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    SubjectRe: 2.5.1-pre5 not easy to boot with devfs
    Richard Gooch wrote:
    >
    > I should also point out that you need to compile with
    > CONFIG_DEVFS_DEBUG=y. Otherwise passing "devfs=dall" will have no
    > effect.

    2.5.1-pre5 with devfs-patch-v200
    CONFIG_DEVFS_FS=y
    CONFIG_DEVFS_MOUNT=y
    CONFIG_DEVFS_DEBUG=y
    CONFIG_DEBUG_KERNEL=y
    CONFIG_DEBUG_HIGHMEM=y
    CONFIG_DEBUG_SLAB=y
    CONFIG_DEBUG_IOVIRT=y
    CONFIG_MAGIC_SYSRQ=y
    CONFIG_DEBUG_SPINLOCK=y
    CONFIG_DEBUG_BUGVERBOSE=y

    The oops comes shortly after booting, loging in, starting devfsd-v1.3.20
    and playing with mc.
    The attached file is the same; it may be easier to read. The last line
    is the last entry of the log before <SysRq U>, <SysRq B>.


    Dec 2 07:39:29 milou kernel: devfs: devfs_unregister(): de->name: "s3"
    de: cf6ddf3c
    Dec 2 07:39:29 milou kernel: devfs: d_delete(): dentry: cf6c4c8c
    inode: cf6c1a0c devfs_entry: c14d0a94
    Dec 2 07:39:29 milou kernel: devfs: unlink(ttyp3)
    Dec 2 07:39:29 milou kernel: devfs: d_iput(): dentry: cf45d654 inode:
    cf378454 de: cf6ddd1c de->dentry: cf45d654
    Dec 2 07:39:29 milou kernel: devfs: devfs_put(ttyp3): de: cf6ddd1c,
    parent: c1419724 ""
    Dec 2 07:39:29 milou kernel: devfs: d_delete(): dropping negative
    dentry: cf45d654
    Dec 2 07:39:29 milou kernel: devfs: d_release(): dentry: cf45d654
    inode: 00000000
    Dec 2 07:39:29 milou kernel: devfs: d_delete(): dentry: cf45d5e0
    inode: cf37826c devfs_entry: cf6ddf3c
    Dec 2 07:39:29 milou kernel: devfs: d_iput(): dentry: cf45d5e0 inode:
    cf37826c de: cf6ddf3c de->dentry: cf45d5e0
    Dec 2 07:39:29 milou kernel: devfs: devfs_put(s3): de: cf6ddf3c,
    parent: c14d0874 "pty"
    Dec 2 07:39:29 milou kernel: devfs: d_release(): dentry: cf45d5e0
    inode: 00000000
    Dec 2 07:39:32 milou kernel: devfs: devfs_unregister(): de->name: "s2"
    de: cf6da18c
    Dec 2 07:39:32 milou kernel: devfs: d_delete(): dentry: cf6c4ba4
    inode: cf6c163c devfs_entry: c14d0a0c
    Dec 2 07:39:32 milou kernel: devfs: d_delete(): dentry: cf45d410
    inode: cf463bd4 devfs_entry: cf6da18c
    Dec 2 07:39:32 milou kernel: devfs: d_iput(): dentry: cf45d410 inode:
    cf463bd4 de: cf6da18c de->dentry: cf45d410
    Dec 2 07:39:32 milou kernel: devfs: d_release(): dentry: cf45d410
    inode: 00000000
    Dec 2 07:39:32 milou kernel: devfs: devfs_put(s2): de: cf6da18c,
    parent: c14d0874 "pty"
    Dec 2 07:39:32 milou kernel: Unable to handle kernel paging request at
    virtual address 5a5a5a5e
    Dec 2 07:39:32 milou kernel: printing eip:
    Dec 2 07:39:32 milou kernel: c01516f9
    Dec 2 07:39:32 milou kernel: *pde = 00000000
    Dec 2 07:39:32 milou kernel: Oops: 0002
    Dec 2 07:39:32 milou kernel: CPU: 0
    Dec 2 07:39:32 milou kernel: EIP: 0010:[devfs_put+13/296] Not
    tainted
    Dec 2 07:39:32 milou kernel: EFLAGS: 00010206
    Dec 2 07:39:32 milou kernel: eax: 5a5a5a5a ebx: 5a5a5a5a ecx:
    00000001 edx: 5a5a5a5a
    Dec 2 07:39:32 milou kernel: esi: 00000000 edi: 00000027 ebp:
    00000000 esp: cf657f40
    Dec 2 07:39:32 milou kernel: ds: 0018 es: 0018 ss: 0018
    Dec 2 07:39:32 milou kernel: Process devfsd-new (pid: 130,
    stackpage=cf657000)
