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2025/5/30 19:32, Lorenzo Stoakes wrote: > > On Thu, May 29, 2025 at 03:56:50PM +0000, Pu Lehui wrote: > > > From: Pu Lehui > > > > > > Add test about uprobe pte be orphan during vma merge. > > > > > > Signed-off-by: Pu Lehui > > > --- > > > tools/testing/selftests/mm/merge.c | 42 ++++++++++++++++++++++++++++++ > > > 1 file changed, 42 insertions(+) > > > > > > diff --git a/tools/testing/selftests/mm/merge.c b/tools/testing/selftests/mm/merge.c > > > index c76646cdf6e6..8e1f38d23384 100644 > > > --- a/tools/testing/selftests/mm/merge.c > > > +++ b/tools/testing/selftests/mm/merge.c > > > @@ -2,11 +2,13 @@ > > > > > > #define _GNU_SOURCE > > > #include "../kselftest_harness.h" > > > +#include > > > #include > > > #include > > > #include > > > #include > > > #include > > > +#include > > > #include "vm_util.h" > > > > Need to include sys/syscall.h... > > > > > > > > FIXTURE(merge) > > > @@ -452,4 +454,44 @@ TEST_F(merge, forked_source_vma) > > > ASSERT_EQ(procmap->query.vma_end, (unsigned long)ptr2 + 5 * page_size); > > > } > > > > > > +TEST_F(merge, handle_uprobe_upon_merged_vma) > > > +{ > > > + const size_t attr_sz = sizeof(struct perf_event_attr); > > > + unsigned int page_size = self->page_size; > > > + const char *probe_file = "./foo"; > > > + char *carveout = self->carveout; > > > + struct perf_event_attr attr; > > > + unsigned long type; > > > + void *ptr1, *ptr2; > > > + int fd; > > > + > > > + fd = open(probe_file, O_RDWR|O_CREAT, 0600); > > > + ASSERT_GE(fd, 0); > > > + > > > + ASSERT_EQ(ftruncate(fd, page_size), 0); > > > + ASSERT_EQ(read_sysfs("/sys/bus/event_source/devices/uprobe/type", &type), 0); > > > + > > > + memset(&attr, 0, attr_sz); > > > + attr.size = attr_sz; > > > + attr.type = type; > > > + attr.config1 = (__u64)(long)probe_file; > > > + attr.config2 = 0x0; > > > + > > > + ASSERT_GE(syscall(__NR_perf_event_open, &attr, 0, -1, -1, 0), 0); > > > > ...Because this results in: > > > > In file included from merge.c:4: > > merge.c: In function ‘merge_handle_uprobe_upon_merged_vma’: > > merge.c:480:27: error: ‘__NR_perf_event_open’ undeclared (first use in this function) > > 480 | ASSERT_GE(syscall(__NR_perf_event_open, &attr, 0, -1, -1, 0), 0); > > > > I did not encounter this problem when compiling in the > tools/testing/selftests/mm directory, but in any case, adding the > sys/syscall.h header file makes sense. Weird, it can depend on what system headers are implicitly included due to a header in the dependency chain including something else. At any rate, I think Andrew has already updated this? If you send a respin obviously do include this fix. > > > Otherwise :>) > > > > > + > > > + ptr1 = mmap(&carveout[page_size], 10 * page_size, PROT_EXEC, > > > + MAP_PRIVATE | MAP_FIXED, fd, 0); > > > + ASSERT_NE(ptr1, MAP_FAILED); > > > + > > > + ptr2 = mremap(ptr1, page_size, 2 * page_size, > > > + MREMAP_MAYMOVE | MREMAP_FIXED, ptr1 + 5 * page_size); > > > + ASSERT_NE(ptr2, MAP_FAILED); > > > + > > > + ASSERT_NE(mremap(ptr2, page_size, page_size, > > > + MREMAP_MAYMOVE | MREMAP_FIXED, ptr1), MAP_FAILED); > > > + > > > + close(fd); > > > + remove(probe_file); > > > +} > > > + > > > TEST_HARNESS_MAIN > > > -- > > > 2.34.1 > > > >