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SubjectKernel bug in dcache.h:266; 2.5.64, EIP at sysfs_remove_dir
Hi, 

I left my computer unattended, when I got back, the BUG was
on screen. I was unable to start XFree86 after that, so this seems
serious ;). I found bug after 1 day and 2 hours of uptime (system
was left alone 4 earlier; XFree was not running).

1) output of ver_linux

If some fields are empty or look unusual you may have an old version.
Compare to the current minimal requirements in Documentation/Changes.

Linux mother 2.5.64 #9 śro mar 5 14:03:36 CET 2003 i686 unknown

Gnu C 2.95.3
Gnu make 3.79.1
util-linux 2.11l
mount 2.11l
module-init-tools 0.9.10
e2fsprogs 1.32
jfsutils 1.1.1
reiserfsprogs 3.6.3
xfsprogs 2.0.3
Linux C Library 2.2.5
Dynamic linker (ldd) 2.2.5
Procps 2.0.9
Net-tools 1.60
Kbd 1.06
Sh-utils 2.0
Modules Loaded jfs

2) Related to:

My wild guess (based on vtund process in oops-dump): bad interaction
of net and sysfs layer. (Is this possible?)

3). I don't know how to reproduce.

4). Enviromnent:


processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 6
model name : Celeron (Mendocino)
stepping : 5
cpu MHz : 368.277
cache size : 128 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 mmx fxsr
bogomips : 720.89

Modules:
jfs 155464 1 - Live 0xc8942000


0000-001f : dma1
0020-003f : pic1
0040-005f : timer
0060-006f : keyboard
0070-007f : rtc
0080-008f : dma page reg
00a0-00bf : pic2
00c0-00df : dma2
00f0-00ff : fpu
0170-0177 : ide1
01f0-01f7 : ide0
02f8-02ff : serial
0376-0376 : ide1
0378-037a : parport0
03c0-03df : vga+
03f6-03f6 : ide0
03f8-03ff : serial
0cf8-0cff : PCI conf1
5000-500f : VIA Technologies, In VT82C686 [Apollo Sup
6000-607f : VIA Technologies, In VT82C686 [Apollo Sup
d000-d00f : VIA Technologies, In VT82C586/B/686A/B PI
d000-d007 : ide0
d008-d00f : ide1
d400-d41f : VIA Technologies, In USB
d800-d81f : VIA Technologies, In USB (#2)
dc00-dcff : VIA Technologies, In VT82C686 AC97 Audio
e000-e003 : VIA Technologies, In VT82C686 AC97 Audio
e400-e403 : VIA Technologies, In VT82C686 AC97 Audio
e800-e8ff : Realtek Semiconducto RTL-8139/8139C/8139C
e800-e8ff : 8139too
ec00-ec3f : Ensoniq ES1370 [AudioPCI]
ec00-ec3f : Ensoniq AudioPCI

00000000-0009ffff : System RAM
000a0000-000bffff : Video RAM area
000c0000-000c7fff : Video ROM
000f0000-000fffff : System ROM
00100000-07feffff : System RAM
00100000-00361f26 : Kernel code
00361f27-00484243 : Kernel data
07ff0000-07ff2fff : ACPI Non-volatile Storage
07ff3000-07ffffff : ACPI Tables
e0000000-e3ffffff : VIA Technologies, In VT82C693A/694x [Apol
e4000000-e7ffffff : PCI Bus #01
e4000000-e4003fff : Matrox Graphics, Inc MGA G550 AGP
e5000000-e57fffff : Matrox Graphics, Inc MGA G550 AGP
e8000000-e9ffffff : PCI Bus #01
e8000000-e9ffffff : Matrox Graphics, Inc MGA G550 AGP
ea000000-ea0000ff : Realtek Semiconducto RTL-8139/8139C/8139C
ea000000-ea0000ff : 8139too
ffff0000-ffffffff : reserved

Full dmesg from system start, with BUG() output at the end:


