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[HWASan] do not replace lifetime intrinsics with tagged address.
Quote from the LLVM Language Reference If ptr is a stack-allocated object and it points to the first byte of the object, the object is initially marked as dead. ptr is conservatively considered as a non-stack-allocated object if the stack coloring algorithm that is used in the optimization pipeline cannot conclude that ptr is a stack-allocated object. By replacing the alloca pointer with the tagged address before this change, we confused the stack coloring algorithm. Reviewed By: eugenis Differential Revision: https://reviews.llvm.org/D121835
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4 files changed

+96
-24
lines changed

4 files changed

+96
-24
lines changed

‎llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp

Lines changed: 32 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -13,6 +13,7 @@
1313

1414
#include "llvm/Transforms/Instrumentation/HWAddressSanitizer.h"
1515
#include "llvm/ADT/MapVector.h"
16+
#include "llvm/ADT/STLExtras.h"
1617
#include "llvm/ADT/SmallVector.h"
1718
#include "llvm/ADT/StringExtras.h"
1819
#include "llvm/ADT/StringRef.h"
@@ -1301,6 +1302,11 @@ bool HWAddressSanitizer::instrumentLandingPads(
13011302
return true;
13021303
}
13031304

1305+
static bool isLifetimeIntrinsic(Value *V) {
1306+
auto *II = dyn_cast<IntrinsicInst>(V);
1307+
return II && II->isLifetimeStartOrEnd();
1308+
}
1309+
13041310
bool HWAddressSanitizer::instrumentStack(
13051311
memtag::StackInfo &SInfo, Value *StackTag,
13061312
llvm::function_ref<const DominatorTree &()> GetDT,
@@ -1326,8 +1332,32 @@ bool HWAddressSanitizer::instrumentStack(
13261332
AI->hasName() ? AI->getName().str() : "alloca." + itostr(N);
13271333
Replacement->setName(Name + ".hwasan");
13281334

1329-
AI->replaceUsesWithIf(Replacement,
1330-
[AILong](Use &U) { return U.getUser() != AILong; });
1335+
size_t Size = memtag::getAllocaSizeInBytes(*AI);
1336+
size_t AlignedSize = alignTo(Size, Mapping.getObjectAlignment());
1337+
1338+
Value *AICast = IRB.CreatePointerCast(AI, Int8PtrTy);
1339+
1340+
auto HandleLifetime = [&](IntrinsicInst *II) {
1341+
// Set the lifetime intrinsic to cover the whole alloca. This reduces the
1342+
// set of assumptions we need to make about the lifetime. Without this we
1343+
// would need to ensure that we can track the lifetime pointer to a
1344+
// constant offset from the alloca, and would still need to change the
1345+
// size to include the extra alignment we use for the untagging to make
1346+
// the size consistent.
1347+
//
1348+
// The check for standard lifetime below makes sure that we have exactly
1349+
// one set of start / end in any execution (i.e. the ends are not
1350+
// reachable from each other), so this will not cause any problems.
1351+
II->setArgOperand(0, ConstantInt::get(Int64Ty, AlignedSize));
1352+
II->setArgOperand(1, AICast);
1353+
};
1354+
llvm::for_each(Info.LifetimeStart, HandleLifetime);
1355+
llvm::for_each(Info.LifetimeEnd, HandleLifetime);
1356+
1357+
AI->replaceUsesWithIf(Replacement, [AICast, AILong](Use &U) {
1358+
auto *User = U.getUser();
1359+
return User != AILong && User != AICast && !isLifetimeIntrinsic(User);
1360+
});
13311361

13321362
for (auto *DDI : Info.DbgVariableIntrinsics) {
13331363
// Prepend "tag_offset, N" to the dwarf expression.
@@ -1341,8 +1371,6 @@ bool HWAddressSanitizer::instrumentStack(
13411371
NewOps, LocNo));
13421372
}
13431373

1344-
size_t Size = memtag::getAllocaSizeInBytes(*AI);
1345-
size_t AlignedSize = alignTo(Size, Mapping.getObjectAlignment());
13461374
auto TagEnd = [&](Instruction *Node) {
13471375
IRB.SetInsertPoint(Node);
13481376
Value *UARTag = getUARTag(IRB, StackTag);

