On Mon, 2005-09-19 at 16:51 +0100, Keir Fraser wrote:
> On 19 Sep 2005, at 15:28, Keir Fraser wrote:
>
> > Looks like the domU is looping early during boot. It would be helpful
> > to get a backtrace out, but currently our gdb server patches only work
> > for 32-bit non-pae. I'll look at fixing this and then get back to you
> > with instructions on how to harvest a useful backtrace from this domU.
>
> Okay, you need to pull the latest tree then follow the instructions in
> tools/debugger/gdb/README to build yourself a gdb server and to get a
> backtrace out of the hung domU.
>
> From within the gdb client session, run both 'bt' and 'disass' as
> recommended in the README file. Then cut & paste the result of the gdb
> client session into an email.
x335b:/tmp/xen-unstable.hg-PAE/tools/debugger/gdb/gdb-6.2.1-linux-i386-xen/gdb/gdbserver
# ./gdbserver-xen 127.0.0.1:9999 --attach 1
domain currently paused
Attached; pid = 1
Listening on port 9999
Remote debugging from host 127.0.0.1
x335b:~ # gdb /boot/vmlinux-syms-2.6.12-xenU
GNU gdb 6.3
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you
are
welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for
details.
This GDB was configured as "i586-suse-linux"...(no debugging symbols
found)
Using host libthread_db library "/lib/libthread_db.so.1".
(gdb) directory /tmp/xen-unstable.hg-PAE/linux-2.6.12
linux-2.6.12-xen0 linux-2.6.12-xenU linux-2.6.12.tar.bz2
(gdb) directory /tmp/xen-unstable.hg-PAE/linux-2.6.12-xenU
Source directories searched: /tmp/xen-unstable.hg-PAE/linux-2.6.12-xenU:
$cdir:$c wd
(gdb) target remote 127.0.0.1:9999
Remote debugging using 127.0.0.1:9999
0xc02523bd in xencons_ring_send ()
warning: shared library handler failed to enable breakpoint
(gdb) bt
#0 0xc02523bd in xencons_ring_send ()
#1 0xc124a7f8 in ?? ()
#2 0x00000001 in ?? ()
#3 0x00000004 in ?? ()
#4 0x00000002 in ?? ()
#5 0xcfd72000 in ?? ()
#6 0xc00a17c0 in ?? ()
#7 0xcfd72000 in ?? ()
#8 0xc014db95 in cache_grow ()
#9 0xc03f3c80 in ?? ()
#10 0xc00a17c0 in ?? ()
#11 0x00000001 in ?? ()
#12 0xc0251ca7 in __xencons_tx_flush ()
#13 0x00000001 in ?? ()
#14 0x000000d0 in ?? ()
#15 0x000007f9 in ?? ()
#16 0x00000001 in ?? ()
#17 0xc02518e5 in kcons_write ()
#18 0xc03279c0 in xencons_lock ()
#19 0x00000fc8 in ?? ()
#20 0x00000fc9 in ?? ()
#21 0x00000fc9 in ?? ()
#22 0xc012145b in __call_console_drivers ()
---Type <return> to continue, or q <return> to quit---
#23 0x00000fc9 in ?? ()
#24 0x00000fc9 in ?? ()
#25 0xffffffff in ?? ()
#26 0xc01215a3 in call_console_drivers ()
#27 0x36ffffff in ?? ()
#28 0x00000fc9 in ?? ()
#29 0x00000fc8 in ?? ()
#30 0x00000000 in ?? ()
#31 0xfffff037 in ?? ()
#32 0xc0121b11 in release_console_sem ()
#33 0x00000fc9 in ?? ()
#34 0x00000000 in ?? ()
#35 0x00000000 in ?? ()
#36 0xc0384581 in printk_buf.6 ()
#37 0x00000000 in ?? ()
#38 0xc0121955 in vprintk ()
#39 0x00000000 in ?? ()
#40 0x00000001 in ?? ()
#41 0x00000000 in ?? ()
#42 0x00000000 in ?? ()
#43 0xc031cba8 in cache_cache ()
#44 0xc031cbb0 in cache_cache ()
#45 0xc031cbe0 in cache_cache ()
---Type <return> to continue, or q <return> to quit---
#46 0xcfd71d80 in ?? ()
#47 0x00000030 in ?? ()
#48 0xcfd71dd8 in ?? ()
#49 0xcfd71d80 in ?? ()
#50 0xc014e7da in enable_cpucache ()
#51 0x00000078 in ?? ()
#52 0x0000003c in ?? ()
#53 0x00000008 in ?? ()
#54 0xc03036de in __func__.3 ()
#55 0xc014d3a8 in kmem_cache_create ()
#56 0xcfd71d80 in ?? ()
#57 0x00000000 in ?? ()
#58 0xc0327415 in iosched_deadline ()
#59 0x00000000 in ?? ()
#60 0xc0370928 in __initcall_as_init ()
#61 0xc0370928 in __initcall_as_init ()
#62 0x00000000 in ?? ()
