================================================================== BUG: KCSAN: data-race in dd_has_work / dd_insert_request write to 0xffff8881020a5698 of 8 bytes by task 3260 on cpu 1: __list_add include/linux/list.h:72 [inline] list_add_tail include/linux/list.h:102 [inline] dd_insert_request+0x415/0x550 block/mq-deadline.c:758 dd_insert_requests+0xfc/0x140 block/mq-deadline.c:777 blk_mq_sched_insert_requests+0xc0/0x2a0 block/blk-mq-sched.c:477 blk_mq_dispatch_plug_list+0x1e9/0x2c0 block/blk-mq.c:2597 blk_mq_flush_plug_list+0x2ea/0x340 block/blk-mq.c:2639 __blk_flush_plug+0x25a/0x2b0 block/blk-core.c:1240 blk_finish_plug+0x44/0x60 block/blk-core.c:1264 ext4_writepages+0x172d/0x1d00 fs/ext4/inode.c:2855 do_writepages+0x1db/0x350 mm/page-writeback.c:2352 filemap_fdatawrite_wbc+0xd6/0xf0 mm/filemap.c:388 __filemap_fdatawrite_range mm/filemap.c:421 [inline] filemap_write_and_wait_range+0xbf/0x2e0 mm/filemap.c:673 __iomap_dio_rw+0x514/0xf80 fs/iomap/direct-io.c:562 iomap_dio_rw+0x38/0x80 fs/iomap/direct-io.c:681 ext4_dio_read_iter fs/ext4/file.c:79 [inline] ext4_file_read_iter+0x22b/0x2a0 fs/ext4/file.c:130 call_read_iter include/linux/fs.h:2044 [inline] generic_file_splice_read+0x1de/0x2c0 fs/splice.c:311 do_splice_to fs/splice.c:796 [inline] splice_direct_to_actor+0x2ac/0x660 fs/splice.c:870 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 read to 0xffff8881020a5698 of 8 bytes by task 3259 on cpu 0: list_empty_careful include/linux/list.h:329 [inline] dd_has_work_for_prio block/mq-deadline.c:837 [inline] dd_has_work+0x188/0x260 block/mq-deadline.c:846 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:109 [inline] blk_mq_do_dispatch_sched+0x148/0x780 block/blk-mq-sched.c:187 __blk_mq_sched_dispatch_requests+0x1ca/0x270 blk_mq_sched_dispatch_requests+0x8f/0xf0 block/blk-mq-sched.c:339 __blk_mq_run_hw_queue+0x7e/0x100 block/blk-mq.c:1974 __blk_mq_delay_run_hw_queue+0x194/0x390 block/blk-mq.c:2051 blk_mq_run_hw_queue+0x180/0x310 block/blk-mq.c:2102 blk_mq_sched_insert_requests+0x1cb/0x2a0 block/blk-mq-sched.c:493 blk_mq_dispatch_plug_list+0x1e9/0x2c0 block/blk-mq.c:2597 blk_mq_flush_plug_list+0x2ea/0x340 block/blk-mq.c:2639 __blk_flush_plug+0x25a/0x2b0 block/blk-core.c:1240 blk_finish_plug+0x44/0x60 block/blk-core.c:1264 ext4_writepages+0x172d/0x1d00 fs/ext4/inode.c:2855 do_writepages+0x1db/0x350 mm/page-writeback.c:2352 filemap_fdatawrite_wbc+0xd6/0xf0 mm/filemap.c:388 __filemap_fdatawrite_range mm/filemap.c:421 [inline] filemap_write_and_wait_range+0xbf/0x2e0 mm/filemap.c:673 __iomap_dio_rw+0x514/0xf80 fs/iomap/direct-io.c:562 iomap_dio_rw+0x38/0x80 fs/iomap/direct-io.c:681 ext4_dio_read_iter fs/ext4/file.c:79 [inline] ext4_file_read_iter+0x22b/0x2a0 fs/ext4/file.c:130 call_read_iter include/linux/fs.h:2044 [inline] generic_file_splice_read+0x1de/0x2c0 fs/splice.c:311 do_splice_to fs/splice.c:796 [inline] splice_direct_to_actor+0x2ac/0x660 fs/splice.c:870 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: 0xffff8881020a5690 -> 0xffff8881035b1088 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 3259 Comm: syz-executor.4 Not tainted 5.18.0-rc5-syzkaller-00207-g379c72654524 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== syz-executor.4 (3259) used greatest stack depth: 10096 bytes left