JDK-8217362 : Emergency dump does not work when disk=false is set
- Type: Bug
- Component: hotspot
- Sub-Component: jfr
- Affected Version: 11,12,13
- Priority: P4
- Status: Resolved
- Resolution: Fixed
- Submitted: 2019-01-18
- Updated: 2021-05-04
- Resolved: 2019-03-25
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| JDK 11 | JDK 13 | Other |
|---|---|---|
| 11.0.12-oracleFixed | 13 b14Fixed  |
openjdk8u282Fixed |
Related Reports
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Relates :
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Description
Emergency dump does not work when disk=false is set to -XX:StartFlightRecodging.
I investigated this with strace on Linux x64. HotSpot attempted to open emergency flight record file, but open syscall returned ENOENT as below:
-------------
[pid 4929] openat(AT_FDCWD, "/home/ysuenaga/github/garakuta/NativeSEGV/hs_err_pid4928.jfr", O_RDWR|O_CLOEXEC) = -1 ENOENT (No such file or directory)
-------------
We need to pass `O_CREAT | O_WRONLY` to `os::open()`.
(disk=true (default) works fine)
How to reproduce:
1. Build testcase
https://github.com/YaSuenag/garakuta/tree/master/NativeSEGV
$ export JAVA_HOME=<path>
$ make
2. Run testcase
$ $JAVA_HOME/bin/java -XX:StartFlightRecording=disk=false -Djava.library.path=. NativeSEGV
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