INFO: task syz-executor.4:6599 blocked for more than 143 seconds.
      Not tainted 6.1.0-rc8-syzkaller-33330-ga5541c0811a0 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D stack:0     pid:6599  ppid:3122   flags:0x00000000
Call trace:
 __switch_to+0x180/0x298 arch/arm64/kernel/process.c:555
 context_switch kernel/sched/core.c:5209 [inline]
 __schedule+0x408/0x594 kernel/sched/core.c:6521
 schedule+0x64/0xa4 kernel/sched/core.c:6597
 rwsem_down_read_slowpath+0x228/0x444 kernel/locking/rwsem.c:1095
 __down_read_common+0x48/0x154 kernel/locking/rwsem.c:1260
 __down_read kernel/locking/rwsem.c:1269 [inline]
 down_read+0x68/0x78 kernel/locking/rwsem.c:1511
 mmap_read_lock include/linux/mmap_lock.h:117 [inline]
 exit_mm+0x4c/0x1c0 kernel/exit.c:492
 do_exit+0x264/0xcac kernel/exit.c:807
 __arm64_sys_exit_group+0x0/0x18 kernel/exit.c:950
 __do_sys_exit_group kernel/exit.c:961 [inline]
 __se_sys_exit_group kernel/exit.c:959 [inline]
 __wake_up_parent+0x0/0x40 kernel/exit.c:959
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
 el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x48/0x140 arch/arm64/kernel/syscall.c:197
 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/11:
 #0: ffff80000d4a4768 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x3c/0x450 kernel/rcu/tasks.h:507
1 lock held by rcu_tasks_trace/12:
 #0: ffff80000d4a4db8 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x3c/0x450 kernel/rcu/tasks.h:507
1 lock held by khungtaskd/27:
 #0: ffff80000d4a4640 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:303
2 locks held by getty/2756:
 #0: ffff0000c7896098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x28/0x58 drivers/tty/tty_ldisc.c:244
 #1: ffff80000f6be2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x19c/0x89c drivers/tty/n_tty.c:2177
2 locks held by kworker/u4:6/3204:
1 lock held by syz-executor.4/6599:
 #0: ffff0000c9b2e608 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:117 [inline]
 #0: ffff0000c9b2e608 (&mm->mmap_lock){++++}-{3:3}, at: exit_mm+0x4c/0x1c0 kernel/exit.c:492
1 lock held by syz-executor.4/6600:
1 lock held by syz-executor.1/6708:
 #0: ffff000115246b48 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:117 [inline]
 #0: ffff000115246b48 (&mm->mmap_lock){++++}-{3:3}, at: do_page_fault+0x3c8/0x79c arch/arm64/mm/fault.c:593
1 lock held by syz-executor.1/6713:
1 lock held by syz-executor.1/6825:
 #0: ffff0000c9b2e0c8 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:117 [inline]
 #0: ffff0000c9b2e0c8 (&mm->mmap_lock){++++}-{3:3}, at: do_page_fault+0x3c8/0x79c arch/arm64/mm/fault.c:593
1 lock held by syz-executor.1/6826:

=============================================