Hello,
My company (Cybernetics) is using the FTDI USB to Serial converter in an embedded
application. I keep getting a kernel panic when I try to access the device. The panic
seems to happen when the driver receives serial data from the device while the driver
is
opened. I have attached debugging information below.
I have tried kernels 2.4.12 and 2.4.13-pre6; both get the same problem. I have not
tried
any older kernels.
Any help would be greatly appreciated.
Sincerely,
Anthony J. Battersby
Cybernetics
--------------------------------------------------------------------------------
/*
Program to reproduce the problem. Causes a kernel panic.
*/
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
int main(int argc, char *argv[])
{
int fd;
int ret;
unsigned char buf[1024];
fd = open("/dev/ttyUSB0", O_RDWR | O_NOCTTY | O_NDELAY);
if (fd == -1)
{
perror("open");
return -1;
}
ret = fcntl(fd, F_SETFL, 0);
if (ret == -1)
{
perror("fcntl");
return -1;
}
buf[0] = 0x1b;
buf[1] = 0x00;
ret = write(fd, buf, 2);
if (ret == -1)
{
perror("write");
return -1;
}
/* At this point, my device will respond to the "0x1b 0x00" command by */
/* sending a response such as "0x1b 0x00 0x00". If the sleep is omitted,*/
/* the termination of the program will cause the closing of /dev/ttyUSB0 */
/* and the kernel panic will not happen. */
sleep(1);
return 0;
}
--------------------------------------------------------------------------------
cat /proc/bus/usb/devices
T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2
B: Alloc=236/900 us (26%), #Int= 2, #Iso= 0
D: Ver= 1.00 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=0000 ProdID=0000 Rev= 0.00
S: Product=USB UHCI Root Hub
S: SerialNumber=ef80
C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=255ms
T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=1.5 MxCh= 0
D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=046d ProdID=c308 Rev=12.00
S: Manufacturer=Logitech
S: Product=Logitech USB Keyboard
C:* #Ifs= 2 Cfg#= 1 Atr=a0 MxPwr= 80mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=01 Driver=hid
E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl= 10ms
I: If#= 1 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=00 Prot=00 Driver=hid
E: Ad=82(I) Atr=03(Int.) MxPS= 8 Ivl= 32ms
T: Bus=01 Lev=01 Prnt=01 Port=01 Cnt=02 Dev#= 3 Spd=12 MxCh= 0
D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=0403 ProdID=6001 Rev= 2.00
S: Manufacturer=FTDI
S: Product=USB <-> Serial
S: SerialNumber=12345678
C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr= 90mA
I: If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=serial
E: Ad=81(I) Atr=02(Bulk) MxPS= 64 Ivl= 0ms
E: Ad=02(O) Atr=02(Bulk) MxPS= 64 Ivl= 0ms
--------------------------------------------------------------------------------
Output from ver_linux script (note: kernel and modules were compiled with gcc 2.91.66,
not
2.96)
Linux serpent 2.4.13-pre6 #1 Mon Oct 22 00:16:29 EST 2001 i686 unknown
Gnu C 2.96
Gnu make 3.79.1
binutils 2.10.91.0.2
util-linux 2.10s
mount 2.11b
modutils 2.4.2
e2fsprogs 1.19
Linux C Library 2.2.2
Dynamic linker (ldd) 2.2.2
Procps 2.0.7
Net-tools 1.57
Console-tools 0.3.3
Sh-utils 2.0
Modules Loaded nfs lockd sunrpc eepro100 ftdi_sio usbserial serial ide-cd cdrom
keybdev hid input usb-uhci usbcore
--------------------------------------------------------------------------------
ksymoops 2.4.0 on i686 2.4.13-pre6. Options used
-v /usr/src/linux/vmlinux (specified)
