INFO: task syz-executor:8486 blocked for more than 430 seconds.
      Not tainted 6.16.0-rc1-syzkaller-g306e57988197 #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:0     pid:8486  tgid:8486  ppid:1      task_flags:0x40054c flags:0x0000000c
Call Trace:
[<ffffffff86307720>] context_switch kernel/sched/core.c:5396 [inline]
[<ffffffff86307720>] __schedule+0x1022/0x4094 kernel/sched/core.c:6785
[<ffffffff8630a856>] __schedule_loop kernel/sched/core.c:6863 [inline]
[<ffffffff8630a856>] schedule+0xc4/0x35e kernel/sched/core.c:6878
[<ffffffff8631edea>] schedule_timeout+0x1c6/0x2ae kernel/time/sleep_timeout.c:75
[<ffffffff8630c3de>] do_wait_for_common kernel/sched/completion.c:95 [inline]
[<ffffffff8630c3de>] __wait_for_common+0x1d2/0x3e8 kernel/sched/completion.c:116
[<ffffffff8630c60e>] wait_for_common kernel/sched/completion.c:127 [inline]
[<ffffffff8630c60e>] wait_for_completion+0x1a/0x22 kernel/sched/completion.c:148
[<ffffffff80375b84>] rcu_barrier+0x2dc/0x6cc kernel/rcu/tree.c:3850
[<ffffffff85105ec4>] netdev_run_todo+0x294/0x10b4 net/core/dev.c:11376
[<ffffffff8513609c>] rtnl_unlock+0x14/0x1c net/core/rtnetlink.c:157
[<ffffffff832f516a>] tun_detach drivers/net/tun.c:639 [inline]
[<ffffffff832f516a>] tun_chr_close+0xde/0x230 drivers/net/tun.c:3396
[<ffffffff80bfbe7a>] __fput+0x382/0xa8c fs/file_table.c:465
[<ffffffff80bfc632>] ____fput+0x1c/0x26 fs/file_table.c:493
[<ffffffff801d7c16>] task_work_run+0x16a/0x25e kernel/task_work.c:227
[<ffffffff801563ca>] exit_task_work include/linux/task_work.h:40 [inline]
[<ffffffff801563ca>] do_exit+0x844/0x28ca kernel/exit.c:955
[<ffffffff801589b0>] do_group_exit+0xd4/0x26c kernel/exit.c:1104
[<ffffffff80190b0a>] get_signal+0x207c/0x22fc kernel/signal.c:3034
[<ffffffff80070c0e>] arch_do_signal_or_restart+0x5d8/0x24c6 arch/riscv/kernel/signal.c:431
[<ffffffff803b54e6>] exit_to_user_mode_loop+0x90/0x134 kernel/entry/common.c:111
[<ffffffff862fcc8c>] exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
[<ffffffff862fcc8c>] syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
[<ffffffff862fcc8c>] syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
[<ffffffff862fcc8c>] do_trap_ecall_u+0x3f0/0x530 arch/riscv/kernel/traps.c:355
[<ffffffff863250ca>] handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197

Showing all locks held in the system:
1 lock held by khungtaskd/37:
 #0: ffffffff883dc420 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2a/0x1a0 kernel/locking/lockdep.c:6766
1 lock held by syslogd/2987:
2 locks held by getty/3140:
 #0: ffffaf801c9870a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3a/0x46 drivers/tty/tty_ldsem.c:340
 #1: ffff8f800008b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x3e4/0x12b6 drivers/tty/n_tty.c:2222
2 locks held by syz-executor/3168:
10 locks held by kworker/u10:4/6829:
1 lock held by syz-executor/7030:
2 locks held by kworker/u10:3/7862:
 #0: ffffaf8011a89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x848/0x1f32 kernel/workqueue.c:3213
 #1: ffff8f80020e7b70 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x870/0x1f32 kernel/workqueue.c:3213
3 locks held by kworker/1:1/7890:
2 locks held by kworker/0:2/8234:
1 lock held by syz-executor/8486:
 #0: ffffffff883ec640 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x56/0x6cc kernel/rcu/tree.c:3782
2 locks held by kworker/0:3/8884:
2 locks held by kworker/0:4/8995:
3 locks held by kworker/u10:7/9400:
2 locks held by kworker/0:8/9424:
3 locks held by kworker/u10:1/9575:
3 locks held by kworker/u10:8/9971:
2 locks held by rm/9974:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted 6.16.0-rc1-syzkaller-g306e57988197 #0 PREEMPT 
