================================================================== BUG: KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list read to 0xffff88810267cd68 of 8 bytes by task 4594 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_read_iter fs/ext4/file.c:77 [inline] ext4_file_read_iter+0x21a/0x290 fs/ext4/file.c:128 call_read_iter include/linux/fs.h:2157 [inline] generic_file_splice_read+0x24f/0x330 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+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 0xffff88810267cd68 of 8 bytes by task 4592 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 __iomap_dio_rw+0xca7/0x1010 fs/iomap/direct-io.c:570 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:649 ext4_dio_read_iter fs/ext4/file.c:77 [inline] ext4_file_read_iter+0x21a/0x290 fs/ext4/file.c:128 call_read_iter include/linux/fs.h:2157 [inline] generic_file_splice_read+0x24f/0x330 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+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 value changed: 0x000000000000360f -> 0x0000000000003610 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 4592 Comm: syz-executor.4 Not tainted 5.15.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== syz-executor.4 (4592) used greatest stack depth: 10848 bytes left