================================================================== BUG: KCSAN: data-race in wbt_wait / wbt_wait write to 0xffff888103999f40 of 8 bytes by task 15592 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+0x253/0x1060 block/blk-mq.c:2185 __submit_bio_noacct_mq block/blk-core.c:1014 [inline] submit_bio_noacct+0x7c2/0x9a0 block/blk-core.c:1047 submit_bio+0x200/0x370 block/blk-core.c:1118 ext4_mpage_readpages+0x1278/0x1550 fs/ext4/readpage.c:366 ext4_readahead+0x99/0xa0 fs/ext4/inode.c:3262 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:840 [inline] filemap_get_pages+0x1ba/0x660 mm/filemap.c:2375 filemap_read+0x1ba/0x7b0 mm/filemap.c:2458 generic_file_read_iter+0x82/0x410 mm/filemap.c:2609 ext4_file_read_iter+0x2e0/0x420 fs/ext4/file.c:74 call_read_iter include/linux/fs.h:1971 [inline] generic_file_splice_read+0x22a/0x310 fs/splice.c:311 do_splice_to fs/splice.c:796 [inline] splice_direct_to_actor+0x2aa/0x650 fs/splice.c:870 do_splice_direct+0xf5/0x170 fs/splice.c:979 do_sendfile+0x7a6/0xe20 fs/read_write.c:1260 __do_sys_sendfile64 fs/read_write.c:1325 [inline] __se_sys_sendfile64 fs/read_write.c:1311 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888103999f40 of 8 bytes by task 15570 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+0x253/0x1060 block/blk-mq.c:2185 __submit_bio_noacct_mq block/blk-core.c:1014 [inline] submit_bio_noacct+0x7c2/0x9a0 block/blk-core.c:1047 submit_bio+0x200/0x370 block/blk-core.c:1118 ext4_mpage_readpages+0x14f6/0x1550 fs/ext4/readpage.c:411 ext4_readahead+0x99/0xa0 fs/ext4/inode.c:3262 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:840 [inline] filemap_get_pages+0x1ba/0x660 mm/filemap.c:2375 filemap_read+0x1ba/0x7b0 mm/filemap.c:2458 generic_file_read_iter+0x82/0x410 mm/filemap.c:2609 ext4_file_read_iter+0x2e0/0x420 fs/ext4/file.c:74 call_read_iter include/linux/fs.h:1971 [inline] generic_file_splice_read+0x22a/0x310 fs/splice.c:311 do_splice_to fs/splice.c:796 [inline] splice_direct_to_actor+0x2aa/0x650 fs/splice.c:870 do_splice_direct+0xf5/0x170 fs/splice.c:979 do_sendfile+0x7a6/0xe20 fs/read_write.c:1260 __do_sys_sendfile64 fs/read_write.c:1325 [inline] __se_sys_sendfile64 fs/read_write.c:1311 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 15570 Comm: syz-executor.0 Not tainted 5.12.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================