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Posted to issues@brpc.apache.org by "zhaojinzhou (via GitHub)" <gi...@apache.org> on 2025/08/24 09:46:00 UTC
[I] flatmap operator= 导致死锁 (brpc)
zhaojinzhou opened a new issue, #3070:
URL: https://github.com/apache/brpc/issues/3070
**Describe the bug**
<img width="2878" height="488" alt="Image" src="https://github.com/user-attachments/assets/8e310e46-7972-44ef-9560-730597647c3f" />
**To Reproduce**
暂时无法复现。
运行时 偶发死锁，并且一直死循环在这个函数中。
很旧版本的brpc 无此问题。
**Expected behavior**
**Versions**
OS: ubuntu 20.04
Compiler: g++ 8.4
brpc: 1.13.0
protobuf: 3.6.9
**Additional context/screenshots**
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Re: [I] flatmap operator= 导致死锁 (brpc)
Posted by "zhaojinzhou (via GitHub)" <gi...@apache.org>.
zhaojinzhou closed issue #3070: flatmap operator= 导致死锁
URL: https://github.com/apache/brpc/issues/3070
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Re: [I] flatmap operator= 导致死锁 (brpc)
Posted by "zhaojinzhou (via GitHub)" <gi...@apache.org>.
zhaojinzhou closed issue #3070: flatmap operator= 导致死锁
URL: https://github.com/apache/brpc/issues/3070
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Re: [I] flatmap operator= 导致死锁 (brpc)
Posted by "zhaojinzhou (via GitHub)" <gi...@apache.org>.
zhaojinzhou commented on issue #3070:
URL: https://github.com/apache/brpc/issues/3070#issuecomment-3218073531
！！！ 实锤，以下代码 会死锁。 碰到赋值语句，立刻死锁。 希望尽早修复
#include <iostream>
#include <vector>
#include <atomic>
#include <memory>
#include <random>
inline uint64_t find_power2(uint64_t b) {
b -= 1;
b |= (b >> 1);
b |= (b >> 2);
b |= (b >> 4);
b |= (b >> 8);
b |= (b >> 16);
b |= (b >> 32);
return b + 1;
}
inline size_t flatmap_round(size_t nbucket) {
#ifdef FLAT_MAP_ROUND_BUCKET_BY_USE_NEXT_PRIME
return find_next_prime(nbucket);
#else
// the lowerbound fixes the corner case of nbucket=0 which results in coredump during seeking the map.
return nbucket <= 8 ? 8 : find_power2(nbucket);
#endif
}
static bool is_too_crowded(size_t size, size_t nbucket, uint32_t load_factor) {
return size * 100 >= nbucket * load_factor;
}
int main() {
size_t new_nbucket =16;
size_t size = 14;
do {
new_nbucket = flatmap_round(16);
static int i=0;
i++;
if (i % 1000 == 0) {
std::cout << "new_buckets_and_thumbnail: ";
}
} while (is_too_crowded(size, new_nbucket, 80));
}
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