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    SubjectRe: 2.5.1-pre5 not easy to boot with devfs
    Richard Gooch wrote:
    >
    > Pierre Rousselet writes:
    > > Richard Gooch wrote:
    > > > Indeed I do. Please Cc: me on devfs related stuff. And please apply
    > > > devfs-patch-v200, which fixes a stupid typo. I'd also be interested in
    > > > knowing the behaviour with 2.4.17-pre1.
    >
    > Did you apply devfs-patch-v200?
    >
    Well, I am now back with 2.4.16 and devfsd-1.3.18. Playing with devfs is
    a risky game.

    I applied devfs-patch-v200 against 2.5.1-pre5 :

    patching file linux/Documentation/filesystems/devfs/ChangeLog
    patching file linux/drivers/char/pty.c
    patching file linux/drivers/char/tty_io.c
    Hunk #1 succeeded at 1339 (offset -4 lines).
    patching file linux/fs/devfs/base.c
    patching file linux/include/linux/devfs_fs_kernel.h

    And I got an oops when booting with devfsd-1.3.20. Luckily, I get the
    same oops when booting without devfsd and starting it after loging in.
    Here it is

    ksymoops 2.4.3 on i686 2.5.1-pre5. Options used
    -V (default)
    -k /proc/ksyms (default)
    -l /proc/modules (default)
    -o /lib/modules/2.5.1-pre5/ (default)
    -m /usr/src/linux/System.map (default)

    Warning: You did not tell me where to find symbol information. I will
    assume that the log matches the kernel and modules that are running
    right now and I'll use the default options above for symbol resolution.
    If the current kernel and/or modules do not match the log, you can get
    more accurate output by telling me the kernel version and where to find
    map, modules, ksyms etc. ksymoops -h explains the options.

    Unable to handle kernel paging request at virtual address 5a5a5a5e
    c01516f9
    *pde = 00000000
    Oops: 0002
    CPU: 0
    EIP: 0010:[devfs_put+13/188] Not tainted
    EFLAGS: 00010206
    eax: 5a5a5a5a ebx: 5a5a5a5a ecx: 00000017 edx: 5a5a5a5a
    esi: 00000000 edi: 00000026 ebp: 00000000 esp: cf4f7f40
    ds: 0018 es: 0018 ss: 0018
    Process devfsd (pid: 167, stackpage=cf4f7000)
    Stack: 00000026 c015420c 5a5a5a5a cf7a25e4 ffffffea 00000000 00000420
    cfb80800
    c01e7280 cf33c240 5a5a5a5a 000003fa 00000000 00000000 00000001
    00000000
    cf4f6000 00000000 00000000 00000000 cf4f6000 c01e72ac c01e72ac
    c012f5e6
    Call Trace: [devfsd_read+964/972] [sys_read+150/204]
    [system_call+51/56]
    Code: ff 4b 04 0f 94 c0 84 c0 0f 84 9e 00 00 00 3b 1d 00 15 21 c0
    Using defaults from ksymoops -t elf32-i386 -a i386

    Code; 00000000 Before first symbol
    00000000 <_EIP>:
    Code; 00000000 Before first symbol
    0: ff 4b 04 decl 0x4(%ebx)
    Code; 00000002 Before first symbol
    3: 0f 94 c0 sete %al
    Code; 00000006 Before first symbol
    6: 84 c0 test %al,%al
    Code; 00000008 Before first symbol
    8: 0f 84 9e 00 00 00 je ac <_EIP+0xac> 000000ac Before
    first symbol
    Code; 0000000e Before first symbol
    e: 3b 1d 00 15 21 c0 cmp 0xc0211500,%ebx


    1 warning issued. Results may not be reliable.

    > > > and boot messages. And booting with
    > >
    > > Difficult, I have no log in this case. I don't see unusual message
    > > before the oops except :
    >
    > I need those boot messages.

    Here is a log of a successful boot with devfs-patch-v200 but without
    starting devfsd.

