Hi
One last important detail. The module works creating the mmap driver
operation. The driver uses vm_insert_page and getting the pages with
__get_free_pages. Would that be the problem???
thanks
David
On Fri, Jul 11, 2008 at 3:04 PM, David Francisco Rodriguez Perez <
[EMAIL PROTECTED]> wrote:
> Hi All
>
> I am having problems with LKM compiled for UML. I am porting some drivers
> from our box to our simulation based on UML. But I am having segmentation
> faults or memory corruptions which by gdb always looks at the same place.
> So I wanted to know if my problem is because the modules have been compiled
> incorrectly or it is something in my module itself or my kernel is missing
> something at the config. My guest kernel is 2.6.24.3 and the host, I am
> trying are 2.6.9-34.ELsmp and the other host is 2.6.24-19-generic. I am
> working with SKAS0 as for now so I do not have patch neither the guest,
> neither the host. The other thing is that the linux has been compiled with
> the initramfs embeded on the image. Anexing boot up and then the problem.
>
> Thanks
>
> David Rodriguez
>
> PS. loadmodule is an script that is doing
> /sbin/insmod /lib/modules/module <args> || exit 1
>
> $ gdb ./linux
> GNU gdb Red Hat Linux (6.3.0.0-1.96rh)
> Copyright 2004 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you
> are
> welcome to change it and/or distribute copies of it under certain
> conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB. Type "show warranty" for details.
> This GDB was configured as "i386-redhat-linux-gnu"...Using host
> libthread_db library "/lib/tls/libthread_db.so.1".
>
> (gdb) set args mem=128M eth0=mcast NI=5
> (gdb) r
> Starting program: /home/darodrig/sim_ni/linux mem=128M eth0=mcast NI=5
> ENTERING NOT INTERACTIVE SHELL
> Core dump limits :
> soft - 0
> hard - NONE
> Checking that ptrace can change system call numbers...Detaching after fork
> from child process 30262.
> OK
> Checking syscall emulation patch for ptrace...Detaching after fork from
> child process 30263.
> missing
> Checking for tmpfs mount on /dev/shm...OK
> Checking PROT_EXEC mmap in /dev/shm/...OK
> Checking for the skas3 patch in the host:
> - /proc/mm...not found: No such file or directory
> - PTRACE_FAULTINFO...Detaching after fork from child process 30264.
> not found
> - PTRACE_LDT...Detaching after fork from child process 30265.
> not found
> UML running in SKAS0 mode
> Linux version 2.6.24.3 ([EMAIL PROTECTED]) (gcc version 4.2.1) #1 Mon Jul 7
> 19:06:46 PDT 2008
> Built 1 zonelists in Zone order, mobility grouping on. Total pages: 32512
> Kernel command line: mem=128M eth0=mcast NI=5 root=98:0
> PID hash table entries: 512 (order: 9, 2048 bytes)
> Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
> Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
> Memory: 115384k available
> Mount-cache hash table entries: 512
> Checking for host processor cmov support...Yes
> Checking for host processor xmm support...No
> Checking that host ptys support output SIGIO...Yes
> Checking that host ptys support SIGIO on close...No, enabling workaround
> net_namespace: 64 bytes
> /usr/include/linux/aio_abi.h not present during build
> 2.6 host AIO support not used - falling back to I/O thread
> NET: Registered protocol family 16
> NET: Registered protocol family 2
> Time: itimer clocksource has been installed.
> IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
> TCP established hash table entries: 4096 (order: 3, 32768 bytes)
> TCP bind hash table entries: 4096 (order: 2, 16384 bytes)
> TCP: Hash tables configured (established 4096 bind 4096)
> TCP reno registered
> Checking host MADV_REMOVE support...<3>MADV_REMOVE failed, err = -22
> Can't release memory to the host - memory hotplug won't be supported
> mconsole (version 2) initialized on /home/darodrig/.uml/HUa8DH/mconsole
> Host TLS support detected
> Detected host type: i386
> VFS: Disk quotas dquot_6.5.1
> Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
> io scheduler noop registered
> io scheduler anticipatory registered (default)
> io scheduler deadline registered
> io scheduler cfq registered
> TCP cubic registered
> NET: Registered protocol family 1
> NET: Registered protocol family 10
> lo: Disabled Privacy Extensions
> IPv6 over IPv4 tunneling driver
> sit0: Disabled Privacy Extensions
> NET: Registered protocol family 17
> Initialized stdio console driver
> Console initialized on /dev/tty0
> console [tty0] enabled
> Initializing software serial port version 1
> Configured mcast device: 239.192.168.1:1102-1
> Choosing a random ethernet address for device eth0
> Netdevice 0 (36:f0:ec:94:c4:9e) : mcast backend multicast address:
> 239.192.168.1:1102, TTL:1
> console [mc-1] enabled
> Couldn't stat "root_fs" : err = 2
> Failed to initialize ubd device 0 :Couldn't determine size of device's file
> Detaching after fork from child process 30269.
