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Subject2.6.2-rc1-mm1 oops with X
From
I am getting the oops pasted below.  It only happens when the X server
is restarting. I do not see it all of the time but frequently enough
that I can call it reproducible. I started seeing it with 2.6.1-mm4 and
can trigger it fairly regularly with 2.6.2-rc1-mm1. However, I do not
see it with 2.6.1-mm3 nor with 2.6.2-rc1. Hopefully, that narrows the
field as to what may be the culprit.

Some relevant hardware and kernel configuration information:

- 2.4GHz P4c with HyperThreading (I do have CONFIG_SMT set)
- Radeon 9100 graphics card (DRI enabled)

---begin oops---
Unable to handle kernel NULL pointer dereference at virtual address 00000000
printing eip:
c02a2c56
*pde = 00000000
Oops: 0000 [#1]
PREEMPT SMP
CPU: 0
EIP: 0060:[<c02a2c56>] Not tainted VLI
EFLAGS: 00010286
EIP is at vt_ioctl+0x1e/0x1f4b
eax: 00000000 ebx: daf10000 ecx: 00000007 edx: 00000007
esi: 00005607 edi: daf10000 ebp: daf48080 esp: dc6d7ea0
ds: 007b es: 007b ss: 0068
Process X (pid: 6100, threadinfo=dc6d6000 task=dbe56d00)
Stack: 00000006 df8e6005 00000003 df8e6005 dc6d7f70 dffd8f00 00000000 dfda1480
df963b00 c01746e1 dfda1480 c0526e80 00000000 dfbaf780 df963b00 c016b982
00021480 00000000 00000000 00000001 df4f9200 c01668e6 c0579800 daf48280
Call Trace:
[<c01746e1>] dput+0x22/0x2b1
[<c016b982>] link_path_walk+0x690/0x9ea
[<c01668e6>] cdev_put+0x17/0x69
[<c0166503>] chrdev_open+0x160/0x291
[<c011dfaa>] recalc_task_prio+0x90/0x1aa
[<c012082d>] schedule+0x39b/0x6d7
[<c02a2c38>] vt_ioctl+0x0/0x1f4b
[<c029d8dd>] tty_ioctl+0x472/0x570
[<c016fb3a>] sys_ioctl+0x119/0x2a3
[<c041b3da>] sysenter_past_esp+0x43/0x65

Code: ff e8 5f 77 e6 ff e9 6d ff ff ff 90 90 55 57 56 53 81 ec b8 00 00 00 8b bc 24 cc 00 00 00 8b b4 24 d4 00 00 00 8b 87 78 09 00 00 <8b> 18 8b 04 9d 00 9e 57 c0 89 1c 24 89 44 24 50 e8 4e 6a 00 00
<1>Unable to handle kernel NULL pointer dereference at virtual address 00000000
printing eip:
c02a2c56
*pde = 00000000
Oops: 0000 [#2]
PREEMPT SMP
CPU: 0
EIP: 0060:[<c02a2c56>] Not tainted VLI
EFLAGS: 00010286
EIP is at vt_ioctl+0x1e/0x1f4b
eax: 00000000 ebx: d1ec7000 ecx: 00000008 edx: 00000008
esi: 00005607 edi: d1ec7000 ebp: daf48180 esp: d0927ea0
ds: 007b es: 007b ss: 0068
Process X (pid: 6117, threadinfo=d0926000 task=dbe56080)
Stack: 00000007 df9df005 00000003 df9df005 d0927f70 dffd8f00 00000000 dfda1480
df963b00 c01746e1 dfda1480 c0526e80 00000000 dfbaf780 df963b00 c016b982
00021480 00000000 00000000 00000001 dee34a00 c01668e6 c0579800 daeab180
Call Trace:
[<c01746e1>] dput+0x22/0x2b1
[<c016b982>] link_path_walk+0x690/0x9ea
[<c01668e6>] cdev_put+0x17/0x69
[<c0166503>] chrdev_open+0x160/0x291
[<c011dfaa>] recalc_task_prio+0x90/0x1aa
[<c012082d>] schedule+0x39b/0x6d7
[<c02a2c38>] vt_ioctl+0x0/0x1f4b
[<c029d8dd>] tty_ioctl+0x472/0x570
[<c016fb3a>] sys_ioctl+0x119/0x2a3
[<c041b3da>] sysenter_past_esp+0x43/0x65

