JVM crashes with error='Cannot allocate memory' (errno=12)
My code crashes with this error message
Executing "/usr/bin/java com.utils.BotFilter" OpenJDK 64-Bit Server VM warning: INFO: os::commit_memory(0x0000000357c80000, 2712666112, 0) failed; error='Cannot allocate memory' (errno=12)
There is insufficient memory for the Java Runtime Environment to continue. Native memory allocation (malloc) failed to allocate 2712666112 bytes for committing reserved memory. An error report file with more information is saved as: /tmp/jvm-29955/hs_error.log`
Here is the content of the generated
This line from crash log seems interesting to me:
Memory: 4k page, physical 98823196k(691424k free), swap 1048572k(0k free)
Does it mean that the machine has memory but is running out of swap space?
Here is meminfo from the crash log but I don't really know how to interpret it, like what is the difference between MemFree and MemAvailable? How much memory is this process taking?
MemTotal: 98823196 kB MemFree: 691424 kB MemAvailable: 2204348 kB Buffers: 145568 kB Cached: 2799624 kB SwapCached: 304368 kB Active: 81524540 kB Inactive: 14120408 kB Active(anon): 80936988 kB Inactive(anon): 13139448 kB Active(file): 587552 kB Inactive(file): 980960 kB Unevictable: 0 kB Mlocked: 0 kB SwapTotal: 1048572 kB SwapFree: 0 kB Dirty: 1332 kB Writeback: 0 kB AnonPages: 92395828 kB Mapped: 120980 kB Shmem: 1376052 kB Slab: 594476 kB SReclaimable: 282296 kB SUnreclaim: 312180 kB KernelStack: 317648 kB PageTables: 238412 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 50460168 kB Committed_AS: 114163748 kB VmallocTotal: 34359738367 kB VmallocUsed: 314408 kB VmallocChunk: 34308158464 kB HardwareCorrupted: 0 kB AnonHugePages: 50071552 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB DirectMap4k: 116924 kB DirectMap2M: 5115904 kB DirectMap1G: 95420416 kB
Crashing JVM, This line in the hs_err_pid file explains the operation that crashed: I've witnessed recurring JVM crashes were both due to hardware failure,� A JVM crash is caused by a programming error in the JRockit JVM. Identifying and troubleshooting a JVM crash can help you find a temporary workaround until the problem is solved in the JRockit JVM. It may also help Oracle Support to identify and fix the problem faster. Code Generation Crash.
As Scary Wombat mentions, the JVM is trying to allocate 2712666112 bytes (2.7 Gb) of memory, and you only have 691424000 bytes (0.69 Gb) of free physical memory and nothing available on the swap.
How do I investigate the cause of a JVM crash?, Segmentation fault. A In this case the log will start with the message “A fatal error has been detected by the Java Runtime Environment”. In this� The crash is in the JVM, not in external native code. However, the operation it crashed on has been initiated by and external DLL. This line in the hs_err_pid file explains the operation that crashed: VM_Operation (0x00007f5e16e35450): GetAllStackTraces, mode: safepoint, requested by thread 0x0000000040796000 Now, thread 0x0000000040796000 is
Another possibility (which I encountered just now) would be bad settings for "overcommit memory" on linux.
In my situation,
/proc/sys/vm/overcommit_memory was set to "2" and
/proc/sys/vm/overcommit_ratio to "50" , meaning "don't ever overcommit and only allow allocation of 50% of the available RAM+Swap".
That's a pretty deceptive problem, since there can be a lot of memory available, but allocations still fail for apparently no reason.
The settings can be changed to the default (overcommit in a sensible way) for now (until a restart):
echo 0 >/proc/sys/vm/overcommit_memory
... or permanently:
echo "vm.overcommit_memory=0 >> /etc/sysctl.conf sysctl -p /etc/sysctl.conf # apply it immediately
Note: this can also partly be diagnosed by looking at the output of
... CommitLimit: 45329388 kB Committed_AS: 44818080 kB ...
In the example in the question,
Committed_AS is much higher than
CommitLimit, indicating (together with the fact that allocations fail) that overcommit is enabled, while here both values are close together, meaning that the limit is strictly enforced.
An excellent detailed explanation of these settings and their effect (as well as when it makes sense to modify them) can be found in this pivotal blog entry. (Tl;dr: messing with overcommit is useful if you don't want critical processes to use swap)
Staying on top of the JVM crashes, So this line in the log indicated a segmentation fault killed the JVM process. In other words, the JVM was attempting to access data that did not� A CRASH IN JVM NATIVE CODE WAS DETECTED. DON"T WORRY! This sometimes happens with Java. This error was not caused by your mod or your code. You can fix this by running the task once again. Error details (produced by Java): A fatal error has been detected by the Java Runtime Environment.
How We Diagnosed a JVM Crash, Well, it might be the case that you don't make mistakes, or you don't the JVM to create a memory dump when the the OutOfMemory error� A Crash or even a fatal error can cause a Crash. A bug in the API, a bug in third party library that we use or bug in a native api can cause these JVM crashes. JVM can crash due to the external factors like resource exhaustion etc. In this article we will see how we can analyze a JVM crash.
When JVMs Crash: How to Investigate the Root Cause of Your , One of the most frequent reasons for the Java Virtual Machine launcher problems is insufficient memory in your COMPUTER. This insufficiency may be in your overall computer memory or in the amount of memory you allocate to Java Runtime.
A crash, or fatal error, causes a process to terminate abnormally. There are various possible reasons for a crash. For example, a crash can occur due to a bug in the HotSpot VM, in a system library, in a Java SE library or API, in application native code, or even in the operating system.
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