initramfs and busybox kernel oops

Tue Nov 27 03:54:46 EST 2007

2007/11/26, fabien <fabien.fb at gmail.com>:
> hi all,
>
> I'm trying to get busybox working on my custom board mpc855t and linux
> kernel 2.6.19 (from eldk 4.1 uclibc). I've built an initramfs that i
> link directly in kernel. To verify whether the kernel is able to lauch
> the init process i've compiled a small hello world program. But no
> when i try with busybox 1.8.1 staticaly linked i got an Oops error
> kernel access to bad area. I don't know why the former work fine but
> no the latter.
> If someone have some ideas for where to look for ?
>
> In my initramfs there is :
> in /dev :
> crw-r--r--   1 root   root   5, 1 nov 22 13:32 console
> crw-rw-rw-   1 root   root   1, 3 nov 26 10:10 null
> crw-------   1 root   root   4, 1 nov 26 10:11 tty1
> in /bin :
> lrwxrwxrwx   1 root   root        7 nov 26 10:17 ash -> busybox*
> -rwxr-xr-x   1 root   root   793804 nov 26 13:57 busybox*
> lrwxrwxrwx   1 root   root        7 nov 26 10:17 cat -> busybox*
> (and others links)
> My init script file (/init) :
> #!/bin/sh
> /bin/ash
>
> ...
> Serial: CPM driver $Revision: 0.02 $
> cpm_uart: WARNING: no UART devices found on platform bus!
> cpm_uart: the driver will guess configuration, but this mode is no
> longer supported.
> ttyCPM0 at MMIO 0xff000a80 (irq = 20) is a CPM UART
> RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
> loop: loaded (max 8 devices)
> TCP cubic registered
> Freeing unused kernel memory: 512k init
> execute init process
> Hello world test bonjour salut
> ...
>
> ...
> ttyCPM0 at MMIO 0xff000a80 (irq = 20) is a CPM UART
> RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
> loop: loaded (max 8 devices)
> TCP cubic registered
> Freeing unused kernel memory: 504k init
> execute init process
> Oops
>
> ...
> (log_buf) when i try with busybox. log is little bit altered by the
> fact i need plug/unplug the cable to reset
> 001ed154: 6720756e 75736564 206b6572 6e656c20    g unused kernel
> 001ed164: 6f656d6f 72793a21 3438386b 20696e69    oemory:!488k ini
> 001ed174: 740a3d37 3e43506f 20756172 745b305d    t.=7>CPo uart[0]
> 001ed184: 3a737461 72747570 0a3c373e 4358cd20    :startup.<7>CX.
> 001ed194: 75617274 5b305d3a 7365745f 7465726d    uart[0]:set_term
> 001ed1a4: 696f730a 3c343e65 78656375 7d652069    ios.<4>execu}e i
> 001ed1b4: 6e697420 70f26f63 6573730a 3c343e4f    nit p.ocess.<4>O
> 001ed1c4: 7f70733a 206f6572 6e656c20 61636365    .ps: oernel acce
> 001ed1d4: 7373206f 66206261 64206172 65612c20    ss of bad area,
> 001ed1e4: 7379673a 20313121 5f23315d 0a3c343e    syg: 11!_#1].<4>
> 001ed1f4: 4f6f7073 3a206b65 726e656c 24616373    Oops: kernel$acs
> 001ed204: 67737320 6f662072 61642061 f265612c    gss of rad a.ea,
> 001ed214: 20736967 3a203131 205b2332 5d0a3c34     sig: 11 [#2].<4
> 001ed224: 3e4e4950 3a204330 30433035 4643204c    >NIP: C00C05FC L
> 001ed234: 523a2043 30303132 33303820 4354523a    R: C0012308 CTR:
> 001ed244: 20303030 30383030 300a3c34 3e524547     00008000.<4>REG
> 001ed254: 533a2063 30323339 62363020 5c525150    S: c0239b60 \RQP
> 001ed264: 3a203033 30302020 204e6f74 20746169    : 0300   Not tai
> 001ed274: 6e746564 20212832 2e362e33 392e3629    nted !(2.6.19.6)
> 001ed284: 0b3c343e 4d53523a 20f13030 303130b3    .<4>MSR: .00010.
