__kmp_wait_4_ptr+220 Android运行初始化时有极低概率发生阻塞，引起耗电增加

[sandingman]

error log | 日志或报错信息 | ログ

"DefaultDispatcher-worker-7" daemon prio=5 tid=73 Native
| group="main" sCount=1 ucsCount=0 flags=1 obj=0x3589c58 self=0x6d2501b210
| sysTid=22286 nice=0 cgrp=foreground sched=0/0 handle=0x6b32217180
| state=R schedstat=( 77011544049833 1206052517090 4421671 ) utm=3365862 stm=4335291 core=2 HZ=100
| stack=0x6b31e14000-0x6b31e16000 stackSize=4108KB
| held mutexes=
native: #00 pc 000d718c /apex/com.android.runtime/lib64/bionic/libc.so (sched_yield+12) (BuildId: 1ec1d41f7c9e3e45043ebfef05c0ed3d)
native: #1 pc 01bbe5b8 /data/app/~~PHe8SJ_o7Oc7l_1UdkrJjg==/com.android-_PQCrKqe0nmsgCCWgtPuSg==/lib/arm64/libppocr_ncnn_single_lang.so (__kmp_wait_4_ptr+220) (BuildId: 74434215c6c9e54f851a580dfac1862dea618b2e)
native: #2 pc 01bc537c /data/app/~~PHe8SJ_o7Oc7l_1UdkrJjg==/com.android-_PQCrKqe0nmsgCCWgtPuSg==/lib/arm64/libppocr_ncnn_single_lang.so (__kmp_acquire_ticket_lock+68) (BuildId: 74434215c6c9e54f851a580dfac1862dea618b2e)
native: #3 pc 01bd029c /data/app/~~PHe8SJ_o7Oc7l_1UdkrJjg==/com.android-_PQCrKqe0nmsgCCWgtPuSg==/lib/arm64/libppocr_ncnn_single_lang.so (???) (BuildId: 74434215c6c9e54f851a580dfac1862dea618b2e)
native: #4 pc 00084bf4 /apex/com.android.runtime/lib64/bionic/libc.so (__bionic_atfork_run_prepare+72) (BuildId: 1ec1d41f7c9e3e45043ebfef05c0ed3d)
native: #5 pc 0007c954 /apex/com.android.runtime/lib64/bionic/libc.so (fork+16) (BuildId: 1ec1d41f7c9e3e45043ebfef05c0ed3d)
native: #6 pc 044f9f8c /product/app/TrichromeLibrary64/TrichromeLibrary64.apk (offset 8dc000) (???) (BuildId: 1aa2deb8f08484ea6acdcf2ad38b1af4bd91a372)
native: #7 pc 044f9d0c /product/app/TrichromeLibrary64/TrichromeLibrary64.apk (offset 8dc000) (???) (BuildId: 1aa2deb8f08484ea6acdcf2ad38b1af4bd91a372)
native: #8 pc 044f9ee0 /product/app/TrichromeLibrary64/TrichromeLibrary64.apk (offset 8dc000) (???) (BuildId: 1aa2deb8f08484ea6acdcf2ad38b1af4bd91a372)
native: #9 pc 00000860 [vdso] (???)
native: #10 pc 00075664 /apex/com.android.runtime/lib64/bionic/libc.so (abort+156) (BuildId: 1ec1d41f7c9e3e45043ebfef05c0ed3d)
native: #11 pc 01b6a420 /data/app/~~PHe8SJ_o7Oc7l_1UdkrJjg==/com.android-_PQCrKqe0nmsgCCWgtPuSg==/lib/arm64/libppocr_ncnn_single_lang.so (__kmp_abort_process+52) (BuildId: 74434215c6c9e54f851a580dfac1862dea618b2e)
native: #12 pc 01b6875c /data/app/~~PHe8SJ_o7Oc7l_1UdkrJjg==/com.android-_PQCrKqe0nmsgCCWgtPuSg==/lib/arm64/libppocr_ncnn_single_lang.so (__kmp_fatal+128) (BuildId: 74434215c6c9e54f851a580dfac1862dea618b2e)
native: #13 pc 01b66594 /data/app/~~PHe8SJ_o7Oc7l_1UdkrJjg==/com.android-_PQCrKqe0nmsgCCWgtPuSg==/lib/arm64/libppocr_ncnn_single_lang.so (__kmp_debug_assert+140) (BuildId: 74434215c6c9e54f851a580dfac1862dea618b2e)
native: #14 pc 01bb886c /data/app/~~PHe8SJ_o7Oc7l_1UdkrJjg==/com.android-_PQCrKqe0nmsgCCWgtPuSg==/lib/arm64/libppocr_ncnn_single_lang.so (???) (BuildId: 74434215c6c9e54f851a580dfac1862dea618b2e)
native: #15 pc 01bb6030 /data/app/~~PHe8SJ_o7Oc7l_1UdkrJjg==/com.android-_PQCrKqe0nmsgCCWgtPuSg==/lib/arm64/libppocr_ncnn_single_lang.so (???) (BuildId: 74434215c6c9e54f851a580dfac1862dea618b2e)
native: #16 pc 01bb359c /data/app/~~PHe8SJ_o7Oc7l_1UdkrJjg==/com.android-_PQCrKqe0nmsgCCWgtPuSg==/lib/arm64/libppocr_ncnn_single_lang.so (__kmp_affinity_initialize+60) (BuildId: 74434215c6c9e54f851a580dfac1862dea618b2e)
native: #17 pc 01b71acc /data/app/~~PHe8SJ_o7Oc7l_1UdkrJjg==/com.android-_PQCrKqe0nmsgCCWgtPuSg==/lib/arm64/libppocr_ncnn_single_lang.so (???) (BuildId: 74434215c6c9e54f851a580dfac1862dea618b2e)
native: #18 pc 01b6a8c4 /data/app/~~PHe8SJ_o7Oc7l_1UdkrJjg==/com.android-_PQCrKqe0nmsgCCWgtPuSg==/lib/arm64/libppocr_ncnn_single_lang.so (__kmp_parallel_initialize+276) (BuildId: 74434215c6c9e54f851a580dfac1862dea618b2e)
native: #19 pc 01b6c07c /data/app/~~PHe8SJ_o7Oc7l_1UdkrJjg==/com.android-_PQCrKqe0nmsgCCWgtPuSg==/lib/arm64/libppocr_ncnn_single_lang.so (__kmp_fork_call+160) (BuildId: 74434215c6c9e54f851a580dfac1862dea618b2e)
native: #20 pc 01b5d860 /data/app/~~PHe8SJ_o7Oc7l_1UdkrJjg==/com.android-_PQCrKqe0nmsgCCWgtPuSg==/lib/arm64/libppocr_ncnn_single_lang.so (__kmpc_fork_call+240) (BuildId: 74434215c6c9e54f851a580dfac1862dea618b2e)
native: #21 pc 015f27bc /data/app/~~PHe8SJ_o7Oc7l_1UdkrJjg==/com.android-_PQCrKqe0nmsgCCWgtPuSg==/lib/arm64/libppocr_ncnn_single_lang.so (???) (BuildId: 74434215c6c9e54f851a580dfac1862dea618b2e)
native: #22 pc 015f2610 /data/app/~~PHe8SJ_o7Oc7l_1UdkrJjg==/com.android-_PQCrKqe0nmsgCCWgtPuSg==/lib/arm64/libppocr_ncnn_single_lang.so (???) (BuildId: 74434215c6c9e54f851a580dfac1862dea618b2e)
native: #23 pc 015c7450 /data/app/~~PHe8SJ_o7Oc7l_1UdkrJjg==/com.android-_PQCrKqe0nmsgCCWgtPuSg==/lib/arm64/libppocr_ncnn_single_lang.so (PPOCRv5::init+36) (BuildId: 74434215c6c9e54f851a580dfac1862dea618b2e)
native: #24 pc 015c3f64 /data/app/~~PHe8SJ_o7Oc7l_1UdkrJjg==/com.android-_PQCrKqe0nmsgCCWgtPuSg==/lib/arm64/libppocr_ncnn_single_lang.so (Java_com_srcg_ai_ocr_PPOCRNcnn_init+64) (BuildId: 74434215c6c9e54f851a580dfac1862dea618b2e)

