INFO: task syz.6.333:9156 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.333       state:D stack:23104 pid:9156  tgid:9155  ppid:8716   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: 0033:0x7fedf419c799
RSP: 002b:00007fedf4ff6028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fedf4415fa0 RCX: 00007fedf419c799
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fedf4415fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fedf4416038 R14: 00007fedf4415fa0 R15: 00007fff69c332b8
 </TASK>
INFO: task syz.5.357:9433 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.357       state:D stack:24960 pid:9433  tgid:9432  ppid:9116   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
 __se_sys_quotactl+0x3a7/0x9e0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5954f9c799
RSP: 002b:00007f5955de8028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f5955215fa0 RCX: 00007f5954f9c799
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000102
RBP: 00007f5955032c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5955216038 R14: 00007f5955215fa0 R15: 00007ffe74d949a8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8e75e520 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5638:
 #0: ffff8881786110a0 (&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
3 locks held by syz-executor/6454:
1 lock held by syz.6.333/9156:
 #0: ffff8881bcb620e0 (&type->s_umount_key#67){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.5.357/9433:
 #0: ffff8881bcb620e0 (&type->s_umount_key#67){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.0.424/10183:
 #0: ffff8881bcb620e0 (&type->s_umount_key#67){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.0.424/10185:
 #0: ffff8881bcb620e0 (&type->s_umount_key#67){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.0.424/10186:
 #0: ffff8881bcb620e0 (&type->s_umount_key#67){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.0.424/10187:
 #0: ffff8881bcb620e0 (&type->s_umount_key#67){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.0.424/10190:
 #0: ffff8881bcb620e0 (&type->s_umount_key#67){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.0.424/10192:
 #0: ffff8881bcb620e0 (&type->s_umount_key#67){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.0.424/10193:
 #0: ffff8881bcb620e0 (&type->s_umount_key#67){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.0.424/10194:
 #0: ffff8881bcb620e0 (&type->s_umount_key#67){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.1.529/11933:
 #0: ffff8881bcb620e0 (&type->s_umount_key#67){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.1.529/11934:
 #0: ffff8881bcb620e0 (&type->s_umount_key#67){++++}-{4:4}, at: super_lock+0x2d6/0x3d0

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 35 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+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: 14989 Comm: syz.5.794 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:its_return_thunk+0x0/0x10
Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc <c3> cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 e9 2b ca 81 f5 cc
RSP: 0018:ffffc9000841f540 EFLAGS: 00000293
RAX: ffffffff821c6048 RBX: ffffea000631db80 RCX: ffff88816d961d40
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffea000631db87 R09: 1ffffd4000c63b70
R10: dffffc0000000000 R11: fffff94000c63b71 R12: 0000000000000040
R13: dffffc0000000000 R14: ffffea000631db80 R15: ffffea000631db80
FS:  0000555589109500(0000) GS:ffff8882a945d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000200 CR3: 000000018d0e2000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 folio_remove_rmap_ptes+0x1c8/0x1050
 unmap_page_range+0x1c33/0x48f0
 unmap_vmas+0x48f/0x6a0
 exit_mmap+0x280/0xa10
 __mmput+0x118/0x430
 exit_mm+0x168/0x220
 do_exit+0x6a2/0x23c0
 do_group_exit+0x21b/0x2d0
 __x64_sys_exit_group+0x3f/0x40
 x64_sys_call+0x221a/0x2240
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f928f19c799
Code: Unable to access opcode bytes at 0x7f928f19c76f.
RSP: 002b:00007fff2fd7d778 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f928f19c799
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fff2fd7d7dc R08: 0000000000000000 R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 000000000000001c
R13: 00000000000927c0 R14: 00000000000537dd R15: 00007fff2fd7d830
 </TASK>
