Jiri Slaby <[EMAIL PROTECTED]> writes:
> [EMAIL PROTECTED] wrote:
>> Hi Jiri,
>>
>> I've figured out that both old and new mxser drivers have two similar
>> problems:
>>
>> 1. When there are data coming to a port, sometimes opening of the port
>> entirely locks the box. This is quite reproducible. Any idea what's
>> wrong and how can I help to debug it?
>
> Could you test the patch below, if something changes?
Just tested with low_latency commented out. Still oopses:
BUG: unable to handle kernel NULL pointer dereference at virtual address
00000008
printing eip:
f8f1730f
*pde = 00000000
Oops: 0000 [#1]
SMP
Modules linked in: nvidia agpgart ipv6 nfs lockd nfs_acl sunrpc dm_mod sr_mod
sbp2 ieee1394 ide_generic ide_disk e1000 snd_hda_intel snd_hda_codec
snd_pcm_oss snd_mixer_oss snd_pcm snd_timer i2c_i801 tsdev psmouse snd
soundcore snd_page_alloc i2c_core serio_raw parport_pc parport mxser_new evdev
floppy pcspkr rtc ext3 jbd mbcache usb_storage usbhid ide_cd cdrom sd_mod
uhci_hcd piix usbcore skge ata_piix libata scsi_mod generic ide_core thermal
processor fan
CPU: 0
EIP: 0060:[<f8f1730f>] Tainted: P VLI
EFLAGS: 00010046 (2.6.18-3-686 #1)
EIP is at mxser_receive_chars+0x21b/0x249 [mxser_new]
eax: 00000000 ebx: 00000000 ecx: 00000000 edx: 00000286
esi: f8f1c79c edi: 00000001 ebp: c1be6000 esp: c0313efc
ds: 007b es: 007b ss: 0068
Process swapper (pid: 0, ti=c0312000 task=c02c76a0 task.ti=c0312000)
Stack: c0313f48 f8f1c8a8 0000903d 00000000 00000fff 000000ff 00000286 0000007b
f8f1c79c 00000006 0000007f 000000c6 f8f17d7a 00000007 00000008 00000080
00000000 00000000 f8f1bdc0 00000060 df985500 00000000 00000000 0000003a
Call Trace:
[<f8f17d7a>] mxser_interrupt+0x15f/0x1e6 [mxser_new]
[<c013fb83>] handle_IRQ_event+0x23/0x49
[<c013fc3c>] __do_IRQ+0x93/0xe8
[<c01050e5>] do_IRQ+0x43/0x52
[<c01036b6>] common_interrupt+0x1a/0x20
[<c0101b91>] mwait_idle+0x25/0x38
[<c0101b52>] cpu_idle+0x9f/0xb9
[<c03186fd>] start_kernel+0x379/0x380
Code: ed ff ff eb 1f 8b 06 83 78 18 00 75 17 8b 56 08 83 c2 05 ec 8b 14 24 0f
b6 c0 a8 01 89 02 0f 85 d4 fe ff ff 8b 46 04 8b 54 24 18 <8b> 40 08 01 3c 85 c4
ec f1 f8 8b 44 24 04 01 be f4 00 00 00 01
EIP: [<f8f1730f>] mxser_receive_chars+0x21b/0x249 [mxser_new] SS:ESP
0068:c0313efc
<0>Kernel panic - not syncing: Fatal exception in interrupt
BUG: warning at arch/i386/kernel/smp.c:547/smp_call_function()
[<c010f5a3>] smp_call_function+0x53/0xfe
[<c011d97e>] printk+0x14/0x18
[<c010f661>] smp_send_stop+0x13/0x1c
[<c011cfc6>] panic+0x4c/0xe2
[<c0104013>] die+0x256/0x28a
[<c01156e0>] do_page_fault+0x3b4/0x481
[<c01f9f8d>] tty_buffer_request_room+0x107/0x112
[<c011532c>] do_page_fault+0x0/0x481
[<c01037f9>] error_code+0x39/0x40
[<f8f1730f>] mxser_receive_chars+0x21b/0x249 [mxser_new]
[<f8f17d7a>] mxser_interrupt+0x15f/0x1e6 [mxser_new]
[<c013fb83>] handle_IRQ_event+0x23/0x49
[<c013fc3c>] __do_IRQ+0x93/0xe8
[<c01050e5>] do_IRQ+0x43/0x52
[<c01036b6>] common_interrupt+0x1a/0x20
[<c0101b91>] mwait_idle+0x25/0x38
[<c0101b52>] cpu_idle+0x9f/0xb9
[<c03186fd>] start_kernel+0x379/0x380
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