From Bugzilla Helper: User-Agent: Mozilla/4.77 [en] (X11; U; Linux 2.4.3-12 i686) Description of problem: On an HP Omnobook 4150 laptop, booting standard RH-7.1 kernel 2.4.3-12 (haven't tried others) and loading the ide-cd and cdrom modules, and unloading cdrom causes an Oops (Unable to handle kernel NULL pointer). Version-Release number of selected component (if applicable): 2.4.3-12 How reproducible: Always Steps to Reproduce: 1. Boot laptop without the CDROM drive inserted 2. insmod cdrom; insmod ide-cd; rmmod ide-cd 3. rmmod cdrom -> segmentation fault and kernel oops Additional info: Kernel command line: auto BOOT_IMAGE=rh-7.1 ro root=301 BOOT_FILE=/boot/vmlinuz-2.4.3-12 The oops analysis by ksymoops on kernel 2.4.3-12 gives: ksymoops 2.4.0 on i686 2.4.3-12. Options used -v /boot/vmlinux-2.4.3-12 (specified) -k /home/sun1/dsanta/ksyms (specified) -l /home/sun1/dsanta/modules (specified) -o /lib/modules/2.4.3-12/ (specified) -m /boot/System.map-2.4.3-12 (specified) Warning (compare_maps): mismatch on symbol partition_name , ksyms_base says c01af700, vmlinux says c0151680. Ignoring ksyms_base entry Warning (compare_maps): mismatch on symbol proc_irda , irda says d09358fc, /lib/modules/2.4.3-12/kernel/net/irda/irda.o says d0934f3c. Ignoring /lib/modules/2.4.3-12/kernel/net/irda/irda.o entry Warning (compare_maps): mismatch on symbol nlmsvc_grace_period , lockd says d08f7994, /lib/modules/2.4.3-12/kernel/fs/lockd/lockd.o says d08f6e00. Ignoring /lib/modules/2.4.3-12/kernel/fs/lockd/lockd.o entry Warning (compare_maps): mismatch on symbol nlmsvc_ops , lockd says d08f7990, /lib/modules/2.4.3-12/kernel/fs/lockd/lockd.o says d08f6dfc. Ignoring /lib/modules/2.4.3-12/kernel/fs/lockd/lockd.o entry Warning (compare_maps): mismatch on symbol nlmsvc_timeout , lockd says d08f7998, /lib/modules/2.4.3-12/kernel/fs/lockd/lockd.o says d08f6e04. Ignoring /lib/modules/2.4.3-12/kernel/fs/lockd/lockd.o entry Warning (compare_maps): mismatch on symbol nfs_debug , sunrpc says d08c7120, /lib/modules/2.4.3-12/kernel/net/sunrpc/sunrpc.o says d08c6de0. Ignoring /lib/modules/2.4.3-12/kernel/net/sunrpc/sunrpc.o entry Warning (compare_maps): mismatch on symbol nfsd_debug , sunrpc says d08c7124, /lib/modules/2.4.3-12/kernel/net/sunrpc/sunrpc.o says d08c6de4. Ignoring /lib/modules/2.4.3-12/kernel/net/sunrpc/sunrpc.o entry Warning (compare_maps): mismatch on symbol nlm_debug , sunrpc says d08c7128, /lib/modules/2.4.3-12/kernel/net/sunrpc/sunrpc.o says d08c6de8. Ignoring /lib/modules/2.4.3-12/kernel/net/sunrpc/sunrpc.o entry Warning (compare_maps): mismatch on symbol rpc_debug , sunrpc says d08c711c, /lib/modules/2.4.3-12/kernel/net/sunrpc/sunrpc.o says d08c6ddc. Ignoring /lib/modules/2.4.3-12/kernel/net/sunrpc/sunrpc.o entry Warning (compare_maps): mismatch on symbol rpc_garbage_args , sunrpc says d08c70fc, /lib/modules/2.4.3-12/kernel/net/sunrpc/sunrpc.o says d08c6dbc. Ignoring /lib/modules/2.4.3-12/kernel/net/sunrpc/sunrpc.o entry Warning (compare_maps): mismatch on symbol rpc_success , sunrpc says d08c70ec, /lib/modules/2.4.3-12/kernel/net/sunrpc/sunrpc.o says d08c6dac. Ignoring /lib/modules/2.4.3-12/kernel/net/sunrpc/sunrpc.o entry Warning (compare_maps): mismatch on symbol rpc_system_err , sunrpc says d08c7100, /lib/modules/2.4.3-12/kernel/net/sunrpc/sunrpc.o says d08c6dc0. Ignoring /lib/modules/2.4.3-12/kernel/net/sunrpc/sunrpc.o entry Warning (compare_maps): mismatch on symbol xdr_one , sunrpc says d08c70e4, /lib/modules/2.4.3-12/kernel/net/sunrpc/sunrpc.o says d08c6da4. Ignoring /lib/modules/2.4.3-12/kernel/net/sunrpc/sunrpc.o entry Warning (compare_maps): mismatch on symbol xdr_two , sunrpc says d08c70e8, /lib/modules/2.4.3-12/kernel/net/sunrpc/sunrpc.o says d08c6da8. Ignoring /lib/modules/2.4.3-12/kernel/net/sunrpc/sunrpc.o entry Warning (compare_maps): mismatch on symbol xdr_zero , sunrpc says d08c70e0, /lib/modules/2.4.3-12/kernel/net/sunrpc/sunrpc.o says d08c6da0. Ignoring /lib/modules/2.4.3-12/kernel/net/sunrpc/sunrpc.o entry Warning (compare_maps): mismatch on symbol usb_devfs_handle , usbcore says d084dc80, /lib/modules/2.4.3-12/kernel/drivers/usb/usbcore.o says d084d7a0. Ignoring /lib/modules/2.4.3-12/kernel/drivers/usb/usbcore.o entry Unable to handle kernel NULL pointer dereference at virtual address 00000008 c011a345 Oops: 0000 CPU: 0 EIP: 0010:[<c011a345>] Using defaults from ksymoops -t elf32-i386 -a i386 EFLAGS: 00210246 eax: 00000000 ebx: 00000000 ecx: 00000000 edx: 00000000 esi: c19cd000 edi: 00000000 ebp: 00000000 esp: cbf63f7c ds: 0018 es: 0018 ss: 0018 Process rmmod (pid: 2171, stackpage=cbf63000) Stack: d08aa000 d08ae5bb 00000000 d08ae5fa 00000000 d08b0240 c011792e d08aa000 c19cd000 00000000 c0116e19 d08aa000 00000000 cbf62000 bffff6b5 00000001 bfffe458 c0106d2b bffff6b5 0805f168 00000131 bffff6b5 00000001 bfffe458 Call Trace: [<d08aa000>] [<d08ae5bb>] [<d08ae5fa>] [<d08b0240>] [<c011792e>] [<d08aa000>] [<c0116e19>] [<d08aa000>] [<c0106d2b>] Code: 8b 53 08 8b 43 04 89 50 04 89 02 8b 0d 94 5c 2a c0 51 8b 13 >>EIP; c011a345 <unregister_sysctl_table+5/30> <===== Trace; d08aa000 <[serial_cs].data.end+4021/4081> Trace; d08ae5bb <[cdrom]cdrom_sysctl_unregister+b/10> Trace; d08ae5fa <[cdrom]cdrom_exit+1a/1f> Trace; d08b0240 <[cdrom].rodata.start+1a20/1a5f> Trace; c011792e <free_module+1e/d0> Trace; d08aa000 <[serial_cs].data.end+4021/4081> Trace; c0116e19 <sys_delete_module+109/1e0> Trace; d08aa000 <[serial_cs].data.end+4021/4081> Trace; c0106d2b <system_call+33/38> Code; c011a345 <unregister_sysctl_table+5/30> 00000000 <_EIP>: Code; c011a345 <unregister_sysctl_table+5/30> <===== 0: 8b 53 08 mov 0x8(%ebx),%edx <===== Code; c011a348 <unregister_sysctl_table+8/30> 3: 8b 43 04 mov 0x4(%ebx),%eax Code; c011a34b <unregister_sysctl_table+b/30> 6: 89 50 04 mov %edx,0x4(%eax) Code; c011a34e <unregister_sysctl_table+e/30> 9: 89 02 mov %eax,(%edx) Code; c011a350 <unregister_sysctl_table+10/30> b: 8b 0d 94 5c 2a c0 mov 0xc02a5c94,%ecx Code; c011a356 <unregister_sysctl_table+16/30> 11: 51 push %ecx Code; c011a357 <unregister_sysctl_table+17/30> 12: 8b 13 mov (%ebx),%edx 16 warnings issued. Results may not be reliable.
Had that SegFault, too, upon "rmmod cdrom" while testing IDE/ATAPT SCSI emulation set-up.