‎llvm/test/Instrumentation/HWAddressSanitizer/exception-lifetime.ll

Lines changed: 6 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -21,11 +21,13 @@ entry:
2121
%0 = bitcast i32* %x to i8*
2222
call void @llvm.lifetime.start.p0i8(i64 8, i8* %0)
2323
invoke void @mayFail(i32* %x) to label %invoke.cont unwind label %lpad
24+
; CHECK: [[CAST:%.*]] = bitcast { i32, [12 x i8] }* %x to i32*
25+
; CHECK: [[TMP1:%.*]] = bitcast i32* {{.*}}[[CAST]] to i8*
2426

2527
invoke.cont: ; preds = %entry
2628
; CHECK: invoke.cont:
27-
; CHECK: call void @llvm.memset.p0i8.i64(i8* align 1 %31, i8 0, i64 1, i1 false)
28-
; CHECK: call void @llvm.lifetime.end.p0i8(i64 8, i8* %28)
29+
; CHECK: call void @llvm.memset.p0i8.i64(i8* align 1 %{{.*}}, i8 0, i64 1, i1 false)
30+
; CHECK: call void @llvm.lifetime.end.p0i8(i64 16, i8* {{.*}}[[TMP1]])
2931
; CHECK: ret void
3032

3133
%1 = bitcast i32* %x to i8*
@@ -34,9 +36,8 @@ invoke.cont: ; preds = %entry
3436

3537
lpad: ; preds = %entry
3638
; CHECK: lpad
37-
; CHECK: %41 = getelementptr i8, i8* %17, i64 %40
38-
; CHECK: call void @llvm.memset.p0i8.i64(i8* align 1 %41, i8 0, i64 1, i1 false)
39-
; CHECK: call void @llvm.lifetime.end.p0i8(i64 8, i8* %38)
39+
; CHECK: call void @llvm.memset.p0i8.i64(i8* align 1 %{{.*}}, i8 0, i64 1, i1 false)
40+
; CHECK: call void @llvm.lifetime.end.p0i8(i64 16, i8* {{.*}}[[TMP1]])
4041
; CHECK: br label %eh.resume
4142

4243
%2 = landingpad { i8*, i32 }

‎llvm/test/Instrumentation/HWAddressSanitizer/stack-coloring.ll

Lines changed: 43 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,43 @@
1+
; Test that storage for allocas with disjoint lifetimes is reused with
2+
; use-after-scope.
3+
4+
; RUN: opt -S -passes=hwasan %s -hwasan-use-after-scope -o - | \
5+
; RUN: llc -no-stack-coloring=false -o - | \
6+
; RUN: FileCheck %s --check-prefix=COLOR
7+
; RUN: opt -S -passes=hwasan -hwasan-use-after-scope %s -o - | \
8+
; RUN: llc -no-stack-coloring=true -o - | \
9+
; RUN: FileCheck %s --check-prefix=NOCOLOR
10+
11+
target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
12+
target triple = "aarch64-unknown-linux-android29"
13+
14+
; REQUIRES: aarch64-registered-target
15+
16+
; COLOR: sub sp, sp, #240
17+
; NOCOLOR: sub sp, sp, #368
18+
19+
define i32 @myCall_w2(i32 %in) sanitize_hwaddress {
20+
entry:
21+
%a = alloca [17 x i8*], align 8
22+
%a2 = alloca [16 x i8*], align 8
23+
%b = bitcast [17 x i8*]* %a to i8*
24+
%b2 = bitcast [16 x i8*]* %a2 to i8*
25+
call void @llvm.lifetime.start.p0i8(i64 136, i8* %b)
26+
%t1 = call i32 @foo(i32 %in, i8* %b)
27+
%t2 = call i32 @foo(i32 %in, i8* %b)
28+
call void @llvm.lifetime.end.p0i8(i64 136, i8* %b)
29+
call void @llvm.lifetime.start.p0i8(i64 128, i8* %b2)
30+
%t3 = call i32 @foo(i32 %in, i8* %b2)
31+
%t4 = call i32 @foo(i32 %in, i8* %b2)
32+
call void @llvm.lifetime.end.p0i8(i64 128, i8* %b2)
33+
%t5 = add i32 %t1, %t2
34+
%t6 = add i32 %t3, %t4
35+
%t7 = add i32 %t5, %t6
36+
ret i32 %t7
37+
}
38+
39+
declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) nounwind
40+
41+
declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) nounwind
42+
43+
declare i32 @foo(i32, i8*)

