From: bk@freemail.sk
To: linux-kernel@vger.kernel.org
Subject: Kernel bug at slab.c when loading module with modem driver
1. One line summary of the problem
----------------------------------
Loading Motorola SM56 Softmodem driver causes kernel bug at slab.c line 1062.
2. Full description of the problem
----------------------------------
I've got Motorola SM56 Softmodem using vendor's driver. When I try to insert driver module by 'insmod sm56.o' I get kernel bug message followed by unsuccesfull installation of the module.
3. Kernel version
-----------------
cat /proc/version:
Linux version 2.4.9 (root@pentium-mmx) (gcc version 2.95.2 20000220 (Debian GNU/Linux)) #1 Ne srp 26 14:48:49 CEST 2001
4. Output of kernel bug message
-------------------------------
kernel: kernel BUG at slab.c:1062!
kernel: invalid operand: 0000
kernel: CPU: 0
kernel: EIP: 0010:[<c01237fb>]
kernel: EFLAGS: 00010282
kernel: eax: 0000001b ebx: c12272b4 ecx: c66e0000 edx: c6fdf320
kernel: esi: 00000202 edi: c12272b4 ebp: 00000007 esp: c66e1e38
kernel: ds: 0018 es: 0018 ss: 0018
kernel: Process modprobe (pid: 525, stackpage=c66e1000)
kernel: Stack: c021d57a c021d616 00000426 c12272b4 00000202 00000007 c66e1e8c c0263d54
kernel: c0123a99 c12272b4 00000007 00000064 00000000 c881f065 c886d24b 00000064
kernel: 00000007 c02af5a0 00000000 c881f000 c881f065 c66e1ebc c886d820 00000064
kernel: Call Trace: [<c0123a99>] [<c881f065>] [<c886d24b>] [<c881f065>] [<c886d820>]
kernel: [<c0113eba>] [<c881f065>] [<c886d54d>] [<c0107f4d>] [<c89247dc>] [<c0106c00>]
kernel: [<c89247dc>] [<c881f065>] [<c881f065>] [<c011142d>] [<c881f060>] [<c0106b63>]
kernel:
kernel: Code: 0f 0b 83 c4 0c f7 c5 00 10 00 00 0f 85 c4 01 00 00 a1 c8 77
5. Invoking error
-----------------
insmod /lib/modules/2.4.9/kernel/drivers/char/sm56.o
6. Installed software
---------------------
Motorola Softmodem SM56 Rel. 5.01 Build 01
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 pentium-mmx 2.4.9 #1 Ne srp 26 14:48:49 CEST 2001 i586 unknown
Gnu C 2.95.2
Gnu make 3.79.1
binutils 2.9.5.0.37
util-linux 2.10s
mount 2.10s
modutils 2.4.6
e2fsprogs 1.22
PPP 2.4.1
Linux C Library 2.1.3
ldd: version 1.9.11
Procps 2.0.6
Net-tools 1.60
Kbd [přepínač...]
Console-tools 0.2.3
Sh-utils 2.0
Modules Loaded sm56
7. Processor information
------------------------
cat /proc/cpuinfo:
processor : 0
vendor_id : GenuineIntel
cpu family : 5
model : 4
model name : Pentium MMX
stepping : 3
cpu MHz : 200.457
fdiv_bug : no
hlt_bug : no
f00f_bug : yes
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr mce cx8 mmx
bogomips : 399.76
8. Module information
---------------------
cat /proc/modules:
sm56 1346016 0 (unused)
9. Loaded driver and hardware information
-----------------------------------------
cat /proc/ioports:
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(set)
0300-031f : eth0
0376-0376 : ide1
0378-037a : parport0
03c0-03df : vga+
03f6-03f6 : ide0
03f8-03ff : serial(set)
0cf8-0cff : PCI conf1
6400-64ff : ATI Technologies Inc 3D Rage II+ 215GTB [Mach64 GTB]
6800-683f : Ensoniq ES1370 [AudioPCI]
6800-683f : es1370
f000-f00f : VIA Technologies, Inc. Bus Master IDE
f000-f007 : ide0
f008-f00f : ide1
cat /proc/iomem:
00000000-0009fbff : System RAM
0009fc00-0009ffff : reserved
000a0000-000bffff : Video RAM area
000c0000-000c7fff : Video ROM
000f0000-000fffff : System ROM