Linux version 2.5.64 (zdzichu@mother) (gcc version 2.95.3 20010315 (release)) #9 śro mar 5 14:03:36 CET 2003
Video mode to be used for restore is f00
BIOS-provided physical RAM map:
BIOS-e820: 0000000000000000 - 00000000000a0000 (usable)
BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
BIOS-e820: 0000000000100000 - 0000000007ff0000 (usable)
BIOS-e820: 0000000007ff0000 - 0000000007ff3000 (ACPI NVS)
BIOS-e820: 0000000007ff3000 - 0000000008000000 (ACPI data)
BIOS-e820: 00000000ffff0000 - 0000000100000000 (reserved)
127MB LOWMEM available.
On node 0 totalpages: 32752
DMA zone: 4096 pages, LIFO batch:1
Normal zone: 28656 pages, LIFO batch:6
HighMem zone: 0 pages, LIFO batch:1
ACPI: RSDP (v000 VIA693 ) @ 0x000f70c0
ACPI: RSDT (v001 AWARD AWRDACPI 16944.11825) @ 0x07ff3000
ACPI: FADT (v001 AWARD AWRDACPI 16944.11825) @ 0x07ff3040
ACPI: DSDT (v001 VIA693 AWRDACPI 00000.04096) @ 0x00000000
ACPI: BIOS passes blacklist
ACPI: MADT not present
Building zonelist for node : 0
Kernel command line: auto BOOT_IMAGE=linux2_5fb root=303 video=matrox:1024x768-16@75 root=/dev/ide/host0/bus0/target0/lun0/part3
Local APIC disabled by BIOS -- reenabling.
Found and enabled local APIC!
Initializing CPU#0
PID hash table entries: 512 (order 9: 4096 bytes)
Detected 368.178 MHz processor.
Console: colour VGA+ 80x25
Calibrating delay loop... 720.89 BogoMIPS
Memory: 125148k/131008k available (2439k kernel code, 5328k reserved, 1160k data, 136k init, 0k highmem)
Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
Failed to register 'sysfs' in sysfs
-> /dev
-> /dev/console
-> /root
CPU: L1 I cache: 16K, L1 D cache: 16K
CPU: L2 cache: 128K
CPU: After generic, caps: 0183fbff 00000000 00000000 00000000
Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#0.
CPU: Intel Celeron (Mendocino) stepping 05
Enabling fast FPU save and restore... done.
Checking 'hlt' instruction... OK.
POSIX conformance testing by UNIFIX
enabled ExtINT on CPU#0
ESR value before enabling vector: 00000000
ESR value after enabling vector: 00000000
Using local APIC timer interrupts.
calibrating APIC timer ...
..... CPU clock speed is 368.0238 MHz.
..... host bus clock speed is 66.0952 MHz.
Linux NET4.0 for Linux 2.4
Based upon Swansea University Computer Society NET3.039
Initializing RT netlink socket
mtrr: v2.0 (20020519)
PCI: PCI BIOS revision 2.10 entry at 0xfb2b0, last bus=1
PCI: Using configuration type 1
BIO: pool of 256 setup, 14Kb (56 bytes/bio)
biovec pool[0]: 1 bvecs: 242 entries (12 bytes)
biovec pool[1]: 4 bvecs: 242 entries (48 bytes)
biovec pool[2]: 16 bvecs: 242 entries (192 bytes)
biovec pool[3]: 64 bvecs: 242 entries (768 bytes)
biovec pool[4]: 128 bvecs: 121 entries (1536 bytes)
biovec pool[5]: 256 bvecs: 60 entries (3072 bytes)
ACPI: Subsystem revision 20030228
ACPI: Interpreter enabled
ACPI: Using PIC for interrupt routing
ACPI: PCI Root Bridge [PCI0] (00:00)
PCI: Probing PCI hardware (bus 00)
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0._PRT]
ACPI: PCI Interrupt Link [LNKA] (IRQs 1 3 4 5 6 7 10 *11 12 14 15)
