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    Subjectnfsd, v4: oops in find_acceptable_alias, ppc32 Linux, post-2.6.27-rc1
    Date
    I just got the oops below on a ppc32 NFS4 server.  I was cross-compiling
    Linux with an amd64 client at the time. The server is running Linus's
    tree as of 94ad374a0751f40d25e22e036c37f7263569d24c, the client is
    running 2.6.26.

    The server's kernel was cross-compiled with gcc 4.2.4-3 and binutils
    2.18.50.20080610-1, both built from the Debian sources following their
    toolchain-building procedures.

    Annoyingly, I can't kill two of the client processes:

    1 11634 11634 977 ? -1 D 1000 0:00 make ARCH=powerpc CROSS_COMPILE=powerpc-linux-gnu- oldconfig vmlinux modules
    1 23887 11634 977 ? -1 D 1000 0:00 [powerpc-linux-g]

    Here's the oops. The instruction dump really was all Xes.

    Unable to handle kernel paging request for instruction fetch
    Faulting instruction address: 0x00000000
    Oops: Kernel access of bad area, sig: 11 [#1]
    PowerMac
    Modules linked in: snd_aoa_codec_tas snd_aoa_fabric_layout snd_aoa snd_aoa_i2sbus snd_aoa_soundbus radeon drm b43 mac80211 cfg80211 pcmcia snd_pcm_oss snd_pcm snd_page_alloc yenta_socket rsrc_nonstatic pcmcia_core ssb uninorth_agp agpgart ehci_hcd ohci_hcd [last unloaded: snd_aoa_soundbus]
    NIP: 00000000 LR: c0159a44 CTR: 00000000
    REGS: c1d81c70 TRAP: 0400 Not tainted (2.6.27-rc1-00158-g643fbd8)
    MSR: 40009032 <EE,ME,IR,DR> CR: 82002024 XER: 20000000
    TASK = c1c7b210[2306] 'nfsd' THREAD: c1d80000
    GPR00: c0159bcc c1d81d20 c1c7b210 82002044 c2e538d4 82002044 002e499d f92d835f
    GPR08: 00000000 c2e55ac4 c2e55adc c1d81d50 82002024 00000000 018985fc 01898404
    GPR16: 01898710 018c7894 c04b03f4 c04b03e0 c0173da0 c05f4e84 fffff000 00000001
    GPR24: c00c05dc 00000000 82002044 00000000 c2e538d4 c2e538d4 c0437120 c1d81d20
    NIP [00000000] 0x0
    LR [c0159a44] find_acceptable_alias+0x44/0x108
    Call Trace:
    [c1d81d20] [c00cbab8] exportfs_d_alloc+0x40/0x70 (unreliable)
    [c1d81d50] [c0159bcc] exportfs_decode_fh+0xc4/0x200
    [c1d81e80] [c015d568] fh_verify+0x2e8/0x578
    [c1d81ed0] [c016b1ec] nfsd4_putfh+0x60/0x78
    [c1d81ef0] [c016afd0] nfsd4_proc_compound+0x1e4/0x34c
    [c1d81f30] [c015a060] nfsd_dispatch+0xfc/0x220
    [c1d81f50] [c0400c70] svc_process+0x3e4/0x6e8
    [c1d81f90] [c015a8bc] nfsd+0x1c4/0x294
    [c1d81fd0] [c0049e48] kthread+0x5c/0x9c
    [c1d81ff0] [c00125c0] kernel_thread+0x44/0x60
    Instruction dump:
    XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
    XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
    ---[ end trace 88de9451d0d3e759 ]---

    --
    Paul Collins
    Wellington, New Zealand

    Dag vijandelijk luchtschip de huismeester is dood


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