Greetings, This looks like a pretty old bug and dates back to v2.6.39. (older kernels cannot be tested due to build problems) [ 6.100211] ------------[ cut here ]------------ [ 6.101009] Kernel BUG at b144dd6f [verbose debug info unavailable] [ 6.101189] invalid opcode: 0000 [#1] DEBUG_PAGEALLOC [ 6.101189] Pid: 1, comm: swapper Not tainted 3.7.0-rc5 #1 Bochs Bochs [ 6.101189] EIP: 0060:[] EFLAGS: 00010286 CPU: 0 [ 6.101189] EIP is at mtd_do_chip_probe+0xb/0x10 [ 6.101189] EAX: b1c4b71c EBX: b1c4b338 ECX: 00000001 EDX: b1c4b330 [ 6.101189] ESI: b1c4b71c EDI: b1b8f3d9 EBP: bbc2bf3c ESP: bbc2bf00 [ 6.101189] DS: 007b ES: 007b FS: 0000 GS: 00e0 SS: 0068 [ 6.101189] CR0: 8005003b CR2: 00000000 CR3: 01f51000 CR4: 00000690 [ 6.101189] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 [ 6.101189] DR6: ffff0ff0 DR7: 00000400 [ 6.101189] Process swapper (pid: 1, ti=bbc2a000 task=bbc60000 task.ti=bbc2a000) [ 6.101189] Stack: [ 6.101189] 00000002 00000000 00000000 00000000 bbc60000 00000000 00000000 b1c4b308 [ 6.101189] 00000000 b1b8f3d9 bbc2bf38 b11bb431 b1c4b308 b1c4b71c bbc2bf44 bbc2bf44 [ 6.101189] b144abb6 bbc2bf58 b144ab5c 00000000 b1ee1540 00000000 bbc2bf7c b1ee162b [ 6.101189] Call Trace: [ 6.101189] [] ? do_raw_spin_unlock+0xd1/0x108 [ 6.101189] [] cfi_probe+0x12/0x14 [ 6.101189] [] do_map_probe+0x8c/0x95 [ 6.101189] [] ? physmap_init+0x61/0x61 [ 6.101189] [] init_sbc_gxx+0xeb/0x13d [ 6.101189] [] do_one_initcall+0x74/0x16e [ 6.101189] [] ? kernel_init+0xcf/0x2d5 [ 6.101189] [] kernel_init+0xe5/0x2d5 [ 6.101189] [] ret_from_kernel_thread+0x1b/0x28 [ 6.101189] [] ? rest_init+0xab/0xab [ 6.101189] Code: 8c 53 fe ff ff 8b 45 e0 c7 40 44 e8 b3 c4 b1 89 f8 e8 cb ee ff ff 8d 65 f4 5b 5e 5f 5d c3 90 90 55 89 e5 83 ec 3c 3e 8d 74 26 00 <0f> 0b 90 90 90 55 89 e5 3e 8d 74 26 00 8b 80 dc 00 00 00 5d 03 [ 6.101189] EIP: [] mtd_do_chip_probe+0xb/0x10 SS:ESP 0068:bbc2bf00 Thanks, Fengguang