INFO: task kworker/u4:3:254 blocked for more than 143 seconds. Not tainted 5.15.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:3 state:D stack:23512 pid: 254 ppid: 2 flags:0x00004000 Workqueue: netns cleanup_net Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 rwsem_down_write_slowpath+0x7b9/0x11d0 kernel/locking/rwsem.c:1107 __down_write_common kernel/locking/rwsem.c:1262 [inline] __down_write_common kernel/locking/rwsem.c:1259 [inline] __down_write kernel/locking/rwsem.c:1271 [inline] down_write+0x137/0x150 kernel/locking/rwsem.c:1518 unregister_shrinker mm/vmscan.c:678 [inline] unregister_shrinker+0x77/0x2f0 mm/vmscan.c:673 nfsd_reply_cache_shutdown+0x33/0x2d0 fs/nfsd/nfscache.c:216 nfsd_exit_net+0x10e/0x4b0 fs/nfsd/nfsctl.c:1503 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:168 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:593 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 INFO: task syz-executor.0:30599 blocked for more than 144 seconds. Not tainted 5.15.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:26592 pid:30599 ppid: 6538 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 rwsem_down_write_slowpath+0x7b9/0x11d0 kernel/locking/rwsem.c:1107 __down_write_common kernel/locking/rwsem.c:1262 [inline] __down_write_common kernel/locking/rwsem.c:1259 [inline] __down_write kernel/locking/rwsem.c:1271 [inline] down_write+0x137/0x150 kernel/locking/rwsem.c:1518 unregister_shrinker mm/vmscan.c:678 [inline] unregister_shrinker+0x77/0x2f0 mm/vmscan.c:673 nfsd_reply_cache_shutdown+0x33/0x2d0 fs/nfsd/nfscache.c:216 nfsd_exit_net+0x10e/0x4b0 fs/nfsd/nfsctl.c:1503 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:168 setup_net+0x639/0xa30 net/core/net_namespace.c:349 copy_net_ns+0x319/0x760 net/core/net_namespace.c:470 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226 ksys_unshare+0x445/0x920 kernel/fork.c:3077 __do_sys_unshare kernel/fork.c:3151 [inline] __se_sys_unshare kernel/fork.c:3149 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3149 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fc36342f8d9 RSP: 002b:00007fc3609a6188 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 00007fc363533f60 RCX: 00007fc36342f8d9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000042000000 RBP: 00007fc363489cb4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc0d15cdcf R14: 00007fc3609a6300 R15: 0000000000022000 INFO: task syz-executor.2:30663 blocked for more than 146 seconds. Not tainted 5.15.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:26704 pid:30663 ppid: 6542 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 rwsem_down_write_slowpath+0x7b9/0x11d0 kernel/locking/rwsem.c:1107 __down_write_common kernel/locking/rwsem.c:1262 [inline] __down_write_common kernel/locking/rwsem.c:1259 [inline] __down_write kernel/locking/rwsem.c:1271 [inline] down_write+0x137/0x150 kernel/locking/rwsem.c:1518 unregister_shrinker mm/vmscan.c:678 [inline] unregister_shrinker+0x77/0x2f0 mm/vmscan.c:673 nfsd_reply_cache_shutdown+0x33/0x2d0 fs/nfsd/nfscache.c:216 nfsd_exit_net+0x10e/0x4b0 fs/nfsd/nfsctl.c:1503 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:168 setup_net+0x639/0xa30 net/core/net_namespace.c:349 copy_net_ns+0x319/0x760 net/core/net_namespace.c:470 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226 ksys_unshare+0x445/0x920 kernel/fork.c:3077 __do_sys_unshare kernel/fork.c:3151 [inline] __se_sys_unshare kernel/fork.c:3149 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3149 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f94d43a48d9 RSP: 002b:00007f94d18d9188 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 00007f94d44a90e0 RCX: 00007f94d43a48d9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000042000000 RBP: 00007f94d43fecb4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc10c9807f R14: 00007f94d18d9300 R15: 0000000000022000 INFO: task syz-executor.3:30752 blocked for more than 148 seconds. Not tainted 5.15.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:26592 pid:30752 ppid: 6544 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 rwsem_down_write_slowpath+0x7b9/0x11d0 kernel/locking/rwsem.c:1107 __down_write_common kernel/locking/rwsem.c:1262 [inline] __down_write_common kernel/locking/rwsem.c:1259 [inline] __down_write kernel/locking/rwsem.c:1271 [inline] down_write+0x137/0x150 kernel/locking/rwsem.c:1518 unregister_shrinker mm/vmscan.c:678 [inline] unregister_shrinker+0x77/0x2f0 mm/vmscan.c:673 nfsd_reply_cache_shutdown+0x33/0x2d0 fs/nfsd/nfscache.c:216 nfsd_exit_net+0x10e/0x4b0 fs/nfsd/nfsctl.c:1503 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:168 setup_net+0x639/0xa30 net/core/net_namespace.c:349 copy_net_ns+0x319/0x760 