8294003: Don't handle si_addr == 0 && si_code == SI_KERNEL SIGSEGVs

Reviewed-by: dholmes, shade, dlong

src/hotspot/os_cpu/linux_x86/os_linux_x86.cpp

@@ -219,15 +219,11 @@ bool PosixSignals::pd_hotspot_signal_handler(int sig, siginfo_t* info,
   if (info != NULL && uc != NULL && thread != NULL) {
     pc = (address) os::Posix::ucontext_get_pc(uc);
 
-#ifndef AMD64
-    // Halt if SI_KERNEL before more crashes get misdiagnosed as Java bugs
-    // This can happen in any running code (currently more frequently in
-    // interpreter code but has been seen in compiled code)
     if (sig == SIGSEGV && info->si_addr == 0 && info->si_code == SI_KERNEL) {
-      fatal("An irrecoverable SI_KERNEL SIGSEGV has occurred due "
-            "to unstable signal handling in this distribution.");
+      // An irrecoverable SI_KERNEL SIGSEGV has occurred.
+      // It's likely caused by dereferencing an address larger than TASK_SIZE.
+      return false;
     }
-#endif // AMD64
 
     // Handle ALL stack overflow variations here
     if (sig == SIGSEGV) {