Hardware name: riscv-virtio,qemu (DT)
Call Trace:
[<ffffffff80078bbe>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:132
[<ffffffff8000327a>] show_stack+0x30/0x3c arch/riscv/kernel/stacktrace.c:138
[<ffffffff8006103e>] __dump_stack lib/dump_stack.c:94 [inline]
[<ffffffff8006103e>] dump_stack_lvl+0x12e/0x1a6 lib/dump_stack.c:120
[<ffffffff800610d2>] dump_stack+0x1c/0x24 lib/dump_stack.c:129
[<ffffffff862bf364>] nmi_cpu_backtrace+0x3b0/0x3b2 lib/nmi_backtrace.c:113
[<ffffffff862bf61c>] nmi_trigger_cpumask_backtrace+0x2b6/0x458 lib/nmi_backtrace.c:62
[<ffffffff800863dc>] arch_trigger_cpumask_backtrace+0x2c/0x3c arch/riscv/kernel/smp.c:350
[<ffffffff804edb80>] trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
[<ffffffff804edb80>] check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline]
[<ffffffff804edb80>] watchdog+0xcf2/0x11de kernel/hung_task.c:470
[<ffffffff801ddcbc>] kthread+0x39c/0x7d4 kernel/kthread.c:464
[<ffffffff8006977a>] ret_from_fork_kernel+0x2a/0xbb2 arch/riscv/kernel/process.c:214
[<ffffffff863251ea>] ret_from_fork_kernel_asm+0x16/0x18 arch/riscv/kernel/entry.S:327
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6829 Comm: kworker/u10:4 Not tainted 6.16.0-rc1-syzkaller-g306e57988197 #0 PREEMPT 
Hardware name: riscv-virtio,qemu (DT)
Workqueue: events_unbound nsim_dev_trap_report_work
epc : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
epc : _raw_spin_unlock_irqrestore+0x36/0xd4 kernel/locking/spinlock.c:194
 ra : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
 ra : _raw_spin_unlock_irqrestore+0x86/0xd4 kernel/locking/spinlock.c:194
epc : ffffffff86320902 ra : ffffffff86320952 sp : ffff8f8000007a60
 gp : ffffffff89c7e9c0 tp : ffffaf8012adcec0 t0 : ffff8f8000007ba0
 t1 : fffffffef21f0500 t2 : 1ffff1f000000f08 s0 : ffff8f8000007a80
 s1 : 0000000000000002 a0 : 0000000000000000 a1 : ffffffff87d6da40
 a2 : 0000000000000003 a3 : 0000000000000103 a4 : 0000000000000001
 a5 : 0000000000000000 a6 : 0000000000f00000 a7 : ffffffff90f82803
 s2 : ffffffff90f82800 s3 : dead000000000100 s4 : dead000000000122
 s5 : dfffffff00000000 s6 : ffffaf802e820a20 s7 : ffffaf802e820a00
 s8 : 0000000000000043 s9 : 0000000000000043 s10: ffffaf802e820a20
 s11: ffffaf802e820000 t3 : 29e476ff00000000 t4 : fffffffef21f0500
 t5 : fffffffef21f0501 t6 : 0000000000000002
status: 0000000200000120 badaddr: 0000000000000000 cause: 8000000000000001
[<ffffffff86320902>] arch_local_irq_restore arch/riscv/include/asm/irqflags.h:51 [inline]
[<ffffffff86320902>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
[<ffffffff86320902>] _raw_spin_unlock_irqrestore+0x36/0xd4 kernel/locking/spinlock.c:194
[<ffffffff81788d0a>] __debug_check_no_obj_freed lib/debugobjects.c:1108 [inline]
[<ffffffff81788d0a>] debug_check_no_obj_freed+0x26a/0x4fc lib/debugobjects.c:1129
[<ffffffff80a4e962>] slab_free_hook mm/slub.c:2312 [inline]
[<ffffffff80a4e962>] slab_free mm/slub.c:4643 [inline]
[<ffffffff80a4e962>] kfree+0x23e/0x4da mm/slub.c:4842
[<ffffffff80a51a3a>] slab_free_after_rcu_debug+0x9a/0x378 mm/slub.c:4680
[<ffffffff8037e76e>] rcu_do_batch kernel/rcu/tree.c:2576 [inline]
[<ffffffff8037e76e>] rcu_core+0xa24/0x1ea0 kernel/rcu/tree.c:2832
[<ffffffff8037fff8>] rcu_core_si+0xc/0x14 kernel/rcu/tree.c:2849
[<ffffffff8015e7ae>] handle_softirqs+0x4b2/0x132e kernel/softirq.c:579
[<ffffffff863252e4>] __do_softirq+0x12/0x1a kernel/softirq.c:613
[<ffffffff8006845c>] ___do_softirq+0x18/0x20 arch/riscv/kernel/irq.c:85
[<ffffffff86325232>] call_on_irq_stack+0x32/0x40 arch/riscv/kernel/entry.S:360