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SubjectConstant OOPSes with recent kernels
Hello. I am running an oldish Athlon (slot-type) 500MHz machine. I use
Debian (sid). I have been using AC kernels up to 2.4.13-ac7 without
problems. When moving to 2.4.15pre-something, and then now with
2.5.1pre1 I have oopses of various flavours very close to startup.

Because of lack of time I could not jot down the details. Yesterday
evening I was able to bring up a functioning user shell; then when
asking for a man page I got two OOPSes that were captured by klogd. I
was able to run ksymoops on them (right after the oops); here is what
I got:

--8<----8<----8<----8<----8<----8<----8<----8<----8<----8<----8<----8<--

ksymoops 2.3.7 on i686 2.5.1-pre1. Options used
-V (default)
-k /proc/ksyms (default)
-l /proc/modules (default)
-o /lib/modules/2.5.1-pre1/ (default)
-m /usr/src/linux/System.map (default)

Warning: You did not tell me where to find symbol information. I will
assume that the log matches the kernel and modules that are running
right now and I'll use the default options above for symbol resolution.
If the current kernel and/or modules do not match the log, you can get
more accurate output by telling me the kernel version and where to find
map, modules, ksyms etc. ksymoops -h explains the options.

Warning (compare_maps): mismatch on symbol scsi_CDs , sr_mod says d6893f64, /lib/modules/2.5.1-pre1/kernel/drivers/scsi/sr_mod.o says d6893e80. Ignoring /lib/modules/2.5.1-pre1/kernel/drivers/scsi/sr_mod.o entry
Warning (compare_maps): mismatch on symbol proc_scsi , scsi_mod says d688effc, /lib/modules/2.5.1-pre1/kernel/drivers/scsi/scsi_mod.o says d688d7d4. Ignoring /lib/modules/2.5.1-pre1/kernel/drivers/scsi/scsi_mod.o entry
Warning (compare_maps): mismatch on symbol scsi_devicelist , scsi_mod says d688f028, /lib/modules/2.5.1-pre1/kernel/drivers/scsi/scsi_mod.o says d688d800. Ignoring /lib/modules/2.5.1-pre1/kernel/drivers/scsi/scsi_mod.o entry
Warning (compare_maps): mismatch on symbol scsi_hostlist , scsi_mod says d688f024, /lib/modules/2.5.1-pre1/kernel/drivers/scsi/scsi_mod.o says d688d7fc. Ignoring /lib/modules/2.5.1-pre1/kernel/drivers/scsi/scsi_mod.o entry
Warning (compare_maps): mismatch on symbol scsi_hosts , scsi_mod says d688f02c, /lib/modules/2.5.1-pre1/kernel/drivers/scsi/scsi_mod.o says d688d804. Ignoring /lib/modules/2.5.1-pre1/kernel/drivers/scsi/scsi_mod.o entry
Warning (compare_maps): mismatch on symbol scsi_logging_level , scsi_mod says d688eff8, /lib/modules/2.5.1-pre1/kernel/drivers/scsi/scsi_mod.o says d688d7d0. Ignoring /lib/modules/2.5.1-pre1/kernel/drivers/scsi/scsi_mod.o entry
Warning (compare_maps): mismatch on symbol output_offset , ov511 says d6878760, /lib/modules/2.5.1-pre1/kernel/drivers/usb/ov511.o says d68780c0. Ignoring /lib/modules/2.5.1-pre1/kernel/drivers/usb/ov511.o entry
Warning (compare_maps): mismatch on symbol usb_devfs_handle , usbcore says d685b114, /lib/modules/2.5.1-pre1/kernel/drivers/usb/usbcore.o says d685ac34. Ignoring /lib/modules/2.5.1-pre1/kernel/drivers/usb/usbcore.o entry
invalid operand: 0000
CPU: 0
EIP: 0010:[<c0129421>] Tainted: P
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010206
eax: c119dcc0 ebx: c119dcc0 ecx: c119dcc0 edx: 00000000
esi: 00060000 edi: 00000000 ebp: 0849c000 esp: c6899ef8
ds: 0018 es: 0018 ss: 0018
Process troff (pid: 275, stackpage=c6899000)
Stack: c119dcc0 00060000 c6c143f0 0849c000 c0336888 c1040000 00000212 fffffffc
c0128735 c0129b2c c119dcc0 c0129f11 c119dcc0 c012006a c119dcc0 00079000
c0120470 06773067 c6a30640 d3e3e8c0 0809c000 00079000 c6c38084 c6c38084
Call Trace: [<c0128735>] [<c0129b2c>] [<c0129f11>] [<c012006a>] [<c0120470>]
[<c0122775>] [<c01129b9>] [<c0116986>] [<c0116b0e>] [<c0106c4b>]
Code: 0f 0b 8b 53 08 85 d2 74 02 0f 0b 89 d8 2b 05 6c fc 39 c0 c1

