================================================================== BUG: KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue write to 0xffff8881026b9810 of 8 bytes by task 154 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/0x140 block/blk-mq.c:2366 blk_mq_sched_insert_request+0xfd/0x220 block/blk-mq-sched.c:441 blk_mq_requeue_work+0x237/0x400 block/blk-mq.c:1313 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289 worker_thread+0x618/0xa70 kernel/workqueue.c:2436 kthread+0x1a9/0x1e0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 read to 0xffff8881026b9810 of 8 bytes by task 13224 on cpu 0: list_empty_careful include/linux/list.h:329 [inline] blk_mq_hctx_has_pending block/blk-mq.c:101 [inline] blk_mq_run_hw_queue+0x19b/0x310 block/blk-mq.c:2104 blk_mq_sched_insert_requests+0x1cb/0x2a0 block/blk-mq-sched.c:493 blk_mq_dispatch_plug_list+0x1e9/0x2c0 block/blk-mq.c:2604 blk_mq_flush_plug_list+0x2ea/0x340 block/blk-mq.c:2646 __blk_flush_plug+0x25a/0x2b0 block/blk-core.c:1244 blk_finish_plug+0x44/0x60 block/blk-core.c:1268 __iomap_dio_rw+0xc50/0xf80 fs/iomap/direct-io.c:599 iomap_dio_rw+0x38/0x80 fs/iomap/direct-io.c:681 ext4_dio_write_iter fs/ext4/file.c:566 [inline] ext4_file_write_iter+0x7df/0xdf0 fs/ext4/file.c:677 do_iter_readv_writev+0x27b/0x300 do_iter_write+0x16f/0x5c0 fs/read_write.c:852 vfs_iter_write+0x4c/0x70 fs/read_write.c:893 iter_file_splice_write+0x44a/0x7c0 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+0x345/0x660 fs/splice.c:891 do_splice_direct+0xfb/0x180 fs/splice.c:979 do_sendfile+0x3ad/0x900 fs/read_write.c:1246 __do_sys_sendfile64 fs/read_write.c:1311 [inline] __se_sys_sendfile64 fs/read_write.c:1297 [inline] __x64_sys_sendfile64+0x10c/0x150 fs/read_write.c:1297 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0xffff8881026b9808 -> 0xffff8881031e20c8 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 13224 Comm: syz-executor.4 Not tainted 5.18.0-rc3-syzkaller-00218-g13bc32bad705-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================