kernel load issues (insmod segfault)

From: Toralf Lund
Date: Fri Apr 01 2005 - 08:07:05 EST

Hi.

I thought I might try this one again (with updated code and more compete info):

I have a special hardware driver module that leads to unexpected trouble at load-time; insmod simply segfaults. That's unexpected not because I can guarantee that the module is good, but because the problem still occurs if I reduce the code to the point were virtually all the actual driver code is gone. The below commands & output should fully illustrate the problem (/var/log/debug is set up via /etc/syslog.conf to receive KERN_DEBUG.)

Any help would be appreciated.


# make itifg8tst.o
gcc -pipe -Wall -O2 -DLinux -mcpu=i686 -I../../include -fno-common -fno-strict-aliasing -fomit-frame-pointer -nostdinc -I. -I/lib/modules/2.6.11.4-0.EL.toralf/build/include -I/usr/lib/gcc/i386-redhat-linux/3.4.3/include -D__KERNEL__ -DMODULE -I/lib/modules/2.6.11.4-0.EL.toralf/build/include/asm-i386/mach-default -o itifg8tst.o -c itifg8tst.c

# /lib/modules/2.6.11.4-0.EL.toralf/build/scripts/mod/modpost -i /lib/modules/2.6.11.4-0.EL.toralf/build/Module.symvers -m itifg8tst.o

# sed -e /KBUILD_MODNAME/s//itifg8tst/ itifg8tst.mod.c > sabel

# mv sabel itifg8tst.mod.c

# make itifg8tst.mod.o
gcc -pipe -Wall -O2 -DLinux -mcpu=i686 -I../../include -fno-common -fno-strict-aliasing -fomit-frame-pointer -nostdinc -I. -I/lib/modules/2.6.11.4-0.EL.toralf/build/include -I/usr/lib/gcc/i386-redhat-linux/3.4.3/include -D__KERNEL__ -DMODULE -I/lib/modules/2.6.11.4-0.EL.toralf/build/include/asm-i386/mach-default -o itifg8tst.mod.o -c itifg8tst.mod.c

# ld -r -o itifg8tst.ko itifg8tst.o itifg8tst.mod.o

# insmod itifg8tst.ko
Segmentation fault

# tail -25 /var/log/messages
Apr 1 14:27:18 hai ntpd[2668]: kernel time sync disabled 0041
Apr 1 14:31:30 hai ntpd[2668]: kernel time sync enabled 0001
Apr 1 14:39:56 hai kernel: Unable to handle kernel paging request at virtual address 533e3762
Apr 1 14:39:56 hai kernel: printing eip:
Apr 1 14:39:56 hai kernel: c01d9302
Apr 1 14:39:56 hai kernel: *pde = 00000000
Apr 1 14:39:56 hai kernel: Oops: 0000 [#1]
Apr 1 14:39:56 hai kernel: Modules linked in: itifg8tst nfsd exportfs lp nfs lockd sunrpc video button battery ac md5 ipv6 uhci_hcd parport_pc parport via686a
i2c_sensor i2c_core 3c59x mii floppy dm_snapshot dm_zero dm_mirror ext3 jbd dm_mod aic7xxx sd_mod scsi_mod
Apr 1 14:39:56 hai kernel: CPU: 0
Apr 1 14:39:56 hai kernel: EIP: 0060:[<c01d9302>] Not tainted VLI
Apr 1 14:39:56 hai kernel: EFLAGS: 00010293 (2.6.11.4-0.EL.toralf)
Apr 1 14:39:56 hai kernel: EIP is at pci_get_subsys+0x100/0x1b7
Apr 1 14:39:56 hai kernel: eax: 00000000 ebx: 533e373c ecx: ffffffff edx: 533e373c
Apr 1 14:39:56 hai kernel: esi: e0912001 edi: ffffffff ebp: d21ddf9c esp: d21ddf74
Apr 1 14:39:56 hai kernel: ds: 007b es: 007b ss: 0068
Apr 1 14:39:56 hai kernel: Process insmod (pid: 4835, threadinfo=d21dc000 task=df74adf0)
Apr 1 14:39:56 hai kernel: Stack: ffffffff 00000000 00000000 0045f378 d21dc000
c01d93c4 ffffffff e0912001
Apr 1 14:39:56 hai kernel: e095c049 ffffffff ffffffff 00000000 00000000
e0912400 00000000 e0912400
Apr 1 14:39:56 hai kernel: c013687d 0804a018 00000000 c0103281 0804a018
00000ae7 0804a008 00000000
Apr 1 14:39:57 hai kernel: Call Trace:
Apr 1 14:39:57 hai kernel: [<c01d93c4>] pci_get_device+0xb/0xe
Apr 1 14:39:57 hai kernel: [<e095c049>] mod_init+0x49/0x56 [itifg8tst]
Apr 1 14:39:57 hai kernel: [<c013687d>] sys_init_module+0x1dd/0x2b6
Apr 1 14:39:57 hai kernel: [<c0103281>] sysenter_past_esp+0x52/0x75
Apr 1 14:39:57 hai kernel: Code: 04 8b 16 eb 4e 8b 15 e8 f2 35 c0 eb 46 81 fa e8 f2 35 c0 74 42 83 3c 24 ff 89 d3 74 09 0f b7 42 24 3b 04 24 75 2b 83 fd ff 74
08 <0f> b7 43 26 39 e8 75 1e 83 ff ff 74 08 0f b7 43 28 39 f8 75 11

# tail /var/log/debug
Apr 1 14:22:59 hai xinetd[2652]: removing telnet
Apr 1 14:22:59 hai xinetd[2652]: removing kshell
Apr 1 14:22:59 hai xinetd[2652]: removing rsync
Apr 1 14:22:59 hai xinetd[2652]: removing time
Apr 1 14:22:59 hai xinetd[2652]: removing time
Apr 1 14:23:00 hai kernel: parport_pc: VIA 686A/8231 detected
Apr 1 14:23:00 hai kernel: parport_pc: probing current configuration
Apr 1 14:23:00 hai kernel: parport_pc: Current parallel port base: 0x378
Apr 1 14:23:09 hai kernel: eth0: no IPv6 routers present
Apr 1 14:39:56 hai kernel: Scanning all devices...

# cat itifg8tst.c
#include <linux/pci.h>
#include <linux/module.h>

MODULE_LICENSE("GPL");


static void __exit mod_exit(void)
{
}

static __init int mod_init(void)
{
struct pci_dev *dev;

printk(KERN_DEBUG "Scanning all devices...\n");

dev = NULL;
while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev))) {
printk(KERN_DEBUG "Device %04hx:%04hx\n",
dev->vendor, dev->device);
}
return 0;
}

module_init(mod_init);
module_exit(mod_exit);

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