syzbot

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BUG: KCSAN: data-race in dio_bio_end_io / dio_new_bio

read-write to 0xffff88812778f458 of 8 bytes by interrupt on cpu 1:
 dio_bio_end_io+0x53/0xd0 fs/direct-io.c:388
 bio_endio+0x35f/0x400 block/bio.c:1603
 req_bio_endio block/blk-mq.c:783 [inline]
 blk_update_request+0x41c/0x950 block/blk-mq.c:928
 blk_mq_end_request+0x26/0x50 block/blk-mq.c:1051
 lo_complete_rq+0xce/0x170 drivers/block/loop.c:370
 blk_complete_reqs block/blk-mq.c:1131 [inline]
 blk_done_softirq+0x73/0xa0 block/blk-mq.c:1136
 __do_softirq+0xc1/0x265 kernel/softirq.c:553
 run_ksoftirqd+0x17/0x20 kernel/softirq.c:921
 smpboot_thread_fn+0x30a/0x4a0 kernel/smpboot.c:164
 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

read to 0xffff88812778f458 of 8 bytes by task 14918 on cpu 0:
 dio_bio_reap fs/direct-io.c:549 [inline]
 dio_new_bio+0x249/0x410 fs/direct-io.c:668
 dio_send_cur_page+0x1f2/0x790 fs/direct-io.c:749
 submit_page_section+0x1a2/0x5a0 fs/direct-io.c:814
 do_direct_IO fs/direct-io.c:1029 [inline]
 __blockdev_direct_IO+0x13a3/0x1f80 fs/direct-io.c:1248
 blockdev_direct_IO include/linux/fs.h:2969 [inline]
 fat_direct_IO+0x110/0x1d0 fs/fat/inode.c:283
 generic_file_direct_write+0xab/0x1f0 mm/filemap.c:3894
 __generic_file_write_iter+0xae/0x120 mm/filemap.c:4050
 generic_file_write_iter+0x7d/0x1c0 mm/filemap.c:4090
 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

value changed: 0xffff888127d3dcc0 -> 0xffff8881395a7180

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 14918 Comm: syz-executor.2 Not tainted 6.6.0-rc6-syzkaller-00285-g9c5d00cb7b6b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
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syz-executor.2 (14918) used greatest stack depth: 10424 bytes left