INFO: task hung in unregister

Kernel	Title	Repro	Fix bisect	Count	Last	Reported	Patched	Status
linux-5.15	INFO: task hung in unregister_shrinker origin:lts-only	C	done	12	603d	764d	0/3	auto-obsoleted due to no activity on 2024/10/12 11:59
upstream	INFO: task hung in unregister_shrinker mm			1	1837d	1837d	0/28	auto-closed as invalid on 2020/08/02 17:45
upstream	INFO: task hung in unregister_shrinker (3) mm			4	1258d	1373d	0/28	closed as invalid on 2022/02/07 19:19
linux-4.19	INFO: task hung in unregister_shrinker xfs	C	error	1	852d	852d	0/1	upstream: reported C repro on 2023/01/15 08:29

INFO: task kworker/u4:12:16615 blocked for more than 143 seconds. Not tainted 5.9.0-rc8-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:12 state:D stack:24800 pid:16615 ppid: 2 flags:0x00004000 Workqueue: netns cleanup_net Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0xec9/0x2280 kernel/sched/core.c:4527 schedule+0xd0/0x2a0 kernel/sched/core.c:4602 rwsem_down_write_slowpath+0x603/0xc60 kernel/locking/rwsem.c:1235 __down_write kernel/locking/rwsem.c:1389 [inline] down_write+0x137/0x150 kernel/locking/rwsem.c:1532 unregister_shrinker+0x9b/0x2c0 mm/vmscan.c:404 nfsd_reply_cache_shutdown+0x22/0x2c0 fs/nfsd/nfscache.c:203 nfsd_exit_net+0x15f/0x490 fs/nfsd/nfsctl.c:1507 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:187 cleanup_net+0x4ea/0xa00 net/core/net_namespace.c:604 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task syz-executor.1:29095 blocked for more than 145 seconds. Not tainted 5.9.0-rc8-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:28952 pid:29095 ppid: 6885 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0xec9/0x2280 kernel/sched/core.c:4527 schedule+0xd0/0x2a0 kernel/sched/core.c:4602 rwsem_down_write_slowpath+0x603/0xc60 kernel/locking/rwsem.c:1235 __down_write kernel/locking/rwsem.c:1389 [inline] down_write+0x137/0x150 kernel/locking/rwsem.c:1532 register_shrinker_prepared+0x1e/0x180 mm/vmscan.c:375 register_shrinker+0x31/0x40 mm/vmscan.c:390 nfsd_reply_cache_init+0x1f0/0x480 fs/nfsd/nfscache.c:171 nfsd_init_net+0x20b/0x640 fs/nfsd/nfsctl.c:1477 ops_init+0xaf/0x470 net/core/net_namespace.c:152