76a878b8f8
Summary: For platforms which support slow unwinder only, we restrict the store context size to 1, basically only storing the current pc. We do this because the slow unwinder which is based on libunwind is not async signal safe and causes random freezes in forking applications as well as in signal handlers. Reviewed by eugenis. Differential: D23107 llvm-svn: 289027
32 lines
1.2 KiB
C++
32 lines
1.2 KiB
C++
// RUN: %clangxx_msan -fsanitize-memory-track-origins=2 -O0 %s -o %t && not %run %t >%t.out 2>&1
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// RUN: FileCheck --check-prefix=CHECK --check-prefix=CHECK-%short-stack %s < %t.out
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// RUN: %clangxx_msan -fsanitize-memory-track-origins=2 -O2 %s -o %t && not %run %t >%t.out 2>&1
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// RUN: FileCheck --check-prefix=CHECK --check-prefix=CHECK-%short-stack %s < %t.out
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// This is a regression test: there used to be broken "stored to memory at"
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// stacks with
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// in __msan_memcpy
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// in __msan::MsanReallocate
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// and nothing below that.
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#include <stdlib.h>
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int main(int argc, char **argv) {
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char *p = (char *)malloc(100);
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p = (char *)realloc(p, 10000);
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char x = p[50];
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free(p);
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return x;
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// CHECK: WARNING: MemorySanitizer: use-of-uninitialized-value
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// CHECK: {{#0 0x.* in main .*realloc-large-origin.cc:}}[[@LINE-3]]
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// CHECK: Uninitialized value was stored to memory at
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// CHECK-FULL-STACK: {{#0 0x.* in .*realloc}}
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// CHECK-FULL-STACK: {{#1 0x.* in main .*realloc-large-origin.cc:}}[[@LINE-10]]
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// CHECK-SHORT-STACK: {{#0 0x.* in .*realloc}}
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// CHECK: Uninitialized value was created by a heap allocation
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// CHECK: {{#0 0x.* in .*malloc}}
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// CHECK: {{#1 0x.* in main .*realloc-large-origin.cc:}}[[@LINE-16]]
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}
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