 89 c2 48 c1 ea 20 
<0f> 01 d1 5d c3 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 55 
[    0.000000] RIP  [<ffffffff8101d81c>] xstate_enable+0x3c/0x50
[    0.000000]  RSP <ffffffff81c01e58>
[    0.000000] ---[ end trace a7919e7f17c0a725 ]---
[    0.000000] Kernel panic - not syncing: Attempted to kill the idle task!
[    0.000000] Pid: 0, comm: swapper Tainted: G      D      3.2.0-23-generic 
#36-Ubuntu
[    0.000000] Call Trace:
[    0.000000]  [<ffffffff81644023>] panic+0x91/0x1a4
[    0.000000]  [<ffffffff8106bcae>] do_exit+0x41e/0x420
[    0.000000]  [<ffffffff8165d620>] oops_end+0xb0/0xf0
[    0.000000]  [<ffffffff810168d8>] die+0x58/0x90
[    0.000000]  [<ffffffff8165cf94>] do_trap+0xc4/0x170
[    0.000000]  [<ffffffff81013f65>] do_invalid_op+0x95/0xb0
[    0.000000]  [<ffffffff8101d81c>] ? xstate_enable+0x3c/0x50
[    0.000000]  [<ffffffff8100aa82>] ? check_events+0x12/0x20
[    0.000000]  [<ffffffff8100b169>] ? get_phys_to_machine+0x9/0x70
[    0.000000]  [<ffffffff81006759>] ? pte_mfn_to_pfn+0x89/0xf0
[    0.000000]  [<ffffffff8100a29d>] ? xen_force_evtchn_callback+0xd/0x10
[    0.000000]  [<ffffffff81666a6b>] invalid_op+0x1b/0x20
[    0.000000]  [<ffffffff8101d81c>] ? xstate_enable+0x3c/0x50
[    0.000000]  [<ffffffff8101d80c>] ? xstate_enable+0x2c/0x50
[    0.000000]  [<ffffffff81d0474c>] xstate_enable_boot_cpu+0xa9/0x174
[    0.000000]  [<ffffffff81635a17>] xsave_init+0x26/0x28
[    0.000000]  [<ffffffff81637cdd>] cpu_init+0x2bb/0x2d8
[    0.000000]  [<ffffffff81d00f49>] trap_init+0x169/0x171
[    0.000000]  [<ffffffff81cfba28>] start_kernel+0x1d5/0x3c7
[    0.000000]  [<ffffffff81cfb388>] x86_64_start_reservations+0x132/0x136
[    0.000000]  [<ffffffff81cfef06>] xen_start_kernel+0x5bc/0x5c3
*** kdb (Fatal Error on cpu:0 vec:1  ????? ):
ffff82d080223a0f: kdb_trap_immed+3f              lea 0x6058e(%rip), %rdi 
[0]xkdb>







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