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SubjectBug while executing : cat /proc/iomem on 2.6.17-rc1/rc2
I found this following problem while executing cat/proc/iomem. The 
command causes following BUG.

x236:/linux-2.6.17-rc1/fs # cat /proc/iomem
Segmentation fault
x236:/linux-2.6.17-rc1/fs #

Dmesg has this following stack trace.

Same problem with 2.6.17-rc2. But not with 2.6.16-rc6 [ some old
precompiled 2.6.16 kernel i had on my machine ]. cat on /proc/ioports
also causes similar BUG.

Attaching the dmesg log for reference. Arch is IA32.

BUG: unable to handle kernel NULL pointer dereference at virtual address
00000010
printing eip:
c011cdef
*pde = 00000000
Oops: 0000 [#1]
Modules linked in:
CPU: 0
EIP: 0060:[<c011cdef>] Not tainted VLI
EFLAGS: 00010246 (2.6.17-rc1 #12)
EIP is at r_show+0x134/0x157
eax: 00000000 ebx: c05358e8 ecx: ffffffff edx: 00000000
esi: f54a26c7 edi: c05358eb ebp: f44f7f14 esp: f44f7ecc
ds: 007b es: 007b ss: 0068
Process cat (pid: 11983, threadinfo=f44f6000 task=f54a2540)
Stack: <0>c0157422 c70ff7c0 f4790920 00000000 c70fd6c8 f44f7eec c04ffb30
c05bd9b8
f44f7f14 c011cc45 f44f6000 f44f7f14 00000008 00000000 c05bd99c
c721d280
f54a26c5 c053961d f44f7f60 c017acf9 f5d94cc0 c721d280 f5f9e2c0
f47afddc
Call Trace:
<c01034c8> show_stack_log_lvl+0xcf/0xdf <c01036b8>
show_registers+0x192/0x208
<c01038b1> die+0x100/0x1ee <c0111858> do_page_fault+0x460/0x670
<c01030bb> error_code+0x4f/0x54 <c017acf9> seq_read+0xc6/0x3f1
<c015a3b4> vfs_read+0xa8/0x177 <c015a748> sys_read+0x47/0x6e
<c0102e2b> sysenter_past_esp+0x54/0x75
Code: c0 83 c4 3c 5b 5e 5f 5d c3 8b 55 ec 8b 42 10 89 54 24 04 c7 04 24
50 6a 53 c0 89 44 24 08 e8 af af ff ff e9 69 ff ff ff 8b 55 ec <8b> 42
10 89 54 24 08 89 44 24 0c 8b 45 08 c7 04 24 74 6a 53 c0
BUG: cat/11983, active lock [f5d94ce0(f5d94cc0-f5d94d40)] freed!
<c01033f7> show_trace+0x20/0x22 <c0103524> dump_stack+0x1e/0x20
<c012e199> mutex_debug_check_no_locks_freed+0x10e/0x17e <c01578f2>
kfree+0x40/0x73
<c017b32e> seq_release+0x22/0x2a <c015b4e9> __fput+0x163/0x192
<c015b384> fput+0x18/0x1a <c0159cb9> filp_close+0x45/0x6f
<c0119428> close_files+0x7f/0x9e <c0119497> put_files_struct+0x22/0x51
<c0119f5c> do_exit+0x13b/0x404 <c010399f> do_trap+0x0/0xb4
<c0111858> do_page_fault+0x460/0x670 <c01030bb> error_code+0x4f/0x54
<c017acf9> seq_read+0xc6/0x3f1 <c015a3b4> vfs_read+0xa8/0x177
<c015a748> sys_read+0x47/0x6e <c0102e2b> sysenter_past_esp+0x54/0x75
[f5d94ce0] {seq_open}
.. held by: cat:11983 [f54a2540, 115]
... acquired at: seq_read+0x27/0x3f1
