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Eval bug: Qwen 3.5 27B GGUF from unsloth hard crash #19906

@snapo

Description

@snapo

Name and Version

./llama.cpp/llama-cli --version
ggml_cuda_init: found 2 CUDA devices:
  Device 0: NVIDIA GeForce RTX 2080 Ti, compute capability 7.5, VMM: yes
  Device 1: NVIDIA GeForce RTX 2080 Ti, compute capability 7.5, VMM: yes
version: 8138 (b68a83e64)
built with GNU 11.4.0 for Linux x86_64

./llama.cpp/llama-server --model "models/Qwen3.5-27B-UD-Q4_K_XL.gguf" --alias "Qwen3.5 27B" --temp 0.6 --top-p 0.95 --min-p 0.01 --top-k 20 --port 16384 --host 0.0.0.0 --ctx-size 4096 --cache-type-k q8_0 --cache-type-v q8_0 --parallel 1 --cont-batching

Operating systems

Linux

GGML backends

CUDA

Hardware

2 x RTX 2080 Ti 22GB vram , 64GB systemram

Models

unsloth/Qwen3.5-27B-GGUF

Same behaviour with :
Qwen3.5-27B-UD-Q4_K_XL.gguf
Qwen3.5-27B-UD-Q5_K_XL.gguf
Qwen3.5-27B-UD-Q8_K_XL.gguf

Problem description & steps to reproduce

hard crash even on ctx size 512 and 1 input token

First Bad Commit

No response

Relevant log output

Logs

ggml_cuda_init: found 2 CUDA devices:
Device 0: NVIDIA GeForce RTX 2080 Ti, compute capability 7.5, VMM: yes
Device 1: NVIDIA GeForce RTX 2080 Ti, compute capability 7.5, VMM: yes
build: 8138 (b68a83e) with GNU 11.4.0 for Linux x86_64
system info: n_threads = 6, n_threads_batch = 6, total_threads = 12

system_info: n_threads = 6 (n_threads_batch = 6) / 12 | CUDA : ARCHS = 500,610,700,750,800,860,890,1200 | USE_GRAPHS = 1 | PEER_MAX_BATCH_SIZE = 128 | CPU : SSE3 = 1 | SSSE3 = 1 | AVX = 1 | AVX2 = 1 | F16C = 1 | FMA = 1 | BMI2 = 1 | LLAMAFILE = 1 | OPENMP = 1 | REPACK = 1 |

