================================================================== BUG: KCSAN: data-race in wbt_wait / wbt_wait write to 0xffff888103abcd40 of 8 bytes by task 10888 on cpu 0: wb_timestamp block/blk-wbt.c:89 [inline] wbt_wait+0x12b/0x2b0 block/blk-wbt.c:579 __rq_qos_throttle+0x39/0x70 block/blk-rq-qos.c:72 rq_qos_throttle block/blk-rq-qos.h:182 [inline] blk_mq_submit_bio+0x240/0x1040 block/blk-mq.c:2158 __submit_bio_noacct_mq block/blk-core.c:1028 [inline] submit_bio_noacct+0x78d/0x960 block/blk-core.c:1061 submit_bio+0x200/0x360 block/blk-core.c:1131 iomap_dio_submit_bio fs/iomap/direct-io.c:76 [inline] iomap_dio_bio_actor+0x88d/0xac0 fs/iomap/direct-io.c:312 iomap_dio_actor+0x26e/0x3b0 fs/iomap/direct-io.c:387 iomap_apply+0x1e1/0x4a0 fs/iomap/apply.c:84 __iomap_dio_rw+0x448/0x9b0 fs/iomap/direct-io.c:517 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:605 ext4_dio_read_iter fs/ext4/file.c:77 [inline] ext4_file_read_iter+0x3cd/0x430 fs/ext4/file.c:129 call_read_iter include/linux/fs.h:1895 [inline] generic_file_splice_read+0x22a/0x310 fs/splice.c:311 do_splice_to fs/splice.c:788 [inline] splice_direct_to_actor+0x2aa/0x650 fs/splice.c:867 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 read to 0xffff888103abcd40 of 8 bytes by task 10872 on cpu 1: wb_timestamp block/blk-wbt.c:88 [inline] wbt_wait+0xcf/0x2b0 block/blk-wbt.c:579 __rq_qos_throttle+0x39/0x70 block/blk-rq-qos.c:72 rq_qos_throttle block/blk-rq-qos.h:182 [inline] blk_mq_submit_bio+0x240/0x1040 block/blk-mq.c:2158 __submit_bio_noacct_mq block/blk-core.c:1028 [inline] submit_bio_noacct+0x78d/0x960 block/blk-core.c:1061 submit_bio+0x200/0x360 block/blk-core.c:1131 ext4_mpage_readpages+0x1565/0x15c0 fs/ext4/readpage.c:412 ext4_readahead+0x99/0xa0 fs/ext4/inode.c:3261 read_pages+0x9c/0x6e0 mm/readahead.c:130 page_cache_ra_unbounded+0x46c/0x4c0 mm/readahead.c:238 ondemand_readahead+0x560/0x780 mm/readahead.c:267 page_cache_sync_ra+0x18f/0x1a0 mm/readahead.c:577 page_cache_sync_readahead include/linux/pagemap.h:839 [inline] generic_file_buffered_read_get_pages+0x234/0xaf0 mm/filemap.c:2365 generic_file_buffered_read+0x26e/0x9c0 mm/filemap.c:2485 generic_file_read_iter+0x82/0x3e0 mm/filemap.c:2637 ext4_file_read_iter+0x2e0/0x430 fs/ext4/file.c:74 call_read_iter include/linux/fs.h:1895 [inline] generic_file_splice_read+0x22a/0x310 fs/splice.c:311 do_splice_to fs/splice.c:788 [inline] splice_direct_to_actor+0x2aa/0x650 fs/splice.c:867 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: 1 PID: 10872 Comm: syz-executor.1 Not tainted 5.11.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================