Thanks
-Sachin
0:0: FAST-160 WIDE SCSI 320.0 MB/s DT IU RTI (6.25 ns, offset 127)
target1:0:0: Ending Domain Validation
I/O scheduler cfq not found
Vendor: IBM-ESXS Model: GNS146C3ESTT0ZFN Rev: JP83
Type: Direct-Access ANSI SCSI revision: 04
target1:0:1: asynchronous
scsi1:A:1:0: Tagged Queuing enabled. Depth 32
target1:0:1: Beginning Domain Validation
target1:0:1: wide asynchronous
target1:0:1: FAST-160 WIDE SCSI 320.0 MB/s DT IU RTI (6.25 ns, offset 127)
target1:0:1: Ending Domain Validation
I/O scheduler cfq not found
Vendor: IBM-ESXS Model: GNS146C3ESTT0ZFN Rev: JP83
Type: Direct-Access ANSI SCSI revision: 04
target1:0:2: asynchronous
scsi1:A:2:0: Tagged Queuing enabled. Depth 32
target1:0:2: Beginning Domain Validation
target1:0:2: wide asynchronous
target1:0:2: FAST-160 WIDE SCSI 320.0 MB/s DT IU RTI (6.25 ns, offset 127)
target1:0:2: Ending Domain Validation
I/O scheduler cfq not found
Vendor: IBM-ESXS Model: MAT3147NC FN Rev: B411
Type: Direct-Access ANSI SCSI revision: 04
target1:0:3: asynchronous
scsi1:A:3:0: Tagged Queuing enabled. Depth 32
target1:0:3: Beginning Domain Validation
target1:0:3: wide asynchronous
target1:0:3: FAST-160 WIDE SCSI 320.0 MB/s DT IU RDSTRM RTI WRFLOW PCOMP (6.25 ns, offset 127)
target1:0:3: Ending Domain Validation
I/O scheduler cfq not found
Vendor: IBM-ESXS Model: GNS146C3ESTT0ZFN Rev: JP83
Type: Direct-Access ANSI SCSI revision: 04
target1:0:4: asynchronous
scsi1:A:4:0: Tagged Queuing enabled. Depth 32
target1:0:4: Beginning Domain Validation
target1:0:4: wide asynchronous
target1:0:4: FAST-160 WIDE SCSI 320.0 MB/s DT IU RTI (6.25 ns, offset 127)
target1:0:4: Ending Domain Validation
I/O scheduler cfq not found
Vendor: IBM-ESXS Model: GNS146C3ESTT0ZFN Rev: JP83
Type: Direct-Access ANSI SCSI revision: 04
target1:0:5: asynchronous
scsi1:A:5:0: Tagged Queuing enabled. Depth 32
target1:0:5: Beginning Domain Validation
target1:0:5: wide asynchronous
target1:0:5: FAST-160 WIDE SCSI 320.0 MB/s DT IU RTI (6.25 ns, offset 127)
target1:0:5: Ending Domain Validation
I/O scheduler cfq not found
I/O scheduler cfq not found
Vendor: IBM Model: 02R0962a S320 1 Rev: 1
Type: Processor ANSI SCSI revision: 02
target1:0:8: asynchronous
target1:0:8: Beginning Domain Validation
target1:0:8: Ending Domain Validation
I/O scheduler cfq not found
I/O scheduler cfq not found
I/O scheduler cfq not found
I/O scheduler cfq not found
I/O scheduler cfq not found
I/O scheduler cfq not found
I/O scheduler cfq not found
libata version 1.20 loaded.
