CLBlast fails on context lengths above 2048 after merging #4256 #4296
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bug
Something isn't working
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Does it work with this patch: diff --git a/llama.cpp b/llama.cpp
index fd905ade..69c45c3f 100644
--- a/llama.cpp
+++ b/llama.cpp
@@ -3813,7 +3813,7 @@ static struct ggml_tensor * llm_build_kqv(
struct ggml_tensor * kq = ggml_mul_mat(ctx, k, q);
cb(kq, "kq", il);
- if (max_alibi_bias > 0.0f) {
+ if (true) {
// temporary branch until we figure out how to handle ggml_alibi through ggml_add
kq = ggml_scale(ctx, kq, kq_scale);
cb(kq, "kq_scaled", il); |
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Nope, unfortunately this did not fix the issue, it still segfaults around the same point. |
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Hm, I don't see what could have affected the OpenCL backend in that change. |
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There's no stack trace. In fact, there's no printout whatsoever, the program simply halts. I tried it again with 0 layers offloaded and it seems to happen too, it still crashes at the same place. CUDA is fine, however. Here's a video of demo.mp4The test text file I used for input is the first 5 sections of the GPL license, which you can find here: I am able to repro this consistently as it crashes at the same place. Reducing the prompt to a shorter one allows it to work. |
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Can confirm this happens for me too. Same command and prompt as @LostRuins. Hardware is RTX 2070S and Intel i7-8700, and I'm using Linux 6.5.9. Happens with Different error followed by a segfault with |
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And |
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I tested more, and I get a coredump with lower |
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Reverting this specific commit: |
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The |
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I'm able to reproduce - looking into it |
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I built with ASan, here's the error traceback I get when running with the command: ./main -m ~/models/openhermes-2-mistral-7b.Q6_K.gguf -c 4096 -b 512 -n 32 -ngl 99 -f test.txtError: Reverted |
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@AlpinDale When running with ASAN, you need to add this env variable: Doing that, I now get the following sanitizer errors, confirming a bug in system_info: n_threads = 8 / 32 | AVX = 1 | AVX2 = 1 | AVX512 = 0 | AVX512_VBMI = 0 | AVX512_VNNI = 0 | FMA = 1 | NEON = 0 | ARM_FMA = 0 | F16C = 1 | FP16_VA = 0 | WASM_SIMD = 0 | BLAS = 1 | SSE3 = 1 | SSSE3 = 1 | VSX = 0 |
sampling:
repeat_last_n = 64, repeat_penalty = 1,100, frequency_penalty = 0,000, presence_penalty = 0,000
top_k = 40, tfs_z = 1,000, top_p = 0,950, min_p = 0,050, typical_p = 1,000, temp = 0,800
mirostat = 0, mirostat_lr = 0,100, mirostat_ent = 5,000
generate: n_ctx = 4096, n_batch = 512, n_predict = 32, n_keep = 0
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==364805==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x62d000fc6580 at pc 0x5620bf18802b bp 0x7fe2cf3f2840 sp 0x7fe2cf3f2830
WRITE of size 4 at 0x62d000fc6580 thread T28
#0 0x5620bf18802a in ggml_vec_cpy_f32 /home/ggerganov/development/github/llama.cpp/ggml.c:1158
#1 0x5620bf22385d in ggml_compute_forward_soft_max_f32 /home/ggerganov/development/github/llama.cpp/ggml.c:10614
#2 0x5620bf2244aa in ggml_compute_forward_soft_max /home/ggerganov/development/github/llama.cpp/ggml.c:10668
#3 0x5620bf25fbbe in ggml_compute_forward /home/ggerganov/development/github/llama.cpp/ggml.c:13905
#4 0x5620bf27e361 in ggml_graph_compute_thread /home/ggerganov/development/github/llama.cpp/ggml.c:15860
#5 0x7fe42b494ac2 in start_thread nptl/pthread_create.c:442
#6 0x7fe42b526a3f (/lib/x86_64-linux-gnu/libc.so.6+0x126a3f)
0x62d000fc6580 is located 0 bytes to the right of 33152-byte region [0x62d000fbe400,0x62d000fc6580)
