================================================================== BUG: KCSAN: data-race in __delete_from_page_cache / shmem_getpage_gfp write to 0xffff8880921a37e8 of 8 bytes by task 3909 on cpu 0: page_cache_delete mm/filemap.c:154 [inline] __delete_from_page_cache+0x282/0x380 mm/filemap.c:239 delete_from_page_cache+0x84/0x250 mm/filemap.c:274 truncate_inode_page+0x41/0x50 mm/truncate.c:228 shmem_undo_range+0x3fb/0x1180 mm/shmem.c:949 shmem_truncate_range mm/shmem.c:1058 [inline] shmem_fallocate+0x28b/0x830 mm/shmem.c:2795 vfs_fallocate+0x43c/0x5d0 fs/open.c:309 madvise_remove mm/madvise.c:857 [inline] madvise_vma mm/madvise.c:940 [inline] do_madvise+0x83d/0x14f0 mm/madvise.c:1145 __do_sys_madvise mm/madvise.c:1171 [inline] __se_sys_madvise mm/madvise.c:1169 [inline] __x64_sys_madvise+0x3e/0x50 mm/madvise.c:1169 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8880921a37e8 of 8 bytes by task 3907 on cpu 1: shmem_recalc_inode mm/shmem.c:367 [inline] shmem_getpage_gfp+0xb7c/0x19c0 mm/shmem.c:1930 shmem_fault+0x16c/0x430 mm/shmem.c:2107 __do_fault mm/memory.c:3450 [inline] do_read_fault+0x41f/0x760 mm/memory.c:3843 do_fault mm/memory.c:3971 [inline] handle_pte_fault mm/memory.c:4211 [inline] __handle_mm_fault mm/memory.c:4346 [inline] handle_mm_fault+0x14e9/0x1af0 mm/memory.c:4444 faultin_page mm/gup.c:878 [inline] __get_user_pages+0xa3d/0x1010 mm/gup.c:1090 populate_vma_page_range mm/gup.c:1420 [inline] __mm_populate+0x24d/0x340 mm/gup.c:1468 mm_populate include/linux/mm.h:2566 [inline] vm_mmap_pgoff+0x133/0x170 mm/util.c:511 ksys_mmap_pgoff+0xe1/0x380 mm/mmap.c:1596 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: 3907 Comm: syz-executor.2 Not tainted 5.9.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================