Processes receive SIGSEGV if TCQ is enabled

[Thomas Schlichter <schlicht@uni-mannheim.de>]

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Hello,

today I tried to test TCQ with the linux-2.6.0-test9-mm1 kernel. The config.gz 
is attached. But after enabling TCQ with 'hdparm -Q1 /dev/hda' newly started 
processes die due to a received SIGSEGV. No bad kernel messages appear...

Disabling TCQ again doesn't help, only e reboot does...
When I let the kernel enable TCQ at boot time, it set the TCQ buffer depth to 
8 and even the init script was killed!

Here some additional information:

schlicht@bigboss:~> uname -a
Linux bigboss 2.6.0-test9-mm1 #1 Thu Oct 30 14:45:35 CET 2003 i686 unknown 
unknown GNU/Linux
schlicht@bigboss:~> hdparm -i /dev/hda

/dev/hda:

 Model=IBM-DTLA-307030, FwRev=TX4OA50C, SerialNo=YK0YKT61943
 Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
 RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=40
 BuffType=DualPortCache, BuffSize=1916kB, MaxMultSect=16, MultSect=16
 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=60036480
 IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4
 DMA modes:  mdma0 mdma1 mdma2
 UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5
 AdvancedPM=yes: disabled (255) WriteCache=enabled
 Drive conforms to: ATA/ATAPI-5 T13 1321D revision 1:

 * signifies the current active mode

schlicht@bigboss:~> hdparm -i /dev/hdb
/dev/hdb: No such device or address
schlicht@bigboss:~> cat /proc/ide/via
----------VIA BusMastering IDE Configuration----------------
Driver Version:                     3.38
South Bridge:                       VIA vt8235
Revision:                           ISA 0x0 IDE 0x6
Highest DMA rate:                   UDMA133
BM-DMA base:                        0xec00
PCI clock:                          33.3MHz
Master Read  Cycle IRDY:            0ws
Master Write Cycle IRDY:            0ws
BM IDE Status Register Read Retry:  yes
Max DRDY Pulse Width:               No limit
-----------------------Primary IDE-------Secondary IDE------
Read DMA FIFO flush:          yes                 yes
End Sector FIFO flush:         no                  no
Prefetch Buffer:              yes                 yes
Post Write Buffer:            yes                 yes
Enabled:                      yes                 yes
Simplex only:                  no                  no
Cable Type:                   80w                 40w
-------------------drive0----drive1----drive2----drive3-----
Transfer Mode:       UDMA       PIO       DMA      UDMA
Address Setup:      120ns     120ns     120ns     120ns
Cmd Active:          90ns      90ns      90ns      90ns
Cmd Recovery:        30ns      30ns      30ns      30ns
Data Active:         90ns     330ns      90ns      90ns
Data Recovery:       30ns     270ns      30ns      30ns
Cycle Time:          22ns     600ns     120ns      60ns
Transfer Rate:   88.8MB/s   3.3MB/s  16.6MB/s  33.3MB/s
schlicht@bigboss:~> mount
/dev/hda5 on / type reiserfs (rw)
proc on /proc type proc (rw)
devpts on /dev/pts type devpts (rw,mode=0620,gid=5)
sysfs on /sys type sysfs (rw)
tmpfs on /tmp type tmpfs (rw)


Regards
   Thomas

P.S.: My hdparm version v5.4 sets the queuing depth only to 1 even if I 
provide e.g. '-Q8'...

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