deadlock

问题 I am seeing a deadlock with MySQL 5.6 because of what seems like trying to lock the same row/s twice. From the snippet below, rows where id = (11, 12, 13, 14, 15) already have a lock. And when another transaction tried to acquire a lock on these, MySQL failed the transaction detecting a deadlock. Is my reading of this correct? If so, is there anything in MySQL 5.6 to get over this? FWIW, the same code in 5.5 worked just fine (for several hundreds of iterations). ------------------------

问题 In our production environment, weblogic server hangs for half an hour, It looks like it has dead-locked threads. But after investigating thread dumps, 3 threads are blocked for the same lock, but no other threads own this lock.. Here is the stacktrace.. Do you have any reasonable explanation for this stiuation?. Here is the blocked threads; "pool-1013-thread-5" prio=7 tid=600000000842be00 nid=17280 lwp_id=518677 waiting for monitor entry [9fffffffe6aff000..9fffffffe6b00bd0] java.lang.Thread

问题 The event logs for my .NET application show that it occasionally deadlocks while reading from Sql Server. This is usually very rare as we have already optimized our queries to avoid deadlocks, but they sometimes still occur. In the past, we've had some deadlocks that occur while calling the ExecuteReader function on our SqlCommand instance. To fix this we've added retry code to simply run the query again, like this: //try to run the query five times if a deadlock happends int DeadLockRetry =

问题 I'm trying to debug a custom thread pool implementation that has rarely deadlocks. So I cannot use a debugger like gdb because I have click like 100 times "launch" debugger before having a deadlock. Currently, I'm running the threadpool test in an infinite loop in a shell script, but that means I cannot see variables and so on. I'm trying to std::cout data, but that slow down the thread and reduce the risk of deadlocks meaning that I can wait like 1hour with my infinite before getting

问题 I've been searching information on Peterson's algorithm but have come across references stating it does not satisfy starvation but only deadlock. Is this true? and if so can someone elaborate on why it does not? Peterson's algorithm: flag[0] = 0; flag[1] = 0; turn; P0: flag[0] = 1; turn = 1; while (flag[1] == 1 && turn == 1) { // busy wait } // critical section ... // end of critical section flag[0] = 0; P1: flag[1] = 1; turn = 0; while (flag[0] == 1 && turn == 0) { // busy wait } // critical

问题 I'am using the storm's multilang throughing PHP. But it seems have some problem. Then my spout is a php script which read contents from a file.And in the beginning of the 4Mb content,which runs correctly. But then php process will blocks in the write(1,xxxx...,when i strace -p the php spout. But the next bolt process is blocked in the read(0, i doubt this is the storm's problem,but the question is why each time the spout analyse is 4Mb, and is it a java processBuild's deadlock? How to avoid

问题 I met the following deadlock once and was very confusing about why the deadlock happened. TRANSACTION(1) is running sql: delete from `test_STEP` where `test_C1`=865 TRANSACTION(2) is running sql: delete from `test_STEP` where `test_C1`=866 Column test_C1 has unique index named test_STEP_IDX. And the PRIMARY index is for another column named E_ID. From the deadlock info, we could see that TRANSACTION(1) wasn't holding any lock but was waiting for a certain record lock in X mode on PRIMARY

问题 I am using NodeJS and mysql library to access MySQL database. When I establish single connection and repeatedly use it, it works fine: global.mysql = mysql_module.createConnection({ host: config.mysql.host, user: config.mysql.user, password: config.mysql.password }); When I use connection pool instead, I get ER_LOCK_WAIT_TIMEOUT errors in transactions. global.mysql = mysql_module.createPool({ host: config.mysql.host, user: config.mysql.user, password: config.mysql.password, database : config

问题 Ok, the title sounds confusing but the concept is not too bad. Basically, I have two processes that are running (let's call them process 0 and process 1). They both run a function at the same time. While this function is running, sometimes they need data from each other. So process 0 sometimes requests data from process 1 and vice versa. Since they rely on each other, I don't want one process to finish before the other. If process 0 finishes its work, it should continue checking for requests

问题 I have a program that spawns lots of children and runs for long periods of time. The program contains a SIGCHLD handler to reap defunct processes. Occasionally, this program freezes. I believe that pstack is indicating a deadlock scenario. Is that the proper interpretation of this output? 10533: ./asyncsignalhandler ff3954e4 lwp_park (0, 0, 0) ff391bbc slow_lock (ff341688, ff350000, 0, 0, 0, 0) + 58 ff2c45c8 localtime_r (ffbfe7a0, 0, 0, 0, 0, 0) + 24 ff2ba39c __posix_ctime_r (ffbfe7a0,