NULL pointer dereference when trying to mount nfs-root using 2.4.19-pre8

[John Bäckstrand]

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I have been playing around with nfs-root the last
couple of days, using 2.2.x kernels on the bootfloppy.
I only have 16mb ram in the diskless box, so I had to
compile a kernel with NBD to use for swap. I didnt get
this to work with 2.2 kernels, so I tried building
2.4.19-pre8. (Which I btw had to patch in nfsroot.c to
get compiled, I know this is known though)

I am _not_ using bootp/rarp/dhcp, but rather an ip on
the commandline to the kernel using lilo. I tried
configuring the kernel both with rarp support and
without.

Anyway, right after printing the line "NET4: Unix
domain sockets ..." it Oopses, saying "cant handle NULL
pointer dereference at " and "process swapper (pid 1,
stackpage=c000b000)

Then I also get "Kernel panic: Trying to kill init"

My 3c509 is up, the kernel prints "short UDP packet
recevied" every now and then if I let the box be up, I
can even ping the box after this Oops.

Any ideas about this?

---
John Bäckstrand

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CONFIG_X86_XADD=3Dy=0A=
CONFIG_X86_BSWAP=3Dy=0A=
CONFIG_X86_POPAD_OK=3Dy=0A=
# CONFIG_RWSEM_GENERIC_SPINLOCK is not set=0A=
CONFIG_RWSEM_XCHGADD_ALGORITHM=3Dy=0A=
CONFIG_X86_L1_CACHE_SHIFT=3D4=0A=
CONFIG_X86_USE_STRING_486=3Dy=0A=
CONFIG_X86_ALIGNMENT_16=3Dy=0A=
CONFIG_X86_PPRO_FENCE=3Dy=0A=
# CONFIG_X86_MCE is not set=0A=
# CONFIG_TOSHIBA is not set=0A=
# CONFIG_I8K is not set=0A=
# CONFIG_MICROCODE is not set=0A=
# CONFIG_X86_MSR is not set=0A=
# CONFIG_X86_CPUID is not set=0A=
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CONFIG_SYSCTL=3Dy=0A=
CONFIG_KCORE_ELF=3Dy=0A=
# CONFIG_KCORE_AOUT is not set=0A=
CONFIG_BINFMT_AOUT=3Dm=0A=
CONFIG_BINFMT_ELF=3Dy=0A=
CONFIG_BINFMT_MISC=3Dm=0A=
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CONFIG_BLK_DEV_FD=3Dy=0A=
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# CONFIG_PARIDE is not set=0A=
# CONFIG_BLK_CPQ_DA is not set=0A=
# CONFIG_BLK_CPQ_CISS_DA is not set=0A=
# CONFIG_CISS_SCSI_TAPE is not set=0A=
# CONFIG_BLK_DEV_DAC960 is not set=0A=
# CONFIG_BLK_DEV_UMEM is not set=0A=
CONFIG_BLK_DEV_LOOP=3Dy=0A=
CONFIG_BLK_DEV_NBD=3Dm=0A=
CONFIG_BLK_DEV_RAM=3Dm=0A=
CONFIG_BLK_DEV_RAM_SIZE=3D4096=0A=
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# CONFIG_NETFILTER is not set=0A=
# CONFIG_FILTER is not set=0A=
CONFIG_UNIX=3Dy=0A=
CONFIG_INET=3Dy=0A=
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# CONFIG_HFS_FS is not set=0A=
# CONFIG_BFS_FS is not set=0A=
CONFIG_EXT3_FS=3Dm=0A=
CONFIG_JBD=3Dm=0A=
# CONFIG_JBD_DEBUG is not set=0A=
# CONFIG_FAT_FS is not set=0A=
# CONFIG_MSDOS_FS is not set=0A=
# CONFIG_UMSDOS_FS is not set=0A=
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# CONFIG_CRAMFS is not set=0A=
# CONFIG_TMPFS is not set=0A=
CONFIG_RAMFS=3Dy=0A=
# CONFIG_ISO9660_FS is not set=0A=
# CONFIG_JOLIET is not set=0A=
# CONFIG_ZISOFS is not set=0A=
CONFIG_MINIX_FS=3Dm=0A=
# CONFIG_VXFS_FS is not set=0A=
# CONFIG_NTFS_FS is not set=0A=
# CONFIG_NTFS_RW is not set=0A=
# CONFIG_HPFS_FS is not set=0A=
CONFIG_PROC_FS=3Dy=0A=
# CONFIG_DEVFS_FS is not set=0A=
# CONFIG_DEVFS_MOUNT is not set=0A=
# CONFIG_DEVFS_DEBUG is not set=0A=
CONFIG_DEVPTS_FS=3Dy=0A=
# CONFIG_QNX4FS_FS is not set=0A=
# CONFIG_QNX4FS_RW is not set=0A=
# CONFIG_ROMFS_FS is not set=0A=
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# CONFIG_SYSV_FS is not set=0A=
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# CONFIG_UDF_RW is not set=0A=