ACPI: PCI Interrupt Link [LNKB] (IRQs 1 3 4 5 6 7 10 11 12 14 15, enabled at IRQ 9)
ACPI: PCI Interrupt Link [LNKC] (IRQs 1 3 4 5 6 7 10 11 *12 14 15)
ACPI: PCI Interrupt Link [LNKD] (IRQs 1 3 4 5 6 7 *10 11 12 14 15)
block request queues:
128 requests per read queue
128 requests per write queue
8 requests per batch
enter congestion at 15
exit congestion at 17
PCI: Using ACPI for IRQ routing
PCI: if you experience problems, try using option 'pci=noacpi' or even 'acpi=off'
Enabling SEP on CPU 0
aio_setup: sizeof(struct page) = 40
Journalled Block Device driver loaded
Coda Kernel/Venus communications, v5.3.15, coda@cs.cmu.edu
devfs: v1.22 (20021013) Richard Gooch (rgooch@atnf.csiro.au)
devfs: boot_options: 0x1
udf: registering filesystem
Initializing Cryptographic API
PCI: Disabling Via external APIC routing
ACPI: Power Button (FF) [PWRF]
ACPI: Processor [CPU0] (supports C1 C2, 2 throttling states)
Serial: 8250/16550 driver $Revision: 1.90 $ IRQ sharing disabled
tts/0 at I/O 0x3f8 (irq = 4) is a 16550A
tts/1 at I/O 0x2f8 (irq = 3) is a 16550A
parport0: PC-style at 0x378 (0x778) [PCSPP,TRISTATE]
parport0: cpp_daisy: aa5500ff(08)
parport0: assign_addrs: aa5500ff(08)
parport0: cpp_daisy: aa5500ff(08)
parport0: assign_addrs: aa5500ff(08)
parport_pc: Via 686A parallel port: io=0x378
pty: 256 Unix98 ptys configured
lp0: using parport0 (polling).
Real Time Clock Driver v1.11
Non-volatile memory driver v1.2
Linux agpgart interface v0.100 (c) Dave Jones
agpgart: Detected VIA Apollo Pro 133 chipset
agpgart: Maximum main memory to use for agp memory: 94M
agpgart: AGP aperture is 64M @ 0xe0000000
[drm] Initialized mga 3.1.0 20021029 on minor 0
Floppy drive(s): fd0 is 1.44M
FDC 0 is a post-1991 82077
loop: loaded (max 8 devices)
8139too Fast Ethernet driver 0.9.26
eth0: RealTek RTL8139 Fast Ethernet at 0xc8829000, 00:06:4f:00:e8:99, IRQ 12
eth0: Identified 8139 chip type 'RTL-8139C'
Universal TUN/TAP device driver 1.5 (C)1999-2002 Maxim Krasnyansky
Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
VP_IDE: IDE controller at PCI slot 00:07.1
VP_IDE: chipset revision 6
VP_IDE: not 100% native mode: will probe irqs later
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
VP_IDE: VIA vt82c686a (rev 1b) IDE UDMA66 controller on pci00:07.1
ide0: BM-DMA at 0xd000-0xd007, BIOS settings: hda:DMA, hdb:pio
ide1: BM-DMA at 0xd008-0xd00f, BIOS settings: hdc:DMA, hdd:DMA
hda: ST38421A, ATA DISK drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
hdc: 8X4X32, ATAPI CD/DVD-ROM drive
hdd: ST32532A, ATA DISK drive
ide1 at 0x170-0x177,0x376 on irq 15
hda: host protected area => 1
hda: 16498944 sectors (8447 MB) w/256KiB Cache, CHS=16368/16/63, UDMA(66)
/dev/ide/host0/bus0/target0/lun0: p1 p2 p3
hdd: task_no_data_intr: status=0x51 { DriveReady SeekComplete Error }
hdd: task_no_data_intr: error=0x04 { DriveStatusError }
hdd: 4995648 sectors (2558 MB) w/128KiB Cache, CHS=4956/16/63, UDMA(33)
/dev/ide/host0/bus1/target1/lun0: p1 p2
