Mono目录哈希表查找中的Mono 100%CPU旋转

我有一个应用程序是离线批处理任务处理器。基本上是一个任务运行程序，它接受stdin上的输入，执行给定的命令任务，通过NHibernate存储MySQL数据库的输出。它并不复杂，并且运行单线程（想想ApachePrefork模型）

在部署到更现代版本的mono时，我一直在使用100%的cpu内核挂起进程。该应用程序通常部署在Linux上，但我已经能够在Mono 5.8.1和5.12.0.233上的Visual Studio Community for Mac debugger中复制它。在VisualStudioCommunity下，当我破坏应用程序时，我不会得到任何关于正在执行的语句的信息

在Linux上访问gdb时，我确实得到了以下回溯：

回溯：

#0 0x00000000006fdff0在mono_conc_hashtable_查找中（hash_table=0xf174e0，键=key@entry=0x963d4f0）在mono-conc哈希表中。c:175 #1 0x000000000042fd29在mono_jit_运行时_调用（method=“System.Object:lambda_method（）”，obj=0x0，params=0x7fffb1067c10，exc=0x0， 迷你运行时错误=0x7fffb1067d00）。c:2668 #2 0x0000000000605a8f在do_运行时_调用中（method=“System.Object:lambda_method（）”，obj=，params=， 对象处的exc=，错误=0x7fffb1067d00）。c:2922 #3 0x0000000000611911在mono\u运行时\u尝试\u调用\u数组中（方法=method@entry=“System.Object:lambda_方法（）”，obj=obj@entry=0x0， params=params@entry=0x7fdb5d61fe68，exc=exc@entry=0x0，错误=error@entry=0x7fffb1067d00）位于对象c:5261处 #4 0x000000000061BD0在单声道运行时调用数组中已选中（方法=method@entry=“System.Object:lambda_方法（）”，obj=obj@entry=0x0， params=params@entry=0x7fdb5d61fe68，错误=error@entry=0x7fffb1067d00）位于对象c:5139处 #在icall.c:3392上的ves_icall_InternalInvoke中的5 0x00000000005c17fb（方法=0x7fdb5d61fe40，此参数=0x0，参数=0x7fdb5d61fe68，exc=0x7fffb1067e70） #6 0x0000000040c4081a英寸？？() #7 0x00007fdb5d5ab2a0英寸？？() #8 0x00007FDB51E688英寸？？() #9 0x00007FDB51E828英寸？？() #10 0x0000000000000000英寸？？() 单声道回溯

#0 0x00000000006fdff0在mono_conc_hashtable_查找中（hash_table=0xf174e0，键=key@entry=0x963d4f0）在mono-conc哈希表中。c:175 175 if（key==kvs[i].key）{ [新螺纹0x7fdaf9b1d700（LWP 11880）] #1 0x000000000042fd29在mono_jit_运行时_调用（method=“System.Object:lambda_method（）”，obj=0x0，params=0x7fffb1067c10，exc=0x0， 迷你运行时错误=0x7fffb1067d00）。c:2668 2668信息=（RuntimeInvokeInfo*）mono_conc_hashtable_lookup（域信息->运行时调用_hash，方法）； [新螺纹0x7fdb50baa700（LWP 11881）] #2 0x0000000000605a8f在do_运行时_调用中（method=“System.Object:lambda_method（）”，obj=，params=， 对象处的exc=，错误=0x7fffb1067d00）。c:2922 2922 result=callbacks.runtime_invoke（方法、对象、参数、exc、错误）； #3 0x0000000000611911在mono\u运行时\u尝试\u调用\u数组中（方法=method@entry=“System.Object:lambda_方法（）”，obj=obj@entry=0x0， params=params@entry=0x7fdb5d61fe68，exc=exc@entry=0x0，错误=error@entry=0x7fffb1067d00）位于对象c:5261处 5261 res=mono\u runtime\u invoke\u checked（方法、obj、pa、错误）； #4 0x000000000061BD0在单声道运行时调用数组中已选中（方法=method@entry=“System.Object:lambda_方法（）”，obj=obj@entry=0x0， params=params@entry=0x7fdb5d61fe68，错误=error@entry=0x7fffb1067d00）位于对象c:5139处 5139返回mono_runtime_try_invoke_数组（方法、对象、参数、NULL、错误）； [新螺纹0x7fdaf8d27700（LWP 11882）] #在icall.c:3392上的ves_icall_InternalInvoke中的5 0x00000000005c17fb（方法=0x7fdb5d61fe40，此参数=0x0，参数=0x7fdb5d61fe68，exc=0x7fffb1067e70） 3392 MonoObject*result=mono_运行时_调用_数组_已检查（m、obj、参数、错误）； #6 0x40c4081a in（包装器管理为本机）System.Reflection.MonMethod:InternalInvoke（System.Reflection.MonMethod，对象，对象[]，System.Exception&）{0x12a4498}+0x6a（0x40c407b0 0x40c4088c）[0xf125d0-MOAB.Task.TaskRunner.exe] [新螺纹0x7fdb509a9700（LWP 11884）] #7 0x00007fdb5d5ab2a0英寸（） #8 0x00007FDB51E688英寸（） #9 0x00007FDB51E828英寸（） #10 0x0000000000000000英寸（） 发生这种情况时，大多数线程都处于休眠状态：

