================================================================== BUG: KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list read to 0xffff888101c03d68 of 8 bytes by task 1682 on cpu 1: blk_mq_dispatch_rq_list+0xac8/0x1080 block/blk-mq.c:1393 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:201 [inline] blk_mq_do_dispatch_sched+0x3b5/0x640 block/blk-mq-sched.c:214 __blk_mq_sched_dispatch_requests+0x1eb/0x290 blk_mq_sched_dispatch_requests+0x9f/0x110 block/blk-mq-sched.c:360 __blk_mq_run_hw_queue+0xbc/0x140 block/blk-mq.c:1487 __blk_mq_delay_run_hw_queue+0x163/0x2f0 block/blk-mq.c:1564 blk_mq_run_hw_queue+0x22c/0x250 block/blk-mq.c:1617 blk_mq_sched_insert_requests+0x12b/0x1f0 block/blk-mq-sched.c:513 blk_mq_flush_plug_list+0x302/0x3d0 block/blk-mq.c:1942 blk_flush_plug_list+0x235/0x260 block/blk-core.c:1726 blk_finish_plug+0x44/0x60 block/blk-core.c:1743 __iomap_dio_rw+0xca7/0x1010 fs/iomap/direct-io.c:570 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:649 ext4_dio_write_iter fs/ext4/file.c:568 [inline] ext4_file_write_iter+0xaa9/0x11f0 fs/ext4/file.c:678 call_write_iter include/linux/fs.h:2163 [inline] do_iter_readv_writev+0x2de/0x380 fs/read_write.c:729 do_iter_write+0x192/0x5c0 fs/read_write.c:855 vfs_iter_write+0x4c/0x70 fs/read_write.c:896 iter_file_splice_write+0x43a/0x790 fs/splice.c:689 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0x80/0xa0 fs/splice.c:936 splice_direct_to_actor+0x345/0x650 fs/splice.c:891 do_splice_direct+0x106/0x190 fs/splice.c:979 do_sendfile+0x63e/0xbb0 fs/read_write.c:1249 __do_sys_sendfile64 fs/read_write.c:1314 [inline] __se_sys_sendfile64 fs/read_write.c:1300 [inline] __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1300 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae write to 0xffff888101c03d68 of 8 bytes by task 1702 on cpu 0: blk_mq_dispatch_rq_list+0xadb/0x1080 block/blk-mq.c:1393 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:201 [inline] blk_mq_do_dispatch_sched+0x3b5/0x640 block/blk-mq-sched.c:214 __blk_mq_sched_dispatch_requests+0x1eb/0x290 blk_mq_sched_dispatch_requests+0x9f/0x110 block/blk-mq-sched.c:360 __blk_mq_run_hw_queue+0xbc/0x140 block/blk-mq.c:1487 __blk_mq_delay_run_hw_queue+0x163/0x2f0 block/blk-mq.c:1564 blk_mq_run_hw_queue+0x22c/0x250 block/blk-mq.c:1617 blk_mq_sched_insert_requests+0x12b/0x1f0 block/blk-mq-sched.c:513 blk_mq_flush_plug_list+0x302/0x3d0 block/blk-mq.c:1942 blk_flush_plug_list+0x235/0x260 block/blk-core.c:1726 blk_finish_plug+0x44/0x60 block/blk-core.c:1743 read_pages+0x2e9/0x540 mm/readahead.c:150 page_cache_ra_unbounded+0x3d2/0x430 mm/readahead.c:239 ondemand_readahead+0x58c/0x7c0 page_cache_async_ra+0x17e/0x1a0 mm/readahead.c:609 page_cache_async_readahead include/linux/pagemap.h:906 [inline] filemap_readahead mm/filemap.c:2520 [inline] filemap_get_pages mm/filemap.c:2561 [inline] filemap_read+0x4c0/0x1220 mm/filemap.c:2628 generic_file_read_iter+0x75/0x2c0 mm/filemap.c:2779 ext4_file_read_iter+0x1db/0x290 call_read_iter include/linux/fs.h:2157 [inline] new_sync_read fs/read_write.c:404 [inline] vfs_read+0x66c/0x750 fs/read_write.c:485 ksys_read+0xd9/0x190 fs/read_write.c:623 __do_sys_read fs/read_write.c:633 [inline] __se_sys_read fs/read_write.c:631 [inline] __x64_sys_read+0x3e/0x50 fs/read_write.c:631 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x00000000000119ec -> 0x00000000000119ed Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 1702 Comm: syz-executor.0 Not tainted 5.15.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================