ide adapter crash

[marcusoverhagen]

Code from r23143 will, when enabled, crash in vmware:

PCI-IDE: Controller in legacy mode: cmd 0x1f0, ctrl 0x3f6, irq 14
PCI-IDE: bus master base 0x1050
PCI-IDE: init channel...
vm_soft_fault: kernel thread accessing invalid user memory!
vm_page_fault: vm_soft_fault returned error 'Bad address' on fault at 0x0, ip 0x0, write 0, user 0, thread 0x7
PANIC: vm_page_fault: unhandled page fault in kernel space at 0x0, ip 0x0

Welcome to Kernel Debugging Land...
Running on CPU 0
kdebug> sc
stack trace for thread 0x7 "main2"
    kernel stack: 0x80144000 to 0x80148000
frame            caller     <image>:function + offset
80146d24 (+  52) 8007b33c   <kernel>:invoke_command + 0x0074
80146d58 (+  48) 8007b45a   <kernel>:kernel_debugger_loop + 0x00de
80146d88 (+  32) 8007bf2e   <kernel>:kernel_debugger + 0x00b6
80146da8 (+ 192) 8007be6d   <kernel>:panic + 0x0029
80146e68 (+  64) 800560e2   <kernel>:vm_page_fault + 0x00aa
80146ea8 (+ 176) 80084a87   <kernel>:i386_handle_trap + 0x0217
iframe at 0x80146f60 (end = 0x80146fb4)
 eax 0x0            ebx 0x80310604      ecx 0x9080b780   edx 0x9080bb80
 esi 0x800aa280     edi 0x90819920      ebp 0x80146fe8   esp 0x80146f90
 eip 0x0         eflags 0x210246   
 vector: 0xe, error code: 0x0
80146f58 (+ 144) 00000000
80146fe8 (+  64) 80274583   <ide_adapter>:ide_adapter_init_controller + 0x00a7
80147028 (+  48) 802678d1   <generic_ide_pci>:init_controller + 0x002d
80147058 (+  64) 80063334   <kernel>:load_driver_int + 0x0090
80147098 (+  48) 8006348a   <kernel>:pnp_load_driver + 0x00ea
801470c8 (+  80) 80273f11   <ide_adapter>:ide_adapter_init_channel + 0x00dd
80147118 (+  64) 8026783d   <generic_ide_pci>:init_channel + 0x0035
80147158 (+  64) 80063334   <kernel>:load_driver_int + 0x0090
80147198 (+  48) 8006348a   <kernel>:pnp_load_driver + 0x00ea
801471c8 (+  80) 8026dc6e   <ide>:ide_sim_init_bus + 0x02b6
80147218 (+  64) 80063334   <kernel>:load_driver_int + 0x0090
80147258 (+  48) 8006348a   <kernel>:pnp_load_driver + 0x00ea
80147288 (+  80) 80349057   <scsi>:scsi_init_bus + 0x023b
801472d8 (+  64) 80063334   <kernel>:load_driver_int + 0x0090
80147318 (+  48) 8006348a   <kernel>:pnp_load_driver + 0x00ea
80147348 (+  48) 80067562   <kernel>:scan_bus + 0x001e
80147378 (+  64) 800676fb   <kernel>:scan + 0x0073
801473b8 (+  32) 80067844   <kernel>:dm_register_child_devices + 0x0014
801473d8 (+  64) 800672fd   <kernel>:dm_register_node + 0x00f9
80147418 (+ 208) 80274282   <ide_adapter>:ide_adapter_publish_channel + 0x0132
801474e8 (+ 144) 802744ad   <ide_adapter>:ide_adapter_detect_channel + 0x021d
80147578 (+ 144) 80274abf   <ide_adapter>:ide_adapter_probe_controller + 0x01cb
80147608 (+  80) 8026798b   <generic_ide_pci>:probe_controller + 0x0053
80147658 (+  64) 80066554   <kernel>:register_supporting_child_devices__FP16device_node_infoP4list + 0x00dc
80147698 (+ 240) 80066dba   <kernel>:probe_for_driver_modules__FPCc + 0x00ae
80147788 (+ 112) 800670f6   <kernel>:probe_for_device_type + 0x003a
801477f8 (+  80) 8003951c   <kernel>:scan_for_drivers__FP11devfs_vnode + 0x0064
80147848 (+  64) 8003a551   <kernel>:devfs_lookup__FPvT0PCcPxPi + 0x005d
80147888 (+ 112) 80041f81   <kernel>:vnode_path_to_vnode__FP5vnodePcbiPP5vnodePxPi + 0x0159
801478f8 (+  64) 800422c6   <kernel>:path_to_vnode__FPcbPP5vnodePxT1 + 0x00de
80147938 (+  64) 80042a1d   <kernel>:fd_and_path_to_vnode__FiPcbPP5vnodePxT2 + 0x0061
80147978 (+  64) 80046b25   <kernel>:common_path_read_stat__FiPcbP4statT2 + 0x0031
801479b8 (+ 144) 8004983c   <kernel>:_kern_read_stat + 0x00a0
80147a48 (+  64) 8008f433   <kernel>:_lstat + 0x001f
80147a88 (+  32) 8008f3d4   <kernel>:lstat + 0x0018
80147aa8 (+ 160) 8006ef39   <kernel>:_Scan__Q38BPrivate10DiskDevice18KDiskDeviceManagerPCc + 0x0031
80147b48 (+  80) 8006e8c7   <kernel>:InitialDeviceScan__Q38BPrivate10DiskDevice18KDiskDeviceManager + 0x003f
80147b98 (+ 128) 8004c435   <kernel>:get_boot_partitions__FP11kernel_argsRt5Stack1ZPQ38BPrivate10DiskDevice10KPartition + 0x02f5
80147c18 (+ 816) 8004c6dd   <kernel>:vfs_mount_boot_file_system + 0x0031
80147f48 (+ 144) 800259f9   <kernel>:main2 + 0x00d1
80147fd8 (+  32) 80034443   <kernel>:_create_kernel_thread_kentry__Fv + 0x001b
80147ff8 (+2146140168) 800343d8   <kernel>:thread_kthread_exit__Fv + 0x0000
kdebug>