#63 0xc0368b8b in deadline_init ()
#64 0x00000030 in ?? ()
#65 0x00000000 in ?? ()
#66 0x00000000 in ?? ()
#67 0x00000000 in ?? ()
#68 0x00000000 in ?? ()
---Type <return> to continue, or q <return> to quit---
#69 0xc12de000 in ?? ()
#70 0xc0356a85 in do_initcalls ()
#71 0x00000000 in ?? ()
#72 0xc0305184 in __func__.3 ()
#73 0xc0383b20 in cpu_core_id ()
#74 0x00000000 in ?? ()
#75 0x00000000 in ?? ()
#76 0x00000000 in ?? ()
#77 0xc0104115 in init ()
#78 0x00000004 in ?? ()
#79 0xc0104080 in run_init_process ()
#80 0xc0107585 in kernel_thread_helper ()
#81 0x00000000 in ?? ()
#82 0x00000000 in ?? ()
#83 0x00000000 in ?? ()
#84 0x00000000 in ?? ()
#85 0x00000000 in ?? ()
#86 0xc009a530 in ?? ()
#87 0xc03198e0 in ident_map ()
#88 0x00000000 in ?? ()
#89 0x00000000 in ?? ()
#90 0x00000001 in ?? ()
#91 0x00000000 in ?? ()
---Type <return> to continue, or q <return> to quit---
#92 0xffffffff in ?? ()
#93 0xc012f6b0 in sys_restart_syscall ()
#94 0x00000000 in ?? ()
#95 0x00000000 in ?? ()
#96 0x00000000 in ?? ()
#97 0x00000000 in ?? ()
#98 0x00000000 in ?? ()
#99 0x00000000 in ?? ()
#100 0x00000000 in ?? ()
#101 0x00000000 in ?? ()
#102 0x00000000 in ?? ()
#103 0x00000000 in ?? ()
#104 0x00000000 in ?? ()
#105 0x00000000 in ?? ()
#106 0x00000000 in ?? ()
#107 0x00000000 in ?? ()
#108 0x00000000 in ?? ()
#109 0x00000000 in ?? ()
#110 0x00000000 in ?? ()
#111 0x00000000 in ?? ()
#112 0x00000000 in ?? ()
#113 0x00000000 in ?? ()
#114 0x00000000 in ?? ()
---Type <return> to continue, or q <return> to quit---
#115 0x00000000 in ?? ()
#116 0x00000000 in ?? ()
#117 0x00000000 in ?? ()
#118 0x00000000 in ?? ()
#119 0x00000000 in ?? ()
#120 0x00000000 in ?? ()
#121 0x00000000 in ?? ()
#122 0x00000000 in ?? ()
#123 0x00000000 in ?? ()
#124 0x00000000 in ?? ()
#125 0x00000000 in ?? ()
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#127 0x00000000 in ?? ()
#128 0x00000000 in ?? ()
#129 0x00000000 in ?? ()
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#133 0x00000000 in ?? ()
#134 0x00000000 in ?? ()
#135 0x00000000 in ?? ()
#136 0x00000000 in ?? ()
#137 0x00000000 in ?? ()
---Type <return> to continue, or q <return> to quit---
#138 0x00000000 in ?? ()
#139 0x00000000 in ?? ()
#140 0x00000000 in ?? ()
#141 0x00000000 in ?? ()
#142 0x00000000 in ?? ()
#143 0x00000000 in ?? ()
#144 0x00000000 in ?? ()
#145 0x00000000 in ?? ()
#146 0x00000000 in ?? ()
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#156 0x00000000 in ?? ()
#157 0x00000000 in ?? ()
#158 0x00000000 in ?? ()
#159 0x00000000 in ?? ()
#160 0x00000000 in ?? ()
---Type <return> to continue, or q <return> to quit---
#161 0x00000000 in ?? ()
#162 0x00000000 in ?? ()
#163 0x00000000 in ?? ()
#164 0x00000000 in ?? ()
#165 0x00000000 in ?? ()
#166 0x00000000 in ?? ()
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#180 0x00000000 in ?? ()
#181 0x00000000 in ?? ()
#182 0x00000000 in ?? ()
#183 0x00000000 in ?? ()
---Type <return> to continue, or q <return> to quit---
#184 0x00000000 in ?? ()
#185 0x00000000 in ?? ()
#186 0x00000000 in ?? ()
#187 0x00000000 in ?? ()
#188 0x00000000 in ?? ()
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#203 0x00000000 in ?? ()
#204 0x00000000 in ?? ()
#205 0x00000000 in ?? ()
#206 0x00000000 in ?? ()
---Type <return> to continue, or q <return> to quit---
#207 0x00000000 in ?? ()
#208 0x00000000 in ?? ()
#209 0x00000000 in ?? ()
#210 0x00000000 in ?? ()
#211 0x00000000 in ?? ()
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#227 0x00000000 in ?? ()
#228 0x00000000 in ?? ()
#229 0x00000000 in ?? ()