    Dec 1 18:47:20 milou kernel: Linux version 2.5.1-pre5 (root@milou) (gcc
    version 2.95.3 20010315 (release)) #3 sam déc 1 18:21:42 CET 2001
    Dec 1 18:47:20 milou kernel: BIOS-provided physical RAM map:
    Dec 1 18:47:20 milou kernel: BIOS-e820: 0000000000000000 -
    000000000009fc00 (usable)
    Dec 1 18:47:20 milou kernel: BIOS-e820: 000000000009fc00 -
    00000000000a0000 (reserved)
    Dec 1 18:47:20 milou kernel: BIOS-e820: 00000000000f0000 -
    0000000000100000 (reserved)
    Dec 1 18:47:20 milou kernel: BIOS-e820: 0000000000100000 -
    0000000010000000 (usable)
    Dec 1 18:47:20 milou kernel: BIOS-e820: 00000000ffff0000 -
    0000000100000000 (reserved)
    Dec 1 18:47:20 milou kernel: On node 0 totalpages: 65536
    Dec 1 18:47:20 milou kernel: zone(0): 4096 pages.
    Dec 1 18:47:20 milou kernel: zone(1): 61440 pages.
    Dec 1 18:47:20 milou kernel: zone(2): 0 pages.
    Dec 1 18:47:20 milou kernel: Kernel command line: vga=4
    root=/dev/discs/disc0/part2 ro mem=262144K
    Dec 1 18:47:20 milou kernel: Initializing CPU#0
    Dec 1 18:47:20 milou kernel: Detected 670.105 MHz processor.
    Dec 1 18:47:20 milou kernel: Console: colour VGA+ 80x30
    Dec 1 18:47:20 milou kernel: Calibrating delay loop... 1336.93 BogoMIPS
    Dec 1 18:47:20 milou kernel: Memory: 256424k/262144k available (733k
    kernel code, 5332k reserved, 222k data, 68k init, 0k highmem)
    Dec 1 18:47:20 milou kernel: Dentry-cache hash table entries: 32768
    (order: 6, 262144 bytes)
    Dec 1 18:47:20 milou kernel: Inode-cache hash table entries: 16384
    (order: 5, 131072 bytes)
    Dec 1 18:47:20 milou kernel: Mount-cache hash table entries: 4096
    (order: 3, 32768 bytes)
    Dec 1 18:47:20 milou kernel: Buffer-cache hash table entries: 16384
    (order: 4, 65536 bytes)
    Dec 1 18:47:20 milou kernel: Page-cache hash table entries: 65536
    (order: 6, 262144 bytes)
    Dec 1 18:47:20 milou kernel: CPU: Before vendor init, caps: 0383f9ff
    00000000 00000000, vendor = 0
    Dec 1 18:47:20 milou kernel: CPU: L1 I cache: 16K, L1 D cache: 16K
    Dec 1 18:47:20 milou kernel: CPU: L2 cache: 256K
    Dec 1 18:47:20 milou kernel: Intel machine check architecture
    supported.
    Dec 1 18:47:20 milou kernel: Intel machine check reporting enabled on
    CPU#0.
    Dec 1 18:47:20 milou kernel: CPU: After vendor init, caps: 0383f9ff
    00000000 00000000 00000000
    Dec 1 18:47:20 milou kernel: CPU: After generic, caps: 0383f9ff
    00000000 00000000 00000000
    Dec 1 18:47:20 milou kernel: CPU: Common caps: 0383f9ff
    00000000 00000000 00000000
    Dec 1 18:47:20 milou kernel: CPU: Intel Pentium III (Coppermine)
    stepping 01
    Dec 1 18:47:20 milou kernel: Enabling fast FPU save and restore...
    done.
    Dec 1 18:47:20 milou kernel: Enabling unmasked SIMD FPU exception
    support... done.
    Dec 1 18:47:20 milou kernel: Checking 'hlt' instruction... OK.
    Dec 1 18:47:20 milou kernel: POSIX conformance testing by UNIFIX
    Dec 1 18:47:20 milou kernel: mtrr: v1.40 (20010327) Richard Gooch
    (rgooch@atnf.csiro.au)
    Dec 1 18:47:20 milou kernel: mtrr: detected mtrr type: Intel
    Dec 1 18:47:20 milou kernel: PCI: PCI BIOS revision 2.10 entry at
    0xfb380, last bus=1
    Dec 1 18:47:20 milou kernel: PCI: Using configuration type 1