hdc: ATAPI 32X CD-ROM CD-R/RW drive, 8192kB Cache, DMA
Uniform CD-ROM driver Revision: 3.12
mice: PS/2 mouse device common for all mice
serio: i8042 AUX port at 0x60,0x64 irq 12
input: AT Set 2 keyboard on isa0060/serio0
serio: i8042 KBD port at 0x60,0x64 irq 1
i2c-dev.o: i2c /dev entries driver module version 2.7.0 (20021208)
i2c-proc.o version 2.7.0 (20021208)
Advanced Linux Sound Architecture Driver Version 0.9.0rc7 (Sat Feb 15 15:01:21 2003 UTC).
request_module: failed /sbin/modprobe -- snd-card-0. error = -16
ALSA device list:
#0: Ensoniq AudioPCI ENS1370 at 0xec00, irq 10
NET4: Linux TCP/IP 1.0 for NET4.0
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP: Hash tables configured (established 8192 bind 8192)
IPv4 over IPv4 tunneling driver
GRE over IPv4 tunneling driver
ip_conntrack version 2.1 (1023 buckets, 8184 max) - 304 bytes per conntrack
ip_tables: (C) 2000-2002 Netfilter core team
Initializing IPsec netlink socket
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
IPv6 v0.8 for NET4.0
IPv6 over IPv4 tunneling driver
NET4: Ethernet Bridge 008 for NET4.0
Bridge firewalling registered
ACPI: (supports S0 S1 S4 S4bios S5)
UDF-fs DEBUG fs/udf/lowlevel.c:65:udf_get_last_session: CDROMMULTISESSION not supported: rc=-25
UDF-fs DEBUG fs/udf/super.c:1472:udf_fill_super: Multi-session=0
UDF-fs DEBUG fs/udf/super.c:460:udf_vrs: Starting at sector 16 (2048 byte sectors)
UDF-fs DEBUG fs/udf/super.c:1208:udf_check_valid: Failed to read byte 32768. Assuming open disc. Skipping validity check
UDF-fs DEBUG fs/udf/misc.c:286:udf_read_tagged: location mismatch block 256, tag 18 != 256
UDF-fs DEBUG fs/udf/super.c:1262:udf_load_partition: No Anchor block found
UDF-fs: No partition found (1)
found reiserfs format "3.6" with standard journal
Reiserfs journal params: device ide0(3,3), size 8192, journal first block 18, max trans len 1024, max batch 900, max commit age 30, max trans age 30
reiserfs: checking transaction log (ide0(3,3)) for (ide0(3,3))
reiserfs: replayed 29 transactions in 8 seconds
Using r5 hash to sort names
VFS: Mounted root (reiserfs filesystem) readonly.
Mounted devfs on /dev
Freeing unused kernel memory: 136k freed
blk: queue c04d113c, I/O limit 4095Mb (mask 0xffffffff)
hdc: drive_cmd: status=0x51 { DriveReady SeekComplete Error }
hdc: drive_cmd: error=0x04Aborted Command
kjournald starting. Commit interval 5 seconds
EXT3 FS 2.4-0.9.16, 02 Dec 2001 on ide1(22,65), internal journal
EXT3-fs: mounted filesystem with ordered data mode.
Disabled Privacy Extensions on device c04413a0(lo)
eth0: Setting 100mbps full-duplex based on auto-negotiated partner ability 45e1.
hda: dma_intr: status=0x51 { DriveReady SeekComplete Error }
hda: dma_intr: error=0x84 { DriveStatusError BadCRC }
Adding 251488k swap on /dev/ide/host0/bus1/target1/lun0/part2. Priority:1 extents:1
Adding 134756k swap on /swap. Priority:1 extents:3064
__ipv6_regen_rndid(): too short regeneration interval; timer diabled for eth0.
agpgart: Putting AGP V2 device at 00:00.0 into 2x mode