> line_ioctl: tty0: unknown
> ioctl: 0x541e
> Doing NI Startup...
> Finishing Startup NI 5
> Serial line 0 assigned device '/dev/pts/9'
> ;
>
>
> ni login: admin
> Password:
>
>
> I5 # loadmodule
> Initializing with Board Type: 0x5555
> Loading module qdisp with parameter qdisp_board_type=0x5555 slot=5 .
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x0805c2bb in copy_chunk_from_user (from=148668472, len=4040,
> arg=0xdd8de48) at include/asm/arch/string_32.h:35
> 35 __asm__ __volatile__(
> (gdb) bt
> #0 0x0805c2bb in copy_chunk_from_user (from=148668472, len=4040,
> arg=0xdd8de48) at include/asm/arch/string_32.h:35
> #1 0x0805c11a in do_op_one_page (addr=Variable "addr" is not available.
> )
> at /soft/100/kernel/linux-2.6.24.3/arch/um/kernel/skas/uaccess.c:52
> #2 0x0805c1b0 in do_buffer_op (jmpbuf=0xdd8ddc0, arg_ptr=0xdd8dddc)
> at /soft/100/kernel/linux-2.6.24.3/arch/um/kernel/skas/uaccess.c:80
> #3 0x080687f5 in setjmp_wrapper (proc=0x805c128 <do_buffer_op>)
> at /soft/100/kernel/linux-2.6.24.3/arch/um/os-Linux/util.c:100
> #4 0x0805c27d in buffer_op (addr=134942776, len=129212, is_write=0,
> op=0x805c2a6 <copy_chunk_from_user>, arg=0xdd8de48)
> at /soft/100/kernel/linux-2.6.24.3/arch/um/kernel/skas/uaccess.c:122
> #5 0x0805c350 in copy_from_user (to=0x10800000, from=0x80b1038, n=129212)
> at /soft/100/kernel/linux-2.6.24.3/arch/um/kernel/skas/uaccess.c:146
> #6 0x08090b8d in load_module (umod=0x80b1038, len=129212, uargs=0x80b1008
> "\205�t\016\200x\001")
> at /soft/100/kernel/linux-2.6.24.3/kernel/module.c:1695
> #7 0x0809157a in sys_init_module (umod=0x80b1038, len=129212,
> uargs=0x80b1008 "\205�t\016\200x\001")
> at /soft/100/kernel/linux-2.6.24.3/kernel/module.c:2108
> #8 0x0805c01f in handle_syscall (r=0xde6cde4)
> at /soft/100/kernel/linux-2.6.24.3/arch/um/kernel/skas/syscall.c:35
> #9 0x08069cba in handle_trap (pid=30356, regs=0xde6cde4,
> local_using_sysemu=0)
> at /soft100/kernel/linux-2.6.24.3/arch/um/os-Linux/skas/process.c:168
> #10 0x0806a127 in userspace (regs=0xde6cde4)
> at /soft/100/kernel/linux-2.6.24.3/arch/um/os-Linux/skas/process.c:341
> #11 0x08059abe in fork_handler () at
> /soft/100/kernel/linux-2.6.24.3/arch/um/kernel/process.c:183
> #12 0x05d31045 in ?? ()
>
> Other crash!!!
>
> NI15 # loadmodule
> Initializing with Board Type: 0x52012001
> Loading module qdisp with parameter qdisp_board_type=0x52012001 slot=15 ...
> queue_dispatch: Allocated 255 12KB packet buffers
> Qdispatcher loaded
> NI15 # Slab corruption: size-32768 start=0fcb0000, len=32768
> 000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>
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