SCSI device sda: 286748000 512-byte hdwr sectors (146815 MB)
sda: Write Protect is off
sda: Mode Sense: cb 00 10 08
SCSI device sda: drive cache: write through w/ FUA
SCSI device sda: 286748000 512-byte hdwr sectors (146815 MB)
sda: Write Protect is off
sda: Mode Sense: cb 00 10 08
SCSI device sda: drive cache: write through w/ FUA
sda: sda1 sda2 < sda5 sda6 sda7 sda8 sda9 >
sd 1:0:0:0: Attached scsi disk sda
SCSI device sdb: 286748000 512-byte hdwr sectors (146815 MB)
sdb: Write Protect is off
sdb: Mode Sense: cb 00 10 08
SCSI device sdb: drive cache: write through w/ FUA
SCSI device sdb: 286748000 512-byte hdwr sectors (146815 MB)
sdb: Write Protect is off
sdb: Mode Sense: cb 00 10 08
SCSI device sdb: drive cache: write through w/ FUA
sdb: sdb1 < sdb5 sdb6 sdb7 sdb8 >
sd 1:0:1:0: Attached scsi disk sdb
SCSI device sdc: 286748000 512-byte hdwr sectors (146815 MB)
sdc: Write Protect is off
sdc: Mode Sense: cb 00 10 08
SCSI device sdc: drive cache: write through w/ FUA
SCSI device sdc: 286748000 512-byte hdwr sectors (146815 MB)
sdc: Write Protect is off
sdc: Mode Sense: cb 00 10 08
SCSI device sdc: drive cache: write through w/ FUA
sdc: sdc1 < sdc5 sdc6 sdc7 sdc8 sdc9 sdc10 >
sd 1:0:2:0: Attached scsi disk sdc
SCSI device sdd: 286748000 512-byte hdwr sectors (146815 MB)
sdd: Write Protect is off
sdd: Mode Sense: cf 00 00 08
SCSI device sdd: drive cache: write through
SCSI device sdd: 286748000 512-byte hdwr sectors (146815 MB)
sdd: Write Protect is off
sdd: Mode Sense: cf 00 00 08
SCSI device sdd: drive cache: write through
sdd: sdd1 < sdd5 >
sd 1:0:3:0: Attached scsi disk sdd
SCSI device sde: 286748000 512-byte hdwr sectors (146815 MB)
sde: Write Protect is off
sde: Mode Sense: cb 00 10 08
SCSI device sde: drive cache: write through w/ FUA
SCSI device sde: 286748000 512-byte hdwr sectors (146815 MB)
sde: Write Protect is off
sde: Mode Sense: cb 00 10 08
SCSI device sde: drive cache: write through w/ FUA
sde: unknown partition table
sd 1:0:4:0: Attached scsi disk sde
SCSI device sdf: 286748000 512-byte hdwr sectors (146815 MB)
sdf: Write Protect is off
sdf: Mode Sense: cb 00 10 08
SCSI device sdf: drive cache: write through w/ FUA
SCSI device sdf: 286748000 512-byte hdwr sectors (146815 MB)
sdf: Write Protect is off
sdf: Mode Sense: cb 00 10 08
SCSI device sdf: drive cache: write through w/ FUA
sdf: sdf1 < sdf5 sdf6 sdf7 sdf8 >
sd 1:0:5:0: Attached scsi disk sdf
sd 1:0:0:0: Attached scsi generic sg0 type 0
sd 1:0:1:0: Attached scsi generic sg1 type 0
sd 1:0:2:0: Attached scsi generic sg2 type 0
sd 1:0:3:0: Attached scsi generic sg3 type 0
sd 1:0:4:0: Attached scsi generic sg4 type 0
sd 1:0:5:0: Attached scsi generic sg5 type 0
1:0:8:0: Attached scsi generic sg6 type 3
ieee1394: raw1394: /dev/raw1394 device initialized
ACPI: PCI Interrupt Link [LP07] enabled at IRQ 5
ACPI: PCI Interrupt 0000:00:1d.7[D] -> Link [LP07] -> GSI 5 (level, low) -> IRQ 5
PCI: Setting latency timer of device 0000:00:1d.7 to 64
ehci_hcd 0000:00:1d.7: EHCI Host Controller
ehci_hcd 0000:00:1d.7: new USB bus registered, assigned bus number 1
ehci_hcd 0000:00:1d.7: debug port 1
PCI: cache line size of 128 is not supported by device 0000:00:1d.7
ehci_hcd 0000:00:1d.7: irq 5, io mem 0xf0000000
ehci_hcd 0000:00:1d.7: USB 2.0 started, EHCI 1.00, driver 10 Dec 2004
usb usb1: configuration #1 chosen from 1 choice
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 4 ports detected
USB Universal Host Controller Interface driver v3.0
ACPI: PCI Interrupt 0000:00:1d.0[A] -> Link [LP00] -> GSI 5 (level, low) -> IRQ 5
PCI: Setting latency timer of device 0000:00:1d.0 to 64
uhci_hcd 0000:00:1d.0: UHCI Host Controller
uhci_hcd 0000:00:1d.0: new USB bus registered, assigned bus number 2
uhci_hcd 0000:00:1d.0: irq 5, io base 0x00002200
usb usb2: configuration #1 chosen from 1 choice
hub 2-0:1.0: USB hub found
hub 2-0:1.0: 2 ports detected
ACPI: PCI Interrupt 0000:00:1d.1[B] -> Link [LP03] -> GSI 11 (level, low) -> IRQ 11
PCI: Setting latency timer of device 0000:00:1d.1 to 64
uhci_hcd 0000:00:1d.1: UHCI Host Controller
uhci_hcd 0000:00:1d.1: new USB bus registered, assigned bus number 3
uhci_hcd 0000:00:1d.1: irq 11, io base 0x00002600
usb usb3: configuration #1 chosen from 1 choice
hub 3-0:1.0: USB hub found
hub 3-0:1.0: 2 ports detected
usbcore: registered new driver usblp
drivers/usb/class/usblp.c: v0.13: USB Printer Device Class driver
Initializing USB Mass Storage driver...
