Re: Page faults on wheezy + pogoplug

davygravy — Tue, 15 May 2012 22:12:00 -0500

Great!

Re: Page faults on wheezy + pogoplug

shockingpink — Tue, 15 May 2012 22:00:55 -0500

Falling back to the 3.1 kernel from http://snapshot.debian.org/archive/debian/20120114T153156Z/pool/main/l/linux-2.6/linux-image-3.1.0-1-kirkwood_3.1.6-1_armel.deb

worked! compiling works without page faults!

I'll go try the 3.3 kernel, but at least I know that it's a kernel problem. Hopefully this saves other people some time.

Re: Page faults on wheezy + pogoplug

davygravy — Tue, 15 May 2012 21:35:49 -0500

http://forum.doozan.com/read.php?2,7676

good luck, hope you get it working... if you don't you can always try Ubuntu + CodeSourcery toolchain... very, very fast...

Re: Page faults on wheezy + pogoplug

shockingpink — Tue, 15 May 2012 21:29:19 -0500

"The kernel in this section"
Say more about this section....

Re: Page faults on wheezy + pogoplug

davygravy — Tue, 15 May 2012 21:26:03 -0500

for grins and giggles you can try the kernel in this section : It is a 3.3.2 Debian profile kernel that supports a few other machines... it could be a holdover problem on 3.2...

Page faults on wheezy + pogoplug

shockingpink — Tue, 15 May 2012 21:10:14 -0500

I've got a really irritating problem and am not shure where to look. I get a kernel page fault every time I try to compile something. Has anyone else seen this?

My next step is probably to try a custom kernel or an old one. Recommendations?

Background:

Pogoplug E02, fresh install of uboot & Wheezy. The disk is a western digital USB drive adapter with a SATA SSD.
Linux hostname 3.2.0-2-kirkwood #1 Mon Apr 30 23:13:18 UTC 2012 armv5tel GNU/Linux
All software runs fine, modules load, play sound. It all looks good. ... until I try to compile something.
I've tried removing the soundcard, no difference there.

# starting with netcat, just more complicated than hello world.
cc -s -o nc netcat.c
cc: internal compiler error: Segmentation fault (program as)
Please submit a full bug report,

# where did it die?
strace -f gcc netcat.c
[snip]
[pid 1357] mmap2(NULL, 266240, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb6918000
[pid 1357] munmap(0xb6918000, 266240) = 0
[pid 1357] brk(0x6b0000) = 0x6b0000
[pid 1357] fstat64(3, {st_mode=S_IFREG|0600, st_size=0, ...}) = 0
[pid 1357] mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb6958000
[pid 1357] _llseek(3, 16384, [16384], SEEK_SET) = 0
[pid 1357] read(3, "", 2204) = 0
[pid 1357] _llseek(3, 2204, [18588], SEEK_CUR) = 0
[pid 1357] write(3, "\0netcat.c\0$d\0unknown\0p_tcp\0p_udp"..., 919) = 919
[pid 1357] _llseek(3, 0, [0], SEEK_SET) = 0
[pid 1357] read(3,
[pid 1357] +++ killed by SIGSEGV +++
Process 1355 resumed
<... wait4 resumed> [{WIFSIGNALED(s) && WTERMSIG(s) == SIGSEGV}], 0, NULL) = 1357