    Dec 1 18:47:20 milou kernel: PCI: Probing PCI hardware
    Dec 1 18:47:20 milou kernel: Unknown bridge resource 0: assuming
    transparent
    Dec 1 18:47:20 milou kernel: PCI: Using IRQ router PIIX [8086/7110] at
    00:07.0
    Dec 1 18:47:20 milou kernel: Limiting direct PCI/PCI transfers.
    Dec 1 18:47:20 milou kernel: Linux NET4.0 for Linux 2.4
    Dec 1 18:47:20 milou kernel: Based upon Swansea University Computer
    Society NET3.039
    Dec 1 18:47:20 milou kernel: apm: BIOS version 1.2 Flags 0x07 (Driver
    version 1.15)
    Dec 1 18:47:20 milou kernel: Starting kswapd
    Dec 1 18:47:20 milou kernel: BIO: pool of 256 setup, 14Kb (56
    bytes/bio)
    Dec 1 18:47:20 milou kernel: biovec: init pool 0, 1 entries, 12 bytes
    Dec 1 18:47:20 milou kernel: biovec: init pool 1, 4 entries, 48 bytes
    Dec 1 18:47:20 milou kernel: biovec: init pool 2, 16 entries, 192 bytes
    Dec 1 18:47:20 milou kernel: biovec: init pool 3, 64 entries, 768 bytes
    Dec 1 18:47:20 milou kernel: biovec: init pool 4, 128 entries, 1536
    bytes
    Dec 1 18:47:20 milou kernel: biovec: init pool 5, 256 entries, 3072
    bytes
    Dec 1 18:47:20 milou kernel: devfs: v1.2 (20011127) Richard Gooch
    (rgooch@atnf.csiro.au)
    Dec 1 18:47:20 milou kernel: devfs: boot_options: 0x1
    Dec 1 18:47:20 milou kernel: block: 256 slots per queue, batch=32
    Dec 1 18:47:20 milou kernel: Uniform Multi-Platform E-IDE driver
    Revision: 6.32
    Dec 1 18:47:20 milou kernel: ide: Assuming 33MHz system bus speed for
    PIO modes; override with idebus=xx
    Dec 1 18:47:20 milou kernel: PIIX4: IDE controller on PCI slot 00:07.1
    Dec 1 18:47:20 milou kernel: PIIX4: chipset revision 1
    Dec 1 18:47:20 milou kernel: PIIX4: not 100% native mode: will probe
    irqs later
    Dec 1 18:47:20 milou kernel: ide0: BM-DMA at 0xf000-0xf007, BIOS
    settings: hda:pio, hdb:pio
    Dec 1 18:47:20 milou kernel: ide1: BM-DMA at 0xf008-0xf00f, BIOS
    settings: hdc:pio, hdd:pio
    Dec 1 18:47:20 milou kernel: HPT366: onboard version of chipset, pin1=1
    pin2=2
    Dec 1 18:47:20 milou kernel: HPT366: IDE controller on PCI slot 00:13.0
    Dec 1 18:47:20 milou kernel: PCI: Found IRQ 11 for device 00:13.0
    Dec 1 18:47:20 milou kernel: PCI: Sharing IRQ 11 with 00:13.1
    Dec 1 18:47:20 milou kernel: HPT366: chipset revision 1
    Dec 1 18:47:20 milou kernel: HPT366: not 100% native mode: will probe
    irqs later
    Dec 1 18:47:20 milou kernel: ide2: BM-DMA at 0xd400-0xd407, BIOS
    settings: hde:pio, hdf:pio
    Dec 1 18:47:20 milou kernel: HPT366: IDE controller on PCI slot 00:13.1
    Dec 1 18:47:20 milou kernel: PCI: Found IRQ 11 for device 00:13.1
    Dec 1 18:47:20 milou kernel: PCI: Sharing IRQ 11 with 00:13.0
    Dec 1 18:47:20 milou kernel: HPT366: chipset revision 1
    Dec 1 18:47:20 milou kernel: HPT366: not 100% native mode: will probe
    irqs later
    Dec 1 18:47:20 milou kernel: ide3: BM-DMA at 0xe000-0xe007, BIOS
    settings: hdg:pio, hdh:pio
    Dec 1 18:47:20 milou kernel: hdc: CRD-8240B, ATAPI CD/DVD-ROM drive
    Dec 1 18:47:20 milou kernel: hde: ST310212A, ATA DISK drive
    Dec 1 18:47:20 milou kernel: hdg: SAMSUNG SV0322A, ATA DISK drive
    Dec 1 18:47:20 milou kernel: ide1 at 0x170-0x177,0x376 on irq 15
    Dec 1 18:47:20 milou kernel: ide2 at 0xcc00-0xcc07,0xd002 on irq 11