Id Target Id Frame 15 Thread 0x7fdb5d3ff700 (LWP 11515) "SGen worker" pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185 14 Thread 0x7fdb5aee5700 (LWP 11516) "Finalizer" 0x00007fdb6458da0b in futex_abstimed_wait (cancel=true, private=, abstime=0x0, expected=0, futex=0xa45c00 ) at ../nptl/sysdeps/unix/sysv/linux/sem_waitcommon.c:43 13 Thread 0x7fdb515df700 (LWP 11519) "Timer-Scheduler" pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238 12 Thread 0x7fdb50dab700 (LWP 11520) "Thread Pool I/O" 0x00007fdb64094a3d in poll () at ../sysdeps/unix/syscall-template.S:81 11 Thread 0x7fdaf991c700 (LWP 11572) "Datastore Capac" pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238 10 Thread 0x7fdaebfff700 (LWP 11822) "Thread Pool Wor" 0x00007fdb6458dc21 in futex_abstimed_wait (cancel=true, private=0, abstime=0x7fdaebffeda0, expected=0, futex=0xa465c8 ) at ../nptl/sysdeps/unix/sysv/linux/sem_waitcommon.c:87 9 Thread 0x7fdaeaed3700 (LWP 11879) "Thread Pool Wor" 0x00007fdb6458dc21 in futex_abstimed_wait (cancel=true, private=0, abstime=0x7fdaeaed2da0, expected=0, futex=0xa465c8 ) at ../nptl/sysdeps/unix/sysv/linux/sem_waitcommon.c:87 8 Thread 0x7fdb509a9700 (LWP 11884) "Thread Pool Wor" 0x00007fdb6458dc21 in futex_abstimed_wait (cancel=true, private=0, abstime=0x7fdb509a8da0, expected=0, futex=0xa465c8 ) at ../nptl/sysdeps/unix/sysv/linux/sem_waitcommon.c:87 7 Thread 0x7fdaf9d1e700 (LWP 11944) "Thread Pool Wor" 0x00007fdb6458dc21 in futex_abstimed_wait (cancel=true, private=0, abstime=0x7fdaf9d1dda0, expected=0, futex=0xa465c8 ) at ../nptl/sysdeps/unix/sysv/linux/sem_waitcommon.c:87 6 Thread 0x7fdaeacd2700 (LWP 11993) "Thread Pool Wor" 0x00007fdb6458dc21 in futex_abstimed_wait (cancel=true, private=0, abstime=0x7fdaeacd1da0, expected=0, futex=0xa465c8 ) at ../nptl/sysdeps/unix/sysv/linux/sem_waitcommon.c:87 5 Thread 0x7fdaf9b1d700 (LWP 12002) "Thread Pool Wor" 0x00007fdb6458dc21 in futex_abstimed_wait (cancel=true, private=0, abstime=0x7fdaf9b1cda0, expected=0, futex=0xa465c8 ) at ../nptl/sysdeps/unix/sysv/linux/sem_waitcommon.c:87 4 Thread 0x7fdaf8d27700 (LWP 12201) "Thread Pool Wor" 0x00007fdb6458dc21 in futex_abstimed_wait (cancel=true, private=0, abstime=0x7fdaf8d26da0, expected=0, futex=0xa465c8 ) at ../nptl/sysdeps/unix/sysv/linux/sem_waitcommon.c:87 3 Thread 0x7fdb507a8700 (LWP 12631) "Thread Pool Wor" 0x00007fdb6458dc21 in futex_abstimed_wait (cancel=true, private=0, abstime=0x7fdb507a7da0, expected=0, futex=0xa465c8 ) at ../nptl/sysdeps/unix/sysv/linux/sem_waitcommon.c:87 2 Thread 0x7fdae8899700 (LWP 12632) "Thread Pool Wor" 0x00007fdb6458dc21 in futex_abstimed_wait (cancel=true, private=0, abstime=0x7fdae8898da0, expected=0, futex=0xa465c8 ) at ../nptl/sysdeps/unix/sysv/linux/sem_waitcommon.c:87 * 1 Thread 0x7fdb650b3780 (LWP 11511) "TaskRunner" 0x00000000006fdff0 in mono_conc_hashtable_lookup (hash_table=0xf174e0, key=key@entry=0x963d4f0) at mono-conc-hashtable.c:175 Id目标Id帧 15线程0x7fdb5d3ff700（LWP 11515）“SGen工作线程”pthread_cond_wait@@GLIBC_2.3.2（） 位于../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185 14线程0x7fdb5aee5700（LWP 11516）“终结器”0x00007fdb6458da0b在futex_Abstided_等待中（取消=真，私有=，abstime=0x0， expected=0，futex=0xa45c00）位于../nptl/sysdeps/unix/sysv/linux/sem_waitcommon.c:43 13线程0x7fdb515df700（LWP 11519）“计时器调度程序”pthread_cond_timedwait@@GLIBC_2.3.2（） 位于../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238 轮询中的12个线程0x7fdb50dab700（LWP 11520）“线程池I/O”0x00007fdb64094a3d位于../sysdeps/unix/syscall template.S:81 11线程0x7fdaf991c700（LWP 11572）“数据存储Capac”pthread_cond_timedwait@@GLIBC_2.3.2（） 位于../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238 10线程0x7fdaebfff700（LWP 11822）“线程池工作”0x00007fdb6458dc21在futex_Abstided_等待中（取消=真，私有=0，abstime=0x7fdaebffeda0， expected=0，futex=0xa465c8）位于../nptl/sysdeps/unix/sysv/linux/sem_waitcommon.c:87 9线程0x7fdaeaed3700（LWP 11879）“线程池工作”0x00007fdb6458dc21在futex_Abstided_等待中（取消=真，私有=0，abstime=0x7FDAEAEAED2DA0， expected=0，futex=0xa465c8）位于../nptl/sysdeps/unix/sysv/linux/sem_waitcommon.c:87 8线程0x7fdb509a9700（LWP 11884）“线程池工作”0x00007fdb6458dc21在futex_Abstided_wait中（取消=真，私有=0，abstime=0x7fdb509a8da0， 应为0，futex=0xa465c8），在../npt处 #0 0x00000000006fdff0 in mono_conc_hashtable_lookup (hash_table=0xf174e0, key=key@entry=0x963d4f0) at mono-conc-hashtable.c:175 175 if (key == kvs [i].key) { [New Thread 0x7fdaf9b1d700 (LWP 11880)] #1 0x000000000042fd29 in mono_jit_runtime_invoke (method="System.Object:lambda_method ()", obj=0x0, params=0x7fffb1067c10, exc=0x0, error=0x7fffb1067d00) at mini-runtime.c:2668 2668 info = (RuntimeInvokeInfo *)mono_conc_hashtable_lookup (domain_info->runtime_invoke_hash, method); [New Thread 0x7fdb50baa700 (LWP 11881)] #2 0x0000000000605a8f in do_runtime_invoke (method="System.Object:lambda_method ()", obj=, params=, exc=, error=0x7fffb1067d00) at object.c:2922 2922 result = callbacks.runtime_invoke (method, obj, params, exc, error); #3 0x0000000000611911 in mono_runtime_try_invoke_array (method=method@entry="System.Object:lambda_method ()", obj=obj@entry=0x0, params=params@entry=0x7fdb5d61fe68, exc=exc@entry=0x0, error=error@entry=0x7fffb1067d00) at object.c:5261 5261 res = mono_runtime_invoke_checked (method, obj, pa, error); #4 0x0000000000611bd0 in mono_runtime_invoke_array_checked (method=method@entry="System.Object:lambda_method ()", obj=obj@entry=0x0, params=params@entry=0x7fdb5d61fe68, error=error@entry=0x7fffb1067d00) at object.c:5139 5139 return mono_runtime_try_invoke_array (method, obj, params, NULL, error); [New Thread 0x7fdaf8d27700 (LWP 11882)] #5 0x00000000005c17fb in ves_icall_InternalInvoke (method=0x7fdb5d61fe40, this_arg=0x0, params=0x7fdb5d61fe68, exc=0x7fffb1067e70) at