INFO: task syz.4.87:6440 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.87        state:D stack:24696 pid:6440  tgid:6439  ppid:6132   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x6d9/0x940
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x126/0x250
 __se_sys_quotactl+0x3a7/0x9e0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb7c179cdd9
RSP: 002b:00007fb7c2712028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fb7c1a15fa0 RCX: 00007fb7c179cdd9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000100
RBP: 00007fb7c1832d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb7c1a16038 R14: 00007fb7c1a15fa0 R15: 00007fff53553208
 </TASK>
INFO: task syz.3.97:6529 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.97        state:D stack:24488 pid:6529  tgid:6528  ppid:6115   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x6d9/0x940
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x126/0x250
 __se_sys_quotactl+0x3a7/0x9e0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe18e19cdd9
RSP: 002b:00007fe18f0b6028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fe18e415fa0 RCX: 00007fe18e19cdd9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000102
RBP: 00007fe18e232d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe18e416038 R14: 00007fe18e415fa0 R15: 00007fffbd4cfc38
 </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
3 locks held by kworker/0:2/797:
2 locks held by getty/5440:
 #0: ffff88816b4170a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000346b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
3 locks held by syz-executor/5625:
1 lock held by syz.4.87/6440:
 #0: ffff8881b0e640d8 (&type->s_umount_key#63){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.3.97/6529:
 #0: ffff8881b0e640d8 (&type->s_umount_key#63){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
2 locks held by syz-executor/6909:
1 lock held by syz.0.197/7742:
 #0: ffff8881b0e640d8 (&type->s_umount_key#63){++++}-{4:4}, at: super_lock+0x289/0x3d0
1 lock held by syz.1.246/7960:
 #0: ffff8881b0e640d8 (&type->s_umount_key#63){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
6 locks held by syz-executor/8388:
1 lock held by syz-executor/8390:
 #0: ffffffff8e963068 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
1 lock held by syz.9.413/8899:

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

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+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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 8388 Comm: syz-executor 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_acquire+0x17af/0x2cf0
Code: 48 89 05 94 ee 9f 14 48 8d 84 24 90 00 00 00 48 89 05 85 6e 9f 14 31 ff 45 31 e4 4d 85 e4 4c 8b 6c 24 10 74 30 49 8b 44 24 30 <48> 85 c0 74 26 48 8b 40 10 48 83 c0 30 49 8b 0c 24 48 89 8c 24 d8
RSP: 0018:ffffc900077eed20 EFLAGS: 00000086
RAX: ffffffff96c6d268 RBX: 00000000000003fd RCX: 000000000004f56a
RDX: ffffffff96d160d8 RSI: ffff88810a8be500 RDI: 00000000000003fd
RBP: 7667cd06550e1221 R08: ffffc900077eece8 R09: 0000000000000020
R10: 0000000000000003 R11: ffffffff81a20c90 R12: ffffffff96e678e8
R13: ffff88810a8be500 R14: ffff88810a8bd880 R15: 000000000000040a
FS:  000055556d16a500(0000) GS:ffff88818dc93000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055556d18da68 CR3: 000000002327a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 lock_acquire+0x106/0x350
 seqcount_lockdep_reader_access+0x55/0x100
 ktime_get+0x45/0x220
 clockevents_program_event+0x290/0x630
 __hrtimer_rearm_deferred+0x270/0x450
 irqentry_exit+0x6a0/0x730
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:console_flush_all+0x801/0xb20
Code: ff ff e8 42 e1 20 00 90 0f 0b 90 e9 85 fc ff ff e8 34 e1 20 00 e8 9f f2 02 0a 48 85 db 74 c0 e8 25 e1 20 00 fb 48 8b 5c 24 08 <48> 8b 44 24 20 42 80 3c 20 00 4c 8b 74 24 18 74 08 4c 89 f7 e8 f6
RSP: 0018:ffffc900077ef160 EFLAGS: 00000293
RAX: ffffffff81a4c28b RBX: ffffc900077ef2c0 RCX: ffff88810a8bd880
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900077ef270 R08: ffffffff903096f7 R09: 1ffffffff20612de
R10: dffffc0000000000 R11: fffffbfff20612df R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000000 R15: ffffffff8f2195a0
 console_unlock+0xd1/0x1c0
 vprintk_emit+0x485/0x560
 _printk+0xdd/0x130
 submit_bio_noacct+0x12b6/0x1bf0
 f2fs_mpage_readpages+0x28a1/0x2b70
 read_pages+0x193/0x5a0
 page_cache_ra_unbounded+0x794/0xa10
 page_cache_ra_order+0xae4/0xe80
 f2fs_readdir+0x4c0/0xac0
 iterate_dir+0x399/0x570
 __se_sys_getdents64+0xf1/0x280
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f408abc5773
Code: c7 c0 e8 ff ff ff 64 c7 00 16 00 00 00 31 c0 eb 9e e8 81 9b fd ff 90 b8 ff ff ff 7f 48 39 c2 48 0f 47 d0 b8 d9 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 c7 c2 e8 ff ff ff f7 d8
RSP: 002b:00007ffd67cbf4f8 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 000055556d185a30 RCX: 00007f408abc5773
RDX: 0000000000008000 RSI: 000055556d185a60 RDI: 0000000000000005
RBP: 000055556d185a60 R08: 00007f408adede20 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000293 R12: 000055556d185a34
R13: ffffffffffffffe8 R14: 0000000000000010 R15: 00007ffd67cc17a0
 </TASK>