    Dec 2 07:39:32 milou kernel: Stack: 00000027 c015465c 5a5a5a5a cf978484
    ffffffea 00000000 00000420 cfb97800
    Dec 2 07:39:32 milou kernel: c01e7f40 cf4fc224 5a5a5a5a 000003f9
    00000000 00000000 00000001 00000000
    Dec 2 07:39:32 milou kernel: cf656000 00000000 00000000 00000000
    cf656000 c01e7f6c c01e7f6c c012f5e6
    Dec 2 07:39:32 milou kernel: Call Trace: [devfsd_read+856/976]
    [sys_read+150/204] [system_call+51/56]
    Dec 2 07:39:32 milou kernel:
    Dec 2 07:39:32 milou kernel: Code: ff 4b 04 0f 94 c0 84 c0 0f 84 09 01
    00 00 3b 1d 00 15 21 c0
    Dec 2 07:39:39 milou kernel: devfs: devfs_unregister(): de->name: "s1"
    de: cf6da3ac
    Dec 2 07:39:39 milou kernel: devfs: d_delete(): dentry: cf6c4abc
    inode: cf6c126c devfs_entry: c14d0984
    Dec 2 07:39:39 milou kernel: devfs: d_delete(): dentry: cf45d240
    inode: cf46361c devfs_entry: cf6da3ac
    Dec 2 07:39:39 milou kernel: devfs: d_iput(): dentry: cf45d240 inode:
    cf46361c de: cf6da3ac de->dentry: cf45d240
    Dec 2 07:39:39 milou kernel: devfs: d_release(): dentry: cf45d240
    inode: 00000000
    Dec 2 07:39:42 milou kernel: devfs: d_delete(): dentry: cff25294
    inode: cff2122c devfs_entry: c14d512c
    Dec 2 07:39:42 milou kernel: devfs: d_delete(): dentry: cf6cbe3c
    inode: cf6c50a4 devfs_entry: c15d45ac
    Dec 2 07:39:42 milou kernel: devfs: devfs_unregister(): de->name: "s0"
    de: cf6da5cc
    Dec 2 07:39:42 milou kernel: devfs: d_delete(): dentry: cf6c49d4
    inode: cf6c2dbc devfs_entry: c14d08fc
    Dec 2 07:39:42 milou kernel: devfs: d_delete(): dentry: cf620d00
    inode: cf52824c devfs_entry: cf6da5cc
    Dec 2 07:39:42 milou kernel: devfs: d_iput(): dentry: cf620d00 inode:
    cf52824c de: cf6da5cc de->dentry: cf620d00
    Dec 2 07:39:42 milou kernel: devfs: d_release(): dentry: cf620d00
    inode: 00000000
    Dec 2 07:39:56 milou kernel: devfs: d_delete(): dentry: cf6cbeb0
    inode: cf6c528c devfs_entry: cf6c625c
    Dec 2 07:39:56 milou kernel: devfs: lookup(ptmx): dentry: cf620878
    parent: c1419724 by: "mc"



    --
    ------------------------------------------------
    Pierre Rousselet <pierre.rousselet@wanadoo.fr>
    ------------------------------------------------Dec 2 07:39:29 milou kernel: devfs: devfs_unregister(): de->name: "s3" de: cf6ddf3c
    Dec 2 07:39:29 milou kernel: devfs: d_delete(): dentry: cf6c4c8c inode: cf6c1a0c devfs_entry: c14d0a94
    Dec 2 07:39:29 milou kernel: devfs: unlink(ttyp3)
    Dec 2 07:39:29 milou kernel: devfs: d_iput(): dentry: cf45d654 inode: cf378454 de: cf6ddd1c de->dentry: cf45d654
    Dec 2 07:39:29 milou kernel: devfs: devfs_put(ttyp3): de: cf6ddd1c, parent: c1419724 ""
    Dec 2 07:39:29 milou kernel: devfs: d_delete(): dropping negative dentry: cf45d654
    Dec 2 07:39:29 milou kernel: devfs: d_release(): dentry: cf45d654 inode: 00000000
    Dec 2 07:39:29 milou kernel: devfs: d_delete(): dentry: cf45d5e0 inode: cf37826c devfs_entry: cf6ddf3c
    Dec 2 07:39:29 milou kernel: devfs: d_iput(): dentry: cf45d5e0 inode: cf37826c de: cf6ddf3c de->dentry: cf45d5e0
    Dec 2 07:39:29 milou kernel: devfs: devfs_put(s3): de: cf6ddf3c, parent: c14d0874 "pty"
    Dec 2 07:39:29 milou kernel: devfs: d_release(): dentry: cf45d5e0 inode: 00000000
    Dec 2 07:39:32 milou kernel: devfs: devfs_unregister(): de->name: "s2" de: cf6da18c
