INFO: task syz.0.16:4859 blocked for more than 143 seconds. Not tainted 5.15.180-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.16 state:D stack: 0 pid: 4859 ppid: 4616 flags:0x00000009 Call trace: __switch_to+0x308/0x588 arch/arm64/kernel/process.c:518 context_switch kernel/sched/core.c:5030 [inline] __schedule+0xf10/0x1e48 kernel/sched/core.c:6376 schedule+0x11c/0x1c8 kernel/sched/core.c:6459 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6518 __mutex_lock_common+0xba0/0x2154 kernel/locking/mutex.c:669 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0xa4/0xf8 kernel/locking/mutex.c:743 bfs_lookup+0x11c/0x228 fs/bfs/dir.c:136 __lookup_slow+0x250/0x388 fs/namei.c:1663 lookup_slow+0x60/0x84 fs/namei.c:1680 walk_component+0x394/0x4cc fs/namei.c:1976 link_path_walk+0x5a0/0xc38 fs/namei.c:-1 path_parentat fs/namei.c:2502 [inline] __filename_parentat+0x1d4/0x5b8 fs/namei.c:2526 filename_parentat fs/namei.c:2544 [inline] filename_create+0xf0/0x468 fs/namei.c:3816 do_mkdirat+0xac/0x610 fs/namei.c:4080 __do_sys_mkdirat fs/namei.c:4105 [inline] __se_sys_mkdirat fs/namei.c:4103 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4103 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffff800014d41be0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:311 2 locks held by kworker/u4:2/148: #0: ffff0000c0029138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x66c/0x11b8 kernel/workqueue.c:2283 #1: ffff80001d7c7c00 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x6ac/0x11b8 kernel/workqueue.c:2285 2 locks held by kworker/u4:4/384: #0: ffff0001b41a7918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:475 [inline] #0: ffff0001b41a7918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1326 [inline] #0: ffff0001b41a7918 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1621 [inline] #0: ffff0001b41a7918 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x328/0x1e48 kernel/sched/core.c:6290 #1: ffff0001b4194c48 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x438/0x66c kernel/sched/psi.c:891 2 locks held by getty/3789: #0: ffff0000d418a098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x40/0x50 drivers/tty/tty_ldsem.c:340 #1: ffff80001d58b2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1204 drivers/tty/n_tty.c:2158 3 locks held by syz.0.16/4858: 2 locks held by syz.0.16/4859: #0: ffff0000e769c168 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline] #0: ffff0000e769c168 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: lookup_slow+0x50/0x84 fs/namei.c:1679 #1: ffff0000d04560d8 (&info->bfs_lock){+.+.}-{3:3}, at: bfs_lookup+0x11c/0x228 fs/bfs/dir.c:136 2 locks held by syz.1.17/4875: 2 locks held by syz.1.17/4876: #0: ffff000101454168 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline] #0: ffff000101454168 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: lookup_slow+0x50/0x84 fs/namei.c:1679 #1: ffff0000d9d294d8 (&info->bfs_lock){+.+.}-{3:3}, at: bfs_lookup+0x11c/0x228 fs/bfs/dir.c:136 4 locks held by syz.2.18/4892: 2 locks held by syz.2.18/4893: #0: ffff000101454690 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline] #0: ffff000101454690 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: lookup_slow+0x50/0x84 fs/namei.c:1679 #1: ffff0000c2e6dad8 (&info->bfs_lock){+.+.}-{3:3}, at: bfs_lookup+0x11c/0x228 fs/bfs/dir.c:136 2 locks held by syz.3.19/4910: 2 locks held by syz.3.19/4911: #0: ffff000101454bb8 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline] #0: ffff000101454bb8 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: lookup_slow+0x50/0x84 fs/namei.c:1679 #1: ffff0000d8d258d8 (&info->bfs_lock){+.+.}-{3:3}, at: bfs_lookup+0x11c/0x228 fs/bfs/dir.c:136 3 locks held by syz.4.20/4936: 2 locks held by syz.4.20/4937: #0: ffff0000e769c690 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline] #0: ffff0000e769c690 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: lookup_slow+0x50/0x84 fs/namei.c:1679 #1: ffff0000c1084ed8 (&info->bfs_lock){+.+.}-{3:3}, at: bfs_lookup+0x11c/0x228 fs/bfs/dir.c:136 2 locks held by syz.5.21/4963: 2 locks held by syz.5.21/4964: #0: ffff0001014550e0 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline] #0: ffff0001014550e0 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: lookup_slow+0x50/0x84 fs/namei.c:1679 #1: ffff0000eae032d8 (&info->bfs_lock){+.+.}-{3:3}, at: bfs_lookup+0x11c/0x228 fs/bfs/dir.c:136 2 locks held by syz.6.22/4997: 2 locks held by syz.6.22/4998: #0: ffff000101455608 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline] #0: ffff000101455608 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: lookup_slow+0x50/0x84 fs/namei.c:1679 #1: ffff0000d6a1f6d8 (&info->bfs_lock){+.+.}-{3:3}, at: bfs_lookup+0x11c/0x228 fs/bfs/dir.c:136 2 locks held by syz.7.23/5024: 2 locks held by syz.7.23/5025: #0: ffff000101455b30 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline] #0: ffff000101455b30 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: lookup_slow+0x50/0x84 fs/namei.c:1679 #1: ffff0000d79666d8 (&info->bfs_lock){+.+.}-{3:3}, at: bfs_lookup+0x11c/0x228 fs/bfs/dir.c:136 1 lock held by syz-executor/5027: #0: ffff800016cb6a28 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffff800016cb6a28 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa34/0xdb4 net/core/rtnetlink.c:5647 =============================================