JDK-6314875 : Linux NPTL/Futex pthread_cond_timedwait() bug can corrupt condvar & hang - impacts JVM object.wait()
- Type: Bug
- Component: hotspot
- Sub-Component: runtime
- Affected Version: 6,7
- Priority: P2
- Status: Closed
- Resolution: Fixed
- OS: linux
- CPU: generic,x86
- Submitted: 2005-08-23
- Updated: 2015-07-08
- Resolved: 2005-10-03
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| JDK 6 |
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6 b54Fixed  |
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Description
Some versions of NPTL embody a flaw where pthread_cond_timedwait() can hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. For specifics regarding the bug see GLIBC BUGID 261237 : http://www.mail-archive.com/###@###.###/msg10837.html. Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar is used. (The simple C test-case provided in the GLIBC bug report manifests the hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() and monitorenter. All those operations may result in calls to pthread_cond_timedwait(). Workarounds: - Upgrade to a version of linux/nptl that does not have the bug - Use LD_ASSUME_KERNEL to select the older non-ntpl libpthread.so
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