DDP - "No backend type associated with device type cpu" with new Model Phi 1.5 despite everything loaded on GPUs
Labels: oncall: distributed

### 🐛 Describe the bug

When training a new Model [PHI 1.5](https://huggingface.co/microsoft/phi-1_5) with Transformers via accelerate/axolotl, I get the following error

`No backend type associated with device type cpu`.

(I am running on 2 RTX 4090s without P2P).
Training with only 1 GPU runs fine and training for Llama-based models also runs fine with the same setup and accelerate.

Debugging shows, that `DistributedDataParallel` has:
```
device: (type='cuda', index=0)
device_type: 'cuda'
```

Full stacktrace:

```python
Exception has occurred: RuntimeError
No backend type associated with device type cpu
  File "/usr/local/lib/python3.10/dist-packages/torch/nn/parallel/distributed.py", line 1980, in _distributed_broadcast_coalesced
    dist._broadcast_coalesced(
  File "/usr/local/lib/python3.10/dist-packages/torch/nn/parallel/distributed.py", line 2064, in _default_broadcast_coalesced
    self._distributed_broadcast_coalesced(bufs, bucket_size, authoritative_rank)
  File "/usr/local/lib/python3.10/dist-packages/torch/nn/parallel/distributed.py", line 2043, in _sync_module_buffers
    self._default_broadcast_coalesced(authoritative_rank=authoritative_rank)
  File "/usr/local/lib/python3.10/dist-packages/torch/nn/parallel/distributed.py", line 2039, in _sync_buffers
    self._sync_module_buffers(authoritative_rank)
  File "/usr/local/lib/python3.10/dist-packages/torch/nn/parallel/distributed.py", line 1408, in _pre_forward
    self._sync_buffers()
  File "/usr/local/lib/python3.10/dist-packages/torch/nn/parallel/distributed.py", line 1513, in forward
    inputs, kwargs = self._pre_forward(*inputs, **kwargs)
  File "/usr/local/lib/python3.10/dist-packages/torch/nn/modules/module.py", line 1511, in _call_impl
    return forward_call(*args, **kwargs)
  File "/usr/local/lib/python3.10/dist-packages/torch/nn/modules/module.py", line 1502, in _wrapped_call_impl
    return self._call_impl(*args, **kwargs)
  File "/usr/local/lib/python3.10/dist-packages/transformers/trainer.py", line 2760, in compute_loss
    outputs = model(**inputs)
  File "/workspace/axolotl/src/axolotl/utils/trainer.py", line 294, in compute_loss
    return super().compute_loss(model, inputs, return_outputs=return_outputs)
  File "/usr/local/lib/python3.10/dist-packages/transformers/trainer.py", line 2735, in training_step
    loss = self.compute_loss(model, inputs)
  File "/usr/local/lib/python3.10/dist-packages/transformers/trainer.py", line 1874, in _inner_training_loop
    tr_loss_step = self.training_step(model, inputs)
  File "/usr/local/lib/python3.10/dist-packages/transformers/trainer.py", line 1574, in train
    return inner_training_loop(
  File "/workspace/axolotl/src/axolotl/train.py", line 120, in train
    trainer.train(resume_from_checkpoint=resume_from_checkpoint)
  File "/workspace/axolotl/scripts/finetune.py", line 274, in do_cli
    train(cfg=parsed_cfg, cli_args=parsed_cli_args, dataset_meta=dataset_meta)
  File "/usr/local/lib/python3.10/dist-packages/fire/core.py", line 691, in _CallAndUpdateTrace
    component = fn(*varargs, **kwargs)
  File "/usr/local/lib/python3.10/dist-packages/fire/core.py", line 475, in _Fire
    component, remaining_args = _CallAndUpdateTrace(
  File "/usr/local/lib/python3.10/dist-packages/fire/core.py", line 141, in Fire
    component_trace = _Fire(component, args, parsed_flag_args, context, name)
  File "/workspace/axolotl/scripts/finetune.py", line 278, in <module>
    fire.Fire(do_cli)
RuntimeError: No backend type associated with device type cpu
```


### Versions

Collecting environment information...

