INFO: task syz.2.1910:21253 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.1910      state:D stack:24472 pid:21253 tgid:21252 ppid:20984  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1821/0x5740
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x6d9/0x940
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x540/0x9e0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f338859cdd9
RSP: 002b:00007f338938e028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f3388815fa0 RCX: 00007f338859cdd9
RDX: 0000000000000000 RSI: 0000200000000100 RDI: ffffffff80000802
RBP: 00007f3388632d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000300 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3388816038 R14: 00007f3388815fa0 R15: 00007ffd3f4b3fa8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e95cd60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5436:
 #0: ffff8881146050a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034732e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
2 locks held by syz-executor/15924:
2 locks held by syz-executor/17119:
2 locks held by syz-executor/18530:
1 lock held by syz.2.1910/21253:
 #0: ffff88810de4c0d8 (&type->s_umount_key#83){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
2 locks held by syz-executor/21740:
1 lock held by syz.0.1981/21998:
 #0: ffff8881202de0d8 (&type->s_umount_key#83){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
2 locks held by syz-executor/23020:
3 locks held by syz.2.2173/23444:

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

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+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xfd3/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 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: 23 Comm: ksoftirqd/1 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:lock_release+0x104/0x3c0
Code: 49 8d af 90 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 01 eb 48 8d 6c dd 00 48 89 ef <4c> 89 f6 e8 a4 b6 07 0a 44 89 64 24 14 45 89 e5 85 c0 0f 84 d7 00
RSP: 0000:ffffc900001d69d0 EFLAGS: 00000006
RAX: 0000000000000003 RBX: 000000000000000a RCX: 0000000080000301
RDX: ffffc900001d6b01 RSI: ffffffff8dfc2a02 RDI: ffff8881604f6460
RBP: ffff8881604f6460 R08: ffffc900001d7c60 R09: 0000000000000000
R10: ffffc900001d6b58 R11: fffff5200003ad6d R12: 0000000000000002
R13: 0000000000000002 R14: ffffffff8e95cd60 R15: ffff8881604f5880
FS:  0000000000000000(0000) GS:ffff8882a9287000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9ae6e32000 CR3: 000000019f754000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 unwind_next_frame+0x1bba/0x2550
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5c/0x80
 kfree+0x1c5/0x640
 ieee80211_inform_bss+0xc75/0x1160
 cfg80211_inform_single_bss_data+0xcf9/0x1af0
 cfg80211_inform_bss_data+0x266/0x3c40
 cfg80211_inform_bss_frame_data+0x3c7/0x730
 ieee80211_bss_info_update+0x794/0xa40
 ieee80211_scan_rx+0x552/0xa40
 ieee80211_rx_list+0x29f8/0x3740
 ieee80211_rx_napi+0x1b1/0x3e0
 ieee80211_handle_queued_frames+0xe8/0x1e0
 tasklet_action_common+0x2da/0x4b0
 handle_softirqs+0x22a/0x840
 run_ksoftirqd+0x36/0x60
 smpboot_thread_fn+0x541/0xa50
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