# CONFIG_UFS_FS is not set=0A=
# CONFIG_UFS_FS_WRITE is not set=0A=
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# Network File Systems=0A=
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# CONFIG_CODA_FS is not set=0A=
# CONFIG_INTERMEZZO_FS is not set=0A=
CONFIG_NFS_FS=3Dy=0A=
CONFIG_NFS_V3=3Dy=0A=
CONFIG_ROOT_NFS=3Dy=0A=
# CONFIG_NFSD is not set=0A=
# CONFIG_NFSD_V3 is not set=0A=
CONFIG_SUNRPC=3Dy=0A=
CONFIG_LOCKD=3Dy=0A=
CONFIG_LOCKD_V4=3Dy=0A=
# CONFIG_SMB_FS is not set=0A=
# CONFIG_NCP_FS is not set=0A=
# CONFIG_NCPFS_PACKET_SIGNING is not set=0A=
# CONFIG_NCPFS_IOCTL_LOCKING is not set=0A=
# CONFIG_NCPFS_STRONG is not set=0A=
# CONFIG_NCPFS_NFS_NS is not set=0A=
# CONFIG_NCPFS_OS2_NS is not set=0A=
# CONFIG_NCPFS_SMALLDOS is not set=0A=
# CONFIG_NCPFS_NLS is not set=0A=
# CONFIG_NCPFS_EXTRAS is not set=0A=
# CONFIG_ZISOFS_FS is not set=0A=
# CONFIG_ZLIB_FS_INFLATE is not set=0A=
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# Partition Types=0A=
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# CONFIG_PARTITION_ADVANCED is not set=0A=
CONFIG_MSDOS_PARTITION=3Dy=0A=
# CONFIG_SMB_NLS is not set=0A=
# CONFIG_NLS is not set=0A=
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#=0A=
# Console drivers=0A=
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CONFIG_VGA_CONSOLE=3Dy=0A=
# CONFIG_VIDEO_SELECT is not set=0A=
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#=0A=
# Sound=0A=
#=0A=
CONFIG_SOUND=3Dy=0A=
# CONFIG_SOUND_BT878 is not set=0A=
# CONFIG_SOUND_CMPCI is not set=0A=
# CONFIG_SOUND_EMU10K1 is not set=0A=
# CONFIG_MIDI_EMU10K1 is not set=0A=
# CONFIG_SOUND_FUSION is not set=0A=
# CONFIG_SOUND_CS4281 is not set=0A=
# CONFIG_SOUND_ES1370 is not set=0A=
# CONFIG_SOUND_ES1371 is not set=0A=
# CONFIG_SOUND_ESSSOLO1 is not set=0A=
# CONFIG_SOUND_MAESTRO is not set=0A=
# CONFIG_SOUND_MAESTRO3 is not set=0A=
# CONFIG_SOUND_ICH is not set=0A=
# CONFIG_SOUND_RME96XX is not set=0A=
# CONFIG_SOUND_SONICVIBES is not set=0A=
# CONFIG_SOUND_TRIDENT is not set=0A=
# CONFIG_SOUND_MSNDCLAS is not set=0A=
# CONFIG_SOUND_MSNDPIN is not set=0A=
# CONFIG_SOUND_VIA82CXXX is not set=0A=
# CONFIG_MIDI_VIA82CXXX is not set=0A=
CONFIG_SOUND_OSS=3Dy=0A=
# CONFIG_SOUND_TRACEINIT is not set=0A=
# CONFIG_SOUND_DMAP is not set=0A=
# CONFIG_SOUND_SGALAXY is not set=0A=
# CONFIG_SOUND_ADLIB is not set=0A=
# CONFIG_SOUND_ACI_MIXER is not set=0A=
# CONFIG_SOUND_CS4232 is not set=0A=
# CONFIG_SOUND_SSCAPE is not set=0A=
# CONFIG_SOUND_GUS is not set=0A=
# CONFIG_SOUND_VMIDI is not set=0A=
# CONFIG_SOUND_TRIX is not set=0A=
# CONFIG_SOUND_MSS is not set=0A=
# CONFIG_SOUND_MPU401 is not set=0A=
# CONFIG_SOUND_NM256 is not set=0A=
# CONFIG_SOUND_MAD16 is not set=0A=
# CONFIG_SOUND_PAS is not set=0A=
# CONFIG_PAS_JOYSTICK is not set=0A=
# CONFIG_SOUND_PSS is not set=0A=
CONFIG_SOUND_SB=3Dm=0A=
# CONFIG_SOUND_AWE32_SYNTH is not set=0A=
# CONFIG_SOUND_WAVEFRONT is not set=0A=
# CONFIG_SOUND_MAUI is not set=0A=
# CONFIG_SOUND_YM3812 is not set=0A=
# CONFIG_SOUND_OPL3SA1 is not set=0A=
# CONFIG_SOUND_OPL3SA2 is not set=0A=
# CONFIG_SOUND_YMFPCI is not set=0A=
# CONFIG_SOUND_YMFPCI_LEGACY is not set=0A=
# CONFIG_SOUND_UART6850 is not set=0A=
# CONFIG_SOUND_AEDSP16 is not set=0A=
# CONFIG_SOUND_TVMIXER is not set=0A=
=0A=
#=0A=
# USB support=0A=
#=0A=
# CONFIG_USB is not set=0A=
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#=0A=
# Bluetooth support=0A=
#=0A=
# CONFIG_BLUEZ is not set=0A=
=0A=
#=0A=
# Kernel hacking=0A=
#=0A=
# CONFIG_DEBUG_KERNEL is not set=0A=

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