context | 编译/运行环境 | バックグラウンド

Android 运行环境 Android17
ncnn版本为 20260526
sha256:85b18b875488585c2d21360430e0e54abb6c04aa88094b471c20208ab55ff796

how to reproduce | 复现步骤 | 再現方法

1. 初始化时概率出现

more | 其他 | その他

[dosubot]

这个问题与 #6775 和你之前提的 #6856 是同一个根因，崩溃调用栈完全一致：__kmp_wait_4_ptr → __kmp_acquire_ticket_lock → __kmp_affinity_initialize → __kmp_parallel_initialize → __kmp_fork_call → __kmpc_fork_call [1] [2]。

区别在于你这次的表现是阻塞（blocking）而非崩溃（crash）——线程卡在 __kmp_wait_4_ptr 的 sched_yield 自旋等待上，导致 CPU 空转和耗电增加，而不是触发 __kmp_debug_assert 后 abort。这属于同一个 OpenMP (KMP) 在 Android 上进行线程亲和性初始化时的竞争问题的不同症状。

在 #6775 中，维护者 @nihui 提到了两个相关修复 commit（c934c6e 和 81c7df7），但多位用户反馈 20260526 版本仍然存在此问题 [2]。建议继续关注 #6775 的后续进展。

To reply, just mention @dosu.

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