Executing the following script makes all the 8 CPU cores run 100% for 1 or 2 seconds then macOS 11.5.1 (20G80) crashes (on a MacBook Air M1 from December 2020).
Note that this machine has 8 cores (4 performance cores and 4 efficiency cores). Running with OPENBLAS_NUM_THREADS=n set with n <= 4 runs fine and quickly.
With n == 5, the code runs significantly slower.
With n>=6, I get the full system crash almost 100% of the time, sometimes at the 2nd or 3rd iteration of the loop but mostly at the first iteration.
Note that I do not reproduce the crash when running the same code with scipy installed from conda-forge using the macos arm64 installer of miniforge.
Also note that there is probably a problem with the OpenBLAS binary of the numpy wheel because threadpoolctl cannot find the version information:
❯ python -m threadpoolctl -i scipy
[
{
"filepath": "/Users/ogrisel/miniforge3/envs/tmp/lib/python3.9/site-packages/numpy/.dylibs/libopenblas64_.0.dylib",
"prefix": "libopenblas",
"user_api": "blas",
"internal_api": "openblas",
"version": null,
"num_threads": null,
"threading_layer": "unknown",
"architecture": null
}
]
Install the scipy nightly build wheel (or download and install a local copy from this archive):
❯ pip install --pre -i https://pypi.anaconda.org/scipy-wheels-nightly/simple scipy
from #13409 (comment).
Then try to execute this script:
from time import perf_counter
import numpy as np
from scipy.sparse.linalg import eigsh
n_samples, n_features = 2000, 10
rng = np.random.default_rng(0)
X = rng.normal(size=(n_samples, n_features))
K = X @ X.T
for i in range(10):
print("running eigsh...")
tic = perf_counter()
s, _ = eigsh(K, 3, which="LA", tol=0)
toc = perf_counter()
print(f"computed {s} in {toc - tic:.3f} s") Error message
Here is the panic report from macOS after system reboot:
panic(cpu 3 caller 0xfffffe0018fab460): "Spinlock timeout after 12585145 ticks, 0xfffffe001cd04588 = fffffe1668958661"
Debugger message: panic
Memory ID: 0xff
OS release type: User
OS version: 20G80
Kernel version: Darwin Kernel Version 20.6.0: Wed Jun 23 00:26:27 PDT 2021; root:xnu-7195.141.2~5/RELEASE_ARM64_T8101
Fileset Kernelcache UUID: E46841F89DC3FD7ACEC6F404AC995579
Kernel UUID: AC4A14A7-8A8E-3AE6-85A6-55E6B2502BF9
iBoot version: iBoot-6723.140.2
secure boot?: YES
Paniclog version: 13
KernelCache slide: 0x0000000011330000
KernelCache base: 0xfffffe0018334000
Kernel slide: 0x0000000011e78000
Kernel text base: 0xfffffe0018e7c000
Kernel text exec base: 0xfffffe0018f48000
mach_absolute_time: 0xa9b77fbf5
Epoch Time: sec usec
Boot : 0x613143f7 0x00087da9
Sleep : 0x00000000 0x00000000
Wake : 0x00000000 0x00000000
Calendar: 0x61314b5c 0x00031a5d
CORE 0 recently retired instr at 0xfffffe00190bad6c
CORE 1 recently retired instr at 0xfffffe00190bad6c
CORE 2 recently retired instr at 0xfffffe00190bad6c
CORE 3 recently retired instr at 0xfffffe00190b96a4
CORE 4 recently retired instr at 0xfffffe00190bad70
CORE 5 recently retired instr at 0xfffffe00190bad70
CORE 6 recently retired instr at 0xfffffe00190bad70
CORE 7 recently retired instr at 0xfffffe00190bad70
CORE 0 PVH locks held: None
CORE 1 PVH locks held: None
CORE 2 PVH locks held: None
CORE 3 PVH locks held: None
CORE 4 PVH locks held: None
CORE 5 PVH locks held: None
CORE 6 PVH locks held: None
CORE 7 PVH locks held: None
CORE 0: PC=0xfffffe0018f911f0, LR=0xfffffe0018f911f0, FP=0xfffffe307bbebd50
CORE 1: PC=0xfffffe0018f911f0, LR=0xfffffe0018f911f0, FP=0xfffffe30b50e3d50
CORE 2: PC=0xfffffe0018f911f0, LR=0xfffffe0018f911f0, FP=0xfffffe3087d13d50
CORE 3 is the one that panicked. Check the full backtrace for details.
CORE 4: PC=0xfffffe00190a7204, LR=0xfffffe00190a71e0, FP=0xfffffe3087ca3d50
CORE 5: PC=0xfffffe0018f91200, LR=0xfffffe00194bb268, FP=0xfffffe30b596bdb0
CORE 6: PC=0xfffffe0018f91200, LR=0xfffffe00194bb268, FP=0xfffffe30b5a1bdb0
CORE 7: PC=0x00000001034415bc, LR=0x0000000103441564, FP=0x000000016d7890d0
Panicked task 0xfffffe166ecfbac8: 4385 pages, 15 threads: pid 5061: python3.9
Panicked thread: 0xfffffe166ef73960, backtrace: 0xfffffe30b6a536d0, tid: 25548
lr: 0xfffffe0018f96b68 fp: 0xfffffe30b6a53740
lr: 0xfffffe0018f9694c fp: 0xfffffe30b6a537b0
lr: 0xfffffe00190c01c8 fp: 0xfffffe30b6a537d0
lr: 0xfffffe00190b1674 fp: 0xfffffe30b6a53880
lr: 0xfffffe0018f4f7e8 fp: 0xfffffe30b6a53890
lr: 0xfffffe0018f965dc fp: 0xfffffe30b6a53c20
lr: 0xfffffe0018f965dc fp: 0xfffffe30b6a53c90
lr: 0xfffffe0019748e80 fp: 0xfffffe30b6a53cb0
lr: 0xfffffe0018fab460 fp: 0xfffffe30b6a53ce0
lr: 0xfffffe0018fab2cc fp: 0xfffffe30b6a53d00
lr: 0xfffffe0018f91174 fp: 0xfffffe30b6a53d50
lr: 0xfffffe00194bb268 fp: 0xfffffe30b6a53db0
lr: 0xfffffe001959e0e8 fp: 0xfffffe30b6a53e40
lr: 0xfffffe00190b1350 fp: 0xfffffe30b6a53ef0
lr: 0xfffffe0018f4f7e8 fp: 0xfffffe30b6a53f00
last started kext at 694061903: com.apple.driver.AppleHIDKeyboard 224 (addr 0xfffffe00186a0000, size 16384)
loaded kexts:
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** Stackshot Succeeded ** Bytes Traced 341829 (Uncompressed 886656) **
1.8.0.dev0+1675.774941b 1.22.0.dev0+949.ga90677a0b sys.version_info(major=3, minor=9, micro=6, releaselevel='final', serial=0)
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