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    SubjectRe: nfsd, v4: oops in find_acceptable_alias, ppc32 Linux, post-2.6.27-rc1
    Date
    Paul Collins <paul@burly.ondioline.org> writes:

    > "J. Bruce Fields" <bfields@fieldses.org> writes:
    >
    >> On Sun, Aug 03, 2008 at 12:03:18AM +1200, Paul Collins wrote:
    >>> 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.
    >>
    >> Without having really thought about this,
    >>
    >> 496d6c32d4d057cb44272d9bd587ff97d023ee92 "nfsd: fix spurious
    >> EACCESS in reconnect_path()"
    >>
    >> is one suspect; it might be worth checking whether the problem's
    >> reproduceable with that reverted. But I assume we're not so lucky as to
    >> have a 100% reproduceable problem here?
    >
    > Unknown. I've kicked off a fresh build. Here's hoping!

    I can trigger it reliably with a 2.6.26 client. I've also triggered it
    with 496d6c32d4d057cb44272d9bd587ff97d023ee92 reverted on the server.

    It's harder to trigger with 2.6.27-rc1+ but I managed to get an Oops
    on the fourth build after three successful builds on the NFS4 mount.

    One of the Oopses I got with 2.6.26 had a slightly different call trace:

    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: radeon drm snd_aoa_codec_tas snd_aoa_fabric_layout b43 mac80211 snd_aoa cfg80211 pcmcia snd_aoa_i2sbus snd_pcm_oss snd_pcm snd_page_alloc snd_aoa_soundbus yenta_socket rsrc_nonstatic pcmcia_core ssb uninorth_agp agpgart ehci_hcd ohci_hcd
    NIP: 00000000 LR: c0159bb0 CTR: 00000000
    REGS: c1f79ca0 TRAP: 0400 Not tainted (2.6.27-rc1-00158-g643fbd8)
    MSR: 40009032 <EE,ME,IR,DR> CR: 22002022 XER: 20000000
    TASK = c1ca5440[2321] 'nfsd' THREAD: c1f78000
    GPR00: 00000008 c1f79d50 c1ca5440 82002044 edda2c54 002d6642 002d6642 e05f26bc
    GPR08: ee126e60 00000000 eed7a600 c1f79d50 00000007 00000000 018985fc 01898404
    GPR16: 01898710 018c7894 c04b03f4 c04b03e0 c0173da0 c05f4e84 fffff000 00000001
    GPR24: c00c05dc 00000000 82002044 ef80cca0 edda2c54 ee10d020 c0437120 c1f79d50
    NIP [00000000] 0x0
    LR [c0159bb0] exportfs_decode_fh+0xa8/0x200
    Call Trace:
    [c1f79d50] [c0159b54] exportfs_decode_fh+0x4c/0x200 (unreliable)
    [c1f79e80] [c015d568] fh_verify+0x2e8/0x578
    [c1f79ed0] [c016b1ec] nfsd4_putfh+0x60/0x78
    [c1f79ef0] [c016afd0] nfsd4_proc_compound+0x1e4/0x34c
    [c1f79f30] [c015a060] nfsd_dispatch+0xfc/0x220
    [c1f79f50] [c0400c70] svc_process+0x3e4/0x6e8
    [c1f79f90] [c015a8bc] nfsd+0x1c4/0x294
    [c1f79fd0] [c0049e48] kthread+0x5c/0x9c
    [c1f79ff0] [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 3dfa6e448b5c7077 ]---

    --
    Paul Collins
    Wellington, New Zealand

    Dag vijandelijk luchtschip de huismeester is dood


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