    Dec 1 18:47:20 milou kernel: ide3 at 0xd800-0xd807,0xdc02 on irq 11
    Dec 1 18:47:20 milou kernel: blk: queue c0227dd4, I/O limit 4095Mb
    (mask 0xffffffff)
    Dec 1 18:47:20 milou kernel: hde: 20005650 sectors (10243 MB) w/512KiB
    Cache, CHS=19846/16/63, UDMA(66)
    Dec 1 18:47:20 milou kernel: blk: queue c022814c, I/O limit 4095Mb
    (mask 0xffffffff)
    Dec 1 18:47:20 milou kernel: hdg: 6250608 sectors (3200 MB) w/478KiB
    Cache, CHS=11024/9/63, UDMA(33)
    Dec 1 18:47:20 milou kernel: Partition check:
    Dec 1 18:47:20 milou kernel: /dev/ide/host2/bus0/target0/lun0: [PTBL]
    [1245/255/63] p1 p2 p3 p4
    Dec 1 18:47:20 milou kernel: /dev/ide/host3/bus0/target0/lun0: p1
    Dec 1 18:47:20 milou kernel: Linux agpgart interface v0.99 (c) Jeff
    Hartmann
    Dec 1 18:47:20 milou kernel: agpgart: Maximum main memory to use for
    agp memory: 204M
    Dec 1 18:47:20 milou kernel: agpgart: Detected Intel 440BX chipset
    Dec 1 18:47:20 milou kernel: agpgart: AGP aperture is 256M @ 0xc0000000
    Dec 1 18:47:20 milou kernel: NET4: Linux TCP/IP 1.0 for NET4.0
    Dec 1 18:47:20 milou kernel: IP Protocols: ICMP, UDP, TCP, IGMP
    Dec 1 18:47:20 milou kernel: IP: routing cache hash table of 2048
    buckets, 16Kbytes
    Dec 1 18:47:20 milou kernel: TCP: Hash tables configured (established
    16384 bind 16384)
    Dec 1 18:47:20 milou kernel: NET4: Unix domain sockets 1.0/SMP for
    Linux NET4.0.
    Dec 1 18:47:20 milou kernel: VFS: Mounted root (ext2 filesystem)
    readonly.
    Dec 1 18:47:20 milou kernel: Mounted devfs on /dev
    Dec 1 18:47:20 milou kernel: Freeing unused kernel memory: 68k freed
    Dec 1 18:47:20 milou kernel: Adding Swap: 80316k swap-space (priority
    -1)
    Dec 1 18:47:20 milou kernel: Real Time Clock Driver v1.10e
    Dec 1 18:47:20 milou kernel: es1370: version v0.37 time 18:25:27 Dec 1
    2001
    Dec 1 18:47:20 milou kernel: PCI: Found IRQ 9 for device 00:09.0
    Dec 1 18:47:20 milou kernel: PCI: Sharing IRQ 9 with 00:07.2
    Dec 1 18:47:20 milou kernel: es1370: found adapter at io 0xc400 irq 9
    Dec 1 18:47:20 milou kernel: es1370: features: joystick off, line out,
    mic impedance 0
    Dec 1 18:47:20 milou kernel: Serial driver version 5.05c (2001-07-08)
    with MANY_PORTS SHARE_IRQ SERIAL_PCI enabled
    Dec 1 18:47:20 milou kernel: ttyS00 at 0x03f8 (irq = 4) is a 16550A
    Dec 1 18:47:20 milou kernel: ttyS01 at 0x02f8 (irq = 3) is a 16550A
    Dec 1 18:47:20 milou kernel: ne2k-pci.c:v1.02 10/19/2000 D. Becker/P.
    Gortmaker
    Dec 1 18:47:20 milou kernel:
    http://www.scyld.com/network/ne2k-pci.html
    Dec 1 18:47:20 milou kernel: PCI: Found IRQ 10 for device 00:0d.0
    Dec 1 18:47:20 milou kernel: eth0: RealTek RTL-8029 found at 0xc800,
    IRQ 10, 00:40:05:E4:DB:3F.
    Dec 1 18:47:20 milou kernel: hdc: ATAPI CD-ROM drive, 0kB Cache, DMA
    Dec 1 18:47:20 milou kernel: Uniform CD-ROM driver Revision: 3.12
    Dec 1 18:47:20 milou kernel: parport0: PC-style at 0x378, irq 7
    [PCSPP,TRISTATE]
    Dec 1 18:47:20 milou kernel: parport0: cpp_daisy: aa5500ff(98)
    Dec 1 18:47:20 milou kernel: parport0: assign_addrs: aa5500ff(98)
    Dec 1 18:47:20 milou kernel: parport0: Printer, HEWLETT-PACKARD DESKJET
    930C
    Dec 1 18:47:20 milou kernel: lp0: using parport0 (interrupt-driven).

