================================================================== BUG: KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue write to 0xffff888102013410 of 8 bytes by task 228 on cpu 1: __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:2163 blk_mq_sched_insert_request+0xfd/0x220 block/blk-mq-sched.c:460 blk_mq_requeue_work+0x37b/0x3e0 block/blk-mq.c:1117 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 0xffff888102013410 of 8 bytes by task 17397 on cpu 0: list_empty_careful include/linux/list.h:321 [inline] blk_mq_hctx_has_pending block/blk-mq.c:99 [inline] blk_mq_run_hw_queue+0x12e/0x260 block/blk-mq.c:1910 blk_mq_sched_insert_requests+0x130/0x200 block/blk-mq-sched.c:511 blk_mq_flush_plug_list+0x372/0x460 block/blk-mq.c:2291 blk_flush_plug+0x25a/0x2b0 block/blk-core.c:1590 blk_finish_plug+0x44/0x60 block/blk-core.c:1614 __iomap_dio_rw+0xcad/0x1070 fs/iomap/direct-io.c:597 iomap_dio_rw+0x38/0x80 fs/iomap/direct-io.c:679 ext4_dio_write_iter fs/ext4/file.c:568 [inline] ext4_file_write_iter+0xa72/0x1200 fs/ext4/file.c:679 call_write_iter include/linux/fs.h:2162 [inline] do_iter_readv_writev+0x2de/0x380 fs/read_write.c:725 do_iter_write+0x192/0x5c0 fs/read_write.c:851 vfs_iter_write+0x4c/0x70 fs/read_write.c:892 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+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: 0xffff888102013408 -> 0xffff8881029a3848 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 17397 Comm: syz-executor.2 Not tainted 5.16.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================