net/core/net_namespace.c:470 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226 ksys_unshare+0x445/0x920 kernel/fork.c:3077 __do_sys_unshare kernel/fork.c:3151 [inline] __se_sys_unshare kernel/fork.c:3149 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3149 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f6848e058d9 RSP: 002b:00007f684635b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 00007f6848f0a020 RCX: 00007f6848e058d9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000042000000 RBP: 00007f6848e5fcb4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffeae2b005f R14: 00007f684635b300 R15: 0000000000022000 Showing all locks held in the system: 2 locks held by kworker/u4:0/8: 1 lock held by khungtaskd/26: #0: ffffffff8b980260 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 3 locks held by khugepaged/32: 4 locks held by kworker/u4:3/254: #0: ffff888015ff2138 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888015ff2138 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff888015ff2138 ((wq_completion)netns){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline] #0: ffff888015ff2138 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:634 [inline] #0: ffff888015ff2138 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline] #0: ffff888015ff2138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x8a3/0x16b0 kernel/workqueue.c:2268 #1: ffffc90001f5fdb0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x8d7/0x16b0 kernel/workqueue.c:2272 #2: ffffffff8d0d1810 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xb00 net/core/net_namespace.c:555 #3: ffffffff8ba68750 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker mm/vmscan.c:678 [inline] #3: ffffffff8ba68750 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker+0x77/0x2f0 mm/vmscan.c:673 1 lock held by systemd-udevd/2967: 1 lock held by in:imklog/6228: #0: ffff8880785efc70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 3 locks held by systemd-udevd/22692: 1 lock held by systemd-udevd/22713: 1 lock held by systemd-udevd/22752: 1 lock held by systemd-udevd/22974: 1 lock held by systemd-udevd/23091: 1 lock held by systemd-udevd/23403: 3 locks held by systemd-udevd/23404: #0: ffff88807e022460 (sb_writers#3){.+.+}-{0:0}, at: open_last_lookups fs/namei.c:3341 [inline] #0: ffff88807e022460 (sb_writers#3){.+.+}-{0:0}, at: path_openat+0x25c9/0x2740 fs/namei.c:3558 #1: ffff8880b9c31a58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:474 [inline] #1: ffff8880b9c31a58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1317 [inline] #1: ffff8880b9c31a58 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1620 [inline] #1: ffff8880b9c31a58 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x236/0x26f0 kernel/sched/core.c:6201 #2: ffff888014194230 (&p->pi_lock){-.-.}-{2:2}, at: try_to_wake_up+0xab/0x1350 kernel/sched/core.c:3981 2 locks held by syz-executor.0/30599: #0: ffffffff8d0d1810 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x2f5/0x760 net/core/net_namespace.c:466 #1: ffffffff8ba68750 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker mm/vmscan.c:678 [inline] #1: ffffffff8ba68750 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker+0x77/0x2f0 mm/vmscan.c:673 2 locks held by syz-executor.2/30663: #0: ffffffff8d0d1810 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x2f5/0x760 net/core/net_namespace.c:466 #1: ffffffff8ba68750 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker mm/vmscan.c:678 [inline] #1: ffffffff8ba68750 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker+0x77/0x2f0 mm/vmscan.c:673 2 locks held by syz-executor.3/30752: #0: ffffffff8d0d1810 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x2f5/0x760 net/core/net_namespace.c:466 #1: ffffffff8ba68750 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker mm/vmscan.c:678 [inline] #1: ffffffff8ba68750 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker+0x77/0x2f0 mm/vmscan.c:673 2 locks held by systemd-sysctl/4152: 2 locks held by systemd-sysctl/4155: 1 lock held by systemd-sysctl/4157: #0: ffff88807e804c10 (&mapping->i_mmap_rwsem){++++}-{3:3}, at: i_mmap_lock_write include/linux/fs.h:501 [inline] #0: ffff88807e804c10 (&mapping->i_mmap_rwsem){++++}-{3:3}, at: unlink_file_vma+0x7d/0x110 mm/mmap.c:169 1 lock held by systemd-sysctl/4160: #0: ffff8880b9d31a58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:474 [inline] #0: ffff8880b9d31a58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1317 [inline] #0: ffff8880b9d31a58 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1620 [inline] #0: ffff8880b9d31a58 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x236/0x26f0 kernel/sched/core.c:6201 2 locks held by grep/4166: