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    SubjectRe: 2.6.33.3-rt16 Oops caused by umount
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    On Tue, 2010-04-27 at 20:56 +0200, Thomas Gleixner wrote:
    > On Tue, 27 Apr 2010, Xianghua Xiao wrote:
    >
    > cc'ed John
    >
    > > 2.6.33.2-rt13 worked fine, however on 2.6.33.3-rt16, when I do reboot, it oops:
    > >
    > > # reboot
    > > # Oops: Kernel access of bad area, sig: 11 [#1]
    > > PREEMPT 83xx Sys
    > > Modules linked in:
    > > NIP: c00efc68 LR: c00efc38 CTR: 00000000
    > > REGS: ce6e3dc0 TRAP: 0300 Not tainted (2.6.33.3-rt16)
    > > MSR: 00009032 <EE,ME,IR,DR> CR: 24000448 XER: 00000000
    > > DAR: 00000038, DSISR: 20000000
    > > TASK = cd89ccc0[1613] 'umount' THREAD: ce6e2000
    > > GPR00: 00000000 ce6e3e70 cd89ccc0 ce6e3ddc 22222222 00000000 ce6e3e24 ce6e3e04
    > > GPR08: 00008000 00000010 cdfa2130 cdfa26e0 44000442 100bbc1c 0fffd000 ffffffff
    > > GPR16: 00000001 00000000 007fff00 00000000 00000000 00000001 ce6e3eb8 00000021
    > > GPR24: 00000060 00000000 00000000 ceb94c40 00000000 ceb94cc0 c065781c ce6e3e70
    > > NIP [c00efc68] fs_may_remount_ro+0x6c/0xd8
    > > LR [c00efc38] fs_may_remount_ro+0x3c/0xd8
    > > Call Trace:
    > > [ce6e3e70] [c00efc38] fs_may_remount_ro+0x3c/0xd8 (unreliable)
    > > [ce6e3e90] [c00f1198] do_remount_sb+0x11c/0x164
    > > [ce6e3eb0] [c0113a3c] do_mount+0x538/0x86c
    > > [ce6e3f10] [c0113e30] sys_mount+0xc0/0x120
    > > [ce6e3f40] [c00178d8] ret_from_syscall+0x0/0x38
    > > --- Exception: c01 at 0xfe5f8c4
    > > LR = 0x10051b88
    > > Instruction dump:
    > > 38000000 817d00c0 3bbd00c0 60088000 814b0000 2f8a0000 419e0008 7c00522c
    > > 7f8be800 419e004c 812b000c 81290040 <80090028> 2f800000 419e0028 a009006e
    > > ---[ end trace 17c711f9d369c3a3 ]---

    Hey Xianghua,
    What filesystem was this on? And what architecture?

    thanks
    -john




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