Running without SSL
init: using 11 threads for HTTP server
start: binding port with default address family
main: loading model
srv load_model: loading model 'models/Qwen3.5-27B-UD-Q4_K_XL.gguf'
common_init_result: fitting params to device memory, for bugs during this step try to reproduce them with -fit off, or provide --verbose logs if the bug only occurs with -fit on
llama_params_fit_impl: projected memory use with initial parameters [MiB]:
llama_params_fit_impl: - CUDA0 (NVIDIA GeForce RTX 2080 Ti): 22002 total, 7835 used, 13931 free vs. target of 1024
llama_params_fit_impl: - CUDA1 (NVIDIA GeForce RTX 2080 Ti): 22002 total, 9101 used, 12670 free vs. target of 1024
llama_params_fit_impl: projected to use 16936 MiB of device memory vs. 43538 MiB of free device memory
llama_params_fit_impl: targets for free memory can be met on all devices, no changes needed
llama_params_fit: successfully fit params to free device memory
llama_params_fit: fitting params to free memory took 0.65 seconds
llama_model_load_from_file_impl: using device CUDA0 (NVIDIA GeForce RTX 2080 Ti) (0000:23:00.0) - 21844 MiB free
llama_model_load_from_file_impl: using device CUDA1 (NVIDIA GeForce RTX 2080 Ti) (0000:2d:00.0) - 21844 MiB free
llama_model_loader: loaded meta data with 42 key-value pairs and 851 tensors from models/Qwen3.5-27B-UD-Q4_K_XL.gguf (version GGUF V3 (latest))
llama_model_loader: Dumping metadata keys/values. Note: KV overrides do not apply in this output.
llama_model_loader: - kv 0: general.architecture str = qwen35
llama_model_loader: - kv 1: general.type str = model
llama_model_loader: - kv 2: general.sampling.top_k i32 = 20
llama_model_loader: - kv 3: general.sampling.top_p f32 = 0.950000
llama_model_loader: - kv 4: general.sampling.temp f32 = 0.600000
llama_model_loader: - kv 5: general.name str = Qwen3.5-27B
llama_model_loader: - kv 6: general.basename str = Qwen3.5-27B
llama_model_loader: - kv 7: general.quantized_by str = Unsloth
llama_model_loader: - kv 8: general.size_label str = 27B
llama_model_loader: - kv 9: general.license str = apache-2.0
llama_model_loader: - kv 10: general.license.link str = https://huggingface.co/Qwen/Qwen3.5-2...
llama_model_loader: - kv 11: general.repo_url str = https://huggingface.co/unsloth
llama_model_loader: - kv 12: general.tags arr[str,1] = ["image-text-to-text"]
llama_model_loader: - kv 13: qwen35.block_count u32 = 64
llama_model_loader: - kv 14: qwen35.context_length u32 = 262144
llama_model_loader: - kv 15: qwen35.embedding_length u32 = 5120
llama_model_loader: - kv 16: qwen35.feed_forward_length u32 = 17408
llama_model_loader: - kv 17: qwen35.attention.head_count u32 = 24
llama_model_loader: - kv 18: qwen35.attention.head_count_kv u32 = 4
llama_model_loader: - kv 19: qwen35.rope.dimension_sections arr[i32,4] = [11, 11, 10, 0]
llama_model_loader: - kv 20: qwen35.rope.freq_base f32 = 10000000.000000
llama_model_loader: - kv 21: qwen35.attention.layer_norm_rms_epsilon f32 = 0.000001
llama_model_loader: - kv 22: qwen35.attention.key_length u32 = 256
llama_model_loader: - kv 23: qwen35.attention.value_length u32 = 256
llama_model_loader: - kv 24: qwen35.ssm.conv_kernel u32 = 4
llama_model_loader: - kv 25: qwen35.ssm.state_size u32 = 128
llama_model_loader: - kv 26: qwen35.ssm.group_count u32 = 16
llama_model_loader: - kv 27: qwen35.ssm.time_step_rank u32 = 48
llama_model_loader: - kv 28: qwen35.ssm.inner_size u32 = 6144
llama_model_loader: - kv 29: qwen35.full_attention_interval u32 = 4
llama_model_loader: - kv 30: qwen35.rope.dimension_count u32 = 64
llama_model_loader: - kv 31: tokenizer.ggml.model str = gpt2
llama_model_loader: - kv 32: tokenizer.ggml.pre str = qwen35
llama_model_loader: - kv 33: tokenizer.ggml.tokens arr[str,248320] = ["!", """, "#", "$", "%", "&", "'", ...
llama_model_loader: - kv 34: tokenizer.ggml.token_type arr[i32,248320] = [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, ...
llama_model_loader: - kv 35: tokenizer.ggml.merges arr[str,247587] = ["Ġ Ġ", "ĠĠ ĠĠ", "i n", "Ġ t",...
llama_model_loader: - kv 36: tokenizer.ggml.eos_token_id u32 = 248046
llama_model_loader: - kv 37: tokenizer.ggml.padding_token_id u32 = 248044
llama_model_loader: - kv 38: tokenizer.ggml.add_bos_token bool = false
llama_model_loader: - kv 39: tokenizer.chat_template str = {%- set image_count = namespace(value...
llama_model_loader: - kv 40: general.quantization_version u32 = 2
llama_model_loader: - kv 41: general.file_type u32 = 15
llama_model_loader: - type f32: 353 tensors
llama_model_loader: - type q4_K: 359 tensors
llama_model_loader: - type q5_K: 96 tensors
llama_model_loader: - type q6_K: 43 tensors
print_info: file format = GGUF V3 (latest)
print_info: file type = Q4_K - Medium
print_info: file size = 15.57 GiB (4.97 BPW)
load: 0 unused tokens
load: printing all EOG tokens:
load: - 248044 ('<|endoftext|>')
load: - 248046 ('<|im_end|>')
load: - 248063 ('<|fim_pad|>')
load: - 248064 ('<|repo_name|>')
load: - 248065 ('<|file_sep|>')
load: special tokens cache size = 33
load: token to piece cache size = 1.7581 MB
print_info: arch = qwen35
print_info: vocab_only = 0
print_info: no_alloc = 0
print_info: n_ctx_train = 262144