/usr/lib/x86_64-linux-gnu/libcudnn_adv_infer.so.8.9.3
/usr/lib/x86_64-linux-gnu/libcudnn_adv_train.so.8.9.3
/usr/lib/x86_64-linux-gnu/libcudnn_cnn_infer.so.8.9.3
/usr/lib/x86_64-linux-gnu/libcudnn_cnn_train.so.8.9.3
/usr/lib/x86_64-linux-gnu/libcudnn_ops_infer.so.8.9.3
/usr/lib/x86_64-linux-gnu/libcudnn_ops_train.so.8.9.3
HIP runtime version: N/A
MIOpen runtime version: N/A
Is XNNPACK available: True

CPU:
Architecture:                       x86_64
CPU op-mode(s):                     32-bit, 64-bit
Address sizes:                      48 bits physical, 48 bits virtual
Byte Order:                         Little Endian
CPU(s):                             32
On-line CPU(s) list:                0-31
Vendor ID:                          AuthenticAMD
Model name:                         AMD Ryzen 9 7950X 16-Core Processor
CPU family:                         25
Model:                              97
Thread(s) per core:                 2
Core(s) per socket:                 16
Socket(s):                          1
Stepping:                           2
BogoMIPS:                           8983.47
Flags:                              fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf rapl pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc mwaitx cpb cat_l3 cdp_l3 hw_pstate ssbd mba ibrs ibpb stibp vmmcall fsgsbase bmi1 avx2 smep bmi2 erms invpcid cqm rdt_a avx512f avx512dq rdseed adx smap avx512ifma clflushopt clwb avx512cd sha_ni avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local avx512_bf16 clzero irperf xsaveerptr rdpru wbnoinvd cppc arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif v_spec_ctrl avx512vbmi umip pku ospke avx512_vbmi2 gfni vaes vpclmulqdq avx512_vnni avx512_bitalg avx512_vpopcntdq rdpid overflow_recov succor smca fsrm flush_l1d
Virtualization:                     AMD-V
L1d cache:                          512 KiB (16 instances)
L1i cache:                          512 KiB (16 instances)
L2 cache:                           16 MiB (16 instances)
L3 cache:                           64 MiB (2 instances)
NUMA node(s):                       1
NUMA node0 CPU(s):                  0-31
Vulnerability Gather data sampling: Not affected
Vulnerability Itlb multihit:        Not affected
Vulnerability L1tf:                 Not affected
Vulnerability Mds:                  Not affected
Vulnerability Meltdown:             Not affected
Vulnerability Mmio stale data:      Not affected
Vulnerability Retbleed:             Not affected
Vulnerability Spec store bypass:    Mitigation; Speculative Store Bypass disabled via prctl and seccomp
Vulnerability Spectre v1:           Mitigation; usercopy/swapgs barriers and __user pointer sanitization
Vulnerability Spectre v2:           Mitigation; Retpolines, IBPB conditional, IBRS_FW, STIBP always-on, RSB filling, PBRSB-eIBRS Not affected
Vulnerability Srbds:                Not affected
Vulnerability Tsx async abort:      Not affected

Versions of relevant libraries:
[pip3] mypy-extensions==1.0.0
[pip3] numpy==1.24.4
[pip3] pytorch-quantization==2.1.2
[pip3] torch==2.1.0a0+b5021ba
[pip3] torch-tensorrt==1.5.0.dev0
[pip3] torchdata==0.7.0a0
[pip3] torchtext==0.16.0a0
[pip3] torchvision==0.16.0a0
[pip3] triton==2.1.0
[conda] Could not collect

cc @mrshenli @pritamdamania87 @zhaojuanmao @satgera @rohan-varma @gqchen @aazzolini @osalpekar @jiayisuse @H-Huang @kwen2501 @awgu @penguinwu