usbcore: registered new driver usb-storage
USB Mass Storage support registered.
usbcore: registered new driver usbhid
drivers/usb/input/hid-core.c: v2.6:USB HID core driver
PNP: PS/2 Controller [PNP0303:PS2K,PNP0f13:PS2M] at 0x64,0x60 irq 1,12
PNP: PS/2 controller has invalid data port 0x64; using default 0x60
PNP: PS/2 controller has invalid command port 0x60; using default 0x64
serio: i8042 AUX port at 0x60,0x64 irq 12
serio: i8042 KBD port at 0x60,0x64 irq 1
mice: PS/2 mouse device common for all mice
Advanced Linux Sound Architecture Driver Version 1.0.11rc4 (Wed Mar 22 10:27:24 2006 UTC).
ALSA device list:
No soundcards found.
oprofile: using timer interrupt.
NET: Registered protocol family 2
input: AT Translated Set 2 keyboard as /class/input/input0
IP route cache hash table entries: 131072 (order: 7, 524288 bytes)
TCP established hash table entries: 262144 (order: 10, 4194304 bytes)
TCP bind hash table entries: 65536 (order: 8, 1310720 bytes)
TCP: Hash tables configured (established 262144 bind 65536)
TCP reno registered
ip_conntrack version 2.4 (8192 buckets, 65536 max) - 172 bytes per conntrack
TCP bic registered
NET: Registered protocol family 1
NET: Registered protocol family 17
Using IPI Shortcut mode
ACPI wakeup devices:
PCI0
ACPI: (supports S0 S4 S5)
kjournald starting. Commit interval 5 seconds
EXT3-fs: mounted filesystem with ordered data mode.
VFS: Mounted root (ext3 filesystem) readonly.
Freeing unused kernel memory: 204k freed
input: ImExPS/2 Generic Explorer Mouse as /class/input/input1
EXT3 FS on sda5, internal journal
Adding 4200956k swap on /dev/sda9. Priority:42 extents:1 across:4200956k
kjournald starting. Commit interval 5 seconds
EXT3 FS on sda8, internal journal
EXT3-fs: mounted filesystem with ordered data mode.
kjournald starting. Commit interval 5 seconds
EXT3 FS on sda1, internal journal
EXT3-fs: mounted filesystem with ordered data mode.
ReiserFS: sdb5: found reiserfs format "3.6" with standard journal
ReiserFS: sdb5: warning: CONFIG_REISERFS_CHECK is set ON
ReiserFS: sdb5: warning: - it is slow mode for debugging.
ReiserFS: sdb5: using ordered data mode
ReiserFS: sdb5: journal params: device sdb5, size 8192, journal first block 18, max trans len 1024, max batch 900, max commit age 30, max trans age 30
ReiserFS: sdb5: checking transaction log (sdb5)
ReiserFS: sdb5: journal-1153: found in header: first_unflushed_offset 2566, last_flushed_trans_id 324114
ReiserFS: sdb5: journal-1206: Starting replay from offset 1392063325145606, trans_id 0
ReiserFS: sdb5: journal-1299: Setting newest_mount_id to 57
ReiserFS: sdb5: Using r5 hash to sort names
jfs_mount: Mount Failure: File System Dirty.
