INFO: task syz.7.4111:22870 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.4111      state:D stack:26736 pid:22870 tgid:22867 ppid:9104   task_flags:0x400040 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x5fd/0x8f0
 down_read+0x98/0x2e0
 super_lock+0x2a9/0x3b0
 __iterate_supers+0x126/0x290
 ksys_sync+0x94/0x150
 __ia32_sys_sync+0xe/0x20
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3701b8ec29
RSP: 002b:00007f3702a5e038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f3701dd6180 RCX: 00007f3701b8ec29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f3701dd6180 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3701dd6218 R14: 00007f3701dd6180 R15: 00007fff7c9efde8
 </TASK>

Showing all locks held in the system:
1 lock held by pool_workqueue_/3:
 #0: ffffffff8e13fb78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730
1 lock held by khungtaskd/34:
 #0: ffffffff8e13a0e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
1 lock held by kcompactd0/38:
2 locks held by getty/5680:
 #0: ffff8880200cd0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900029032f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
3 locks held by syz-executor/17759:
1 lock held by syz.7.4111/22870:
 #0: ffff888115b100e0 (&type->s_umount_key#61){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
2 locks held by syz.9.4437/24773:
7 locks held by syz.9.4439/24775:
2 locks held by syz.2.4438/24798:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 nmi_cpu_backtrace+0x39e/0x3d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xf93/0xfe0
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 38 Comm: kcompactd0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:do_raw_spin_trylock+0x80/0x180
Code: f1 f1 04 f3 f3 f3 4b 89 04 3c be 04 00 00 00 e8 d6 28 85 00 48 89 d8 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 c4 00 00 00 8b 03 <89> 44 24 20 85 c0 0f 85 b2 00 00 00 4c 8d 74 24 20 48 89 df be 04
RSP: 0018:ffffc900006cee40 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88804b03fd00 RCX: ffffffff819e049a
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88804b03fd00
RBP: ffffc900006ceec0 R08: ffff88804b03fd03 R09: 1ffff11009607fa0
R10: dffffc0000000000 R11: ffffed1009607fa1 R12: 1ffff920000d9dc8
R13: ffff88804b03fd00 R14: ffff88804b03fd00 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000084 CR3: 00000001124d8000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 _raw_spin_trylock+0x21/0x80
 __free_frozen_pages+0x65e/0xd30
 __folio_put+0x21b/0x2c0
 migrate_pages_batch+0x227f/0x35c0
 migrate_pages+0x1bcc/0x2930
 compact_zone+0x23e1/0x4ab0
 compact_node+0x1d2/0x280
 kcompactd+0xbc8/0x1290
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