-k oops_ksyms (specified)
-l oops_modules (specified)
-o /lib/modules/2.4.13-pre6/ (default)
-m /boot/System.map-2.4.13-pre6 (default)
Warning (compare_maps): mismatch on symbol usb_devfs_handle , usbcore says c882dc34,
/lib/modules/2.4.13-pre6/kernel/drivers/usb/usbcore.o says c882d754. Ignoring
/lib/modules/2.4.13-pre6/kernel/drivers/usb/usbcore.o entry
invalid operand: 0000
CPU: 0
EIP: 0010:[<c011051d>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010282
eax: 00000018 ebx: c78f0820 ecx: 00000000 edx: 00000082
esi: c01d6000 edi: c01d6000 ebp: c01d7d64 esp: c01d7d1c
ds: 0018 es: 0018 ss: 0018
Process swapper (pid: 0, stackpage=c01d7000)
Stack: c01b0f16 c78f0820 c01d6000 c78f0858 c7843100 c88314f1 c747fe40 00000286
c78f0220 c7923400 c73bf7a1 00000000 c79471a0 c01d6000 00000286 00000000
c01d6000 c01d7da4 00000000 c886a665 c78f0820 c78f0800 00000001 c01d7def
Call Trace: [<c88314f1>] [<c886a665>] [<c88643bb>] [<c0155986>] [<c0156087>]
[<c01567cb>] [<c8830509>] [<c0168a41>] [<c883060c>] [<c8832336>] [<c01556ef>]
[<c0155788>] [<c886ab65>] [<c88328c0>] [<c88329c3>] [<c0110001>] [<c0107d7d>]
[<c0107ee7>] [<c01051a0>] [<c01051a0>] [<c0109d58>] [<c01051a0>] [<c01051a0>]
[<c01051c3>] [<c0105224>] [<c0105000>] [<c0105027>]
Code: 0f 0b 8d 65 bc 5b 5e 5f 89 ec 5d c3 8d 76 00 55 89 e5 83 ec
>>EIP; c011051d <schedule+3bd/3cc> <=====
Trace; c88314f1 <[usb-uhci]uhci_submit_urb+21d/34c>
Trace; c886a665 <[ftdi_sio]ftdi_sio_write+145/364>
Trace; c88643bb <[usbserial]serial_write+97/b4>
Trace; c0155986 <tty_default_put_char+1e/24>
Trace; c0156087 <echo_char+3f/5c>
Trace; c01567cb <n_tty_receive_buf+377/d8c>
Trace; c8830509 <[usb-uhci]uhci_submit_bulk_urb+455/464>
Trace; c0168a41 <ide_set_handler+55/60>
Trace; c883060c <[usb-uhci]uhci_clean_transfer+94/1d0>
Trace; c8832336 <[usb-uhci]process_transfer+2f2/304>
Trace; c01556ef <flush_to_ldisc+db/e4>
Trace; c0155788 <tty_flip_buffer_push+14/58>
Trace; c886ab65 <[ftdi_sio]ftdi_sio_read_bulk_callback+22d/2a8>
Trace; c88328c0 <[usb-uhci]process_urb+1d4/210>
Trace; c88329c3 <[usb-uhci]uhci_interrupt+c7/12c>
Trace; c0110001 <reschedule_idle+29/9c>
Trace; c0107d7d <handle_IRQ_event+31/5c>
Trace; c0107ee7 <do_IRQ+6b/a8>
Trace; c01051a0 <default_idle+0/28>
Trace; c01051a0 <default_idle+0/28>
Trace; c0109d58 <call_do_IRQ+5/d>
Trace; c01051a0 <default_idle+0/28>
Trace; c01051a0 <default_idle+0/28>
Trace; c01051c3 <default_idle+23/28>
Trace; c0105224 <cpu_idle+3c/50>
Trace; c0105000 <_stext+0/0>
Trace; c0105027 <rest_init+27/28>
Code; c011051d <schedule+3bd/3cc>
00000000 <_EIP>:
Code; c011051d <schedule+3bd/3cc> <=====
0: 0f 0b ud2a <=====
Code; c011051f <schedule+3bf/3cc>
2: 8d 65 bc lea 0xffffffbc(%ebp),%esp
Code; c0110522 <schedule+3c2/3cc>
5: 5b pop %ebx
Code; c0110523 <schedule+3c3/3cc>
6: 5e pop %esi
Code; c0110524 <schedule+3c4/3cc>
7: 5f pop %edi
Code; c0110525 <schedule+3c5/3cc>
8: 89 ec mov %ebp,%esp
Code; c0110527 <schedule+3c7/3cc>
a: 5d pop %ebp
Code; c0110528 <schedule+3c8/3cc>
b: c3 ret
Code; c0110529 <schedule+3c9/3cc>
c: 8d 76 00 lea 0x0(%esi),%esi
Code; c011052c <__wake_up+0/90>
f: 55 push %ebp
Code; c011052d <__wake_up+1/90>
10: 89 e5 mov %esp,%ebp
Code; c011052f <__wake_up+3/90>
12: 83 ec 00 sub $0x0,%esp
<0>Kernel panic: Aiee, killing interrupt handler!
1 warning issued. Results may not be reliable.
--------------------------------------------------------------------------------
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