test12-pre3: paging problem

DISCUSSION Tim Sullivan 2 participants 4 messages Nov 29, 2000

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Tim Sullivan

author

2000-11-29 14:46 UTC #0 lore raw

Hello,

The following occurred during startup using test12-pre3. test12-pre2 does not exhibit the problem.

regards,

-tim

kernel: Unable to handle kernel paging request at virtual address fffffffc
kernel: printing eip:
kernel: c011a41f
kernel: *pde = 00001063
kernel: *pte = 00000000
kernel: Oops: 0000
kernel: CPU: 0
kernel: EIP: 0010:[sys_setitimer+191/208]
kernel: EFLAGS: 00010246
kernel: eax: 00000000 ebx: cf4e1fb0 ecx: 00000000 edx: c027169d
kernel: esi: bffffc68 edi: cf4e1fc0 ebp: 00000000 esp: cf4e1f88
kernel: ds: 0018 es: 0018 ss: 0018
kernel: Process ntpdate (pid: 451, stackpage=cf4e1000)
kernel: Stack: cf4e0000 bffffd1c 00000009 bffffc70 00000000 cf4e0000 400538e8 00000000
kernel: 00000000 40166214 00000000 00030d40 00000000 000186a0
c010a847 00000000
kernel: bffffc58 00000000 bffffd1c 00000009 bffffc70 00000068
0000002b 0000002b
kernel: Call Trace: [system_call+51/56]
kernel: Code: c8 5d 83 c4 28 c3 90 90 90 90 90 90 90 90 90 90 90 83 ec 44

kernel: Unable to handle kernel paging request at virtual address fffffffc
kernel: printing eip:
kernel: c011a41f
kernel: *pde = 00001063
kernel: *pte = 00000000
kernel: Oops: 0000
kernel: CPU: 0
kernel: EIP: 0010:[sys_setitimer+191/208]
kernel: EFLAGS: 00010246
kernel: eax: 00000000 ebx: cf301fb0 ecx: 00000000 edx: c027139d
kernel: esi: bffffc28 edi: cf301fc0 ebp: 00000000 esp: cf301f88
kernel: ds: 0018 es: 0018 ss: 0018
kernel: Process ntpd (pid: 460, stackpage=cf301000)
kernel: Stack: cf300000 bffffd6c 00000002 bffffc30 00000000 cf300000 400538e8 00000000
kernel: 00000000 40185214 00000001 00000000 00000001 00000000
c010a847 00000000
kernel: bffffc18 00000000 bffffd6c 00000002 bffffc30 00000068
0000002b 0000002b
kernel: Call Trace: [system_call+51/56]
kernel: Code: c8 5d 83 c4 28 c3 90 90 90 90 90 90 90 90 90 90 90 83 ec 44

kernel: Unable to handle kernel paging request at virtual address fffffffc
kernel: printing eip:
kernel: c011a41f
kernel: *pde = 00001063
kernel: *pte = 00000000
kernel: Oops: 0000
kernel: CPU: 0
kernel: EIP: 0010:[sys_setitimer+191/208]
kernel: EFLAGS: 00010246
kernel: eax: 00000000 ebx: cdc65fb0 ecx: 00000000 edx: c027169d
kernel: esi: bfffe8d8 edi: cdc65fc0 ebp: 00000000 esp: cdc65f88
kernel: ds: 0018 es: 0018 ss: 0018
kernel: Process X (pid: 853, stackpage=cdc65000)
kernel: Stack: cdc64000 bfffe8f8 00000000 bfffe8e0 cfae5000 cdc64000 000fae50 c012cd2c
kernel: c1447d40 080d78b0 00000000 00004e20 00000000 00004e20
c010a847 00000000
kernel: bfffe8c8 00000000 bfffe8f8 00000000 bfffe8e0 00000068
0000002b 0000002b
kernel: Call Trace: [sys_open+136/180] [system_call+51/56]
kernel: Code: c8 5d 83 c4 28 c3 90 90 90 90 90 90 90 90 90 90 90 83 ec 44
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Tim Sullivan

author

2000-11-29 15:57 UTC #1 lore raw

Quoted 4 lines · Brian Gerst

Run the oops messages through ksymoops please. It is useless in this form.