    >
    > > none already mounted on /dev
    >
    > Edit your /etc/fstab and remove the line for devfs. You don't
    > need/want that if you have CONFIG_DEVFS_MOUNT=y.

    no problem

    >
    > > /dev is only a mountpoint on my system. I have no other fallback without
    > > devfs but a working kernel (thanksfully there are plenty).
    > >
    > > > "devfs=dall" is required as well.
    > >
    > > No option appended (no 'devfs='). grub.
    >
    > I know nothing about grub. Somehow, you need to pass "devfs=dall" to

    maybe I should pass an option but so far it was working without any, as
    you can see it in the command line from the log above.

    > the kernel when booting. And I need to see the boot messages when this
    > option is given to the kernel. If it's too verbose, you can try
    > "devfs=dreg,dunreg,dfree" instead. Copy the messages down by hand if
    > you need to, but I need to see them. Do yourself a favour and set up a
    > serial console so you can capture boot messages easily.

    I'll try my best, I like devfs.
    >
    > Also, make sure you are not using any proprietary drivers (like
    > NVidia). If you have such drivers, move them to another directory to

    no chance

    > prevent their being loaded. Even if you load but don't use such
    > drivers, they still make debugging information unreliable.
    >
    > I've had a look at the code, and I see no reason for devfs to fail in
    > this way, unless some driver is abusing it.

    I would suspect 1st devfsd. 2.4.16 is not happy at all with
    devfsd-1.3.20, even rxvt fails to find a terminal.

    >
    > Regards,
    >
    > Richard....
    > Permanent: rgooch@atnf.csiro.au
    > Current: rgooch@ras.ucalgary.ca

    Pierre
    --
    ------------------------------------------------
    Pierre Rousselet <pierre.rousselet@wanadoo.fr>
    ------------------------------------------------
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