================================================================== BUG: KCSAN: data-race in __delete_from_page_cache / shmem_getpage_gfp read-write to 0xffff88810ba92558 of 8 bytes by task 11327 on cpu 0: page_cache_delete mm/filemap.c:154 [inline] __delete_from_page_cache+0x26e/0x340 mm/filemap.c:239 delete_from_page_cache+0x84/0x260 mm/filemap.c:274 truncate_inode_page+0x41/0x50 mm/truncate.c:228 shmem_undo_range+0x3fc/0x12b0 mm/shmem.c:949 shmem_truncate_range mm/shmem.c:1058 [inline] shmem_fallocate+0x28e/0x870 mm/shmem.c:2800 vfs_fallocate+0x471/0x6c0 fs/open.c:309 madvise_remove+0x19c/0x200 mm/madvise.c:865 madvise_vma mm/madvise.c:927 [inline] do_madvise+0x4c9/0xdc0 mm/madvise.c:1132 __do_sys_madvise mm/madvise.c:1158 [inline] __se_sys_madvise mm/madvise.c:1156 [inline] __x64_sys_madvise+0x5d/0x70 mm/madvise.c:1156 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88810ba92558 of 8 bytes by task 11310 on cpu 1: shmem_recalc_inode mm/shmem.c:367 [inline] shmem_getpage_gfp+0xb9a/0x1960 mm/shmem.c:1937 shmem_fault+0x16c/0x450 mm/shmem.c:2114 __do_fault mm/memory.c:3625 [inline] do_read_fault+0x403/0x760 mm/memory.c:4019 do_fault mm/memory.c:4147 [inline] handle_pte_fault mm/memory.c:4387 [inline] __handle_mm_fault mm/memory.c:4522 [inline] handle_mm_fault+0xff1/0x17b0 mm/memory.c:4620 faultin_page mm/gup.c:851 [inline] __get_user_pages+0xa32/0xff0 mm/gup.c:1070 populate_vma_page_range mm/gup.c:1403 [inline] __mm_populate+0x24d/0x380 mm/gup.c:1451 mm_populate include/linux/mm.h:2591 [inline] vm_mmap_pgoff+0x14c/0x1d0 mm/util.c:524 ksys_mmap_pgoff+0xe1/0x380 mm/mmap.c:1634 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 11310 Comm: syz-executor.2 Not tainted 5.11.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================