---Type <return> to continue, or q <return> to quit---
#230 0x00000000 in ?? ()
#231 0x00000000 in ?? ()
#232 0x00000000 in ?? ()
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#234 0x00000000 in ?? ()
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#250 0x00000000 in ?? ()
#251 0x00000000 in ?? ()
#252 0x00000000 in ?? ()
---Type <return> to continue, or q <return> to quit---
#253 0x00000000 in ?? ()
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#273 0x00000000 in ?? ()
#274 0x00000000 in ?? ()
#275 0x00000000 in ?? ()
---Type <return> to continue, or q <return> to quit---
#276 0x00000000 in ?? ()
#277 0x00000000 in ?? ()
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#280 0x00000000 in ?? ()
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#297 0x00000000 in ?? ()
#298 0x00000000 in ?? ()
---Type <return> to continue, or q <return> to quit---
#299 0x00000000 in ?? ()
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#319 0x00000000 in ?? ()
#320 0x00000000 in ?? ()
#321 0x00000000 in ?? ()
---Type <return> to continue, or q <return> to quit---
#322 0x00000000 in ?? ()
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#324 0x00000000 in ?? ()
#325 0x00000000 in ?? ()
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#343 0x00000000 in ?? ()
#344 0x00000000 in ?? ()
---Type <return> to continue, or q <return> to quit---
#345 0x00000000 in ?? ()
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#347 0x00000000 in ?? ()
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#367 0x00000000 in ?? ()
---Type <return> to continue, or q <return> to quit---
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#389 0x00000000 in ?? ()
#390 0x00000000 in ?? ()
---Type <return> to continue, or q <return> to quit---
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#410 0x00000000 in ?? ()
#411 0x00000000 in ?? ()
#412 0x00000000 in ?? ()
#413 0x00000000 in ?? ()
---Type <return> to continue, or q <return> to quit---
#414 0x00000000 in ?? ()
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#435 0x00000000 in ?? ()
#436 0x00000000 in ?? ()
---Type <return> to continue, or q <return> to quit---
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#458 0x00000000 in ?? ()
#459 0x00000000 in ?? ()
---Type <return> to continue, or q <return> to quit---
#460 0x00000000 in ?? ()
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#480 0x00000000 in ?? ()
#481 0x00000000 in ?? ()
#482 0x00000000 in ?? ()
---Type <return> to continue, or q <return> to quit---
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#504 0x00000000 in ?? ()
#505 0x00000000 in ?? ()
---Type <return> to continue, or q <return> to quit---
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#527 0x00000000 in ?? ()
#528 0x00000000 in ?? ()
---Type <return> to continue, or q <return> to quit---
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#550 0x00000000 in ?? ()
#551 0x00000000 in ?? ()
---Type <return> to continue, or q <return> to quit---
#552 0x00000000 in ?? ()
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---Type <return> to continue, or q <return> to quit---
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---Type <return> to continue, or q <return> to quit---
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---Type <return> to continue, or q <return> to quit---
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---Type <return> to continue, or q <return> to quit---
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---Type <return> to continue, or q <return> to quit---
#667 0x00000000 in ?? ()
#668 0x00000000 in ?? ()
