INFO: task syz-executor:9665 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:21416 pid:9665  tgid:9665  ppid:1      task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 io_schedule+0x80/0xd0
 folio_wait_bit_common+0x6b0/0xb90
 __filemap_get_folio+0x139/0xaf0
 truncate_inode_pages_range+0x3ed/0xda0
 evict+0x517/0x9c0
 evict_inodes+0x64c/0x6d0
 generic_shutdown_super+0x9a/0x2c0
 kill_block_super+0x44/0x90
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x425/0x4c0
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xec/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f63a1d8fed7
RSP: 002b:00007ffd7dc1dc68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f63a1e11c05 RCX: 00007f63a1d8fed7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd7dc1dd20
RBP: 00007ffd7dc1dd20 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffd7dc1edb0
R13: 00007f63a1e11c05 R14: 0000000000041022 R15: 00007ffd7dc1edf0
 </TASK>
INFO: task syz.6.1141:11289 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.1141      state:D stack:25128 pid:11289 tgid:11288 ppid:9563   task_flags:0x400140 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: 0033:0x7f11d678eba9
RSP: 002b:00007f11d7590038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f11d69d5fa0 RCX: 00007f11d678eba9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f11d69d5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f11d69d6038 R14: 00007f11d69d5fa0 R15: 00007ffe479641c8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e13a0e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5676:
 #0: ffff88801c3360a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900029062f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
2 locks held by kworker/1:4/7276:
 #0: ffff88801a480d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90002e17bc0 (free_ipc_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
1 lock held by syz-executor/9665:
 #0: ffff88801f59e0e0 (&type->s_umount_key#119){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
1 lock held by syz.6.1141/11289:
 #0: ffff88801f59e0e0 (&type->s_umount_key#119){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.9.1370/12330:
 #0: ffff88801f59e0e0 (&type->s_umount_key#119){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.0.1383/12386:
 #0: ffff88801f59e0e0 (&type->s_umount_key#119){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz-executor/12705:
1 lock held by syz.5.1713/13823:
 #0: ffff88801f59e0e0 (&type->s_umount_key#119){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.7.1755/13909:
 #0: ffff88801f59e0e0 (&type->s_umount_key#119){++++}-{4:4}, at: super_lock+0x25c/0x3b0
5 locks held by syz-executor/14318:
 #0: ffff888119f34dc0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_unregister_dev+0x212/0x510
 #1: ffff888119f340b8 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x66a/0x1330
 #2: ffffffff8f69ede8 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_hash_flush+0xa1/0x230
 #3: ffff88811d0a0338 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x70/0x680
 #4: ffffffff8e13fb78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b9/0x730
1 lock held by syz-executor/14420:
 #0: ffffffff8e13fb78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b9/0x730

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

NMI backtrace for cpu 0
CPU: 0 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 14506 Comm: dhcpcd-run-hook 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:check_preemption_disabled+0x35/0x120
Code: 48 8b 05 be 3e 26 07 48 89 44 24 08 65 8b 05 c6 3e 26 07 65 8b 0d bb 3e 26 07 f7 c1 ff ff ff 7f 74 23 65 48 8b 0d 9b 3e 26 07 <48> 3b 4c 24 08 0f 85 cc 00 00 00 48 83 c4 10 5b 41 5e 41 5f 5d e9
RSP: 0018:ffffc900063f74b8 EFLAGS: 00000002
RAX: 0000000000000001 RBX: 0000000000000202 RCX: b0e349dee79e6400
RDX: 0000000000000000 RSI: ffffffff8d9cd9ce RDI: ffffffff8be33e80
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff822e75ea
R10: dffffc0000000000 R11: fffff940008a44d1 R12: dffffc0000000000
R13: ffffffff822e75ea R14: ffffffff8e13a1a0 R15: ffff88801fc60000
FS:  0000000000000000(0000) GS:ffff8881a3c15000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff6afea018 CR3: 000000000df36000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 lock_release+0xbc/0x3e0
 pfn_valid+0x3b2/0x490
 page_table_check_clear+0x21/0x700
 unmap_page_range+0x3460/0x4370
 unmap_vmas+0x399/0x580
 exit_mmap+0x248/0xb50
 __mmput+0x118/0x430
 exit_mm+0x1da/0x2c0
 do_exit+0x648/0x2300
 do_group_exit+0x21c/0x2d0
 __x64_sys_exit_group+0x3f/0x40
 x64_sys_call+0x21f7/0x2200
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efe34639a90
Code: Unable to access opcode bytes at 0x7efe34639a66.
RSP: 002b:00007fff6afe9f88 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000055a90da68910 RCX: 00007efe34639a90
RDX: 00000000000000e7 RSI: 000000000000003c RDI: 0000000000000000
RBP: 00007fff6afea2b8 R08: 000055a90da68c58 R09: 2c7b7aa13b242c13
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff6afea2b0
R13: 00007fff6afea2c0 R14: 000055a8d6bf9169 R15: 00007efe34838a80
 </TASK>
