Index: lib/sanitizer_common/sanitizer_common_interceptors.inc
===================================================================
--- lib/sanitizer_common/sanitizer_common_interceptors.inc
+++ lib/sanitizer_common/sanitizer_common_interceptors.inc
@@ -2446,6 +2446,7 @@
 INTERCEPTOR(uptr, ptrace, int request, int pid, void *addr, void *data) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, ptrace, request, pid, addr, data);
+  __sanitizer_iovec local_iovec;
 
   if (data) {
     if (request == ptrace_setregs)
@@ -2456,9 +2457,15 @@
       COMMON_INTERCEPTOR_READ_RANGE(ctx, data, struct_user_fpxregs_struct_sz);
     else if (request == ptrace_setsiginfo)
       COMMON_INTERCEPTOR_READ_RANGE(ctx, data, siginfo_t_sz);
-    else if (request == ptrace_setregset) {
-      __sanitizer_iovec *iov = (__sanitizer_iovec *)data;
-      COMMON_INTERCEPTOR_READ_RANGE(ctx, iov->iov_base, iov->iov_len);
+    // Some kernel might zero the iovec::iov_base in case of invalid
+    // write access.  In this case copy the invalid address for further
+    // inspection.
+    else if (request == ptrace_setregset || request == ptrace_getregset) {
+      __sanitizer_iovec *iovec = (__sanitizer_iovec*)data;
+      COMMON_INTERCEPTOR_READ_RANGE(ctx, iovec, sizeof(*iovec));
+      local_iovec = *iovec;
+      if (request == ptrace_setregset)
+        COMMON_INTERCEPTOR_READ_RANGE(ctx, iovec->iov_base, iovec->iov_len);
     }
   }
 
@@ -2481,8 +2488,10 @@
     else if (request == ptrace_geteventmsg)
       COMMON_INTERCEPTOR_WRITE_RANGE(ctx, data, sizeof(unsigned long));
     else if (request == ptrace_getregset) {
-      __sanitizer_iovec *iov = (__sanitizer_iovec *)data;
-      COMMON_INTERCEPTOR_WRITE_RANGE(ctx, iov->iov_base, iov->iov_len);
+      __sanitizer_iovec *iovec = (__sanitizer_iovec*)data;
+      COMMON_INTERCEPTOR_WRITE_RANGE(ctx, iovec, sizeof(*iovec));
+      COMMON_INTERCEPTOR_WRITE_RANGE(ctx, local_iovec.iov_base,
+                                     local_iovec.iov_len);
     }
   }
   return res;
Index: test/asan/TestCases/Linux/ptrace.cc
===================================================================
--- test/asan/TestCases/Linux/ptrace.cc
+++ test/asan/TestCases/Linux/ptrace.cc
@@ -3,7 +3,6 @@
 //
 // RUN: %clangxx_asan -O0 %s -o %t && %run %t
 // RUN: %clangxx_asan -DPOSITIVE -O0 %s -o %t && not %run %t 2>&1 | FileCheck %s
-// REQUIRES: x86_64-supported-target,i386-supported-target
 
