INFO: task syz.4.3213:22286 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.3213      state:D stack:24640 pid:22286 tgid:22285 ppid:16068  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x61e/0x920
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x126/0x290
 __ia32_sys_sync+0xa0/0x120
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f43ccf9c819
RSP: 002b:00007f43cdded028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f43cd215fa0 RCX: 00007f43ccf9c819
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f43cd215fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f43cd216038 R14: 00007f43cd215fa0 R15: 00007ffc6c7468c8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e75e620 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5639:
 #0: ffff8881127440a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
2 locks held by syz-executor/16953:
1 lock held by syz.4.3213/22286:
 #0: ffff8881698e40e0 (&type->s_umount_key#52){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.8.3677/24257:
 #0: ffff8881698e40e0 (&type->s_umount_key#52){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
2 locks held by syz.0.3788/24784:
1 lock held by syz.1.3789/24786:
1 lock held by udevadm/24787:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 34 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xfd9/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 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: 24784 Comm: syz.0.3788 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:lock_release+0xe4/0x3d0
Code: 01 00 00 41 8b 87 50 0b 00 00 85 c0 0f 84 17 01 00 00 4c 89 6c 24 18 48 89 5c 24 08 44 8d 60 ff 49 8d af 58 0b 00 00 4d 63 ec <48> 89 04 24 83 f8 32 0f 83 2a 02 00 00 4a 8d 1c ad 00 00 00 00 4c
RSP: 0018:ffffc90004a06f50 EFLAGS: 00000002
RAX: 0000000000000002 RBX: 0000000000000202 RCX: 0000000000000046
RDX: ffffc90004a07001 RSI: ffffffff8df16614 RDI: ffffffff8c27fd00
RBP: ffff8881130c2898 R08: ffffc90004a07788 R09: 0000000000000000
R10: ffffc90004a070d8 R11: fffff52000940e1d R12: 0000000000000001
R13: 0000000000000001 R14: ffffffff8e75e620 R15: ffff8881130c1d40
FS:  00007efd411b16c0(0000) GS:ffff8882a9462000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005631ea72b668 CR3: 000000017135a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 unwind_next_frame+0x1aaa/0x23c0
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 save_stack+0x122/0x230
 __reset_page_owner+0x71/0x1f0
 free_unref_folios+0xcec/0x1480
 folios_put_refs+0x9ff/0xb40
 free_pages_and_swap_cache+0x2b9/0x490
 tlb_flush_mmu+0x6d3/0xa30
 tlb_finish_mmu+0xf9/0x230
 exit_mmap+0x498/0xa10
 __mmput+0x118/0x430
 exit_mm+0x168/0x220
 do_exit+0x6a2/0x22c0
 do_group_exit+0x21b/0x2d0
 get_signal+0x1284/0x1330
 arch_do_signal_or_restart+0xbc/0x830
 exit_to_user_mode_loop+0x86/0x480
 do_syscall_64+0x32d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efd4039c819
Code: Unable to access opcode bytes at 0x7efd4039c7ef.
RSP: 002b:00007efd411b10e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007efd40616098 RCX: 00007efd4039c819
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007efd40616098
RBP: 00007efd40616090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efd40616128 R14: 00007ffe4ef49b70 R15: 00007ffe4ef49c58
 </TASK>
