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    SubjectRe: [Alsa-devel] Slab corruptions & Re: 2.6.17-rc1: Oops in sound applications
    At Tue, 4 Apr 2006 21:06:31 +0200,
    Jan Niehusmann wrote:
    >
    > On Tue, Apr 04, 2006 at 05:56:36PM +0200, Takashi Iwai wrote:
    > > Could you try the patch below by OGAWA Hirofumi
    > > <hirofumi@mail.parknet.co.jp>?
    >
    > Sorry, no success with that patch applied:
    >
    > Apr 4 20:18:00 knautsch kernel: [17179569.184000] Linux version 2.6.17-rc1-g231a1569-dirty (root@knautsch) (gcc version 4.0.3 (Debian 4.0.3-1)) #1 Tue Apr 4 19:37:29 CEST 2006
    >
    > (This is 2.6.17-rc1 with the patch you sent applied)
    >
    > Apr 4 20:25:51 knautsch kernel: [17180076.984000] BUG: unable to handle kernel paging request at virtual address 6b6b6b6b
    > Apr 4 20:25:51 knautsch kernel: [17180076.984000] printing eip:
    > Apr 4 20:25:51 knautsch kernel: [17180076.984000] e04a2eb6
    > Apr 4 20:25:51 knautsch kernel: [17180076.984000] *pde = 00000000
    > Apr 4 20:25:51 knautsch kernel: [17180076.984000] Oops: 0000 [#1]
    > Apr 4 20:25:51 knautsch kernel: [17180076.984000] Modules linked in: tun ipv6 lp i915 drm rfcomm l2cap bluetooth thermal processor fan button battery asus_acpi ac usb_storage usbmouse sbp2 usbkbd autofs4 af_packet nls_iso8859_1 nls_cp437 usbhid cm4000_cs 8250_pci 8250 serial_core eth1394 pcmcia snd_intel8x0 snd_pcm_oss snd_mixer_oss snd_intel8x0m snd_ac97_codec snd_ac97_bus ipw2200 ieee80211 ieee80211_crypt 8139too mii nsc_ircc irda snd_pcm snd_timer ohci1394 ieee1394 evdev joydev crc_ccitt parport_pc parport pcspkr firmware_class yenta_socket rsrc_nonstatic pcmcia_core rtc snd soundcore snd_page_alloc ehci_hcd uhci_hcd usbcore intel_agp agpgart
    > Apr 4 20:25:51 knautsch kernel: [17180076.984000] CPU: 0
    > Apr 4 20:25:51 knautsch kernel: [17180076.984000] EIP: 0060:[pg0+537210550/1069212672] Not tainted VLI
    > Apr 4 20:25:51 knautsch kernel: [17180076.984000] EFLAGS: 00210002 (2.6.17-rc1-g231a1569-dirty #1)
    > Apr 4 20:25:51 knautsch kernel: [17180076.984000] EIP is at snd_pcm_lib_write1+0x196/0x4a0 [snd_pcm]
    > Apr 4 20:25:51 knautsch kernel: [17180076.984000] eax: 000009c4 ebx: cc785a84 ecx: de505e54 edx: 6b6b6b6b
    > Apr 4 20:25:51 knautsch kernel: [17180076.984000] esi: 0000062c edi: 00000000 ebp: dede51a4 esp: de505e78
    > Apr 4 20:25:51 knautsch kernel: [17180076.984000] ds: 007b es: 007b ss: 0068
    > Apr 4 20:25:51 knautsch kernel: [17180076.984000] Process twinkle (pid: 4936, threadinfo=de505000 task=cae0f550)
    > Apr 4 20:25:51 knautsch kernel: [17180076.984000] Stack: <0>dede51a4 000015cd e07a5000 00000b42 0000003c 00000001 cc785b28 c84ef000
    > Apr 4 20:25:51 knautsch kernel: [17180076.984000] e07a5000 00000b7e 00000b7e 00000000 00000000 0001c639 00000000 cae0f550
    > Apr 4 20:25:51 knautsch kernel: [17180076.984000] c0114d60 cc785b28 cc785b28 c0000000 de505000 dede51a4 cc785a84 e0547727
    > Apr 4 20:25:51 knautsch kernel: [17180076.984000] Call Trace:
    > Apr 4 20:25:51 knautsch kernel: [17180076.984000] <c0114d60> default_wake_function+0x0/0x20 <e0547727> snd_pcm_oss_write3+0x67/0xe0 [snd_pcm_oss]
    > Apr 4 20:25:51 knautsch kernel: [17180076.984000] <e04a0250> snd_pcm_lib_write_transfer+0x0/0xc0 [snd_pcm] <e054949f> snd_pcm_plug_write_transfer+0x8f/0xe0 [snd_pcm_oss]
    > Apr 4 20:25:51 knautsch kernel: [17180076.984000] <e054781a> snd_pcm_oss_write2+0x7a/0x110 [snd_pcm_oss] <e054892e> snd_pcm_oss_write+0x10e/0x1f0 [snd_pcm_oss]
    > Apr 4 20:25:51 knautsch kernel: [17180076.984000] <c0158f85> vfs_write+0xb5/0x190 <c0159a1b> sys_write+0x4b/0x80
    > Apr 4 20:25:51 knautsch kernel: [17180076.984000] <c0102e97> syscall_call+0x7/0xb
    > Apr 4 20:25:51 knautsch kernel: [17180076.984000] Code: b8 c4 09 00 00 e8 db fb e5 df fa 85 c0 0f 85 05 02 00 00 8b 93 98 00 00 00 8b 02 83 f8 02 74 0b 8b 02 83 f8 06 0f 85 da 02 00 00 <8b> 02 83 f8 05 0f 8f ed 01 00 00 83 f8 04 0f 8d 1e 02 00 00 48
    >
    > This oops is different from the others in that it contains the 6b6b6b6b
    > magic from slab poisoning. But, again, this is clearly sound related:
    > EIP points to snd_pcm_lib_write, and the trigger procedure was the
    > following:
    >
    > 1) Use twinke to make a VoIP-Call. Sound was a little bit choppy, so
    > there is already something wrong here. No oops or other error message
    > yet, though.
    >
    > 2) From a second xterm, call "yes >/dev/dsp"
    >
    > This lead to a beeping sound (as expected), so opening the device and
    > sending sound was successful - and to the oops quoted above.

    What happens if you copy the whole subtree linux/sound and
    linux/include/sound from 2.6.16?

    I don't figure out yet what could break except for that typo.


    Takashi
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