================================================================== BUG: KCSAN: data-race in generic_write_end / mpage_process_page_bufs write to 0xffff8881205462a8 of 8 bytes by task 15186 on cpu 1: i_size_write include/linux/fs.h:913 [inline] generic_write_end+0x96/0x180 fs/buffer.c:2186 ext4_da_write_end+0x4de/0x630 fs/ext4/inode.c:3059 generic_perform_write+0x261/0x400 mm/filemap.c:3767 ext4_buffered_write_iter+0x25b/0x380 fs/ext4/file.c:269 ext4_file_write_iter+0x2e7/0x1200 call_write_iter include/linux/fs.h:2162 [inline] do_iter_readv_writev+0x2de/0x380 fs/read_write.c:725 do_iter_write+0x192/0x5c0 fs/read_write.c:851 vfs_iter_write+0x4c/0x70 fs/read_write.c:892 iter_file_splice_write+0x43a/0x790 fs/splice.c:689 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0x80/0xa0 fs/splice.c:936 splice_direct_to_actor+0x345/0x650 fs/splice.c:891 do_splice_direct+0x106/0x190 fs/splice.c:979 do_sendfile+0x675/0xc40 fs/read_write.c:1245 __do_sys_sendfile64 fs/read_write.c:1310 [inline] __se_sys_sendfile64 fs/read_write.c:1296 [inline] __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1296 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff8881205462a8 of 8 bytes by task 15184 on cpu 0: i_size_read include/linux/fs.h:891 [inline] mpage_process_page_bufs+0x34/0x560 fs/ext4/inode.c:2187 mpage_prepare_extent_to_map+0x4f6/0x650 fs/ext4/inode.c:2621 ext4_writepages+0xa78/0x1e80 fs/ext4/inode.c:2793 do_writepages+0x1cb/0x330 mm/page-writeback.c:2364 filemap_fdatawrite_wbc mm/filemap.c:407 [inline] __filemap_fdatawrite_range mm/filemap.c:440 [inline] __filemap_fdatawrite mm/filemap.c:446 [inline] filemap_flush+0xd7/0x100 mm/filemap.c:473 ext4_alloc_da_blocks+0x47/0x100 fs/ext4/inode.c:3103 ext4_release_file+0x5b/0x1d0 fs/ext4/file.c:141 __fput+0x295/0x520 fs/file_table.c:280 ____fput+0x11/0x20 fs/file_table.c:313 task_work_run+0x8e/0x110 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x160/0x190 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:300 do_syscall_64+0x50/0xd0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x000000000438c001 -> 0x000000000438d000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 15184 Comm: syz-executor.0 Not tainted 5.16.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== ================================================================== BUG: KCSAN: data-race in xas_clear_mark / xas_find_marked read-write to 0xffff8881207e9228 of 8 bytes by task 43 on cpu 1: instrument_read_write include/linux/instrumented.h:57 [inline] __instrument_read_write_bitop include/asm-generic/bitops/instrumented-non-atomic.h:81 [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+0x8f/0x170 lib/xarray.c:911 __folio_start_writeback+0x30e/0x490 mm/page-writeback.c:2886 set_page_writeback+0x39/0x50 mm/folio-compat.c:77 ext4_bio_write_page+0x132/0xaa0 fs/ext4/page-io.c:455 mpage_submit_page fs/ext4/inode.c:2095 [inline] mpage_map_and_submit_buffers fs/ext4/inode.c:2343 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2482 [inline] ext4_writepages+0x10fe/0x1e80 fs/ext4/inode.c:2795 do_writepages+0x1cb/0x330 mm/page-writeback.c:2364 __writeback_single_inode+0x80/0x4d0 fs/fs-writeback.c:1616 writeback_sb_inodes+0x677/0xdf0 fs/fs-writeback.c:1881 wb_writeback+0x26b/0x650 fs/fs-writeback.c:2054 wb_do_writeback+0x101/0x560 fs/fs-writeback.c:2197 wb_workfn+0xc8/0x440 fs/fs-writeback.c:2238 process_one_work+0x3fc/0x980 kernel/workqueue.c:2298 worker_thread+0x616/0xa70 kernel/workqueue.c:2445 kthread+0x2c7/0x2e0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 read to 0xffff8881207e9228 of 8 bytes by task 15184 on cpu 0: xas_find_chunk include/linux/xarray.h:1662 [inline] xas_find_marked+0x195/0x5f0 lib/xarray.c:1349 find_get_entry mm/filemap.c:1991 [inline] find_get_pages_range_tag+0x102/0x3a0 mm/filemap.c:2281 pagevec_lookup_range_tag+0x37/0x50 mm/swap.c:1133 mpage_prepare_extent_to_map+0x1a3/0x650 fs/ext4/inode.c:2572 ext4_writepages+0xa78/0x1e80 fs/ext4/inode.c:2793 do_writepages+0x1cb/0x330 mm/page-writeback.c:2364 filemap_fdatawrite_wbc mm/filemap.c:407 [inline] __filemap_fdatawrite_range mm/filemap.c:440 [inline] __filemap_fdatawrite mm/filemap.c:446 [inline] filemap_flush+0xd7/0x100 mm/filemap.c:473 ext4_alloc_da_blocks+0x47/0x100 fs/ext4/inode.c:3103 ext4_release_file+0x5b/0x1d0 fs/ext4/file.c:141 __fput+0x295/0x520 fs/file_table.c:280 ____fput+0x11/0x20 fs/file_table.c:313 task_work_run+0x8e/0x110 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x160/0x190 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:300 do_syscall_64+0x50/0xd0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0xffffffe000000000 -> 0xffffff0000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 15184 Comm: syz-executor.0 Not tainted 5.16.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================