Kamalesh Babulal wrote: > * Yinghai Lu [2008-12-19 13:02:40]: > > > I tried testing with today's tip/master and it can be reproduced with it. > > root (hd0,0) > Filesystem type is ext2fs, partition type 0x83 > kernel /vmlinuz-autotest root=/dev/mapper/VolGroup00-LogVol00 ro console=tty0 c > onsole=ttyS1,19200 selinux=no debug nmi_watchdog=1 unknown_nmi_panic=1 initcall > _debug earlyprintk=serial,ttyS1,19200 IDENT=1230036460 > [Linux-bzImage, setup=0x3000, size=0x273c10] > initrd /initrd-autotest > [Linux-initrd @ 0x37e5f000, 0x190980 bytes] > > Linux version 2.6.28-rc8-autotest-tip (root@bl6-13.ltc.austin.ibm.com) (gcc version 4.1.1 20060525 (Red Hat 4.1.1-1)) #1 SMP Tue Dec 23 06:37:41 CST 2008 > Command line: root=/dev/mapper/VolGroup00-LogVol00 ro console=tty0 console=ttyS1,19200 selinux=no debug nmi_watchdog=1 unknown_nmi_panic=1 initcall_debug earlyprintk=serial,ttyS1,19200 IDENT=1230036460 > Built 1 zonelists in Node order, mobility grouping on. Total pages: 256240 > Policy zone: DMA32 > Kernel command line: root=/dev/mapper/VolGroup00-LogVol00 ro console=tty0 console=ttyS1,19200 selinux=no debug nmi_watchdog=1 unknown_nmi_panic=1 initcall_debug earlyprintk=serial,ttyS1,19200 IDENT=1230036460 > Initializing CPU#0 > BUG: unable to handle kernel NULL pointer dereference at 0000000000000048 > IP: [] init_ISA_irqs+0x18/0x53 > PGD 0 please try attached debug patch. Thanks YH