syzbot

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BUG: KCSAN: data-race in xas_find_marked / xas_set_mark

read-write to 0xffff888129041470 of 8 bytes by task 31698 on cpu 0:
 instrument_read_write include/linux/instrumented.h:55 [inline]
 __instrument_read_write_bitop include/asm-generic/bitops/instrumented-non-atomic.h:84 [inline]
 ___test_and_set_bit include/asm-generic/bitops/instrumented-non-atomic.h:99 [inline]
 node_set_mark lib/xarray.c:95 [inline]
 xas_set_mark+0x86/0x140 lib/xarray.c:885
 __folio_start_writeback+0x233/0x4b0 mm/page-writeback.c:3011
 ext4_bio_write_folio+0x592/0x9a0 fs/ext4/page-io.c:557
 mpage_submit_folio fs/ext4/inode.c:1865 [inline]
 mpage_process_page_bufs+0x488/0x5d0 fs/ext4/inode.c:1978
 mpage_prepare_extent_to_map+0x780/0xb70 fs/ext4/inode.c:2486
 ext4_do_writepages+0x6ea/0x2100 fs/ext4/inode.c:2628
 ext4_writepages+0x15e/0x2e0 fs/ext4/inode.c:2764
 do_writepages+0x1c2/0x340 mm/page-writeback.c:2553
 filemap_fdatawrite_wbc+0xdb/0xf0 mm/filemap.c:390
 __filemap_fdatawrite_range mm/filemap.c:423 [inline]
 file_write_and_wait_range+0xf4/0x190 mm/filemap.c:781
 ext4_sync_file+0x133/0x6c0 fs/ext4/fsync.c:158
 vfs_fsync_range+0x111/0x120 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2584 [inline]
 ext4_buffered_write_iter+0x334/0x370 fs/ext4/file.c:305
 ext4_dio_write_iter fs/ext4/file.c:624 [inline]
 ext4_file_write_iter+0x103a/0x1200 fs/ext4/file.c:715
 do_iter_write+0x4b4/0x7b0 fs/read_write.c:860
 vfs_iter_write+0x56/0x70 fs/read_write.c:901
 iter_file_splice_write+0x462/0x7e0 fs/splice.c:736
 do_splice_from fs/splice.c:933 [inline]
 direct_splice_actor+0x8a/0xb0 fs/splice.c:1142
 splice_direct_to_actor+0x31d/0x690 fs/splice.c:1088
 do_splice_direct+0x10d/0x190 fs/splice.c:1194
 do_sendfile+0x3b6/0x9a0 fs/read_write.c:1254
 __do_sys_sendfile64 fs/read_write.c:1322 [inline]
 __se_sys_sendfile64 fs/read_write.c:1308 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1308
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888129041470 of 8 bytes by task 2740 on cpu 1:
 xas_find_chunk include/linux/xarray.h:1723 [inline]
 xas_find_marked+0x216/0x660 lib/xarray.c:1354
 find_get_entry+0x5d/0x290 mm/filemap.c:1978
 filemap_get_folios_tag+0x126/0x250 mm/filemap.c:2266
 __filemap_fdatawait_range+0x82/0x140 mm/filemap.c:516
 filemap_fdatawait_range_keep_errors+0x25/0x90 mm/filemap.c:574
 jbd2_journal_finish_inode_data_buffers+0x50/0x60 fs/jbd2/commit.c:244
 ext4_journal_finish_inode_data_buffers+0x45/0x60 fs/ext4/super.c:605
 journal_finish_inode_data_buffers fs/jbd2/commit.c:269 [inline]
 jbd2_journal_commit_transaction+0x16fb/0x33a0 fs/jbd2/commit.c:741
 kjournald2+0x242/0x420 fs/jbd2/journal.c:201
 kthread+0x1d7/0x210 kernel/kthread.c:388
 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

value changed: 0x003c000000000000 -> 0x0ffc000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 2740 Comm: jbd2/sda1-8 Not tainted 6.6.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
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