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    SubjectRe: bttv bug
    Can you reproduce it without the nvidia module and produce a call
    trace that doesn't include nvidia symbols?

    On Tue, Sep 09, 2003 at 11:41:58PM -0700, Misha Nasledov wrote:
    > Hi,
    >
    > After upgrading to -test5, my bt878 card ceased to function properly. My
    > kernel is tainted with the nvidia kernel module but I know for a fact that
    > bttv worked just fine not too long ago and I have not upgraded my nvidia
    > drivers since.
    >
    > I have the following message in my dmesg:
    >
    > kernel BUG at drivers/media/video/btcx-risc.c:66!
    > invalid operand: 0000 [#1]
    > CPU: 0
    > EIP: 0060:[<e096b0a1>] Tainted: P
    > EFLAGS: 00010286
    > EIP is at btcx_riscmem_alloc+0xa1/0xb0 [btcx_risc]
    > eax: 00000000 ebx: 000008b8 ecx: cdaed000 edx: ce59a000
    > esi: db5607dc edi: ce59a8b8 ebp: 00000280 esp: dbb95b54
    > ds: 007b es: 007b ss: 0068
    > Process motv (pid: 757, threadinfo=dbb94000 task=dc7c0140)
    > Stack: dfe8f054 000008b8 dbb95b64 00000020 0e59a000 00000280 00000000 db560740
    > e09b2a3e dfe8f000 db5607dc 000008b8 00000280 00012c00 db560740 00000001
    > e09b40f4 e09c1d00 db5607dc dd8cb400 00000000 00000280 00000000 000000f0
    > Call Trace:
    > [<e09b2a3e>] bttv_risc_packed+0x3e/0x150 [bttv]
    > [<e09b40f4>] bttv_buffer_risc+0x514/0x630 [bttv]
    > [<e0986846>] videobuf_waiton+0xb6/0xf0 [video_buf]
    > [<e09ab194>] bttv_prepare_buffer+0x104/0x1a0 [bttv]
    > [<e09ab2f2>] buffer_prepare+0x42/0x50 [bttv]
    > [<e0986dc2>] videobuf_qbuf+0xa2/0x110 [video_buf]
    > [<c044560f>] wait_hpet_tick+0xf/0x30
    > [<e09ad769>] bttv_do_ioctl+0x1109/0x1410 [bttv]
    > [<c013bb50>] __alloc_pages+0x90/0x300
    > [<c0262bbd>] do_rw_taskfile+0x1bd/0x2b0
    > [<c01456b2>] do_anonymous_page+0x122/0x230
    > [<c0145df9>] handle_mm_fault+0xf9/0x190
    > [<c011ab77>] try_to_wake_up+0xa7/0x150
    > [<e0a530fa>] __nvsym01580+0x3a/0x70 [nvidia]
    > [<e0a530fa>] __nvsym01580+0x3a/0x70 [nvidia]
    > [<e0a71ee4>] __nvsym01575+0x28/0x34 [nvidia]
    > [<e0a53179>] __nvsym01540+0x49/0x90 [nvidia]
    > [<c011ab77>] try_to_wake_up+0xa7/0x150
    > [<c011b66a>] default_wake_function+0x2a/0x30
    > [<c011b3d0>] schedule+0x1c0/0x3e0
    > [<c02c01f4>] kfree_skbmem+0x24/0x30
    > [<c02c0282>] __kfree_skb+0x82/0x100
    > [<c031b57d>] unix_stream_recvmsg+0x28d/0x580
    > [<c011b61a>] preempt_schedule+0x2a/0x50
    > [<c02bc798>] sock_aio_read+0xb8/0xd0
    > [<c01520bb>] do_sync_read+0x8b/0xc0
    > [<c044560f>] wait_hpet_tick+0xf/0x30
    > [<c0258588>] video_usercopy+0xc8/0x1c0
    > [<c044560f>] wait_hpet_tick+0xf/0x30
    > [<c01649b0>] __pollwait+0x0/0xd0
    > [<c0165094>] sys_select+0x234/0x4c0
    > [<e09adaae>] bttv_ioctl+0x3e/0x70 [bttv]
    > [<c044560f>] wait_hpet_tick+0xf/0x30
    > [<e09ac660>] bttv_do_ioctl+0x0/0x1410 [bttv]
    > [<c044560f>] wait_hpet_tick+0xf/0x30
    > [<c01641e3>] sys_ioctl+0xf3/0x290
    > [<c044560f>] wait_hpet_tick+0xf/0x30
    > [<c010915b>] syscall_call+0x7/0xb
    > [<c044560f>] wait_hpet_tick+0xf/0x30
    >
    > Code: 0f 0b 42 00 e0 b5 96 e0 eb b7 90 8d 74 26 00 83 ec 18 89 7c
    > bttv0: skipped frame. no signal? high irq latency?
    >
    > --
    > Misha Nasledov
    > misha@nasledov.com
    > http://nasledov.com/misha/
    > -
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