‎llvm/test/Instrumentation/HWAddressSanitizer/use-after-scope.ll

Lines changed: 15 additions & 15 deletions
Original file line numberDiff line numberDiff line change
@@ -35,12 +35,12 @@ define dso_local i32 @standard_lifetime() local_unnamed_addr sanitize_hwaddress
3535
; X86-SCOPE-NEXT: [[ALLOCA_0_HWASAN:%.*]] = inttoptr i64 [[TMP7]] to i8*
3636
; X86-SCOPE-NEXT: br label [[TMP8:%.*]]
3737
; X86-SCOPE: 8:
38-
; X86-SCOPE-NEXT: call void @llvm.lifetime.start.p0i8(i64 1, i8* nonnull [[ALLOCA_0_HWASAN]])
38+
; X86-SCOPE-NEXT: call void @llvm.lifetime.start.p0i8(i64 16, i8* nonnull [[TMP2]])
3939
; X86-SCOPE-NEXT: [[TMP9:%.*]] = trunc i64 [[TMP4]] to i8
4040
; X86-SCOPE-NEXT: call void @__hwasan_tag_memory(i8* [[TMP2]], i8 [[TMP9]], i64 16)
4141
; X86-SCOPE-NEXT: [[TMP10:%.*]] = tail call i1 (...) @cond()
4242
; X86-SCOPE-NEXT: call void @__hwasan_tag_memory(i8* [[TMP2]], i8 0, i64 16)
43-
; X86-SCOPE-NEXT: call void @llvm.lifetime.end.p0i8(i64 1, i8* nonnull [[ALLOCA_0_HWASAN]])
43+
; X86-SCOPE-NEXT: call void @llvm.lifetime.end.p0i8(i64 16, i8* nonnull [[TMP2]])
4444
; X86-SCOPE-NEXT: br i1 [[TMP10]], label [[TMP11:%.*]], label [[TMP8]]
4545
; X86-SCOPE: 11:
4646
; X86-SCOPE-NEXT: call void @use(i8* nonnull [[ALLOCA_0_HWASAN]])
@@ -99,7 +99,7 @@ define dso_local i32 @standard_lifetime() local_unnamed_addr sanitize_hwaddress
9999
; AARCH64-SCOPE-NEXT: [[ALLOCA_0_HWASAN:%.*]] = inttoptr i64 [[TMP25]] to i8*
100100
; AARCH64-SCOPE-NEXT: br label [[TMP26:%.*]]
101101
; AARCH64-SCOPE: 26:
102-
; AARCH64-SCOPE-NEXT: call void @llvm.lifetime.start.p0i8(i64 1, i8* nonnull [[ALLOCA_0_HWASAN]])
102+
; AARCH64-SCOPE-NEXT: call void @llvm.lifetime.start.p0i8(i64 16, i8* nonnull [[TMP20]])
103103
; AARCH64-SCOPE-NEXT: [[TMP27:%.*]] = trunc i64 [[TMP22]] to i8
104104
; AARCH64-SCOPE-NEXT: [[TMP28:%.*]] = ptrtoint i8* [[TMP20]] to i64
105105
; AARCH64-SCOPE-NEXT: [[TMP29:%.*]] = lshr i64 [[TMP28]], 4
@@ -110,7 +110,7 @@ define dso_local i32 @standard_lifetime() local_unnamed_addr sanitize_hwaddress
110110
; AARCH64-SCOPE-NEXT: [[TMP33:%.*]] = lshr i64 [[TMP32]], 4
111111
; AARCH64-SCOPE-NEXT: [[TMP34:%.*]] = getelementptr i8, i8* [[TMP18]], i64 [[TMP33]]
112112
; AARCH64-SCOPE-NEXT: call void @llvm.memset.p0i8.i64(i8* align 1 [[TMP34]], i8 0, i64 1, i1 false)
113-
; AARCH64-SCOPE-NEXT: call void @llvm.lifetime.end.p0i8(i64 1, i8* nonnull [[ALLOCA_0_HWASAN]])
113+
; AARCH64-SCOPE-NEXT: call void @llvm.lifetime.end.p0i8(i64 16, i8* nonnull [[TMP20]])
114114
; AARCH64-SCOPE-NEXT: br i1 [[TMP31]], label [[TMP35:%.*]], label [[TMP26]]
115115
; AARCH64-SCOPE: 35:
116116
; AARCH64-SCOPE-NEXT: call void @use(i8* nonnull [[ALLOCA_0_HWASAN]])
