================================================================== BUG: KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list write to 0xffff888101b57968 of 8 bytes by task 8289 on cpu 1: blk_mq_dispatch_rq_list+0xaca/0x1070 block/blk-mq.c:1397 __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:1492 __blk_mq_delay_run_hw_queue+0x163/0x2f0 block/blk-mq.c:1569 blk_mq_run_hw_queue+0x22c/0x250 block/blk-mq.c:1622 blk_mq_sched_insert_requests+0x12b/0x1f0 block/blk-mq-sched.c:513 blk_mq_flush_plug_list+0x302/0x3d0 block/blk-mq.c:1947 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_sync_ra+0xaf/0xe0 mm/readahead.c:580 page_cache_sync_readahead include/linux/pagemap.h:883 [inline] filemap_get_pages mm/filemap.c:2545 [inline] filemap_read+0x3ad/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] 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 read to 0xffff888101b57968 of 8 bytes by task 8293 on cpu 0: blk_mq_dispatch_rq_list+0xab7/0x1070 block/blk-mq.c:1397 __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:1492 __blk_mq_delay_run_hw_queue+0x163/0x2f0 block/blk-mq.c:1569 blk_mq_run_hw_queue+0x22c/0x250 block/blk-mq.c:1622 blk_mq_sched_insert_requests+0x12b/0x1f0 block/blk-mq-sched.c:513 blk_mq_flush_plug_list+0x302/0x3d0 block/blk-mq.c:1947 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_sync_ra+0xaf/0xe0 mm/readahead.c:580 page_cache_sync_readahead include/linux/pagemap.h:883 [inline] filemap_get_pages mm/filemap.c:2545 [inline] filemap_read+0x3ad/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] 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: 0x0000000000001745 -> 0x0000000000001746 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 8293 Comm: syz-executor.0 Not tainted 5.15.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================