 #include <assert.h>
 #include <stdio.h>
@@ -12,6 +11,52 @@
 #include <sys/user.h>
 #include <sys/wait.h>
 #include <unistd.h>
+#include <sys/uio.h> // for iovec
+#include <elf.h> // for NT_PRSTATUS
+
+#if defined(__i386__) || defined(__x86_64__)
+typedef user_regs_struct   regs_struct;
+typedef user_fpregs_struct fpregs_struct;
+#if defined(__i386__)
+#define REG_IP  eip
+#else
+#define REG_IP  rip
+#endif
+#define PRINT_REG_PC(__regs)    printf ("%lx\n", (unsigned long) (__regs.REG_IP))
+#define PRINT_REG_FP(__fpregs)  printf ("%lx\n", (unsigned long) (__fpregs.cwd))
+#define __PTRACE_FPREQUEST PTRACE_GETFPREGS
+
+#elif defined(__aarch64__)
+typedef struct user_pt_regs      regs_struct;
+typedef struct user_fpsimd_state fpregs_struct;
+#define PRINT_REG_PC(__regs)    printf ("%x\n", (unsigned) (__regs.pc))
+#define PRINT_REG_FP(__fpregs)  printf ("%x\n", (unsigned) (__fpregs.fpsr))
+#define ARCH_IOVEC_FOR_GETREGSET
+
+#elif defined(__powerpc64__)
+typedef struct pt_regs regs_struct;
+typedef elf_fpregset_t fpregs_struct;
+#define PRINT_REG_PC(__regs)    printf ("%lx\n", (unsigned long) (__regs.nip))
+#define PRINT_REG_FP(__fpregs)  printf ("%lx\n", (elf_greg_t)fpregs[32])
+#define ARCH_IOVEC_FOR_GETREGSET
+
+#elif defined(__mips64)
+typedef struct pt_regs regs_struct;
+typedef elf_fpregset_t fpregs_struct;
+#define PRINT_REG_PC(__regs)    printf ("%lx\n", (unsigned long) (__regs.cp0_epc))
+#define PRINT_REG_FP(__fpregs)  printf ("%lx\n", (elf_greg_t) (__fpregs[32]))
+#define __PTRACE_FPREQUEST PTRACE_GETFPREGS
+
+#elif defined(__arm__)
+# include <asm/ptrace.h>
+# include <sys/procfs.h>
+typedef struct pt_regs regs_struct;
+typedef char fpregs_struct[ARM_VFPREGS_SIZE];
+#define PRINT_REG_PC(__regs)    printf ("%x\n", (unsigned) (__regs.ARM_pc))
+#define PRINT_REG_FP(__fpregs)  printf ("%x\n", (unsigned) (__fpregs + 32 * 8))
+#define __PTRACE_FPREQUEST PTRACE_GETVFPREGS
+#endif
+
 
 int main(void) {
   pid_t pid;
@@ -21,28 +66,48 @@
     execl("/bin/true", "true", NULL);
   } else {
     wait(NULL);
-    user_regs_struct regs;
+    regs_struct regs;
+    regs_struct* volatile pregs = &regs;
+#ifdef ARCH_IOVEC_FOR_GETREGSET
+    struct iovec regset_io;
+#endif
     int res;
-    user_regs_struct * volatile pregs = &regs;
+
 #ifdef POSITIVE
     ++pregs;
 #endif
-    res = ptrace(PTRACE_GETREGS, pid, NULL, pregs);
+
+#ifdef ARCH_IOVEC_FOR_GETREGSET
+# define __PTRACE_REQUEST  PTRACE_GETREGSET
+# define __PTRACE_ARGS     (void*)NT_PRSTATUS, (void*)&regset_io
+    regset_io.iov_base = pregs;
+    regset_io.iov_len = sizeof(regs_struct);
+#else
+# define __PTRACE_REQUEST  PTRACE_GETREGS
+# define __PTRACE_ARGS     NULL, pregs
+#endif
+    res = ptrace((enum __ptrace_request)__PTRACE_REQUEST, pid, __PTRACE_ARGS);
     // CHECK: AddressSanitizer: stack-buffer-overflow
     // CHECK: {{.*ptrace.cc:}}[[@LINE-2]]
     assert(!res);
-#ifdef __x86_64__
-    printf("%lx\n", (unsigned long)regs.rip);
+    PRINT_REG_PC(regs);
+
+    fpregs_struct fpregs;
+#ifdef ARCH_IOVEC_FOR_GETREGSET
+# define __PTRACE_FPREQUEST  PTRACE_GETREGSET
+# define __PTRACE_FPARGS     (void*)NT_PRSTATUS, (void*)&regset_io
+    regset_io.iov_base = &fpregs;
+    regset_io.iov_len = sizeof(fpregs_struct);
+    res = ptrace((enum __ptrace_request)PTRACE_GETREGSET, pid, (void*)NT_FPREGSET,
+                 (void*)&regset_io);
 #else
-    printf("%lx\n", regs.eip);
+# define __PTRACE_FPARGS     NULL, &fpregs
 #endif
-
-    user_fpregs_struct fpregs;
-    res = ptrace(PTRACE_GETFPREGS, pid, NULL, &fpregs);
+    res = ptrace((enum __ptrace_request)__PTRACE_FPREQUEST, pid, __PTRACE_FPARGS);
     assert(!res);
-    printf("%lx\n", (unsigned long)fpregs.cwd);
+    PRINT_REG_FP(fpregs);
 
-#ifndef __x86_64__
+#ifdef __i386__
     user_fpxregs_struct fpxregs;
     res = ptrace(PTRACE_GETFPXREGS, pid, NULL, &fpxregs);
     assert(!res);