#669 0x00000000 in ?? ()
#670 0x00000000 in ?? ()
#671 0x00000000 in ?? ()
#672 0x00000000 in ?? ()
#673 0x00000000 in ?? ()
#674 0x00000000 in ?? ()
#675 0x00000000 in ?? ()
#676 0x00000000 in ?? ()
#677 0x00000000 in ?? ()
#678 0x00000000 in ?? ()
#679 0x00000000 in ?? ()
#680 0x00000000 in ?? ()
#681 0x00000000 in ?? ()
#682 0x00000000 in ?? ()
#683 0x00000000 in ?? ()
#684 0x00000000 in ?? ()
#685 0x00000000 in ?? ()
#686 0x00000000 in ?? ()
#687 0x00000000 in ?? ()
#688 0x00000000 in ?? ()
#689 0x00000000 in ?? ()
---Type <return> to continue, or q <return> to quit---
#690 0x00000000 in ?? ()
#691 0x00000000 in ?? ()
#692 0x00000000 in ?? ()
#693 0x00000000 in ?? ()
#694 0x00000000 in ?? ()
#695 0x00000000 in ?? ()
#696 0x00000000 in ?? ()
#697 0x00000000 in ?? ()
#698 0x00000000 in ?? ()
#699 0x00000000 in ?? ()
#700 0x00000000 in ?? ()
#701 0x00000000 in ?? ()
#702 0x00000000 in ?? ()
#703 0x00000000 in ?? ()
#704 0x00000000 in ?? ()
#705 0x00000000 in ?? ()
#706 0x00000000 in ?? ()
#707 0x00000000 in ?? ()
#708 0x00000000 in ?? ()
#709 0x00000000 in ?? ()
#710 0x00000000 in ?? ()
#711 0x00000000 in ?? ()
#712 0x00000000 in ?? ()
---Type <return> to continue, or q <return> to quit---q
Quit
(gdb) disass
Dump of assembler code for function xencons_ring_send:
0xc0252350 <xencons_ring_send+0>: push %ebx
0xc0252351 <xencons_ring_send+1>: sub $0x2c,%esp
0xc0252354 <xencons_ring_send+4>: xor %ebx,%ebx
0xc0252356 <xencons_ring_send+6>: mov 0xc0382ce4,%eax
0xc025235b <xencons_ring_send+11>: mov 0x14(%eax),%eax
0xc025235e <xencons_ring_send+14>: shl $0xc,%eax
0xc0252361 <xencons_ring_send+17>: mov %eax,%ecx
0xc0252363 <xencons_ring_send+19>: and $0xfff,%ecx
0xc0252369 <xencons_ring_send+25>: shrd $0xc,%ebx,%eax
0xc025236d <xencons_ring_send+29>: mov 0xf5800000(,%eax,4),%eax
0xc0252374 <xencons_ring_send+36>: shl $0xc,%eax
0xc0252377 <xencons_ring_send+39>: or %ecx,%eax
0xc0252379 <xencons_ring_send+41>: lea 0xc0000000(%eax),%edx
0xc025237f <xencons_ring_send+47>: mov %edx,(%esp)
0xc0252382 <xencons_ring_send+50>: mov 0x38(%esp),%eax
0xc0252386 <xencons_ring_send+54>: mov %eax,0x8(%esp)
0xc025238a <xencons_ring_send+58>: mov 0x34(%esp),%eax
0xc025238e <xencons_ring_send+62>: mov %eax,0x4(%esp)
0xc0252392 <xencons_ring_send+66>: call 0xc02522d0
<__xencons_ring_send>
0xc0252397 <xencons_ring_send+71>: mov 0xc0382ce4,%edx
0xc025239d <xencons_ring_send+77>: mov %eax,%ecx
0xc025239f <xencons_ring_send+79>: mov $0x4,%eax
---Type <return> to continue, or q <return> to quit---
0xc02523a4 <xencons_ring_send+84>: lea 0xc(%esp),%ebx
0xc02523a8 <xencons_ring_send+88>: movzwl 0x18(%edx),%edx
0xc02523ac <xencons_ring_send+92>: mov %eax,0xc(%esp)
0xc02523b0 <xencons_ring_send+96>: mov %edx,0x10(%esp)
0xc02523b4 <xencons_ring_send+100>: mov $0x10,%edx
0xc02523b9 <xencons_ring_send+105>: mov %edx,%eax
0xc02523bb <xencons_ring_send+107>: int $0x82
0xc02523bd <xencons_ring_send+109>: add $0x2c,%esp
0xc02523c0 <xencons_ring_send+112>: mov %ecx,%eax
0xc02523c2 <xencons_ring_send+114>: pop %ebx
0xc02523c3 <xencons_ring_send+115>: ret
0xc02523c4 <xencons_ring_send+116>: lea 0x0(%esi),%esi
0xc02523ca <xencons_ring_send+122>: lea 0x0(%edi),%edi
End of assembler dump.
(gdb)
>
> Keep the vmlinux-syms-2.6.12-xenU file hanging around. We may need that
> too, depending on what the backtrace tells us.
>
> -- Keir
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
>
--
Regards,
David F Barrera
Linux Technology Center
Systems and Technology Group, IBM
"The wisest men follow their own direction. "
Euripides
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