print_info: n_embd = 5120
print_info: n_embd_inp = 5120
print_info: n_layer = 64
print_info: n_head = 24
print_info: n_head_kv = 4
print_info: n_rot = 64
print_info: n_swa = 0
print_info: is_swa_any = 0
print_info: n_embd_head_k = 256
print_info: n_embd_head_v = 256
print_info: n_gqa = 6
print_info: n_embd_k_gqa = 1024
print_info: n_embd_v_gqa = 1024
print_info: f_norm_eps = 0.0e+00
print_info: f_norm_rms_eps = 1.0e-06
print_info: f_clamp_kqv = 0.0e+00
print_info: f_max_alibi_bias = 0.0e+00
print_info: f_logit_scale = 0.0e+00
print_info: f_attn_scale = 0.0e+00
print_info: n_ff = 17408
print_info: n_expert = 0
print_info: n_expert_used = 0
print_info: n_expert_groups = 0
print_info: n_group_used = 0
print_info: causal attn = 1
print_info: pooling type = 0
print_info: rope type = 40
print_info: rope scaling = linear
print_info: freq_base_train = 10000000.0
print_info: freq_scale_train = 1
print_info: n_ctx_orig_yarn = 262144
print_info: rope_yarn_log_mul = 0.0000
print_info: rope_finetuned = unknown
print_info: mrope sections = [11, 11, 10, 0]
print_info: ssm_d_conv = 4
print_info: ssm_d_inner = 6144
print_info: ssm_d_state = 128
print_info: ssm_dt_rank = 48
print_info: ssm_n_group = 16
print_info: ssm_dt_b_c_rms = 0
print_info: model type = ?B
print_info: model params = 26.90 B
print_info: general.name = Qwen3.5-27B
print_info: vocab type = BPE
print_info: n_vocab = 248320
print_info: n_merges = 247587
print_info: BOS token = 11 ','
print_info: EOS token = 248046 '<|im_end|>'
print_info: EOT token = 248046 '<|im_end|>'
print_info: PAD token = 248044 '<|endoftext|>'
print_info: LF token = 198 'Ċ'
print_info: FIM PRE token = 248060 '<|fim_prefix|>'
print_info: FIM SUF token = 248062 '<|fim_suffix|>'
print_info: FIM MID token = 248061 '<|fim_middle|>'
print_info: FIM PAD token = 248063 '<|fim_pad|>'
print_info: FIM REP token = 248064 '<|repo_name|>'
print_info: FIM SEP token = 248065 '<|file_sep|>'
print_info: EOG token = 248044 '<|endoftext|>'
print_info: EOG token = 248046 '<|im_end|>'
print_info: EOG token = 248063 '<|fim_pad|>'
print_info: EOG token = 248064 '<|repo_name|>'
print_info: EOG token = 248065 '<|file_sep|>'
print_info: max token length = 256
load_tensors: loading model tensors, this can take a while... (mmap = true, direct_io = false)
load_tensors: offloading output layer to GPU
load_tensors: offloading 63 repeating layers to GPU
load_tensors: offloaded 65/65 layers to GPU
load_tensors: CPU_Mapped model buffer size = 682.03 MiB
load_tensors: CUDA0 model buffer size = 7353.08 MiB
load_tensors: CUDA1 model buffer size = 7908.45 MiB
............................................................................................
common_init_result: added <|endoftext|> logit bias = -inf
common_init_result: added <|im_end|> logit bias = -inf
common_init_result: added <|fim_pad|> logit bias = -inf
common_init_result: added <|repo_name|> logit bias = -inf
common_init_result: added <|file_sep|> logit bias = -inf
llama_context: constructing llama_context
llama_context: n_seq_max = 1
llama_context: n_ctx = 4096
llama_context: n_ctx_seq = 4096
llama_context: n_batch = 2048
llama_context: n_ubatch = 512
llama_context: causal_attn = 1
llama_context: flash_attn = auto
llama_context: kv_unified = false
llama_context: freq_base = 10000000.0
llama_context: freq_scale = 1
llama_context: n_ctx_seq (4096) < n_ctx_train (262144) -- the full capacity of the model will not be utilized
llama_context: CUDA_Host output buffer size = 0.95 MiB
llama_kv_cache: CUDA0 KV buffer size = 128.00 MiB
llama_kv_cache: CUDA1 KV buffer size = 128.00 MiB
llama_kv_cache: size = 256.00 MiB ( 4096 cells, 16 layers, 1/1 seqs), K (f16): 128.00 MiB, V (f16): 128.00 MiB
llama_memory_recurrent: CUDA0 RS buffer size = 77.93 MiB
llama_memory_recurrent: CUDA1 RS buffer size = 71.70 MiB
llama_memory_recurrent: size = 149.62 MiB ( 1 cells, 64 layers, 1 seqs), R (f32): 5.62 MiB, S (f32): 144.00 MiB
llama_context: pipeline parallelism enabled
sched_reserve: reserving ...
sched_reserve: Flash Attention was auto, set to enabled
sched_reserve: CUDA0 compute buffer size = 228.06 MiB
sched_reserve: CUDA1 compute buffer size = 905.32 MiB
sched_reserve: CUDA_Host compute buffer size = 52.08 MiB
sched_reserve: graph nodes = 12729 (with bs=512), 4713 (with bs=1)
sched_reserve: graph splits = 5
sched_reserve: reserve took 49.71 ms, sched copies = 4
common_init_from_params: warming up the model with an empty run - please wait ... (--no-warmup to disable)
srv load_model: initializing slots, n_slots = 1
common_speculative_is_compat: the target context does not support partial sequence removal
srv load_model: speculative decoding not supported by this context
slot load_model: id 0 | task -1 | new slot, n_ctx = 4096
srv load_model: prompt cache is enabled, size limit: 8192 MiB
srv load_model: use --cache-ram 0 to disable the prompt cache
srv load_model: for more info see https://github.com//pull/16391
init: chat template, example_format: '<|im_start|>system
You are a helpful assistant<|im_end|>
<|im_start|>user
Hello<|im_end|>
<|im_start|>assistant
Hi there<|im_end|>
<|im_start|>user
How are you?<|im_end|>
<|im_start|>assistant

