================================================================== BUG: KCSAN: data-race in wbt_inflight_cb / wbt_wait write to 0xffff88812a81b840 of 8 bytes by task 7309 on cpu 1: wb_timestamp block/blk-wbt.c:89 [inline] wb_timestamp block/blk-wbt.c:83 [inline] wbt_wait+0x230/0x260 block/blk-wbt.c:587 __rq_qos_throttle+0x47/0x70 block/blk-rq-qos.c:72 rq_qos_throttle block/blk-rq-qos.h:182 [inline] blk_mq_make_request+0x29c/0xf60 block/blk-mq.c:1984 generic_make_request block/blk-core.c:1069 [inline] generic_make_request+0x196/0x700 block/blk-core.c:1011 submit_bio+0x96/0x3b0 block/blk-core.c:1195 mpage_bio_submit fs/mpage.c:66 [inline] mpage_readpages+0x36a/0x3c0 fs/mpage.c:410 blkdev_readpages+0x36/0x50 fs/block_dev.c:620 read_pages+0xa2/0x2d0 mm/readahead.c:126 __do_page_cache_readahead+0x353/0x390 mm/readahead.c:212 force_page_cache_readahead+0x13a/0x1f0 mm/readahead.c:243 page_cache_sync_readahead+0x1cf/0x1e0 mm/readahead.c:522 generic_file_buffered_read mm/filemap.c:2029 [inline] generic_file_read_iter+0xeb6/0x1440 mm/filemap.c:2302 blkdev_read_iter+0xb2/0xe0 fs/block_dev.c:2039 call_read_iter include/linux/fs.h:1895 [inline] new_sync_read+0x389/0x4f0 fs/read_write.c:414 __vfs_read+0xb1/0xc0 fs/read_write.c:427 vfs_read fs/read_write.c:461 [inline] vfs_read+0x143/0x2c0 fs/read_write.c:446 ksys_read+0xd5/0x1b0 fs/read_write.c:587 __do_sys_read fs/read_write.c:597 [inline] __se_sys_read fs/read_write.c:595 [inline] __x64_sys_read+0x4c/0x60 fs/read_write.c:595 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88812a81b840 of 8 bytes by task 7313 on cpu 0: get_limit block/blk-wbt.c:482 [inline] wbt_inflight_cb+0x1bb/0x230 block/blk-wbt.c:503 rq_qos_wait+0x283/0x320 block/blk-rq-qos.c:266 __wbt_wait block/blk-wbt.c:526 [inline] wbt_wait+0x161/0x260 block/blk-wbt.c:591 __rq_qos_throttle+0x47/0x70 block/blk-rq-qos.c:72 rq_qos_throttle block/blk-rq-qos.h:182 [inline] blk_mq_make_request+0x29c/0xf60 block/blk-mq.c:1984 generic_make_request block/blk-core.c:1069 [inline] generic_make_request+0x196/0x700 block/blk-core.c:1011 submit_bio+0x96/0x3b0 block/blk-core.c:1195 submit_bh_wbc+0x418/0x470 fs/buffer.c:3112 submit_bh fs/buffer.c:3118 [inline] write_dirty_buffer fs/buffer.c:3186 [inline] write_dirty_buffer+0x83/0x100 fs/buffer.c:3177 fat_sync_bhs+0x59/0x14b fs/fat/misc.c:357 fat_alloc_clusters+0xae6/0xc40 fs/fat/fatent.c:539 fat_add_cluster+0x3d/0xd0 fs/fat/inode.c:108 fat_fallocate+0x152/0x1f0 fs/fat/file.c:291 vfs_fallocate+0x3be/0x650 fs/open.c:309 ioctl_preallocate+0x12b/0x190 fs/ioctl.c:504 file_ioctl fs/ioctl.c:544 [inline] do_vfs_ioctl+0xa73/0xd00 fs/ioctl.c:742 ksys_ioctl+0xbd/0x150 fs/ioctl.c:761 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x4c/0x60 fs/ioctl.c:770 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 7313 Comm: syz-executor.1 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================