>>EIP; c0129421 <__free_pages_ok+11/1f0> <=====
Trace; c0128735 <lru_cache_del+5/10>
Trace; c0129b2c <page_cache_release+2c/30>
Trace; c0129f11 <free_page_and_swap_cache+31/40>
Trace; c012006a <__free_pte+3a/40>
Trace; c0120470 <zap_page_range+180/230>
Trace; c0122775 <exit_mmap+b5/110>
Trace; c01129b9 <mmput+39/60>
Trace; c0116986 <do_exit+86/1e0>
Trace; c0116b0e <sys_exit+e/10>
Trace; c0106c4b <system_call+33/38>
Code; c0129421 <__free_pages_ok+11/1f0>
00000000 <_EIP>:
Code; c0129421 <__free_pages_ok+11/1f0> <=====
0: 0f 0b ud2a <=====
Code; c0129423 <__free_pages_ok+13/1f0>
2: 8b 53 08 mov 0x8(%ebx),%edx
Code; c0129426 <__free_pages_ok+16/1f0>
5: 85 d2 test %edx,%edx
Code; c0129428 <__free_pages_ok+18/1f0>
7: 74 02 je b <_EIP+0xb> c012942c <__free_pages_ok+1c/1f0>
Code; c012942a <__free_pages_ok+1a/1f0>
9: 0f 0b ud2a
Code; c012942c <__free_pages_ok+1c/1f0>
b: 89 d8 mov %ebx,%eax
Code; c012942e <__free_pages_ok+1e/1f0>
d: 2b 05 6c fc 39 c0 sub 0xc039fc6c,%eax
Code; c0129434 <__free_pages_ok+24/1f0>
13: c1 00 00 roll $0x0,(%eax)

invalid operand: 0000
CPU: 0
EIP: 0010:[<c0129421>] Tainted: P
EFLAGS: 00010206
eax: c119d180 ebx: c119d180 ecx: c119d180 edx: 00000000
esi: 00011000 edi: 00000000 ebp: 08457000 esp: c6895e60
ds: 0018 es: 0018 ss: 0018
Process grotty (pid: 276, stackpage=c6895000)
Stack: c119d180 00011000 c68921a0 08457000 c0336888 c1040000 00000217 ffffffff
c0128735 c0129b2c c119d180 c0129f11 c119d180 c012006a c119d180 00027000
c0120470 06746067 c6a300c0 d3e3e980 08057000 00027000 c6893084 c6893084
Call Trace: [<c0128735>] [<c0129b2c>] [<c0129f11>] [<c012006a>] [<c0120470>]
[<c0122775>] [<c01129b9>] [<c0116986>] [<c0106af8>] [<c0135b9c>] [<c012e2d3>]
[<c0106c84>]
Code: 0f 0b 8b 53 08 85 d2 74 02 0f 0b 89 d8 2b 05 6c fc 39 c0 c1

>>EIP; c0129421 <__free_pages_ok+11/1f0> <=====
Trace; c0128735 <lru_cache_del+5/10>
Trace; c0129b2c <page_cache_release+2c/30>
Trace; c0129f11 <free_page_and_swap_cache+31/40>
Trace; c012006a <__free_pte+3a/40>
Trace; c0120470 <zap_page_range+180/230>
Trace; c0122775 <exit_mmap+b5/110>
Trace; c01129b9 <mmput+39/60>
Trace; c0116986 <do_exit+86/1e0>
Trace; c0106af8 <do_signal+228/290>
Trace; c0135b9c <pipe_write+25c/270>
Trace; c012e2d3 <sys_write+c3/d0>
Trace; c0106c84 <signal_return+14/18>
Code; c0129421 <__free_pages_ok+11/1f0>
00000000 <_EIP>:
Code; c0129421 <__free_pages_ok+11/1f0> <=====
0: 0f 0b ud2a <=====
Code; c0129423 <__free_pages_ok+13/1f0>
2: 8b 53 08 mov 0x8(%ebx),%edx
Code; c0129426 <__free_pages_ok+16/1f0>
5: 85 d2 test %edx,%edx
Code; c0129428 <__free_pages_ok+18/1f0>
7: 74 02 je b <_EIP+0xb> c012942c <__free_pages_ok+1c/1f0>
Code; c012942a <__free_pages_ok+1a/1f0>
9: 0f 0b ud2a
Code; c012942c <__free_pages_ok+1c/1f0>
b: 89 d8 mov %ebx,%eax
Code; c012942e <__free_pages_ok+1e/1f0>
d: 2b 05 6c fc 39 c0 sub 0xc039fc6c,%eax
Code; c0129434 <__free_pages_ok+24/1f0>
13: c1 00 00 roll $0x0,(%eax)


9 warnings issued. Results may not be reliable.

--8<----8<----8<----8<----8<----8<----8<----8<----8<----8<----8<----8<--

I cannot understand the reason for the warnings: System.map was the
right file, and ksymoops was run on the same kernel that produced the
OOPS itself.

I saw other reports of OOPSes caused in this __free_pages_ok function,
but it seems each was cured individually.

The strange thing is that after the above OOPS messages, I could then
ask for other manpages without problems.

Let me know if I can provide more info. I am now safely back to
2.4.13ac7

Carlo

--
* Se la Strada e la sua Virtu' non fossero state messe da parte,
* K * Carlo E. Prelz - fluido@fluido.as che bisogno ci sarebbe
* di parlare tanto di amore e di rettitudine? (Chuang-Tzu)
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