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    SubjectRe: BUG: using rootfstype=ext4 causes oops
    On Thu, Apr 16, 2009 at 10:53:57AM -0400, Theodore Tso wrote:
    > OK, can you confirm that you tried using ext4 with either 2.6.29 or
    > 2.6.28, and it was working previously? That would make it a
    > regression which Rafael would track.

    I've tested this with a local GFS2 mount (which uses barriers too) and
    the same bug occurs. Apologies for making it seem like an ext4 bug. I'm
    currently waiting for a kernel to build with Bartlomiej's patch so we'll
    see how that goes.

    > Also, I'd suggest sending Bartolmiej details about what IDE controller
    > you have (the dmesg during a boot under ext3 or ext4 w/ barrier=0
    > would also be useful), so he can track it down. It might be specific
    > to a particular IDE controller/device, and not be a generalized IDE
    > problem, after all.

    00:0f.1 IDE interface [0101]: VIA Technologies, Inc. VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE [1106:0571] (rev 06) (prog-if 8a [Master SecP PriP])
    Subsystem: ASUSTeK Computer Inc. A7V600/K8V-X/A8V Deluxe motherboard [1043:80ed]
    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
    Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
    Latency: 32
    Interrupt: pin A routed to IRQ 20
    Region 0: [virtual] Memory at 000001f0 (32-bit, non-prefetchable) [size=8]
    Region 1: [virtual] Memory at 000003f0 (type 3, non-prefetchable) [size=1]
    Region 2: [virtual] Memory at 00000170 (32-bit, non-prefetchable) [size=8]
    Region 3: [virtual] Memory at 00000370 (type 3, non-prefetchable) [size=1]
    Region 4: I/O ports at fc00 [size=16]
    Capabilities: [c0] Power Management version 2
    Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
    Status: D0 PME-Enable- DSel=0 DScale=0 PME-
    Kernel driver in use: VIA_IDE

    > Anyway, I'll hand this bug off to Raefael's and/or Bartlomiej's very
    > capable hands, since I suspect you could also reproduce this using
    > rootfstype=ext3 rootfsflags=barrier=1, and that this is purely an IDE
    > driver problem.

    Thanks Ted.

    > P.S. Where in the documentation file do we have the mount option as
    > "barriers=0". I went looking for it, and I couldn't find it. What I
    > see is:
    > <snip>

    Further up in that file in the last paragraph of the 'Quick usage
    instructions' it says:

    [...]
    '-o barriers=[0|1]' mount option for both ext3 and ext4 filesystems
    [...]

    (I searched the file for barrier and it was the first chunk of text
    which matched.)

    --
    Andrew Price


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