JDK-6420129 : Hotspot crashes with a segv in os::is_first_C_frame()
  • Type: Bug
  • Component: hotspot
  • Sub-Component: runtime
  • Affected Version: 5.0u8
  • Priority: P3
  • Status: Closed
  • Resolution: Won't Fix
  • OS: generic
  • CPU: generic
  • Submitted: 2006-05-01
  • Updated: 2010-05-11
  • Resolved: 2006-05-01
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JDK 6
6Fixed
Related Reports
Relates :  
JDK-6340753 - ParallelGC: SIGBUS (0xa) at pc=0xffffffff3010be18 detected by HotSpot VM
Description
Hotspot can crash during error reporting while trying to determine if the top (youngest)
stack frame is a Java or native frame.  If the top frame is indeed a native frame and
the frame pointer is not available or contains trash, os::is_first_C_frame can segv
while attempting to dereference it.

This problem was encountered during attempts to reproduce 6340753.
Comments
SUGGESTED FIX Check for misaligned sp/fp in src/share/vm/runtime.os.cpp (new vs old) 591,597d590 < // Load up sp, fp, sender sp and sender fp, check for reasonable values. < // Check usp first, because if that's bad the other accessors may fault < // on some architectures. Ditto ufp second, etc. < < uintptr_t usp = (uintptr_t)fr->sp(); < if ((usp & (sizeof(address) - 1)) != 0) return true; < 599,600c592 < if ((ufp & (sizeof(address) - 1)) != 0) return true; < --- > uintptr_t usp = (uintptr_t)fr->sp(); 602,603d593 < if ((old_sp & (sizeof(address) - 1)) != 0) return true; < 605d594 < if ((old_fp & (sizeof(address) - 1)) != 0) return true; 617a607,610 > // see if old_fp and old_sp are correctly aligned > if ((old_fp & (sizeof(address) - 1)) != 0) return true; > if ((old_sp & (sizeof(address) - 1)) != 0) return true;
01-05-2006
EVALUATION Using a 5.0_08 version of Hotspot with a revised is_first_C_frame (see suggested fix), I ran specjbb2005 in an infinite loop for 6 days on burl-6800-2-a.east (a 24-way 750mhz serengeti) up 48 warehouses using these switches -d64 -Xbatch -Xms8G -Xmx8G -Xss256K -XX:+UseParallelGC -XX:ParallelGCThreads=8 -XX:+PrintGCTimeStamps -XX:+PrintGCDetails -XX:+PrintCommandLineFlags -verbose:gc -XX:+ShowMessageBoxOnError If there's still an underlying SIGBUS problem, it appears to have either been fixed since 5.0_06, or to be NR.
01-05-2006