Mount JFS Failure: -22
jfs_mount failed w/return code = -22
XFS mounting filesystem sdb7
Ending clean XFS mount for filesystem: sdb7
kjournald starting. Commit interval 5 seconds
EXT3 FS on sda6, internal journal
EXT3-fs: mounted filesystem with ordered data mode.
kjournald starting. Commit interval 5 seconds
EXT3 FS on sda7, internal journal
EXT3-fs: mounted filesystem with ordered data mode.
e1000: eth0: e1000_watchdog_task: NIC Link is Up 100 Mbps Full Duplex
end_request: I/O error, dev fd0, sector 0
end_request: I/O error, dev fd0, sector 0
program hwscan is using a deprecated SCSI ioctl, please convert it to SG_IO
program hwscan is using a deprecated SCSI ioctl, please convert it to SG_IO
program hwscan is using a deprecated SCSI ioctl, please convert it to SG_IO
program hwscan is using a deprecated SCSI ioctl, please convert it to SG_IO
program hwscan is using a deprecated SCSI ioctl, please convert it to SG_IO
program hwscan is using a deprecated SCSI ioctl, please convert it to SG_IO
BUG: unable to handle kernel NULL pointer dereference at virtual address 00000010
printing eip:
c011cdef
*pde = 00000000
Oops: 0000 [#1]
Modules linked in:
CPU: 0
EIP: 0060:[<c011cdef>] Not tainted VLI
EFLAGS: 00010246 (2.6.17-rc1 #12)
EIP is at r_show+0x134/0x157
eax: 00000000 ebx: c05358e8 ecx: ffffffff edx: 00000000
esi: f54a26c7 edi: c05358eb ebp: f44f7f14 esp: f44f7ecc
ds: 007b es: 007b ss: 0068
Process cat (pid: 11983, threadinfo=f44f6000 task=f54a2540)
Stack: <0>c0157422 c70ff7c0 f4790920 00000000 c70fd6c8 f44f7eec c04ffb30 c05bd9b8
f44f7f14 c011cc45 f44f6000 f44f7f14 00000008 00000000 c05bd99c c721d280
f54a26c5 c053961d f44f7f60 c017acf9 f5d94cc0 c721d280 f5f9e2c0 f47afddc
Call Trace:
<c01034c8> show_stack_log_lvl+0xcf/0xdf <c01036b8> show_registers+0x192/0x208
<c01038b1> die+0x100/0x1ee <c0111858> do_page_fault+0x460/0x670
<c01030bb> error_code+0x4f/0x54 <c017acf9> seq_read+0xc6/0x3f1
<c015a3b4> vfs_read+0xa8/0x177 <c015a748> sys_read+0x47/0x6e
<c0102e2b> sysenter_past_esp+0x54/0x75
Code: c0 83 c4 3c 5b 5e 5f 5d c3 8b 55 ec 8b 42 10 89 54 24 04 c7 04 24 50 6a 53 c0 89 44 24 08 e8 af af ff ff e9 69 ff ff ff 8b 55 ec <8b> 42 10 89 54 24 08 89 44 24 0c 8b 45 08 c7 04 24 74 6a 53 c0
BUG: cat/11983, active lock [f5d94ce0(f5d94cc0-f5d94d40)] freed!
<c01033f7> show_trace+0x20/0x22 <c0103524> dump_stack+0x1e/0x20
<c012e199> mutex_debug_check_no_locks_freed+0x10e/0x17e <c01578f2> kfree+0x40/0x73
<c017b32e> seq_release+0x22/0x2a <c015b4e9> __fput+0x163/0x192
<c015b384> fput+0x18/0x1a <c0159cb9> filp_close+0x45/0x6f
<c0119428> close_files+0x7f/0x9e <c0119497> put_files_struct+0x22/0x51
<c0119f5c> do_exit+0x13b/0x404 <c010399f> do_trap+0x0/0xb4
<c0111858> do_page_fault+0x460/0x670 <c01030bb> error_code+0x4f/0x54
<c017acf9> seq_read+0xc6/0x3f1 <c015a3b4> vfs_read+0xa8/0x177
<c015a748> sys_read+0x47/0x6e <c0102e2b> sysenter_past_esp+0x54/0x75
[f5d94ce0] {seq_open}
.. held by: cat:11983 [f54a2540, 115]
... acquired at: seq_read+0x27/0x3f1
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