================================================================== BUG: KCSAN: data-race in find_get_pages_range_tag / xas_set_mark write to 0xffff8880bb653b38 of 8 bytes by task 10487 on cpu 1: instrument_write include/linux/instrumented.h:42 [inline] __test_and_set_bit include/asm-generic/bitops/instrumented-non-atomic.h:71 [inline] node_set_mark lib/xarray.c:93 [inline] xas_set_mark+0x7f/0x130 lib/xarray.c:879 tag_pages_for_writeback+0x9d/0x290 mm/page-writeback.c:2124 ext4_writepages+0x63f/0x1ed0 fs/ext4/inode.c:2719 do_writepages+0x7b/0x150 mm/page-writeback.c:2352 __filemap_fdatawrite_range+0x19b/0x1d0 mm/filemap.c:422 file_write_and_wait_range+0x9f/0x120 mm/filemap.c:761 ext4_sync_file+0xfc/0x6e0 fs/ext4/fsync.c:151 vfs_fsync_range+0x107/0x120 fs/sync.c:200 generic_write_sync include/linux/fs.h:2747 [inline] ext4_buffered_write_iter+0x369/0x3b0 fs/ext4/file.c:276 ext4_file_write_iter+0x768/0x1060 include/linux/fs.h:784 call_write_iter include/linux/fs.h:1882 [inline] do_iter_readv_writev+0x32e/0x3d0 fs/read_write.c:721 do_iter_write+0x112/0x4b0 fs/read_write.c:1026 vfs_iter_write+0x4c/0x70 fs/read_write.c:1067 iter_file_splice_write+0x41a/0x770 fs/splice.c:770 do_splice_from fs/splice.c:866 [inline] direct_splice_actor+0x95/0x160 fs/splice.c:1036 splice_direct_to_actor+0x365/0x660 fs/splice.c:991 do_splice_direct+0xf2/0x170 fs/splice.c:1079 do_sendfile+0x56a/0xba0 fs/read_write.c:1548 __do_sys_sendfile64 fs/read_write.c:1603 [inline] __se_sys_sendfile64 fs/read_write.c:1595 [inline] __x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1595 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8880bb653b38 of 8 bytes by task 10477 on cpu 0: xas_find_chunk include/linux/xarray.h:1625 [inline] xas_next_marked include/linux/xarray.h:1656 [inline] find_get_pages_range_tag+0x30c/0x5b0 mm/filemap.c:2074 pagevec_lookup_range_tag+0x37/0x50 mm/swap.c:1122 mpage_prepare_extent_to_map+0x19c/0x650 fs/ext4/inode.c:2558 ext4_writepages+0x682/0x1ed0 fs/ext4/inode.c:2735 do_writepages+0x7b/0x150 mm/page-writeback.c:2352 __filemap_fdatawrite_range+0x19b/0x1d0 mm/filemap.c:422 file_write_and_wait_range+0x9f/0x120 mm/filemap.c:761 ext4_sync_file+0xfc/0x6e0 fs/ext4/fsync.c:151 vfs_fsync_range+0x107/0x120 fs/sync.c:200 generic_write_sync include/linux/fs.h:2747 [inline] ext4_buffered_write_iter+0x369/0x3b0 fs/ext4/file.c:276 ext4_file_write_iter+0x768/0x1060 include/linux/fs.h:784 call_write_iter include/linux/fs.h:1882 [inline] do_iter_readv_writev+0x32e/0x3d0 fs/read_write.c:721 do_iter_write+0x112/0x4b0 fs/read_write.c:1026 vfs_iter_write+0x4c/0x70 fs/read_write.c:1067 iter_file_splice_write+0x41a/0x770 fs/splice.c:770 do_splice_from fs/splice.c:866 [inline] direct_splice_actor+0x95/0x160 fs/splice.c:1036 splice_direct_to_actor+0x365/0x660 fs/splice.c:991 do_splice_direct+0xf2/0x170 fs/splice.c:1079 do_sendfile+0x56a/0xba0 fs/read_write.c:1548 __do_sys_sendfile64 fs/read_write.c:1603 [inline] __se_sys_sendfile64 fs/read_write.c:1595 [inline] __x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1595 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: 0 PID: 10477 Comm: syz-executor.2 Not tainted 5.9.0-rc8-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================