================================================================== BUG: KCSAN: data-race in __xa_clear_mark / find_get_pages_range_tag write to 0xffff888141748fb0 of 8 bytes by interrupt on cpu 1: instrument_write include/linux/instrumented.h:42 [inline] __instrument_read_write_bitop include/asm-generic/bitops/instrumented-non-atomic.h:79 [inline] __test_and_clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:109 [inline] node_clear_mark lib/xarray.c:100 [inline] xas_clear_mark lib/xarray.c:911 [inline] __xa_clear_mark+0xff/0x1e0 lib/xarray.c:1916 test_clear_page_writeback+0x321/0x520 mm/page-writeback.c:2739 end_page_writeback+0xd7/0x260 mm/filemap.c:1498 ext4_finish_bio+0x429/0x480 fs/ext4/page-io.c:143 ext4_end_bio+0x1ba/0x310 fs/ext4/page-io.c:364 bio_endio+0x28d/0x350 block/bio.c:1450 req_bio_endio block/blk-core.c:264 [inline] blk_update_request+0x4f5/0xb40 block/blk-core.c:1462 blk_mq_end_request+0x22/0x50 block/blk-mq.c:564 lo_complete_rq+0xca/0x180 drivers/block/loop.c:497 blk_done_softirq+0x145/0x190 block/blk-mq.c:588 __do_softirq+0x13c/0x2c3 kernel/softirq.c:343 run_ksoftirqd+0x13/0x20 kernel/softirq.c:650 smpboot_thread_fn+0x34f/0x520 kernel/smpboot.c:165 kthread+0x20b/0x230 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 read to 0xffff888141748fb0 of 8 bytes by task 11811 on cpu 0: xas_find_chunk include/linux/xarray.h:1660 [inline] xas_next_marked include/linux/xarray.h:1691 [inline] find_get_pages_range_tag+0x35c/0x600 mm/filemap.c:2107 pagevec_lookup_range_tag+0x37/0x50 mm/swap.c:1122 __filemap_fdatawait_range+0xab/0x1b0 mm/filemap.c:519 file_write_and_wait_range+0xea/0x120 mm/filemap.c:765 ext4_sync_file+0x105/0x6e0 fs/ext4/fsync.c:151 vfs_fsync_range+0x107/0x120 fs/sync.c:200 generic_write_sync include/linux/fs.h:2737 [inline] ext4_buffered_write_iter+0x38f/0x3e0 fs/ext4/file.c:278 ext4_file_write_iter+0x47a/0x1060 fs/ext4/file.c:503 call_write_iter include/linux/fs.h:1901 [inline] do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740 do_iter_write+0x112/0x4c0 fs/read_write.c:866 vfs_iter_write+0x4c/0x70 fs/read_write.c:907 iter_file_splice_write+0x41a/0x770 fs/splice.c:686 do_splice_from fs/splice.c:764 [inline] direct_splice_actor+0x80/0xa0 fs/splice.c:933 splice_direct_to_actor+0x345/0x650 fs/splice.c:888 do_splice_direct+0xf5/0x170 fs/splice.c:976 do_sendfile+0x5e0/0xcf0 fs/read_write.c:1257 __do_sys_sendfile64 fs/read_write.c:1318 [inline] __se_sys_sendfile64 fs/read_write.c:1304 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1304 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: 11811 Comm: syz-executor.2 Not tainted 5.11.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================