    Dec 2 07:39:32 milou kernel: devfs: d_delete(): dentry: cf6c4ba4 inode: cf6c163c devfs_entry: c14d0a0c
    Dec 2 07:39:32 milou kernel: devfs: d_delete(): dentry: cf45d410 inode: cf463bd4 devfs_entry: cf6da18c
    Dec 2 07:39:32 milou kernel: devfs: d_iput(): dentry: cf45d410 inode: cf463bd4 de: cf6da18c de->dentry: cf45d410
    Dec 2 07:39:32 milou kernel: devfs: d_release(): dentry: cf45d410 inode: 00000000
    Dec 2 07:39:32 milou kernel: devfs: devfs_put(s2): de: cf6da18c, parent: c14d0874 "pty"
    Dec 2 07:39:32 milou kernel: Unable to handle kernel paging request at virtual address 5a5a5a5e
    Dec 2 07:39:32 milou kernel: printing eip:
    Dec 2 07:39:32 milou kernel: c01516f9
    Dec 2 07:39:32 milou kernel: *pde = 00000000
    Dec 2 07:39:32 milou kernel: Oops: 0002
    Dec 2 07:39:32 milou kernel: CPU: 0
    Dec 2 07:39:32 milou kernel: EIP: 0010:[devfs_put+13/296] Not tainted
    Dec 2 07:39:32 milou kernel: EFLAGS: 00010206
    Dec 2 07:39:32 milou kernel: eax: 5a5a5a5a ebx: 5a5a5a5a ecx: 00000001 edx: 5a5a5a5a
    Dec 2 07:39:32 milou kernel: esi: 00000000 edi: 00000027 ebp: 00000000 esp: cf657f40
    Dec 2 07:39:32 milou kernel: ds: 0018 es: 0018 ss: 0018
    Dec 2 07:39:32 milou kernel: Process devfsd-new (pid: 130, stackpage=cf657000)
    Dec 2 07:39:32 milou kernel: Stack: 00000027 c015465c 5a5a5a5a cf978484 ffffffea 00000000 00000420 cfb97800
    Dec 2 07:39:32 milou kernel: c01e7f40 cf4fc224 5a5a5a5a 000003f9 00000000 00000000 00000001 00000000
    Dec 2 07:39:32 milou kernel: cf656000 00000000 00000000 00000000 cf656000 c01e7f6c c01e7f6c c012f5e6
    Dec 2 07:39:32 milou kernel: Call Trace: [devfsd_read+856/976] [sys_read+150/204] [system_call+51/56]
    Dec 2 07:39:32 milou kernel:
    Dec 2 07:39:32 milou kernel: Code: ff 4b 04 0f 94 c0 84 c0 0f 84 09 01 00 00 3b 1d 00 15 21 c0
    Dec 2 07:39:39 milou kernel: devfs: devfs_unregister(): de->name: "s1" de: cf6da3ac
    Dec 2 07:39:39 milou kernel: devfs: d_delete(): dentry: cf6c4abc inode: cf6c126c devfs_entry: c14d0984
    Dec 2 07:39:39 milou kernel: devfs: d_delete(): dentry: cf45d240 inode: cf46361c devfs_entry: cf6da3ac
    Dec 2 07:39:39 milou kernel: devfs: d_iput(): dentry: cf45d240 inode: cf46361c de: cf6da3ac de->dentry: cf45d240
    Dec 2 07:39:39 milou kernel: devfs: d_release(): dentry: cf45d240 inode: 00000000
    Dec 2 07:39:42 milou kernel: devfs: d_delete(): dentry: cff25294 inode: cff2122c devfs_entry: c14d512c
    Dec 2 07:39:42 milou kernel: devfs: d_delete(): dentry: cf6cbe3c inode: cf6c50a4 devfs_entry: c15d45ac
    Dec 2 07:39:42 milou kernel: devfs: devfs_unregister(): de->name: "s0" de: cf6da5cc
    Dec 2 07:39:42 milou kernel: devfs: d_delete(): dentry: cf6c49d4 inode: cf6c2dbc devfs_entry: c14d08fc
    Dec 2 07:39:42 milou kernel: devfs: d_delete(): dentry: cf620d00 inode: cf52824c devfs_entry: cf6da5cc
    Dec 2 07:39:42 milou kernel: devfs: d_iput(): dentry: cf620d00 inode: cf52824c de: cf6da5cc de->dentry: cf620d00
    Dec 2 07:39:42 milou kernel: devfs: d_release(): dentry: cf620d00 inode: 00000000
    Dec 2 07:39:56 milou kernel: devfs: d_delete(): dentry: cf6cbeb0 inode: cf6c528c devfs_entry: cf6c625c
    Dec 2 07:39:56 milou kernel: devfs: lookup(ptmx): dentry: cf620878 parent: c1419724 by: "mc"
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