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BUG: KMSAN: uninit-value in build_id_parse+0x481/0xfd0 lib/buildid.c:147
 build_id_parse+0x481/0xfd0 lib/buildid.c:147
 perf_event_mmap_event kernel/events/core.c:8435 [inline]
 perf_event_mmap+0x29ba/0x2aa0 kernel/events/core.c:8578
 mmap_region+0x20a8/0x3e10 mm/mmap.c:1847
 do_mmap+0x1843/0x2310 mm/mmap.c:1575
 vm_mmap_pgoff+0x362/0x570 mm/util.c:519
 ksys_mmap_pgoff+0x90e/0xad0 mm/mmap.c:1624
 __do_sys_mmap_pgoff mm/mmap.c:1635 [inline]
 __se_sys_mmap_pgoff mm/mmap.c:1631 [inline]
 __ia32_sys_mmap_pgoff+0x1a0/0x200 mm/mmap.c:1631
 do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline]
 __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180
 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

Uninit was created at:
 __alloc_pages+0x8b3/0xfb0 mm/page_alloc.c:5421
 __alloc_pages_node include/linux/gfp.h:570 [inline]
 khugepaged_alloc_page mm/khugepaged.c:884 [inline]
 collapse_file+0x467/0x6280 mm/khugepaged.c:1658
 khugepaged_scan_file mm/khugepaged.c:2059 [inline]
 khugepaged_scan_mm_slot+0x2de8/0x3880 mm/khugepaged.c:2154
 khugepaged_do_scan+0x3e4/0x910 mm/khugepaged.c:2238
 khugepaged+0xb5/0x13b0 mm/khugepaged.c:2283
 kthread+0x66b/0x780 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30
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