00100000-07ffffff : System RAM
00100000-00219ecf : Kernel code
00219ed0-0028045f : Kernel data
e0000000-e0ffffff : ATI Technologies Inc 3D Rage II+ 215GTB [Mach64 GTB]
e1000000-e1000fff : ATI Technologies Inc 3D Rage II+ 215GTB [Mach64 GTB]
e1001000-e10010ff : PCI device 11d4:1805 (Analog Devices)
ffff0000-ffffffff : reserved
10. PCI information
-------------------
output of lspci -vvv:
00:00.0 Host bridge: VIA Technologies, Inc. VT82C585VP [Apollo VP1/VPX] (rev 23)
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap- 66Mhz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR+
Latency: 64 set
00:07.0 ISA bridge: VIA Technologies, Inc. VT82C586/A/B PCI-to-ISA [Apollo VP] (rev 27)
Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0 set
00:07.1 IDE interface: VIA Technologies, Inc. VT82C586 IDE [Apollo] (rev 06) (prog-if 8a [Master SecP PriP])
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 64 set
Region 4: I/O ports at f000 [size=16]
00:09.0 VGA compatible controller: ATI Technologies Inc 3D Rage II+ 215GTB [Mach64 GTB] (rev 9a) (prog-if 00 [VGA])
Subsystem: ATI Technologies Inc: Unknown device 4755
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping+ SERR- FastB2B- Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 8 min, 64 set, cache line size 08
Region 0: Memory at e0000000 (32-bit, non-prefetchable) [size=16M]
Region 1: I/O ports at 6400 [size=256]
Region 2: Memory at e1000000 (32-bit, non-prefetchable) [size=4K]
Expansion ROM at <unassigned> [disabled] [size=128K]
00:0a.0 Multimedia audio controller: Ensoniq ES1370 [AudioPCI] (rev 01)
Subsystem: Unknown device 4942:4c4c
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=slow >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 12 min, 128 max, 64 set
Interrupt: pin A routed to IRQ 10
Region 0: I/O ports at 6800 [size=64]
00:0b.0 Communication controller: Analog Devices: Unknown device 1805
Subsystem: Analog Devices: Unknown device 1805
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR+
Latency: 1 min, 255 max, 64 set
Interrupt: pin A routed to IRQ 5
Region 0: Memory at e1001000 (32-bit, prefetchable) [size=256]
Capabilities: [dc] Power Management version 2
Flags: PMEClk- AuxPwr- DSI- D1- D2+ PME+
Status: D0 PME-Enable- DSel=0 DScale=0 PME+
11. /proc/slabinfo
------------------
/proc/slabinfo before driver is loaded:
slabinfo - version: 1.1
kmem_cache 55 78 100 2 2 1
ip_conntrack 0 11 352 0 1 1
tcp_tw_bucket 0 0 96 0 0 1
tcp_bind_bucket 16 113 32 1 1 1
tcp_open_request 0 0 64 0 0 1
inet_peer_cache 0 0 64 0 0 1
ip_fib_hash 8 113 32 1 1 1
ip_dst_cache 1 24 160 1 1 1
arp_cache 1 30 128 1 1 1
blkdev_requests 384 520 96 10 13 1
dnotify cache 0 0 20 0 0 1
file lock cache 16 42 92 1 1 1
fasync cache 1 202 16 1 1 1
uid_cache 4 113 32 1 1 1
skbuff_head_cache 79 96 160 4 4 1
sock 41 54 832 5 6 2
sigqueue 0 29 132 0 1 1
cdev_cache 273 295 64 5 5 1
bdev_cache 7 59 64 1 1 1
mnt_cache 11 59 64 1 1 1
inode_cache 1014 1016 480 127 127 1
dentry_cache 1411 1440 128 48 48 1
filp 254 280 96 7 7 1
names_cache 0 6 4096 0 6 1
buffer_head 19008 19040 96 476 476 1
mm_struct 28 48 160 2 2 1
vm_area_struct 737 767 64 13 13 1
fs_cache 27 59 64 1 1 1
files_cache 27 27 416 3 3 1
signal_act 29 30 1312 10 10 1
size-131072(DMA) 0 0 131072 0 0 32
size-131072 0 0 131072 0 0 32
size-65536(DMA) 0 0 65536 0 0 16