allocated by thread T0 here:
#0 0x7fe42ccb61e7 in operator new(unsigned long) ../../../../src/libsanitizer/asan/asan_new_delete.cpp:99
#1 0x5620bf14270a in __gnu_cxx::new_allocator<unsigned char>::allocate(unsigned long, void const*) /usr/include/c++/11/ext/new_allocator.h:127
#2 0x5620bf11ee72 in std::allocator_traits<std::allocator<unsigned char> >::allocate(std::allocator<unsigned char>&, unsigned long) /usr/include/c++/11/bits/alloc_traits.h:464
#3 0x5620bf0ea3eb in std::_Vector_base<unsigned char, std::allocator<unsigned char> >::_M_allocate(unsigned long) /usr/include/c++/11/bits/stl_vector.h:346
#4 0x5620bf0a3ffb in std::vector<unsigned char, std::allocator<unsigned char> >::_M_default_append(unsigned long) /usr/include/c++/11/bits/vector.tcc:635
#5 0x5620bf06d1ab in std::vector<unsigned char, std::allocator<unsigned char> >::resize(unsigned long) /usr/include/c++/11/bits/stl_vector.h:940
#6 0x5620bef398d0 in ggml_graph_compute_helper /home/ggerganov/development/github/llama.cpp/llama.cpp:668
#7 0x5620bef8f6b2 in llama_decode_internal /home/ggerganov/development/github/llama.cpp/llama.cpp:5577
#8 0x5620befc9a09 in llama_decode /home/ggerganov/development/github/llama.cpp/llama.cpp:9462
#9 0x5620bedd4eb5 in llama_init_from_gpt_params(gpt_params&) /home/ggerganov/development/github/llama.cpp/common/common.cpp:996
#10 0x5620bed77fc5 in main /home/ggerganov/development/github/llama.cpp/examples/main/main.cpp:187
#11 0x7fe42b429d8f in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58
Thread T28 created by T0 here:
#0 0x7fe42cc58685 in __interceptor_pthread_create ../../../../src/libsanitizer/asan/asan_interceptors.cpp:216
#1 0x5620bf282b56 in ggml_graph_compute /home/ggerganov/development/github/llama.cpp/ggml.c:16094
#2 0x5620bef3994f in ggml_graph_compute_helper /home/ggerganov/development/github/llama.cpp/llama.cpp:672
#3 0x5620bef8f6b2 in llama_decode_internal /home/ggerganov/development/github/llama.cpp/llama.cpp:5577
#4 0x5620befc9a09 in llama_decode /home/ggerganov/development/github/llama.cpp/llama.cpp:9462
#5 0x5620bed8b2fa in main /home/ggerganov/development/github/llama.cpp/examples/main/main.cpp:605
#6 0x7fe42b429d8f in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58
SUMMARY: AddressSanitizer: heap-buffer-overflow /home/ggerganov/development/github/llama.cpp/ggml.c:1158 in ggml_vec_cpy_f32
Shadow bytes around the buggy address:
0x0c5a801f0c60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c5a801f0c70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c5a801f0c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c5a801f0c90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c5a801f0ca0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c5a801f0cb0:[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a801f0cc0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a801f0cd0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a801f0ce0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a801f0cf0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a801f0d00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
Shadow gap: cc
==364805==ABORTING |
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Please confirm that #4307 works |
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Sorry I couldn't help more with the debugging. Anyway #4307 seems to work for me. The segfault no longer occurs. |
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No problem - thank you very much for reporting this issue |
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Inference with CLBlast fails with a segfault after the commit that merged #4256 on context sizes above 2k when all GPU layers are offloaded.
Command line:
C:\test\llama-b1601-bin-win-clblast-x64>main.exe -m E:\LLaMA\models\airoboros-mistral2.2-7b.Q4_K_S.gguf -c 4096 -b 512 -n 32 -ngl 33 -f C:\test\test.txtResult:
Prompt processing starts, and then segfaults halfway around the 2k token mark, before generation begins. Only if the prompt is short enough (less than 2k tokens) it appears to work.
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