'
srv init: init: chat template, thinking = 1
main: model loaded
main: server is listening on http://0.0.0.0:16384
main: starting the main loop...
srv update_slots: all slots are idle
srv params_from_: Chat format: peg-constructed
slot get_availabl: id 0 | task -1 | selected slot by LRU, t_last = -1
slot launch_slot_: id 0 | task -1 | sampler chain: logits -> penalties -> ?dry -> ?top-n-sigma -> top-k -> ?typical -> top-p -> min-p -> ?xtc -> temp-ext -> dist
slot launch_slot_: id 0 | task 0 | processing task, is_child = 0
slot update_slots: id 0 | task 0 | new prompt, n_ctx_slot = 4096, n_keep = 0, task.n_tokens = 568
slot update_slots: id 0 | task 0 | n_tokens = 0, memory_seq_rm [0, end)
slot update_slots: id 0 | task 0 | prompt processing progress, n_tokens = 56, batch.n_tokens = 56, progress = 0.098592
slot update_slots: id 0 | task 0 | n_tokens = 56, memory_seq_rm [56, end)
slot update_slots: id 0 | task 0 | prompt processing progress, n_tokens = 568, batch.n_tokens = 512, progress = 1.000000
slot update_slots: id 0 | task 0 | prompt done, n_tokens = 568, batch.n_tokens = 512
slot init_sampler: id 0 | task 0 | init sampler, took 0.08 ms, tokens: text = 568, total = 568
/home/snapo/llama/llama.cpp/ggml/src/ggml-cuda/ggml-cuda.cu:97: CUDA error
ggml_cuda_compute_forward: SET failed
CUDA error: an illegal memory access was encountered
current device: 1, in function ggml_cuda_compute_forward at /home/snapo/llama/llama.cpp/ggml/src/ggml-cuda/ggml-cuda.cu:2761
err
[New LWP 3283938]
[New LWP 3283952]
[New LWP 3283953]
[New LWP 3283954]
[New LWP 3283955]
[New LWP 3283956]
[New LWP 3283957]
[New LWP 3283958]
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[New LWP 3283961]
[New LWP 3283962]
[New LWP 3283963]
[New LWP 3283964]
[New LWP 3283965]
[New LWP 3283966]
[New LWP 3283967]
[New LWP 3283968]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
0x00007be4be0ea42f in __GI___wait4 (pid=3284307, stat_loc=0x0, options=0, usage=0x0) at ../sysdeps/unix/sysv/linux/wait4.c:30
30 ../sysdeps/unix/sysv/linux/wait4.c: No such file or directory.
#0 0x00007be4be0ea42f in __GI___wait4 (pid=3284307, stat_loc=0x0, options=0, usage=0x0) at ../sysdeps/unix/sysv/linux/wait4.c:30
30 in ../sysdeps/unix/sysv/linux/wait4.c
#1 0x00005da4f81ac86b in ggml_print_backtrace ()
#2 0x00005da4f81ac9fe in ggml_abort ()
#3 0x00005da4f779fff6 in ggml_cuda_error(char const*, char const*, char const*, int, char const*) ()
#4 0x00005da4f77b0e1f in ggml_cuda_compute_forward(ggml_backend_cuda_context&, ggml_tensor*) ()
#5 0x00005da4f77b4e7e in ggml_cuda_graph_evaluate_and_capture(ggml_backend_cuda_context*, ggml_cgraph*, bool, bool, void const*) ()
#6 0x00005da4f77b722a in ggml_backend_cuda_graph_compute(ggml_backend*, ggml_cgraph*) ()
#7 0x00005da4f81ccdc9 in ggml_backend_sched_compute_splits(ggml_backend_sched*) ()
#8 0x00005da4f7579611 in llama_context::graph_compute(ggml_cgraph*, bool) ()
#9 0x00005da4f7579765 in llama_context::process_ubatch(llama_ubatch const&, llm_graph_type, llama_memory_context_i*, ggml_status&) ()
#10 0x00005da4f7583293 in llama_context::decode(llama_batch const&) ()
#11 0x00005da4f75848d0 in llama_decode ()
#12 0x00005da4f725c841 in server_context_impl::update_slots() ()
#13 0x00005da4f72991b0 in server_queue::start_loop(long) ()
#14 0x00005da4f7159cde in main ()
[Inferior 1 (process 3283937) detached]

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