INFO: task syz.1.935:7102 blocked for more than 430 seconds.
      Not tainted 6.13.0-rc2-syzkaller-g21f1b85c8912 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.935       state:D stack:0     pid:7102  tgid:7102  ppid:3167   flags:0x00000008
Call Trace:
[<ffffffff861cbf70>] context_switch kernel/sched/core.c:5369 [inline]
[<ffffffff861cbf70>] __schedule+0xdaa/0x393a kernel/sched/core.c:6756
[<ffffffff861cebc4>] __schedule_loop kernel/sched/core.c:6833 [inline]
[<ffffffff861cebc4>] schedule+0xc4/0x324 kernel/sched/core.c:6848
[<ffffffff861e2236>] schedule_timeout+0x1c6/0x28a kernel/time/sleep_timeout.c:75
[<ffffffff861d06a8>] do_wait_for_common kernel/sched/completion.c:95 [inline]
[<ffffffff861d06a8>] __wait_for_common+0x1ca/0x4b6 kernel/sched/completion.c:116
[<ffffffff861d09ae>] wait_for_common kernel/sched/completion.c:127 [inline]
[<ffffffff861d09ae>] wait_for_completion+0x1a/0x22 kernel/sched/completion.c:148
[<ffffffff848bfc8c>] __vhost_worker_flush+0x204/0x274 drivers/vhost/vhost.c:288
[<ffffffff848bfdb0>] vhost_worker_flush drivers/vhost/vhost.c:295 [inline]
[<ffffffff848bfdb0>] vhost_dev_flush+0xb4/0x114 drivers/vhost/vhost.c:305
[<ffffffff848a8b4a>] vhost_net_flush+0x24/0x19e drivers/vhost/net.c:1359
[<ffffffff848a8fb8>] vhost_net_release+0xac/0x256 drivers/vhost/net.c:1380
[<ffffffff80ad4c7a>] __fput+0x378/0x9ee fs/file_table.c:450
[<ffffffff80ad5396>] ____fput+0x1c/0x26 fs/file_table.c:478
[<ffffffff801c1c92>] task_work_run+0x16a/0x25e kernel/task_work.c:239
[<ffffffff861c3128>] resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
[<ffffffff861c3128>] exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
[<ffffffff861c3128>] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
[<ffffffff861c3128>] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
[<ffffffff861c3128>] syscall_exit_to_user_mode+0x302/0x316 kernel/entry/common.c:218
[<ffffffff861c1e8a>] do_trap_ecall_u+0x86/0x216 arch/riscv/kernel/traps.c:345
[<ffffffff861e652a>] _new_vmalloc_restore_context_a0+0xc2/0xce

Showing all locks held in the system:
1 lock held by khungtaskd/36:
 #0: ffffffff881d0c40 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x68/0x2e6 kernel/locking/lockdep.c:6740
3 locks held by syslogd/2973:
2 locks held by getty/3127:
 #0: ff6000001d31f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3a/0x46 drivers/tty/tty_ldsem.c:340
 #1: ff2000000008b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0xd7c/0x129a drivers/tty/n_tty.c:2211
1 lock held by sshd/3153:
2 locks held by kworker/u10:3/7307:
2 locks held by syz.2.1038/7775:
1 lock held by syz.0.1055/7822:
1 lock held by syz.2.1057/7845:
 #0: ff6000001e7e1c10 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable include/linux/mmap_lock.h:153 [inline]
 #0: ff6000001e7e1c10 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/memory.c:6158 [inline]
 #0: ff6000001e7e1c10 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x174/0x674 mm/memory.c:6209