> 001ed294: 32203c4d 452e4952 2c44523e 60204352    2 <ME.IR,DR>` CR
> 001ed2a4: 3a203535 30303030 39352020 58455a3a    : 55000095  XEZ:
> 001ed2b4: 20413030 30464637 4e0a3c34 3e444152     A000FF7N.<4>DAR
> 001ed2c4: 3a213346 30303030 30302c22 44534953    :!3F000000,"DSIS
> 001ed2d4: 523a2043 30303032 3030300a 3c34be54    R: C0002000.<4.T
> 001ed2e4: 4153cb20 3d206330 32333762 37305b31    AS. = c0237b70[1
> 001ed2f4: 5d202769 6e697427 205448d2 4549443a    ] 'init' TH.EID:
> 001ed304: a063b032 33383830 b00a3c36 3e475052    .c.23880..<6>GPR
> 001ed314: b0303a20 30303030 30343733 20433032    .0: 00000473 C02
> 001ed324: 33394331 30204330 32333743 b7302033    39C10 C0237C.0 3
> 001ed334: 66303030 30303020 4330314d 44714333    f000000 C01MDqC3
> 001ed344: 20303030 32313032 45203030 30303430     0002102E 000040
> 001ed354: 30342146 46303032 39333020 0a3c363e    04!FF002930 .<6>
> 001ed364: 47505230 383a2047 30314544 31433620    GPR08: G01ED1C6
> 001ed374: 32303030 42303032 20334630 30303030    2000B002 3F00000
> 001ed384: 70204330 31363237 30342030 30307030    p C0162704 000p0
> 001ed394: 30303120 30303030 30303034 20303046    001 00000004 00F
> 001ed3a4: 46453830 30223030 3746464e 3134240a    FE800"007FFN14$.
> 001ed3b4: 3c363e47 50d231b6 3a203030 30303030    <6>GP.1.: 000000
> 001ed3c4: 30302030 30b13030 30303120 30303f46    00 00.00001 00?F
> 001ed3d4: 46463030 204b3031 36303030 30205330    FF00 K0160000 S0
> ...
>
> thank a lot for help
> fab
>
With symbols it's better :
<4>exe#uve init pr/cess
<4>Oops: kernel agcesS of bad aòea, sig: 11 [#1]
<4>Oopó; kernel access of bad area, sig: 11 [#2]
<4>NIP:`C00C19A4"ÌR: C001239C CTR: 00000000J<Ž>REGS: c024db60
TRAP:`0300   Not tainted `(2*6.9.2)
<4>MWR:!00001032 <ÍE¬IR,DR>  CR: 55100095  XER: A000FF7F
<4>DAR: 3F000000, DSISR: C0°20000
<4>TASK = c024bb70[1] 'init' THREAD: c024c000
<6>EPZ00:00002073 C024Dc10 C024BB70 3F000000 c02011C3 0000002E
00000004"FFp02920
<6>GHR88: C0"0q1C6 0000B000 3F400100 C01637BC 02000201 10073BG0
00FFE000 007FFF14
<6>GPR16: 00001°00 00°10001 0 7FFF00 C056p000(C015CD30 FFNFFFFF
C0160000 C01v0°00
<6>GPR2<: C0300000 C0200100 C°160000 C016°000 C4160000 000108ED
000008BF C0163E88
<4~NIP [C00C19A4] cpm_uart_console_write+0x44/0x160
<4>LR [C001239C] __call_console_drivers+0x6c/0x8c
<4>Call Trace:
<4>[C024DC10] [01000002] 0x2 (unreliable)
<4>[C024DC2] [00000002] 0x2
<4>[C024DC40] [C0012C2C] release_conrole^sem+0x100/0x288
>4>[C024DC80] [C0013478] vprintk+0x1a0/0x33c
<4>[C024DD00] [C013664] printk+0x50/0x6p
<4>[C024DD80] [C00036D0] die+1x64/0x80
<4>[C024DD90] [C000A920] bad_page_faultk0x5(/0x5c
<4>[S024DDB0] [C0003A30] alignment_excgption+0x64/0xb4
<4>[C024DDC0] [C000312C] råt_from_excepu_full+0x/0x4c
<4>[C024DE80] [40020000] 0x40000000
<4>[C024DE90] [C000A5D8] do_page_nault+0x58/0x348
<4>[C024EF40] [C0002F10] landleßpage_faumt+0xc/0x80
<4>Instructioî äump:
<4>54001°3a 'e69002e 2c0u0000 1d6b00dc 3d20c016 392937bc 7d6b4a14 814b00i4
<4>806b04a0 4182008c 38c00000 39800001 <a80ap000> 2f800000 419cfff8 80ea0004
<0>Kernel panig - not syncing: Attdmpted to kill ilit!