@@ -195,7 +195,7 @@ define dso_local i32 @standard_lifetime() local_unnamed_addr sanitize_hwaddress
195195
; AARCH64-SHORT-SCOPE-NEXT: [[ALLOCA_0_HWASAN:%.*]] = inttoptr i64 [[TMP25]] to i8*
196196
; AARCH64-SHORT-SCOPE-NEXT: br label [[TMP26:%.*]]
197197
; AARCH64-SHORT-SCOPE: 26:
198-
; AARCH64-SHORT-SCOPE-NEXT: call void @llvm.lifetime.start.p0i8(i64 1, i8* nonnull [[ALLOCA_0_HWASAN]])
198+
; AARCH64-SHORT-SCOPE-NEXT: call void @llvm.lifetime.start.p0i8(i64 16, i8* nonnull [[TMP20]])
199199
; AARCH64-SHORT-SCOPE-NEXT: [[TMP27:%.*]] = trunc i64 [[TMP22]] to i8
200200
; AARCH64-SHORT-SCOPE-NEXT: [[TMP28:%.*]] = ptrtoint i8* [[TMP20]] to i64
201201
; AARCH64-SHORT-SCOPE-NEXT: [[TMP29:%.*]] = lshr i64 [[TMP28]], 4
@@ -209,7 +209,7 @@ define dso_local i32 @standard_lifetime() local_unnamed_addr sanitize_hwaddress
209209
; AARCH64-SHORT-SCOPE-NEXT: [[TMP35:%.*]] = lshr i64 [[TMP34]], 4
210210
; AARCH64-SHORT-SCOPE-NEXT: [[TMP36:%.*]] = getelementptr i8, i8* [[TMP18]], i64 [[TMP35]]
211211
; AARCH64-SHORT-SCOPE-NEXT: call void @llvm.memset.p0i8.i64(i8* align 1 [[TMP36]], i8 0, i64 1, i1 false)
212-
; AARCH64-SHORT-SCOPE-NEXT: call void @llvm.lifetime.end.p0i8(i64 1, i8* nonnull [[ALLOCA_0_HWASAN]])
212+
; AARCH64-SHORT-SCOPE-NEXT: call void @llvm.lifetime.end.p0i8(i64 16, i8* nonnull [[TMP20]])
213213
; AARCH64-SHORT-SCOPE-NEXT: br i1 [[TMP33]], label [[TMP37:%.*]], label [[TMP26]]
214214
; AARCH64-SHORT-SCOPE: 37:
215215
; AARCH64-SHORT-SCOPE-NEXT: call void @use(i8* nonnull [[ALLOCA_0_HWASAN]])
@@ -294,12 +294,12 @@ define dso_local i32 @standard_lifetime_optnone() local_unnamed_addr optnone noi
294294
; X86-SCOPE-NEXT: [[ALLOCA_0_HWASAN:%.*]] = inttoptr i64 [[TMP7]] to i8*
295295
; X86-SCOPE-NEXT: br label [[TMP8:%.*]]
296296
; X86-SCOPE: 8:
297-
; X86-SCOPE-NEXT: call void @llvm.lifetime.start.p0i8(i64 1, i8* nonnull [[ALLOCA_0_HWASAN]])
297+
; X86-SCOPE-NEXT: call void @llvm.lifetime.start.p0i8(i64 16, i8* nonnull [[TMP2]])
298298
; X86-SCOPE-NEXT: [[TMP9:%.*]] = trunc i64 [[TMP4]] to i8
299299
; X86-SCOPE-NEXT: call void @__hwasan_tag_memory(i8* [[TMP2]], i8 [[TMP9]], i64 16)
300300
; X86-SCOPE-NEXT: [[TMP10:%.*]] = tail call i1 (...) @cond()
301301
; X86-SCOPE-NEXT: call void @__hwasan_tag_memory(i8* [[TMP2]], i8 0, i64 16)
302-
; X86-SCOPE-NEXT: call void @llvm.lifetime.end.p0i8(i64 1, i8* nonnull [[ALLOCA_0_HWASAN]])
302+
; X86-SCOPE-NEXT: call void @llvm.lifetime.end.p0i8(i64 16, i8* nonnull [[TMP2]])
303303
; X86-SCOPE-NEXT: br i1 [[TMP10]], label [[TMP11:%.*]], label [[TMP8]]
304304
; X86-SCOPE: 11:
305305
; X86-SCOPE-NEXT: call void @use(i8* nonnull [[ALLOCA_0_HWASAN]])
