INFO: task syz.0.17:4511 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.17 state:D stack:0 pid:4511 ppid:4460 flags:0x00000001 Call trace: __switch_to+0x2f4/0x550 arch/arm64/kernel/process.c:555 context_switch kernel/sched/core.c:5245 [inline] __schedule+0xdd0/0x1b0c kernel/sched/core.c:6562 schedule+0xc4/0x170 kernel/sched/core.c:6638 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6697 rwsem_down_read_slowpath+0x4b8/0x79c kernel/locking/rwsem.c:1094 __down_read_common kernel/locking/rwsem.c:1261 [inline] __down_read kernel/locking/rwsem.c:1274 [inline] down_read+0xa8/0x300 kernel/locking/rwsem.c:1522 inode_lock_shared include/linux/fs.h:768 [inline] lookup_slow+0x4c/0x80 fs/namei.c:1714 walk_component+0x270/0x364 fs/namei.c:2006 lookup_last fs/namei.c:2463 [inline] path_lookupat+0x13c/0x3d0 fs/namei.c:2487 filename_lookup+0x1c4/0x480 fs/namei.c:2516 user_path_at_empty+0x5c/0x84 fs/namei.c:2913 user_path_at include/linux/namei.h:57 [inline] do_mount fs/namespace.c:3418 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount fs/namespace.c:3606 [inline] __arm64_sys_mount+0x464/0x59c fs/namespace.c:3606 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffff8000153f7c30 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x40/0xbb4 kernel/rcu/tasks.h:517 1 lock held by rcu_tasks_trace/13: #0: ffff8000153f8450 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x40/0xbb4 kernel/rcu/tasks.h:517 3 locks held by kworker/0:1/14: #0: ffff0000d6175938 ((wq_completion)ipv6_addrconf ){+.+.}-{0:0} , at: process_one_work+0x6b8/0x13a4 kernel/workqueue.c:2265 #1: ffff80001ca17c20 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x6fc/0x13a4 kernel/workqueue.c:2267 #2: ffff800017890988 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:74 1 lock held by khungtaskd/28: #0: ffff8000153f72c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:349 5 locks held by kworker/u4:3/1337: #0: ffff0000c0845138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x6b8/0x13a4 kernel/workqueue.c:2265 #1: ffff800024357c20 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x6fc/0x13a4 kernel/workqueue.c:2267 #2: ffff8000178840d0 (pernet_ops_rwsem ){++++}-{3:3} , at: cleanup_net+0x134/0xa84 net/core/net_namespace.c:594 #3: ffff800017890988 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:74 #4: ffff8000153fcf78 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline] #4: ffff8000153fcf78 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3fc/0x77c kernel/rcu/tree_exp.h:962 2 locks held by getty/4078: #0: ffff0000d68bc098 (&tty->ldisc_sem){++++}-{0:0} , at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff800020a0e2f0 (&ldata->atomic_read_lock ){+.+.}-{3:3} , at: n_tty_read+0x2ec/0xfa0 drivers/tty/n_tty.c:2198 1 lock held by syz.0.17/4510: 1 lock held by syz.0.17/4511: #0: ffff0000f40b0198 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:768 [inline] #0: ffff0000f40b0198 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow+0x4c/0x80 fs/namei.c:1714 1 lock held by syz.2.19/4537: 1 lock held by syz.2.19/4540: #0: ffff0000f40b0c48 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:768 [inline] #0: ffff0000f40b0c48 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow+0x4c/0x80 fs/namei.c:1714 1 lock held by syz.1.18/4539: 1 lock held by syz.1.18/4541: #0: ffff0000e5510198 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:768 [inline] #0: ffff0000e5510198 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow+0x4c/0x80 fs/namei.c:1714 1 lock held by syz.3.20/4543: 1 lock held by syz.3.20/4546: #0: ffff0000f40b16f8 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:768 [inline] #0: ffff0000f40b16f8 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow+0x4c/0x80 fs/namei.c:1714 1 lock held by syz.4.21/4545: 1 lock held by syz.4.21/4547: #0: ffff0000e5510c48 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:768 [inline] #0: ffff0000e5510c48 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow+0x4c/0x80 fs/namei.c:1714 1 lock held by syz.5.22/4571: 1 lock held by syz.5.22/4572: #0: ffff0000e55116f8 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:768 [inline] #0: ffff0000e55116f8 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow+0x4c/0x80 fs/namei.c:1714 1 lock held by syz.7.24/4669: 1 lock held by syz.7.24/4672: #0: ffff0000e55121a8 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:768 [inline] ffff0000e55121a8 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow+0x4c/0x80 fs/namei.c:1714 1 lock held by syz.6.23/4676: 1 lock held by syz.6.23/4678: #0: ffff0000f40b21a8 ( &type->i_mutex_dir_key #8 ){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:768 [inline] ){++++}-{3:3}, at: lookup_slow+0x4c/0x80 fs/namei.c:1714 1 lock held by syz.9.26/4684: 1 lock held by syz.9.26/4685: #0: ffff0000e5512c58 (&type->i_mutex_dir_key#8 ){++++}-{3:3} , at: inode_lock_shared include/linux/fs.h:768 [inline] , at: lookup_slow+0x4c/0x80 fs/namei.c:1714 4 locks held by syz.8.25/4688: 1 lock held by syz.8.25/4690: #0: ffff0000e5513708 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:768 [inline] #0: ffff0000e5513708 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow+0x4c/0x80 fs/namei.c:1714 1 lock held by syz-executor/10840: #0: ffff800017890988 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline] #0: ffff800017890988 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x650/0xcdc net/core/rtnetlink.c:6154 =============================================