Code: ff e8 5f 77 e6 ff e9 6d ff ff ff 90 90 55 57 56 53 81 ec b8 00 00 00 8b bc 24 cc 00 00 00 8b b4 24 d4 00 00 00 8b 87 78 09 00 00 <8b> 18 8b 04 9d 00 9e 57 c0 89 1c 24 89 44 24 50 e8 4e 6a 00 00
<1>Unable to handle kernel NULL pointer dereference at virtual address 00000000
printing eip:
c02a2c56
*pde = 00000000
Oops: 0000 [#3]
PREEMPT SMP
CPU: 0
EIP: 0060:[<c02a2c56>] Not tainted VLI
EFLAGS: 00010286
EIP is at vt_ioctl+0x1e/0x1f4b
eax: 00000000 ebx: d1ec6000 ecx: 00000009 edx: 00000009
esi: 00005607 edi: d1ec6000 ebp: ce675380 esp: cd0f9ea0
ds: 007b es: 007b ss: 0068
Process X (pid: 6134, threadinfo=cd0f8000 task=df4c8d00)
Stack: 00000008 c1738005 00000003 c1738005 cd0f9f70 dffd8f00 00000000 dfda1480
df963b00 c01746e1 dfda1480 c0526e80 00000000 dfbaf780 df963b00 c016b982
00021480 00000000 00000000 00000001 dee34800 c01668e6 c0579800 cd177e80
Call Trace:
[<c01746e1>] dput+0x22/0x2b1
[<c016b982>] link_path_walk+0x690/0x9ea
[<c01668e6>] cdev_put+0x17/0x69
[<c0166503>] chrdev_open+0x160/0x291
[<c011dfaa>] recalc_task_prio+0x90/0x1aa
[<c012082d>] schedule+0x39b/0x6d7
[<c02a2c38>] vt_ioctl+0x0/0x1f4b
[<c029d8dd>] tty_ioctl+0x472/0x570
[<c016fb3a>] sys_ioctl+0x119/0x2a3
[<c041b3da>] sysenter_past_esp+0x43/0x65

Code: ff e8 5f 77 e6 ff e9 6d ff ff ff 90 90 55 57 56 53 81 ec b8 00 00 00 8b bc 24 cc 00 00 00 8b b4 24 d4 00 00 00 8b 87 78 09 00 00 <8b> 18 8b 04 9d 00 9e 57 c0 89 1c 24 89 44 24 50 e8 4e 6a 00 00
<1>Unable to handle kernel NULL pointer dereference at virtual address 00000000
printing eip:
c02a2c56
*pde = 00000000
Oops: 0000 [#4]
PREEMPT SMP
CPU: 1
EIP: 0060:[<c02a2c56>] Not tainted VLI
EFLAGS: 00010286
EIP is at vt_ioctl+0x1e/0x1f4b
eax: 00000000 ebx: c7f3a000 ecx: 0000000a edx: 0000000a
esi: 00005607 edi: c7f3a000 ebp: d089a980 esp: cd0f9ea0
ds: 007b es: 007b ss: 0068
Process X (pid: 6151, threadinfo=cd0f8000 task=df4c8d00)
Stack: 00000009 df069005 00000003 df069005 cd0f9f70 dffd8f00 00000000 dfda1480
df963b00 c01746e1 dfda1480 c0526e80 00000000 dfbaf780 df963b00 c016b982
00021480 00000000 00000000 00000001 df4f9000 c01668e6 c0579800 daeab180
Call Trace:
[<c01746e1>] dput+0x22/0x2b1
[<c016b982>] link_path_walk+0x690/0x9ea
[<c01668e6>] cdev_put+0x17/0x69
[<c0166503>] chrdev_open+0x160/0x291
[<c011dfaa>] recalc_task_prio+0x90/0x1aa
[<c012082d>] schedule+0x39b/0x6d7
[<c02a2c38>] vt_ioctl+0x0/0x1f4b
[<c029d8dd>] tty_ioctl+0x472/0x570
[<c016fb3a>] sys_ioctl+0x119/0x2a3
[<c041b3da>] sysenter_past_esp+0x43/0x65

Code: ff e8 5f 77 e6 ff e9 6d ff ff ff 90 90 55 57 56 53 81 ec b8 00 00 00 8b bc 24 cc 00 00 00 8b b4 24 d4 00 00 00 8b 87 78 09 00 00 <8b> 18 8b 04 9d 00 9e 57 c0 89 1c 24 89 44 24 50 e8 4e 6a 00 00
---end oops---

Regards,

Glenn
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