IPVS: ftp: loaded support on port[0] = 21
==================================================================
BUG: KMSAN: uninit-value in __list_del_entry_valid+0x38a/0x440 lib/list_debug.c:54
CPU: 1 PID: 16614 Comm: loop0 Not tainted 4.17.0+ #9
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x188/0x2a0 mm/kmsan/kmsan.c:1125
 __msan_warning_32+0x70/0xc0 mm/kmsan/kmsan_instr.c:620
 __list_del_entry_valid+0x38a/0x440 lib/list_debug.c:54
 __list_del_entry include/linux/list.h:117 [inline]
 list_del_init include/linux/list.h:159 [inline]
 kthread_worker_fn+0x324/0x900 kernel/kthread.c:631
 loop_kthread_worker_fn+0x90/0xb0 drivers/block/loop.c:863
 kthread+0x4db/0x6c0 kernel/kthread.c:241
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:413

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:282 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:297 [inline]
 kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:689
 __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:464
 __write_once_size include/linux/compiler.h:224 [inline]
 __list_add include/linux/list.h:66 [inline]
 list_add_tail include/linux/list.h:93 [inline]
 kthread_insert_work kernel/kthread.c:767 [inline]
 kthread_queue_work+0x61c/0x660 kernel/kthread.c:793
 loop_queue_rq+0x1cf/0x5e0 drivers/block/loop.c:1756
 blk_mq_dispatch_rq_list+0xff9/0x24b0 block/blk-mq.c:1239
 blk_mq_do_dispatch_sched block/blk-mq-sched.c:120 [inline]
 blk_mq_sched_dispatch_requests+0xc9b/0x19c0 block/blk-mq-sched.c:221
 __blk_mq_run_hw_queue+0x3c3/0x460 block/blk-mq.c:1350
 __blk_mq_delay_run_hw_queue+0x1a5/0x760 block/blk-mq.c:1418
 blk_mq_run_hw_queue+0x428/0x5d0 block/blk-mq.c:1455
 blk_mq_sched_insert_requests+0x30a/0x340 block/blk-mq-sched.c:478
 blk_mq_flush_plug_list+0xfc9/0xfe0 block/blk-mq.c:1705
 blk_flush_plug_list+0x812/0x2110 block/blk-core.c:3689
 blk_mq_make_request+0x1e26/0x2440 block/blk-mq.c:1919
 generic_make_request+0x733/0x18f0 block/blk-core.c:2460
 submit_bio+0x2e8/0x740 block/blk-core.c:2568
 submit_bh_wbc+0xb3b/0xe00 fs/buffer.c:3081
 __block_write_full_page+0x12ea/0x1e10 fs/buffer.c:1763
 block_write_full_page+0x32c/0x440 fs/buffer.c:2949
 blkdev_writepage+0x76/0x90 fs/block_dev.c:566
 __writepage+0xc5/0x200 mm/page-writeback.c:2302
 write_cache_pages+0x123f/0x1870 mm/page-writeback.c:2240
 generic_writepages+0x10f/0x190 mm/page-writeback.c:2326
 blkdev_writepages+0x67/0x80 fs/block_dev.c:1951
 do_writepages+0x184/0x3c0 mm/page-writeback.c:2341
 __filemap_fdatawrite_range+0x4b6/0x500 mm/filemap.c:445
 __filemap_fdatawrite mm/filemap.c:453 [inline]
 filemap_fdatawrite mm/filemap.c:458 [inline]
 filemap_write_and_wait+0x25e/0x950 mm/filemap.c:617
 __sync_blockdev fs/block_dev.c:448 [inline]
 sync_blockdev fs/block_dev.c:457 [inline]
 __blkdev_put+0x2ba/0xc90 fs/block_dev.c:1783
 blkdev_put+0x435/0x570 fs/block_dev.c:1852
 blkdev_close+0xa6/0xf0 fs/block_dev.c:1859
 __fput+0x458/0xa30 fs/file_table.c:209
 ____fput+0x37/0x40 fs/file_table.c:243
 task_work_run+0x22e/0x2b0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x110e/0x3930 kernel/exit.c:867
 do_group_exit+0x1a0/0x360 kernel/exit.c:970
 get_signal+0x1405/0x1ec0 kernel/signal.c:2482
 do_signal+0xb8/0x1d20 arch/x86/kernel/signal.c:810
 exit_to_usermode_loop arch/x86/entry/common.c:162 [inline]
 prepare_exit_to_usermode+0x271/0x3a0 arch/x86/entry/common.c:196
 syscall_return_slowpath+0xe9/0x710 arch/x86/entry/common.c:265
 do_syscall_64+0x1ad/0x230 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Local variable description: ----bd@blk_mq_dispatch_rq_list
Variable was created at:
 blk_mq_dispatch_rq_list+0x96/0x24b0 block/blk-mq.c:1179
 blk_mq_do_dispatch_sched block/blk-mq-sched.c:120 [inline]
 blk_mq_sched_dispatch_requests+0xc9b/0x19c0 block/blk-mq-sched.c:221
==================================================================