icall.c:3392 3392 MonoObject *result = mono_runtime_invoke_array_checked (m, obj, params, error); #6 0x40c4081a in (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (System.Reflection.MonoMethod,object,object[],System.Exception&) {0x12a4498} + 0x6a (0x40c407b0 0x40c4088c) [0xf125d0 - MOAB.Task.TaskRunner.exe] [New Thread 0x7fdb509a9700 (LWP 11884)] #7 0x00007fdb5d5ab2a0 in ?? () #8 0x00007fdb5d61e688 in ?? () #9 0x00007fdb5d61e828 in ?? () #10 0x0000000000000000 in ?? () Id Target Id Frame 15 Thread 0x7fdb5d3ff700 (LWP 11515) "SGen worker" pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185 14 Thread 0x7fdb5aee5700 (LWP 11516) "Finalizer" 0x00007fdb6458da0b in futex_abstimed_wait (cancel=true, private=, abstime=0x0, expected=0, futex=0xa45c00 ) at ../nptl/sysdeps/unix/sysv/linux/sem_waitcommon.c:43 13 Thread 0x7fdb515df700 (LWP 11519) "Timer-Scheduler" pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238 12 Thread 0x7fdb50dab700 (LWP 11520) "Thread Pool I/O" 0x00007fdb64094a3d in poll () at ../sysdeps/unix/syscall-template.S:81 11 Thread 0x7fdaf991c700 (LWP 11572) "Datastore Capac" pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238 10 Thread 0x7fdaebfff700 (LWP 11822) "Thread Pool Wor" 0x00007fdb6458dc21 in futex_abstimed_wait (cancel=true, private=0, abstime=0x7fdaebffeda0, expected=0, futex=0xa465c8 ) at ../nptl/sysdeps/unix/sysv/linux/sem_waitcommon.c:87 9 Thread 0x7fdaeaed3700 (LWP 11879) "Thread Pool Wor" 0x00007fdb6458dc21 in futex_abstimed_wait (cancel=true, private=0, abstime=0x7fdaeaed2da0, expected=0, futex=0xa465c8 ) at ../nptl/sysdeps/unix/sysv/linux/sem_waitcommon.c:87 8 Thread 0x7fdb509a9700 (LWP 11884) "Thread Pool Wor" 0x00007fdb6458dc21 in futex_abstimed_wait (cancel=true, private=0, abstime=0x7fdb509a8da0, expected=0, futex=0xa465c8 ) at ../nptl/sysdeps/unix/sysv/linux/sem_waitcommon.c:87 7 Thread 0x7fdaf9d1e700 (LWP 11944) "Thread Pool Wor" 0x00007fdb6458dc21 in futex_abstimed_wait (cancel=true, private=0, abstime=0x7fdaf9d1dda0, expected=0, futex=0xa465c8 ) at ../nptl/sysdeps/unix/sysv/linux/sem_waitcommon.c:87 6 Thread 0x7fdaeacd2700 (LWP 11993) "Thread Pool Wor" 0x00007fdb6458dc21 in futex_abstimed_wait (cancel=true, private=0, abstime=0x7fdaeacd1da0, expected=0, futex=0xa465c8 ) at ../nptl/sysdeps/unix/sysv/linux/sem_waitcommon.c:87 5 Thread 0x7fdaf9b1d700 (LWP 12002) "Thread Pool Wor" 0x00007fdb6458dc21 in futex_abstimed_wait (cancel=true, private=0, abstime=0x7fdaf9b1cda0, expected=0, futex=0xa465c8 ) at ../nptl/sysdeps/unix/sysv/linux/sem_waitcommon.c:87 4 Thread 0x7fdaf8d27700 (LWP 12201) "Thread Pool Wor" 0x00007fdb6458dc21 in futex_abstimed_wait (cancel=true, private=0, abstime=0x7fdaf8d26da0, expected=0, futex=0xa465c8 ) at ../nptl/sysdeps/unix/sysv/linux/sem_waitcommon.c:87 3 Thread 0x7fdb507a8700 (LWP 12631) "Thread Pool Wor" 0x00007fdb6458dc21 in