agpgart: Putting AGP V2 device at 01:00.0 into 2x mode
ISO 9660 Extensions: Microsoft Joliet Level 3
ISO 9660 Extensions: RRIP_1991A
hda: dma_intr: status=0x51 { DriveReady SeekComplete Error }
hda: dma_intr: error=0x84 { DriveStatusError BadCRC }
hda: dma_intr: status=0x51 { DriveReady SeekComplete Error }
hda: dma_intr: error=0x84 { DriveStatusError BadCRC }
tcpdump uses obsolete (PF_INET,SOCK_PACKET)
eth0: Promiscuous mode enabled.
device eth0 entered promiscuous mode
device eth0 left promiscuous mode
eth0: Promiscuous mode enabled.
device eth0 entered promiscuous mode
device eth0 left promiscuous mode
jfs: version magic '2.5.63 PENTIUMII gcc-2.95' should be '2.5.64 PENTIUMII gcc-2.95'
jfs: version magic '2.5.63 PENTIUMII gcc-2.95' should be '2.5.64 PENTIUMII gcc-2.95'
jfs: version magic '2.5.63 PENTIUMII gcc-2.95' should be '2.5.64 PENTIUMII gcc-2.95'
jfs: version magic '2.5.63 PENTIUMII gcc-2.95' should be '2.5.64 PENTIUMII gcc-2.95'
hda: dma_intr: status=0x51 { DriveReady SeekComplete Error }
hda: dma_intr: error=0x84 { DriveStatusError BadCRC }
hda: dma_intr: status=0x51 { DriveReady SeekComplete Error }
hda: dma_intr: error=0x84 { DriveStatusError BadCRC }
hda: dma_intr: status=0x51 { DriveReady SeekComplete Error }
hda: dma_intr: error=0x84 { DriveStatusError BadCRC }
hda: dma_intr: status=0x51 { DriveReady SeekComplete Error }
hda: dma_intr: error=0x84 { DriveStatusError BadCRC }
hda: dma_intr: status=0x51 { DriveReady SeekComplete Error }
hda: dma_intr: error=0x84 { DriveStatusError BadCRC }
hda: dma_intr: status=0x51 { DriveReady SeekComplete Error }
hda: dma_intr: error=0x84 { DriveStatusError BadCRC }
mtrr: MTRR 2 not used
mtrr: MTRR 2 not used
mtrr: MTRR 2 not used
------------[ cut here ]------------
kernel BUG at include/linux/dcache.h:266!
invalid operand: 0000
CPU: 0
EIP: 0060:[<c0167938>] Not tainted
EFLAGS: 00010246
EIP is at sysfs_remove_dir+0x18/0x116
eax: 00000000 ebx: c72dd9bc ecx: c72dd82c edx: 00000000
esi: c756af20 edi: c7fea560 ebp: c7720b40 esp: c7357f14
ds: 007b es: 007b ss: 0068
Process vtund (pid: 105, threadinfo=c7356000 task=c7a092e0)
Stack: c72dd9bc c72dd82c c7fea560 c7720b40 c72dd82c c0217af7 c72dd9bc c72dd9bc
c0217b0f c72dd9bc c72dd82c c02e5205 c72dd9bc c72dd82c c72dd800 c7fea560
c7720b40 c72dd9bc c02819d8 c72dd82c c72dd82c c5162660 c771f8a0 c0142864
Call Trace:
[<c0217af7>] kobject_del+0xb/0x18
[<c0217b0f>] kobject_unregister+0xb/0x18
[<c02e5205>] unregister_netdevice+0x20d/0x230
[<c02819d8>] tun_chr_close+0x9c/0xb0
[<c0142864>] __fput+0x30/0xc4
[<c0142833>] fput+0x13/0x14
[<c0141615>] filp_close+0x59/0x64
[<c0141667>] sys_close+0x47/0x58
[<c0108c9b>] syscall_call+0x7/0xb

Code: 0f 0b 0a 01 20 4c 37 c0 ff 06 80 4e 04 08 85 f6 0f 84 e2 00

My gzipped .config attached.


I hope this will help o squash the bug. I can do further testing
on this system, if asked.

--
Tomasz Torcz RIP is irrevelant. Spoofing is futile.
zdzichu@irc.-nie.spam-.pl Your routes will be aggreggated.
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