@@ -358,7 +358,7 @@ define dso_local i32 @standard_lifetime_optnone() local_unnamed_addr optnone noi
358358
; AARCH64-SCOPE-NEXT: [[ALLOCA_0_HWASAN:%.*]] = inttoptr i64 [[TMP25]] to i8*
359359
; AARCH64-SCOPE-NEXT: br label [[TMP26:%.*]]
360360
; AARCH64-SCOPE: 26:
361-
; AARCH64-SCOPE-NEXT: call void @llvm.lifetime.start.p0i8(i64 1, i8* nonnull [[ALLOCA_0_HWASAN]])
361+
; AARCH64-SCOPE-NEXT: call void @llvm.lifetime.start.p0i8(i64 16, i8* nonnull [[TMP20]])
362362
; AARCH64-SCOPE-NEXT: [[TMP27:%.*]] = trunc i64 [[TMP22]] to i8
363363
; AARCH64-SCOPE-NEXT: [[TMP28:%.*]] = ptrtoint i8* [[TMP20]] to i64
364364
; AARCH64-SCOPE-NEXT: [[TMP29:%.*]] = lshr i64 [[TMP28]], 4
@@ -369,7 +369,7 @@ define dso_local i32 @standard_lifetime_optnone() local_unnamed_addr optnone noi
369369
; AARCH64-SCOPE-NEXT: [[TMP33:%.*]] = lshr i64 [[TMP32]], 4
370370
; AARCH64-SCOPE-NEXT: [[TMP34:%.*]] = getelementptr i8, i8* [[TMP18]], i64 [[TMP33]]
371371
; AARCH64-SCOPE-NEXT: call void @llvm.memset.p0i8.i64(i8* align 1 [[TMP34]], i8 0, i64 1, i1 false)
372-
; AARCH64-SCOPE-NEXT: call void @llvm.lifetime.end.p0i8(i64 1, i8* nonnull [[ALLOCA_0_HWASAN]])
372+
; AARCH64-SCOPE-NEXT: call void @llvm.lifetime.end.p0i8(i64 16, i8* nonnull [[TMP20]])
373373
; AARCH64-SCOPE-NEXT: br i1 [[TMP31]], label [[TMP35:%.*]], label [[TMP26]]
374374
; AARCH64-SCOPE: 35:
375375
; AARCH64-SCOPE-NEXT: call void @use(i8* nonnull [[ALLOCA_0_HWASAN]])
@@ -454,7 +454,7 @@ define dso_local i32 @standard_lifetime_optnone() local_unnamed_addr optnone noi
454454
; AARCH64-SHORT-SCOPE-NEXT: [[ALLOCA_0_HWASAN:%.*]] = inttoptr i64 [[TMP25]] to i8*
455455
; AARCH64-SHORT-SCOPE-NEXT: br label [[TMP26:%.*]]
456456
; AARCH64-SHORT-SCOPE: 26:
457-
; AARCH64-SHORT-SCOPE-NEXT: call void @llvm.lifetime.start.p0i8(i64 1, i8* nonnull [[ALLOCA_0_HWASAN]])
457+
; AARCH64-SHORT-SCOPE-NEXT: call void @llvm.lifetime.start.p0i8(i64 16, i8* nonnull [[TMP20]])
458458
; AARCH64-SHORT-SCOPE-NEXT: [[TMP27:%.*]] = trunc i64 [[TMP22]] to i8
459459
; AARCH64-SHORT-SCOPE-NEXT: [[TMP28:%.*]] = ptrtoint i8* [[TMP20]] to i64
460460
; AARCH64-SHORT-SCOPE-NEXT: [[TMP29:%.*]] = lshr i64 [[TMP28]], 4
@@ -468,7 +468,7 @@ define dso_local i32 @standard_lifetime_optnone() local_unnamed_addr optnone noi
468468
; AARCH64-SHORT-SCOPE-NEXT: [[TMP35:%.*]] = lshr i64 [[TMP34]], 4
469469
; AARCH64-SHORT-SCOPE-NEXT: [[TMP36:%.*]] = getelementptr i8, i8* [[TMP18]], i64 [[TMP35]]
470470
; AARCH64-SHORT-SCOPE-NEXT: call void @llvm.memset.p0i8.i64(i8* align 1 [[TMP36]], i8 0, i64 1, i1 false)
471-
; AARCH64-SHORT-SCOPE-NEXT: call void @llvm.lifetime.end.p0i8(i64 1, i8* nonnull [[ALLOCA_0_HWASAN]])