futex_abstimed_wait (cancel=true, private=0, abstime=0x7fdb507a7da0, expected=0, futex=0xa465c8 ) at ../nptl/sysdeps/unix/sysv/linux/sem_waitcommon.c:87 2 Thread 0x7fdae8899700 (LWP 12632) "Thread Pool Wor" 0x00007fdb6458dc21 in futex_abstimed_wait (cancel=true, private=0, abstime=0x7fdae8898da0, expected=0, futex=0xa465c8 ) at ../nptl/sysdeps/unix/sysv/linux/sem_waitcommon.c:87 * 1 Thread 0x7fdb650b3780 (LWP 11511) "TaskRunner" 0x00000000006fdff0 in mono_conc_hashtable_lookup (hash_table=0xf174e0, key=key@entry=0x963d4f0) at mono-conc-hashtable.c:175 158 mono_conc_hashtable_lookup (MonoConcurrentHashTable *hash_table, gpointer key) 159 { 160 MonoThreadHazardPointers* hp; 161 conc_table *table; 162 int hash, i, table_mask; 163 key_value_pair *kvs; 164 hash = mix_hash (hash_table->hash_func (key)); 165 hp = mono_hazard_pointer_get (); 166 167 retry: 168 table = (conc_table *)mono_get_hazardous_pointer ((gpointer volatile*)&hash_table->table, hp, 0); 169 table_mask = table->table_size - 1; 170 kvs = table->kvs; 171 i = hash & table_mask; 172 173 if (G_LIKELY (!hash_table->equal_func)) { 174 while (kvs [i].key) { 175 if (key == kvs [i].key) { 176 gpointer value; 177 /* The read of keys must happen before the read of values */ 178 mono_memory_barrier (); 179 value = kvs [i].value; 180 /* FIXME check for NULL if we add suppport for removal */ 181 mono_hazard_pointer_clear (hp, 0); 182 return value; 183 } 184 i = (i + 1) & table_mask; 185 } 186 } else { 187 GEqualFunc equal = hash_table->equal_func; 188 189 while (kvs [i].key) { 190 if (kvs [i].key != TOMBSTONE && equal (key, kvs [i].key)) { 191 gpointer value; 192 /* The read of keys must happen before the read of values */ 193 mono_memory_barrier (); 194 value = kvs [i].value; 195 196 /* We just read a value been deleted, try again. */ 197 if (G_UNLIKELY (!value)) 198 goto retry; 199 200 mono_hazard_pointer_clear (hp, 0); 201 return value; 202 } 203 i = (i + 1) & table_mask; 204 } 205 } 206 207 /* The table might have expanded and the value is now on the newer table */ 208 mono_memory_barrier (); 209 if (hash_table->table != table) 210 goto retry; 211 212 mono_hazard_pointer_clear (hp, 0); 213 return NULL; 214 } (gdb) break 182 thread 1 Breakpoint 4 at 0x6fdff5: file mono-conc-hashtable.c, line 182. (gdb) break 201 thread 1 Breakpoint 5 at 0x6fe0e0: file mono-conc-hashtable.c, line 201. (gdb) break 213 thread 1 Breakpoint 6 at 0x6fe024: file mono-conc-hashtable.c, line 213. (gdb) break 198 thread 1 Breakpoint 5 at 0x6fe0d5: file mono-conc-hashtable.c, line 198. (gdb) break 210 thread 1 Breakpoint 6 at 0x6fe019: file mono-conc-hashtable.c, line 210. Breakpoint 12, mono_conc_hashtable_lookup (hash_table=0xf174e0, key=key@entry=0x963d4f0) at mono-conc-hashtable.c:184 184 i = (i + 1) & table_mask; (gdb) p i $15 = 4095 (gdb) p table_mask $16 = 4095 (gdb) s 174 while (kvs [i].key) { (gdb) p i $17 = 0