# looks reasonable from the compiler, what about kernel?

dmesg
[ 1916.090458] note: as[1337] exited with preempt_count 1
[ 1916.095623] BUG: scheduling while atomic: as/1337/0x40000001
[ 1916.101313] Modules linked in: ipv6 snd_usb_audio snd_usbmidi_lib snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm snd_page_alloc snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device hmac snd_timer snd soundcore sha1_generic mv_cesa aes_generic ext2 mbcache sd_mod crc_t10dif usb_storage uas scsi_mod ehci_hcd usbcore mvsdio mmc_core usb_common mv643xx_eth inet_lro libphy
[ 1916.135355] [] (unwind_backtrace+0x0/0xe0) from [] (__schedule+0x4c/0x488)
[ 1916.144034] [] (__schedule+0x4c/0x488) from [] (__cond_resched+0x24/0x34)
[ 1916.152625] [] (__cond_resched+0x24/0x34) from [] (_cond_resched+0x38/0x44)
[ 1916.161381] [] (_cond_resched+0x38/0x44) from [] (down_read+0xc/0x18)
[ 1916.169611] [] (down_read+0xc/0x18) from [] (acct_collect+0x40/0x198)
[ 1916.177831] [] (acct_collect+0x40/0x198) from [] (do_exit+0x1e8/0x6dc)
[ 1916.186231] [] (do_exit+0x1e8/0x6dc) from [] (die+0x2fc/0x33c)
[ 1916.193856] [] (die+0x2fc/0x33c) from [] (__do_kernel_fault.part.4+0x54/0x74)
[ 1916.202792] [] (__do_kernel_fault.part.4+0x54/0x74) from [] (do_page_fault+0x280/0x29c)
[ 1916.212599] [] (do_page_fault+0x280/0x29c) from [] (do_DataAbort+0x34/0x98)
[ 1916.221353] [] (do_DataAbort+0x34/0x98) from [] (__dabt_svc+0x38/0x60)
[ 1916.229664] Exception stack(0xcfbc7da8 to 0xcfbc7df0)
[ 1916.234743] 7da0: 400f4000 10ffd000 00000f80 00000020 00001000 400f4000
[ 1916.242967] 7dc0: cfbc6000 00000001 10ffd000 cfbc7f00 00001000 c0eb8fa0 00000000 cfbc7df4
[ 1916.251195] 7de0: c019c874 c0192984 20000013 ffffffff
[ 1916.256278] [] (__dabt_svc+0x38/0x60) from [] (memcpy+0x64/0x3a4)
[ 1932.874164] Unable to handle kernel paging request at virtual address 10ffd000
[ 1932.881462] pgd = cfbbc000
[ 1932.884182] [10ffd000] *pgd=00000000
[ 1932.887777] Internal error: Oops: 5 [#2]
[ 1932.891715] Modules linked in: ipv6 snd_usb_audio snd_usbmidi_lib snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm snd_page_alloc snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device hmac snd_timer snd soundcore sha1_generic mv_cesa aes_generic ext2 mbcache sd_mod crc_t10dif usb_storage uas scsi_mod ehci_hcd usbcore mvsdio mmc_core usb_common mv643xx_eth inet_lro libphy
[ 1932.925700] CPU: 0 Tainted: G D (3.2.0-2-kirkwood #1)
[ 1932.932002] PC is at memcpy+0x64/0x3a4
[ 1932.935766] LR is at __copy_to_user_memcpy+0xdc/0x12c
[ 1932.940839] pc : [] lr : [] psr: 20000013
[ 1932.940844] sp : ce7cbdf4 ip : 00000000 fp : c0eb8fa0
[ 1932.952381] r10: 00001000 r9 : ce7cbf00 r8 : 10ffd000
[ 1932.957631] r7 : 00000001 r6 : ce7ca000 r5 : 400d5000 r4 : 00001000
[ 1932.964190] r3 : 00000020 r2 : 00000f80 r1 : 10ffd000 r0 : 400d5000
[ 1932.970747] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
[ 1932.977915] Control: 0005397f Table: 0fbbc000 DAC: 00000015
[ 1932.983687] Process as (pid: 1342, stack limit = 0xce7ca270)
[ 1932.989372] Stack: (0xce7cbdf4 to 0xce7cc000)
[ 1932.993752] bde0: 400d5000 ce7ca000 00000001
[ 1933.001970] be00: 10ffd000 400d5000 00001000 c019c874 cfbd3354 ce7e30b4 00001000 ce7cbe80
[ 1933.010192] be20: 00001000 00000000 c0eb8fa0 00001000 ce7ca000 c0085518 00001000 00000000
[ 1933.018415] be40: cf946e38 00000000 00000000 c11d0d40 ce7cbf48 c009a07c 000200da 00000000
[ 1933.026629] be60: 00000000 c11d0d40 00000000 ce7ca000 00001000 cf946ef8 00000000 00000001
[ 1933.034844] be80: 00000000 00001000 400d5000 00000000 00001000 c0eb8fa0 ce7cbe94 c11d0d40
[ 1933.043067] bea0: ce7cbf80 fffffdee ce7cbf80 00001000 ce7ca000 00000000 00000000 c00bd914
[ 1933.051289] bec0: 00000000 00000000 400d6000 400d5000 00000000 00000001 ffffffff c11d0d40
[ 1933.059503] bee0: 00000000 00000000 00000000 00000000 c100b400 00020000 00000000 00000000
[ 1933.067717] bf00: 00000000 00000000 00000000 00000000 00001000 c0157e88 00001000 00000000
[ 1933.075932] bf20: c11d0d40 00001000 00000000 c00bdc80 000007ff 00000000 0000008c c00bd694
[ 1933.084155] bf40: 00000000 c11d0d40 400d5000 00001000 00001000 c11d0d40 400d5000 c00be0f4
[ 1933.092378] bf60: c11d0d40 400d5000 c11d0d40 400d5000 00000000 00000000 00001000 c00be1f8
[ 1933.100600] bf80: 00000000 00000000 00001000 00000000 01f1c2e0 00000034 00000000 00000003
[ 1933.108816] bfa0: c000e028 c000de80 01f1c2e0 00000034 00000003 400d5000 00001000 00000000
[ 1933.117038] bfc0: 01f1c2e0 00000034 00000000 00000003 00000000 400d5000 00000034 00000000
[ 1933.125252] bfe0: 00000000 bee2a1f0 4023f100 4029295c 60000010 00000003 00000000 00000000
[ 1933.133468] Code: ba000002 f5d1f03c f5d1f05c f5d1f07c (e8b151f8)
[ 1933.139816] ---[ end trace 673610ac15753c03 ]---