================================================================== BUG: KCSAN: data-race in __blk_mq_sched_dispatch_requests / blk_mq_request_bypass_insert write to 0xffff888101ff1c10 of 8 bytes by task 39 on cpu 0: __list_add include/linux/list.h:72 [inline] list_add include/linux/list.h:88 [inline] blk_mq_request_bypass_insert+0x6a/0x130 block/blk-mq.c:2164 blk_mq_sched_insert_request+0xfd/0x220 block/blk-mq-sched.c:460 blk_mq_requeue_work+0x37b/0x3e0 block/blk-mq.c:1118 process_one_work+0x3fc/0x980 kernel/workqueue.c:2298 worker_thread+0x616/0xa70 kernel/workqueue.c:2445 kthread+0x2c7/0x2e0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 read to 0xffff888101ff1c10 of 8 bytes by task 2865 on cpu 1: list_empty_careful include/linux/list.h:321 [inline] __blk_mq_sched_dispatch_requests+0x80/0x270 block/blk-mq-sched.c:303 blk_mq_sched_dispatch_requests+0x9f/0x110 block/blk-mq-sched.c:358 __blk_mq_run_hw_queue+0xc1/0x140 block/blk-mq.c:1785 __blk_mq_delay_run_hw_queue+0x199/0x360 block/blk-mq.c:1862 blk_mq_run_hw_queue+0x231/0x260 block/blk-mq.c:1915 blk_mq_sched_insert_requests+0x130/0x200 block/blk-mq-sched.c:511 blk_mq_flush_plug_list+0x372/0x460 block/blk-mq.c:2292 blk_flush_plug+0x25a/0x2b0 block/blk-core.c:1593 blk_finish_plug+0x44/0x60 block/blk-core.c:1617 read_pages+0x34b/0x5f0 mm/readahead.c:149 page_cache_ra_unbounded+0x3d2/0x430 mm/readahead.c:238 ondemand_readahead+0x4f8/0x700 page_cache_sync_ra+0xaf/0xe0 mm/readahead.c:579 page_cache_sync_readahead include/linux/pagemap.h:1029 [inline] filemap_get_pages mm/filemap.c:2556 [inline] filemap_read+0x3eb/0x16d0 mm/filemap.c:2642 generic_file_read_iter+0x72/0x2a0 mm/filemap.c:2792 ext4_file_read_iter+0x1db/0x290 call_read_iter include/linux/fs.h:2156 [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+0x675/0xc40 fs/read_write.c:1245 __do_sys_sendfile64 fs/read_write.c:1310 [inline] __se_sys_sendfile64 fs/read_write.c:1296 [inline] __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1296 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0xffff888101ff1c08 -> 0xffff888101fdf448 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 2865 Comm: syz-executor.2 Not tainted 5.16.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================