[Bug 40286] [ia64] OOPS when accessing /sys/class/misc/efirtc/uvent

[Fabio Massimo Di Nitto]

Public bug reported:

Affects: linux-source-2.6.15 linux-image-2.6.15-20-itanium-smp (Ubuntu)
       Severity: Major
       Priority: (none set)
     Assignee: LaMont Jones
         Status: Unconfirmed


Description:
Unable to handle kernel paging request at virtual address 0000000700000000
sh[6236]: Oops 11012296146944 [4]
Modules linked in: efivars xfs exportfs reiserfs jfs ext3 jbd vfat fat ext2 e1000 usbserial usbhid usbkbd ehci_hcd ohcv

Pid: 6236, CPU 0, comm:                   sh
psr : 00001210085a6010 ifs : 800000000000048c ip  : [<a0000001002047b1>]    Not tainted
ip is at sysfs_open_file+0x271/0x740
unat: 0000000000000000 pfs : 000000000000048c rsc : 0000000000000003
rnat: 0000000000000000 bsps: 0000000000000000 pr  : 000000000001a959
ldrs: 0000000000000000 ccv : 0000000000000000 fpsr: 0009804c0270033f
csd : 0000000000000000 ssd : 0000000000000000
b0  : a000000100204610 b6  : a0000001000091e0 b7  : a0000001002021c0
f6  : 1003e0000000000000000 f7  : 1003e0000000000000080
f8  : 1003e0000000000000013 f9  : 000000000000000000000
f10 : 000000000000000000000 f11 : 000000000000000000000
r1  : a00000010090d6d0 r2  : e0000040fd757c34 r3  : e000000102be67f8
r8  : e0000040fdc64350 r9  : 0000000000000002 r10 : e0000040fdc70718
r11 : e0000040fd757cc8 r12 : e0000040f9727db0 r13 : e0000040f9720000
r14 : 0000000000000000 r15 : e0000040fdc706e8 r16 : 0000000700000000
r17 : e0000040fdc643c0 r18 : e0000040fdc70710 r19 : e0000040fdc706c8
r20 : e0000040fdc706a0 r21 : e000000102be6868 r22 : e000000102be67d0
r23 : a000000100204540 r24 : e0000040f9720d54 r25 : e0000040fdf7cf48
r26 : 0000000000000059 r27 : 0000000000000000 r28 : e0000040fea1cc10
r29 : a0000001000091e0 r30 : 0000000000000000 r31 : a00000010066fb80

Call Trace:
 [<a000000100013c80>] show_stack+0x80/0xa0
                                sp=e0000040f9727930 bsp=e0000040f9721148
 [<a0000001000145a0>] show_regs+0x900/0x940
                                sp=e0000040f9727b00 bsp=e0000040f97210f0
 [<a00000010003b2f0>] die+0x1b0/0x2a0
                                sp=e0000040f9727b10 bsp=e0000040f97210a8
 [<a000000100063580>] ia64_do_page_fault+0xc40/0xce0
                                sp=e0000040f9727b30 bsp=e0000040f9721050
 [<a00000010000c000>] ia64_leave_kernel+0x0/0x280
                                sp=e0000040f9727be0 bsp=e0000040f9721050
 [<a0000001002047b0>] sysfs_open_file+0x270/0x740
                                sp=e0000040f9727db0 bsp=e0000040f9720fe8
 [<a000000100153170>] __dentry_open+0x450/0x600
                                sp=e0000040f9727dc0 bsp=e0000040f9720f70
 [<a000000100153490>] nameidata_to_filp+0x90/0xc0
                                sp=e0000040f9727dc0 bsp=e0000040f9720f48
 [<a000000100153550>] filp_open+0x90/0xc0
                                sp=e0000040f9727dc0 bsp=e0000040f9720f18
 [<a000000100153860>] do_sys_open+0x80/0x1e0
                                sp=e0000040f9727e30 bsp=e0000040f9720ed0
 [<a000000100153a10>] sys_open+0x50/0x80
                                sp=e0000040f9727e30 bsp=e0000040f9720e78
 [<a00000010000be60>] ia64_ret_from_syscall+0x0/0x20
                                sp=e0000040f9727e30 bsp=e0000040f9720e78
 [<a000000000010620>] __start_ivt_text+0xffffffff00010620/0x400
                                sp=e0000040f9728000 bsp=e0000040f9720e78

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[ia64] OOPS when accessing /sys/class/misc/efirtc/uvent
https://launchpad.net/bugs/40286