471+
; AARCH64-SHORT-SCOPE-NEXT: call void @llvm.lifetime.end.p0i8(i64 16, i8* nonnull [[TMP20]])
472472
; AARCH64-SHORT-SCOPE-NEXT: br i1 [[TMP33]], label [[TMP37:%.*]], label [[TMP26]]
473473
; AARCH64-SHORT-SCOPE: 37:
474474
; AARCH64-SHORT-SCOPE-NEXT: call void @use(i8* nonnull [[ALLOCA_0_HWASAN]])
@@ -776,7 +776,7 @@ define dso_local i32 @unreachable_exit() local_unnamed_addr sanitize_hwaddress {
776776
; X86-SCOPE-NEXT: [[TMP6:%.*]] = shl i64 [[TMP4]], 57
777777
; X86-SCOPE-NEXT: [[TMP7:%.*]] = or i64 [[TMP5]], [[TMP6]]
778778
; X86-SCOPE-NEXT: [[ALLOCA_0_HWASAN:%.*]] = inttoptr i64 [[TMP7]] to i8*
779-
; X86-SCOPE-NEXT: call void @llvm.lifetime.start.p0i8(i64 1, i8* nonnull [[ALLOCA_0_HWASAN]])
779+
; X86-SCOPE-NEXT: call void @llvm.lifetime.start.p0i8(i64 16, i8* nonnull [[TMP2]])
780780
; X86-SCOPE-NEXT: [[TMP8:%.*]] = trunc i64 [[TMP4]] to i8
781781
; X86-SCOPE-NEXT: call void @__hwasan_tag_memory(i8* [[TMP2]], i8 [[TMP8]], i64 16)
782782
; X86-SCOPE-NEXT: [[TMP9:%.*]] = tail call i1 (...) @cond()
@@ -841,7 +841,7 @@ define dso_local i32 @unreachable_exit() local_unnamed_addr sanitize_hwaddress {
841841
; AARCH64-SCOPE-NEXT: [[TMP24:%.*]] = shl i64 [[TMP22]], 56
842842
; AARCH64-SCOPE-NEXT: [[TMP25:%.*]] = or i64 [[TMP23]], [[TMP24]]
843843
; AARCH64-SCOPE-NEXT: [[ALLOCA_0_HWASAN:%.*]] = inttoptr i64 [[TMP25]] to i8*
844-
; AARCH64-SCOPE-NEXT: call void @llvm.lifetime.start.p0i8(i64 1, i8* nonnull [[ALLOCA_0_HWASAN]])
844+
; AARCH64-SCOPE-NEXT: call void @llvm.lifetime.start.p0i8(i64 16, i8* nonnull [[TMP20]])
845845
; AARCH64-SCOPE-NEXT: [[TMP26:%.*]] = trunc i64 [[TMP22]] to i8
846846
; AARCH64-SCOPE-NEXT: [[TMP27:%.*]] = ptrtoint i8* [[TMP20]] to i64
847847
; AARCH64-SCOPE-NEXT: [[TMP28:%.*]] = lshr i64 [[TMP27]], 4
@@ -944,7 +944,7 @@ define dso_local i32 @unreachable_exit() local_unnamed_addr sanitize_hwaddress {
944944
; AARCH64-SHORT-SCOPE-NEXT: [[TMP24:%.*]] = shl i64 [[TMP22]], 56
945945
; AARCH64-SHORT-SCOPE-NEXT: [[TMP25:%.*]] = or i64 [[TMP23]], [[TMP24]]
946946
; AARCH64-SHORT-SCOPE-NEXT: [[ALLOCA_0_HWASAN:%.*]] = inttoptr i64 [[TMP25]] to i8*
947-
; AARCH64-SHORT-SCOPE-NEXT: call void @llvm.lifetime.start.p0i8(i64 1, i8* nonnull [[ALLOCA_0_HWASAN]])
947+
; AARCH64-SHORT-SCOPE-NEXT: call void @llvm.lifetime.start.p0i8(i64 16, i8* nonnull [[TMP20]])
948948
; AARCH64-SHORT-SCOPE-NEXT: [[TMP26:%.*]] = trunc i64 [[TMP22]] to i8
949949
; AARCH64-SHORT-SCOPE-NEXT: [[TMP27:%.*]] = ptrtoint i8* [[TMP20]] to i64
950950
; AARCH64-SHORT-SCOPE-NEXT: [[TMP28:%.*]] = lshr i64 [[TMP27]], 4

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