Most recent kernel where this bug did not occur: 2.6.20
Distribution: Gentoo 2007
Hardware Environment:
  lspci output:
00:00.0 Host bridge: Silicon Integrated Systems [SiS] 661FX/M661FX/M661MX Host (rev 11)
00:01.0 PCI bridge: Silicon Integrated Systems [SiS] SiS AGP Port (virtual PCI-to-PCI bridge)
00:02.0 ISA bridge: Silicon Integrated Systems [SiS] SiS964 [MuTIOL Media IO] (rev 36)
00:02.5 IDE interface: Silicon Integrated Systems [SiS] 5513 [IDE] (rev 01)
00:02.7 Multimedia audio controller: Silicon Integrated Systems [SiS] AC'97 Sound Controller (rev a0)
00:03.0 USB Controller: Silicon Integrated Systems [SiS] USB 1.0 Controller (rev 0f)
00:03.1 USB Controller: Silicon Integrated Systems [SiS] USB 1.0 Controller (rev 0f)
00:03.2 USB Controller: Silicon Integrated Systems [SiS] USB 1.0 Controller (rev 0f)
00:03.3 USB Controller: Silicon Integrated Systems [SiS] USB 2.0 Controller
00:0e.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)
01:00.0 VGA compatible controller: nVidia Corporation NV34 [GeForce FX 5200] (rev a1)

Software Environment: 
  kernel: Linux tux 2.6.22 #2 Sun Aug 5 02:10:48 HKT 2007 i686 Intel(R) Pentium(R) 4 CPU 2.93GHz GenuineIntel GNU/Linux
  and lsmod:
Module                  Size  Used by
parport_pc             36516  0 
parport                36296  1 parport_pc
nvidia               7242420  18 
ata_generic             8068  0 
sis5513                13320  0 [permanent]
generic                 5380  0 [permanent]
psmouse                39568  0 
serio_raw               7556  0 
sr_mod                 16932  0 
cdrom                  37280  1 sr_mod
sd_mod                 29968  4 
ext3                  131080  0 
mbcache                 8836  1 ext3
jbd                    54056  1 ext3
scsi_wait_scan          1792  0 
sata_sis                9476  0 
pata_sis               14596  4 sata_sis
libata                126772  3 ata_generic,sata_sis,pata_sis
usbhid                 28768  0 
ohci_hcd               22276  0 
uhci_hcd               25872  0 
usb_storage            72128  0 
scsi_mod              145288  5 sr_mod,sd_mod,scsi_wait_scan,libata,usb_storage
hid                    27776  1 usbhid

Problem Description:the sis5513 and generic modules are permanent, I just want to builtin them in the kernel image, but if I rebuild it with all these modules options builtin, the new vmlinuz will panic, that it cannot find the block device. Indeed I have the IDE disk, but pata_sis saw it as a SCSI disk, thus it can work well with these modules, why it cannot work when they are in the vmlinuz?


Steps to reproduce: a normal sis5513 system with modules work well, but that vmlinuz rebuilt with all these module builtin would eventually panic.