size-65536 0 0 65536 0 0 16
size-32768(DMA) 0 0 32768 0 0 8
size-32768 0 0 32768 0 0 8
size-16384(DMA) 0 0 16384 0 0 4
size-16384 0 0 16384 0 0 4
size-8192(DMA) 0 0 8192 0 0 2
size-8192 6 6 8192 6 6 2
size-4096(DMA) 0 0 4096 0 0 1
size-4096 27 27 4096 27 27 1
size-2048(DMA) 0 0 2048 0 0 1
size-2048 4 4 2048 2 2 1
size-1024(DMA) 0 0 1024 0 0 1
size-1024 22 24 1024 6 6 1
size-512(DMA) 0 0 512 0 0 1
size-512 23 24 512 3 3 1
size-256(DMA) 0 0 256 0 0 1
size-256 27 75 256 2 5 1
size-128(DMA) 0 0 128 0 0 1
size-128 457 510 128 16 17 1
size-64(DMA) 0 0 64 0 0 1
size-64 87 118 64 2 2 1
size-32(DMA) 0 0 32 0 0 1
size-32 260 339 32 3 3 1
/proc/slabinfo after driver is loaded using workaround (see chapter 12):
slabinfo - version: 1.1
kmem_cache 55 78 100 2 2 1
ip_conntrack 0 11 352 0 1 1
tcp_tw_bucket 0 0 96 0 0 1
tcp_bind_bucket 16 113 32 1 1 1
tcp_open_request 0 0 64 0 0 1
inet_peer_cache 0 0 64 0 0 1
ip_fib_hash 8 113 32 1 1 1
ip_dst_cache 1 24 160 1 1 1
arp_cache 1 30 128 1 1 1
blkdev_requests 384 520 96 10 13 1
dnotify cache 0 0 20 0 0 1
file lock cache 16 42 92 1 1 1
fasync cache 1 202 16 1 1 1
uid_cache 4 113 32 1 1 1
skbuff_head_cache 79 96 160 4 4 1
sock 41 54 832 5 6 2
sigqueue 0 29 132 0 1 1
cdev_cache 273 295 64 5 5 1
bdev_cache 7 59 64 1 1 1
mnt_cache 11 59 64 1 1 1
inode_cache 1019 1024 480 128 128 1
dentry_cache 1419 1440 128 48 48 1
filp 254 280 96 7 7 1
names_cache 0 6 4096 0 6 1
buffer_head 19044 19080 96 477 477 1
mm_struct 28 48 160 2 2 1
vm_area_struct 737 767 64 13 13 1
fs_cache 27 59 64 1 1 1
files_cache 27 27 416 3 3 1
signal_act 29 30 1312 10 10 1
size-131072(DMA) 0 0 131072 0 0 32
size-131072 0 0 131072 0 0 32
size-65536(DMA) 0 0 65536 0 0 16
size-65536 0 0 65536 0 0 16
size-32768(DMA) 0 0 32768 0 0 8
size-32768 0 0 32768 0 0 8
size-16384(DMA) 1 1 16384 1 1 4
size-16384 0 0 16384 0 0 4
size-8192(DMA) 0 0 8192 0 0 2
size-8192 6 6 8192 6 6 2
size-4096(DMA) 3 3 4096 3 3 1
size-4096 28 29 4096 28 29 1
size-2048(DMA) 0 0 2048 0 0 1
size-2048 4 6 2048 2 3 1
size-1024(DMA) 0 0 1024 0 0 1
size-1024 22 24 1024 6 6 1
size-512(DMA) 2 8 512 1 1 1
size-512 23 32 512 3 4 1
size-256(DMA) 0 0 256 0 0 1
size-256 27 75 256 2 5 1
size-128(DMA) 2 30 128 1 1 1
size-128 457 510 128 16 17 1
size-64(DMA) 1 59 64 1 1 1
size-64 89 118 64 2 2 1
size-32(DMA) 1 113 32 1 1 1
size-32 272 339 32 3 3 1
12. Bug workaround
------------------
The bug can be workarounded by commenting lines 1061 and 1062 at slab.c, that causes the bug report. It seems modem works without problem then.
13. Notice for different kernel version
---------------------------------------
kernel-linux 2.4.5:
-no kernel bug report
-no unresolved symbols
-modem works OK
kernel-linux 2.4.7:
-kernel bug appears (at slab.c:1062)
-no unresolved symbols
-modem works only using workaround (see chapter 12)
kernel-linux 2.4.9:
-kernel bug appears (ar slab.c:1062)
-found some unresolved symbols
-modem works only using workaround (see chapter 12)
I don't think the bug is caused by unresolved symbols, because this bug appeared also (as you can see) in Linux 2.4.7. Because SM56 modem driver isn't open-source, we must wait until Motorola fix unresolved symbols himself.
Thanks,
Bohdan Kolecek
(Excuse my English)
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This archive was generated by hypermail 2b29 : Fri Aug 31 2001 - 21:00:20 EST