Posible DMA problem in IDE-SCSI emulation.
[2.] Full description of the problem/report:
With IDE-SCSI emulation, I got a kernel panic from the SCSI subsystem (text
follows) about a DMA leak. I have not UDMA enabled when this happened, but
last week I did and mi machine crashed 3 times in one day, presumably due to
UDMA, or some kind of interaction between UDMA and IDE-SCSI emulation. When
I deactivated UDMA (big performance loss ;-((), the problem seemed to go
away - till today. Magic SysRq worked great. ;-)
[3.] Keywords (i.e., modules, networking, kernel):
ide, scsi, panic
[4.] Kernel version (from /proc/version):
Linux version 2.2.3 (root@pcmaster.dea.icai.upco.es) (gcc version 2.7.2.3)
#2 Tue Mar 23 12:16:54 CET 1999
[5.] Output of Oops.. message (if applicable) with symbolic information
resolved (see Documentation/oops-tracing.txt)
The exact text from the panic is this (I include several lines after and
before, just in case it helps):
-- /var/log/messages --
Mar 25 12:00:29 pcmaster kernel: scsi0 : SCSI host adapter emulation for IDE
ATAPI devices
Mar 25 12:00:29 pcmaster kernel: scsi : 1 host.
Mar 25 12:00:29 pcmaster kernel: Vendor: HP Model: CD-Writer+ 7100
Rev: 1.00
Mar 25 12:00:29 pcmaster kernel: Type: CD-ROM
ANSI SCSI revision: 02
Mar 25 12:00:29 pcmaster kernel: Vendor: ATAPI Model: CD-ROM DRIVE-36X
Rev: 36FP
Mar 25 12:00:29 pcmaster kernel: Type: CD-ROM
ANSI SCSI revision: 02
Mar 25 12:00:29 pcmaster kernel: Detected scsi CD-ROM sr0 at scsi0, channel
0, id 0, lun 0
Mar 25 12:00:29 pcmaster kernel: Detected scsi CD-ROM sr1 at scsi0, channel
0, id 1, lun 0
Mar 25 12:00:29 pcmaster kernel: sr0: scsi3-mmc drive: 2x/6x writer cd/rw
xa/form2 cdda tray
Mar 25 12:00:29 pcmaster kernel: Uniform CDROM driver Revision: 2.52
Mar 25 12:00:29 pcmaster kernel: sr1: scsi3-mmc drive: 32x/32x cd/rw
xa/form2 cdda tray
Mar 25 12:06:05 pcmaster kernel: scsi0: MEDIUM ERROR on channel 0, id 1, lun
0, CDB: Request Sense 00 00 00 10 00
Mar 25 12:06:05 pcmaster kernel: extra data not valid Current error sr0b:01:
sense key Medium Error
Mar 25 12:06:05 pcmaster kernel: Additional sense indicates No seek complete
Mar 25 12:06:05 pcmaster kernel: CD-ROM I/O error: dev 0b:01, sector 1299912
Mar 25 12:07:35 pcmaster kernel: scsi : 0 hosts.
Mar 25 12:07:35 pcmaster kernel: Uniform CD-ROM driver unloaded
Mar 25 12:08:57 pcmaster kernel: scsi0 : SCSI host adapter emulation for IDE
ATAPI devices
Mar 25 12:08:57 pcmaster kernel: scsi : 1 host.
Mar 25 12:08:57 pcmaster kernel: Vendor: HP Model: CD-Writer+ 7100
Rev: 1.00
Mar 25 12:08:57 pcmaster kernel: Type: CD-ROM
ANSI SCSI revision: 02
Mar 25 12:08:57 pcmaster kernel: Vendor: ATAPI Model: CD-ROM DRIVE-36X
Rev: 36FP
Mar 25 12:08:57 pcmaster kernel: Type: CD-ROM
ANSI SCSI revision: 02
Mar 25 12:11:15 pcmaster ftpd[12254]: FTP LOGIN FROM clint.dea.icai.upco.es
[130.206.71.200], jorgegv
Mar 25 12:11:55 pcmaster ftpd[12254]: FTP session closed
Mar 25 12:30:58 pcmaster PAM_pwdb[12274]: (su) session opened for user root
by jorgegv(uid=0)
Mar 25 12:49:35 pcmaster kernel: scsi : 0 hosts.
Mar 25 12:49:35 pcmaster kernel: Kernel panic: SCSI DMA pool memory leak 127
128
Mar 25 12:49:35 pcmaster kernel:
Mar 25 12:50:38 pcmaster kernel: SysRq: Emergency Sync
Mar 25 12:50:39 pcmaster kernel: Syncing device 03:03 ... OK
Mar 25 12:50:39 pcmaster kernel: Done.
-- end of /var/log/messages --
[6.] A small shell script or example program which triggers the
problem (if possible)
[7.] Environment
[7.1.] Software (add the output of the ver_linux script here)
-- Versions installed: (if some fields are empty or looks
-- unusual then possibly you have very old versions)
Linux pcmaster.dea.icai.upco.es 2.2.3 #2 Tue Mar 23 12:16:54 CET 1999 i686
unknown
Kernel modules 2.1.121
Gnu C 2.7.2.3
Binutils 2.9.1.0.15
Linux C Library 2.0.7
Dynamic linker ldd (GNU libc) 2.0.7
Linux C++ Library 2.8.0
Procps 1.2.9
Mount 2.8a
Net-tools (1999-01-01)
Kbd 0.96
Sh-utils 1.16
[7.2.] Processor information (from /proc/cpuinfo):
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 5
model name : Pentium II (Deschutes)
stepping : 2
cpu MHz : 334.094038
cache size : 512 KB
fdiv_bug : no
hlt_bug : no
sep_bug : no
f00f_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov
pat pse36 mmx osfxsr
bogomips : 333.41
[7.3.] Module information (from /proc/modules):
sr_mod 15796 0 (autoclean) (unused)
ide-scsi 6608 0 (autoclean)
sg 3724 0 (autoclean)
scsi_mod 46172 3 (autoclean) [sr_mod ide-scsi sg]
cdrom 11584 0 (autoclean) [sr_mod]
3c59x 17456 1 (autoclean)
[7.4.] SCSI information (from /proc/scsi/scsi)
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: HP Model: CD-Writer+ 7100 Rev: 1.00
Type: CD-ROM ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 01 Lun: 00
Vendor: ATAPI Model: CD-ROM DRIVE-36X Rev: 36FP
Type: CD-ROM ANSI SCSI revision: 02
[7.5.] Other information that might be relevant to the problem
(please look in /proc and include all information that you
think to be relevant):
Don't know. This is my first bug report.
[X.] Other notes, patches, fixes, workarounds:
BTW, last week, also, I did a "lsmod" sometime and the ide-scsi module
showed up as "(uninitialized)". Don't know exactly what this implies, but
doesn't look very good...
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