3 locks held by syz.2.1057/7846:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 36 Comm: khungtaskd Not tainted 6.13.0-rc2-syzkaller-g21f1b85c8912 #0
Hardware name: riscv-virtio,qemu (DT)
Call Trace:
[<ffffffff80071bae>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:130
[<ffffffff8000325c>] show_stack+0x30/0x3c arch/riscv/kernel/stacktrace.c:136
[<ffffffff8005e1f4>] __dump_stack lib/dump_stack.c:94 [inline]
[<ffffffff8005e1f4>] dump_stack_lvl+0x12e/0x1a6 lib/dump_stack.c:120
[<ffffffff8005e288>] dump_stack+0x1c/0x24 lib/dump_stack.c:129
[<ffffffff86185c28>] nmi_cpu_backtrace+0x3b0/0x3b2 lib/nmi_backtrace.c:113
[<ffffffff86185ee0>] nmi_trigger_cpumask_backtrace+0x2b6/0x458 lib/nmi_backtrace.c:62
[<ffffffff8007c972>] arch_trigger_cpumask_backtrace+0x2c/0x3e arch/riscv/kernel/smp.c:347
[<ffffffff804b88b8>] trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
[<ffffffff804b88b8>] check_hung_uninterruptible_tasks kernel/hung_task.c:234 [inline]
[<ffffffff804b88b8>] watchdog+0xcee/0x1170 kernel/hung_task.c:397
[<ffffffff801c6f2c>] kthread+0x28c/0x3a4 kernel/kthread.c:389
[<ffffffff861e6642>] ret_from_fork+0xe/0x18 arch/riscv/kernel/entry.S:326
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 7109 Comm: syz-executor Not tainted 6.13.0-rc2-syzkaller-g21f1b85c8912 #0
Hardware name: riscv-virtio,qemu (DT)
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 : ffffffff861e4106 ra : ffffffff861e4156 sp : ff2000000ccf7aa0
 gp : ffffffff899f4f80 tp : ff6000001af69a40 t0 : 5262c402f029ff44
 t1 : ffebffff03810bd4 t2 : 000000000000014c s0 : ff2000000ccf7ac0
 s1 : 0000000000000002 a0 : 0000000000000001 a1 : ffffffff8663f920
 a2 : 0000000000000002 a3 : 0000000000000001 a4 : 0000000000000001
 a5 : 0000000000000000 a6 : 0000000000000003 a7 : ff6000001c085ea3
 s2 : ff6000001c085ea0 s3 : ff2000000ccf7c00 s4 : ff6000001c085ee0
 s5 : ff6000001c085ee0 s6 : ff2000000ccf7be8 s7 : ff6000001c085ea0
 s8 : 0000000000000004 s9 : 0000000000003a98 s10: 00000000003464eb
 s11: 00000000000003e8 t3 : ff6000001af6a560 t4 : ffebffff03810bd4
 t5 : ffebffff03810bd5 t6 : 0000000000000004
status: 0000000200000120 badaddr: 0000000000000000 cause: 8000000000000001
[<ffffffff861e4106>] arch_local_irq_restore arch/riscv/include/asm/irqflags.h:51 [inline]
[<ffffffff861e4106>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
[<ffffffff861e4106>] _raw_spin_unlock_irqrestore+0x36/0xd4 kernel/locking/spinlock.c:194
[<ffffffff802829d2>] spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
[<ffffffff802829d2>] add_wait_queue+0x150/0x1d8 kernel/sched/wait.c:24
[<ffffffff80147210>] do_wait+0x16c/0x690 kernel/exit.c:1687
[<ffffffff80148f80>] kernel_wait4+0x17e/0x41a kernel/exit.c:1850
[<ffffffff80149372>] __do_sys_wait4+0x156/0x162 kernel/exit.c:1878
[<ffffffff801496f2>] __se_sys_wait4 kernel/exit.c:1874 [inline]
[<ffffffff801496f2>] __riscv_sys_wait4+0x8a/0xd6 kernel/exit.c:1874
[<ffffffff80070302>] syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:90
[<ffffffff861c1fae>] do_trap_ecall_u+0x1aa/0x216 arch/riscv/kernel/traps.c:331
[<ffffffff861e652a>] _new_vmalloc_restore_context_a0+0xc2/0xce