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8216428: Remove IgnoreLibthreadGPFault

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Reviewed-by: dholmes, eosterlund
This commit is contained in:
Claes Redestad 2019-01-10 16:50:26 +01:00
parent 79c3909afc
commit 055c620313
2 changed files with 0 additions and 51 deletions
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48
src/hotspot/os_cpu/solaris_x86/os_solaris_x86.cpp
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@ -686,54 +686,6 @@ JVM_handle_solaris_signal(int sig, siginfo_t* info, void* ucVoid,
return true;
}
#ifndef AMD64
// Workaround (bug 4900493) for Solaris kernel bug 4966651.
// Handle an undefined selector caused by an attempt to assign
// fs in libthread getipriptr(). With the current libthread design every 512
// thread creations the LDT for a private thread data structure is extended
// and thre is a hazard that and another thread attempting a thread creation
// will use a stale LDTR that doesn't reflect the structure's growth,
// causing a GP fault.
// Enforce the probable limit of passes through here to guard against an
// infinite loop if some other move to fs caused the GP fault. Note that
// this loop counter is ultimately a heuristic as it is possible for
// more than one thread to generate this fault at a time in an MP system.
// In the case of the loop count being exceeded or if the poll fails
// just fall through to a fatal error.
// If there is some other source of T_GPFLT traps and the text at EIP is
// unreadable this code will loop infinitely until the stack is exausted.
// The key to diagnosis in this case is to look for the bottom signal handler
// frame.
if(! IgnoreLibthreadGPFault) {
if (sig == SIGSEGV && uc->uc_mcontext.gregs[TRAPNO] == T_GPFLT) {
const unsigned char *p =
(unsigned const char *) uc->uc_mcontext.gregs[EIP];
// Expected instruction?
if(p[0] == movlfs[0] && p[1] == movlfs[1]) {
Atomic::inc(&ldtr_refresh);
// Infinite loop?
if(ldtr_refresh < ((2 << 16) / PAGESIZE)) {
// No, force scheduling to get a fresh view of the LDTR
if(poll(NULL, 0, 10) == 0) {
// Retry the move
return false;
}
}
}
}
}
#endif // !AMD64
if (!abort_if_unrecognized) {
// caller wants another chance, so give it to him
return false;

3
src/hotspot/share/runtime/globals.hpp
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@ -1061,9 +1061,6 @@ define_pd_global(uint64_t,MaxRAM, 1ULL*G);
manageable(bool, PrintClassHistogram, false, \
"Print a histogram of class instances") \
\
develop(bool, IgnoreLibthreadGPFault, false, \
"Suppress workaround for libthread GP fault") \
\
experimental(double, ObjectCountCutOffPercent, 0.5, \
"The percentage of the used heap that the instances of a class " \
"must occupy for the class to generate a trace event") \