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lost ticks in linux

DISCUSSION Emil Tantilov 2 participants 4 messages Dec 21, 2006 3 messages not in the archive KVM

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Emil Tantilov

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#0 lore raw

Also getting the following panic on init 6:

Restarting system.
divide error: 0000 [#1]
SMP

Modules linked in: ne2k_pci 8390
CPU:    0
EIP:    0060:[<c022d884>]    Not tainted VLI
EFLAGS: 00000297   (2.6.19 #11)

EIP is at delay_tsc+0x14/0x20
eax: c6b4fe16 ebx: 0003aa4d ecx: c6b41dc1 edx:
0000002a
esi: 01234567 edi: b7f8eff4 ebp: df8a8000 esp:
df8a9e8c
ds: 007b es: 007b ss: 0068
Process reboot (pid: 4563, ti=df8a8000 task=c16c6070 task.ti=df8a8000)

Stack: 00000004 c010cfc4 0003aa4d b7f8eff4 28121969
c012aa73 00000000 ffffffff
       ffffffff 00000000 c170f70c 00000000 c170f70c
c01472a3 c170f710 000000b6
       c102f300 c014a086 c170f70c 000000b6 c018c693
dfe25b28 dfa64e3c dfa08888
Call Trace:
 [<c010cfc4>] machine_emergency_restart+0x84/0x100
 [<c012aa73>] sys_reboot+0x183/0x1a0
 [<c01472a3>] find_get_page+0x23/0x50
 [<c014a086>] filemap_nopage+0x336/0x3d0
 [<c018c693>] invalidate_inode_buffers+0x13/0xc0
 [<c01552ac>] __handle_mm_fault+0x54c/0x980
 [<c02fb88b>] sock_destroy_inode+0x1b/0x20
 [<c0179b48>] dentry_iput+0x68/0xc0
 [<c02288df>] _atomic_dec_and_lock+0x3f/0x70
 [<c01142c3>] do_page_fault+0x533/0x690
 [<c0103115>] sysenter_past_esp+0x56/0x79
 =======================
Code: 8d bc 27 00 00 00 00 48 79 fd c3 8d b6 00 00 00

00 8d bf 00 00 00 00 53 8b 5c 24 08 0f 31 89 c1 8d b4 26 00 00 00 00 f3 90 0f 31 <29> c8 39 d8 72 f6 5b c3 8d 74 26 00 b8 70 d8 22 c0 a3 28 0e 3e
EIP: [<c022d884>] delay_tsc+0x14/0x20 SS:ESP 0068:df8a9e8c

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#2 lore raw
Quoted 3 lines · Emil Tantilov

Also getting the following panic on init 6:

I presume (from the module list) that this is on the guest, right?

Guest shutdown/restart is not a well supported area at the moment.

Quoted 5 lines

Restarting system.
divide error: 0000 [#1]
SMP

Modules linked in: ne2k_pci 8390
Signature · 8 lines
error compiling committee.c: too many arguments to function


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author
#4 lore raw

Yep - that is corect. init 0 works OK, but init 6
panics.

EIP points to delay_tsc, so I think it might be
related to the issue with the clock (TSC running
slow).

Emil

Quoted 12 lines · --- Avi Kivity
Quoted 3 lines · Emil Tantilov

Also getting the following panic on init 6:

I presume (from the module list) that this is on the guest, right?

Guest shutdown/restart is not a well supported area at the moment.

Quoted 11 lines
Quoted 5 lines

Restarting system.
divide error: 0000 [#1]
SMP

Modules linked in: ne2k_pci 8390
Signature · 2 lines
error compiling committee.c: too many arguments to
function

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#6 lore raw
Quoted 8 lines · Emil Tantilov

Yep - that is corect. init 0 works OK, but init 6
panics.

EIP points to delay_tsc, so I think it might be
related to the issue with the clock (TSC running
slow).

Well, the EIP points at a sub instruction, which has no business generating divide exceptions.

b: 8d b6 00 00 00 00 lea 0x0(%esi),%esi

  11:   8d bf 00 00 00 00       lea    0x0(%edi),%edi
  17:   53                      push   %ebx
  18:   8b 5c 24 08             mov    0x8(%esp),%ebx
  1c:   0f 31                   rdtsc
  1e:   89 c1                   mov    %eax,%ecx
  20:   8d b4 26 00 00 00 00    lea    0x0(%esi),%esi
  27:   f3 90                   pause
  29:   0f 31                   rdtsc
exception here -->
  2b:   29 c8                   sub    %ecx,%eax
  2d:   39 d8                   cmp    %ebx,%eax
  2f:   72 f6                   jb     0x27
  31:   5b                      pop    %ebx
  32:   c3                      ret
Signature · 8 lines
error compiling committee.c: too many arguments to function


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