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SubjectOops trace of 2.2.9-ac2 lockups
After considerable grief, I got serial console output working and captured
two of the lockups.

These are 100% repeatable, and I'll be delighted to test any potential
fixes.

Once again, I'm only seeing these with 2.2.7-ac4 and 2.2.9-ac2. Vanilla
2.2.9 works fine, as does 2.2.7-ac2 - if that helps narrow things..

Steve



Options used: -v /usr/src/linux/vmlinux (specified)
-o /lib/modules/2.2.9-ac2 (specified)
-K (specified)
-L (specified)
-m /usr/src/linux/System.map (default)
-c 1 (default)
-a - same as ksymoops (default)

No modules in ksyms, skipping objects
Unable to handle kernel NULL pointer dereference at virtual address 0000070c
current->tss.cr3 = 07f1f000, %cr3 = 07f1f000
*pde = 00000000
Oops: 0002
CPU: 1
EIP: 0010:[<c012c033>]
EFLAGS: 00010006
eax: 00000001 ebx: 00003871 ecx: ffffffff edx: 00000000
esi: 000070e2 edi: c0247760 ebp: c726dfa0 esp: c726df94
ds: 0018 es: 0018 ss: 0018
Process mc (pid: 455, process nr: 5, stackpage=c726d000)
Stack: c70e2000 ffffffff 00000206 c726dfbc c012eeeb c70e2000 00000000 c726c000
00000004 080d2de0 bffffba8 c010aaf1 080d2de0 00000241 000001b6 00000004
080d2de0 bffffba8 00000005 c010002b 0000002b 00000005 4010b664 00000023
Call Trace: [<c012eeeb>] [<c010aaf1>] [<c010002b>]
Code: f0 0f bb 1a 19 c0 85 c0 74 33 8b 45 f8 f7 d8 31 f0 8d 04 80
Copying default arch from ksymoops, bfd_arch=8 bfd_mach=0

>>EIP; c012c033 <free_pages+b7/124>
Trace; c012eeeb <sys_open+8b/bc>
Trace; c010aaf1 <system_call+3d/44>
Trace; c010002b <startup_32+2b/a4>
Code; c012c033 <free_pages+b7/124> 00000000 <_EIP>:
Code; c012c033 <free_pages+b7/124> 0: f0 0f bb 1a lock btcl %ebx,(%edx)
Code; c012c037 <free_pages+bb/124> 4: 19 c0 sbbl %eax,%eax
Code; c012c039 <free_pages+bd/124> 6: 85 c0 testl %eax,%eax
Code; c012c03b <free_pages+bf/124> 8: 74 33 je 3d <_EIP+0x3d> c012c070 <free_pages+f4/124>
Code; c012c03d <free_pages+c1/124> a: 8b 45 f8 movl 0xfffffff8(%ebp),%eax
Code; c012c040 <free_pages+c4/124> d: f7 d8 negl %eax
Code; c012c042 <free_pages+c6/124> f: 31 f0 xorl %esi,%eax
Code; c012c044 <free_pages+c8/124> 11: 8d 04 80 leal (%eax,%eax,4),%eax



and


Options used: -v /usr/src/linux/vmlinux (specified)
-o /lib/modules/2.2.9-ac2 (specified)
-K (specified)
-L (specified)
-m /usr/src/linux/System.map (default)
-c 1 (default)
-a - same as ksymoops (default)

No modules in ksyms, skipping objects
Unable to handle kernel NULL pointer dereference at virtual address 00000098
current->tss.cr3 = 07aa3000, %cr3 = 07aa3000
*pde = 00000000
Oops: 0002
CPU: 1
EIP: 0010:[<c012c033>]
EFLAGS: 00010006
eax: 00000001 ebx: 000004d5 ecx: ffffffff edx: 00000000
esi: 000009ab edi: c0247760 ebp: c0ccdf98 esp: c0ccdf8c
ds: 0018 es: 0018 ss: 0018
Process xdm (pid: 470, process nr: 41, stackpage=c0ccd000)
Stack: c0b0b2c0 ffffffff 00000203 c0ccdfbc c0137cb4 c09ab000 00000000 c0ccc000
bffff468 00000000 c0ccc000 c09ab000 bffff868 c010aaf1 bfffec68 bffff468
bfffec68 bffff468 00000000 bffff868 0000000a 0000002b 0000002b 0000000a
Call Trace: [<c0137cb4>] [<c010aaf1>]
Code: f0 0f bb 1a 19 c0 85 c0 74 33 8b 45 f8 f7 d8 31 f0 8d 04 80
Copying default arch from ksymoops, bfd_arch=8 bfd_mach=0

>>EIP; c012c033 <free_pages+b7/124>
Trace; c0137cb4 <sys_unlink+d0/f0>
Trace; c010aaf1 <system_call+3d/44>
Code; c012c033 <free_pages+b7/124> 00000000 <_EIP>:
Code; c012c033 <free_pages+b7/124> 0: f0 0f bb 1a lock btcl %ebx,(%edx)
Code; c012c037 <free_pages+bb/124> 4: 19 c0 sbbl %eax,%eax
Code; c012c039 <free_pages+bd/124> 6: 85 c0 testl %eax,%eax
Code; c012c03b <free_pages+bf/124> 8: 74 33 je 3d <_EIP+0x3d> c012c070 <free_pages+f4/124>
Code; c012c03d <free_pages+c1/124> a: 8b 45 f8 movl 0xfffffff8(%ebp),%eax
Code; c012c040 <free_pages+c4/124> d: f7 d8 negl %eax
Code; c012c042 <free_pages+c6/124> f: 31 f0 xorl %esi,%eax
Code; c012c044 <free_pages+c8/124> 11: 8d 04 80 leal (%eax,%eax,4),%eax



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