In this case, it is not very helpful.

ksymoops 2.3.5 on i686 2.4.0-test12-pre3. Options used
-v /usr/src/linux/vmlinux (specified)
-k /proc/ksyms (specified)
-l /proc/modules (default)
-o /lib/modules/2.4.0-test12-pre3/ (default) -m /usr/src/linux/System.map (default)

kernel: Unable to handle kernel paging request at virtual address fffffffc
kernel: Unable to handle kernel paging request at virtual address fffffffc
kernel: Unable to handle kernel paging request at virtual address fffffffc

regards,

-tim
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Brian Gerst

2000-11-29 16:15 UTC #2 lore raw

In reply to Tim Sullivan

Quoted 25 lines · Tim Sullivan

Hello,
The following occurred during startup using test12-pre3. test12-pre2 does not exhibit the problem.
regards,
-tim
kernel: Unable to handle kernel paging request at virtual address fffffffc
kernel: printing eip:
kernel: c011a41f
kernel: *pde = 00001063
kernel: *pte = 00000000
kernel: Oops: 0000
kernel: CPU: 0
kernel: EIP: 0010:[sys_setitimer+191/208]
kernel: EFLAGS: 00010246
kernel: eax: 00000000 ebx: cf4e1fb0 ecx: 00000000 edx: c027169d
kernel: esi: bffffc68 edi: cf4e1fc0 ebp: 00000000 esp: cf4e1f88
kernel: ds: 0018 es: 0018 ss: 0018
kernel: Process ntpdate (pid: 451, stackpage=cf4e1000)
kernel: Stack: cf4e0000 bffffd1c 00000009 bffffc70 00000000 cf4e0000

Quoted 8 lines

400538e8 00000000
kernel: 00000000 40166214 00000000 00030d40 00000000 000186a0
c010a847 00000000
kernel: bffffc58 00000000 bffffd1c 00000009 bffffc70 00000068
0000002b 0000002b
kernel: Call Trace: [system_call+51/56]
kernel: Code: c8 5d 83 c4 28 c3 90 90 90 90 90 90 90 90 90 90 90 83 ec 44

Disassemblind the code bytes, it shows up as:

   0:   c8 5d 83 c4             enter  $0x835d,$0xc4
   4:   28 c3                   subb   %al,%bl
   6:   90                      nop
which is definately wrong.  Moving one byte forward it becomes:
   0:   5d                      popl   %ebp
   1:   83 c4 28                addl   $0x28,%esp
   4:   c3                      ret
   5:   90                      nop

which a normal sequence of instructions for the end of a function. It looks like a branch may have been miscompiled off by one. What compiler/binutils are you using?

Brian Gerst
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Tim Sullivan

author

2000-11-29 17:08 UTC #3 lore raw

In reply to Tim Sullivan

Quoted 45 lines · Brian Gerst

Quoted 25 lines · Tim Sullivan
Hello,
The following occurred during startup using test12-pre3. test12-pre2 does not exhibit the problem.
regards,
-tim
kernel: Unable to handle kernel paging request at virtual address fffffffc
kernel: printing eip:
kernel: c011a41f
kernel: *pde = 00001063
kernel: *pte = 00000000
kernel: Oops: 0000
kernel: CPU: 0
kernel: EIP: 0010:[sys_setitimer+191/208]
kernel: EFLAGS: 00010246
kernel: eax: 00000000 ebx: cf4e1fb0 ecx: 00000000 edx: c027169d
kernel: esi: bffffc68 edi: cf4e1fc0 ebp: 00000000 esp: cf4e1f88
kernel: ds: 0018 es: 0018 ss: 0018
kernel: Process ntpdate (pid: 451, stackpage=cf4e1000)
kernel: Stack: cf4e0000 bffffd1c 00000009 bffffc70 00000000 cf4e0000
Quoted 8 lines
400538e8 00000000
kernel: 00000000 40166214 00000000 00030d40 00000000 000186a0
c010a847 00000000
kernel: bffffc58 00000000 bffffd1c 00000009 bffffc70 00000068
0000002b 0000002b
kernel: Call Trace: [system_call+51/56]
kernel: Code: c8 5d 83 c4 28 c3 90 90 90 90 90 90 90 90 90 90 90 83 ec 44
Disassemblind the code bytes, it shows up as:
   0:   c8 5d 83 c4             enter  $0x835d,$0xc4
   4:   28 c3                   subb   %al,%bl
   6:   90                      nop
which is definately wrong.  Moving one byte forward it becomes:
   0:   5d                      popl   %ebp
   1:   83 c4 28                addl   $0x28,%esp
   4:   c3                      ret
   5:   90                      nop

Quoted 7 lines

which a normal sequence of instructions for the end of a function. It looks like a branch may have been miscompiled off by one. What compiler/binutils are you using?
--
Brian Gerst

compiler = kgcc (RedHat 7)

	gcc version egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)

binutils = 2.10.0.18

-tim
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