INFO: task syz.2.238:7867 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.238       state:D stack:25128 pid:7867  tgid:7866  ppid:7524   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: 0033:0x7f893438ec29
RSP: 002b:00007f89351fd038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f89345d5fa0 RCX: 00007f893438ec29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f89345d5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f89345d6038 R14: 00007f89345d5fa0 R15: 00007fff9867ba98
 </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/5675:
 #0: ffff88810ec9f0a0 (&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
3 locks held by syz-executor/7564:
1 lock held by syz.2.238/7867:
 #0: ffff8880296040e0 (&type->s_umount_key#58){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.7.438/9545:
 #0: ffff8880296040e0 (&type->s_umount_key#58){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.8.520/10386:
 #0: ffff8880296040e0 (&type->s_umount_key#58){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.8.520/10387:
 #0: ffff8880296040e0 (&type->s_umount_key#58){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.8.520/10388:
 #0: ffff8880296040e0 (&type->s_umount_key#58){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.0.553/10614:
 #0: ffff8880296040e0 (&type->s_umount_key#58){++++}-{4:4}, at: super_lock+0x25c/0x3b0
2 locks held by syz.6.587/10792:

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

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+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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 7564 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:rcu_read_lock_held+0x15/0x50
Code: 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 53 e8 e6 2c d5 09 85 c0 74 26 31 db e8 eb 2d 01 00 <84> c0 74 20 e8 62 76 01 00 84 c0 74 17 48 c7 c7 e0 a0 13 8e be ff
RSP: 0018:ffffc9000391f548 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: becc70594be43500
RDX: ffff88801ee21cc0 RSI: ffffffff8be33f60 RDI: ffffffff8be33f20
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff81f6a17d
R10: ffffc9000391f660 R11: fffff52000723ecf R12: ffff88803b4dc108
R13: ffffc9000391f658 R14: ffffc9000391f640 R15: 1ffff92000723ecb
FS:  00005555626bd500(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055556e9005c8 CR3: 000000011bc6a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 xas_start+0x295/0x770
 xas_load+0x2c/0x5b0
 filemap_get_entry+0x168/0x2f0
 __filemap_get_folio+0x68/0xaf0
 f2fs_grab_cache_folio+0x2b/0x380
 __get_node_folio+0x194/0x1410
 f2fs_update_inode_page+0x82/0x190
 f2fs_write_checkpoint+0xb6e/0x1df0
 kill_f2fs_super+0x2c3/0x6c0
 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: 0033:0x7f6894b8ff57
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffe9e8f4158 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f6894c11c2d RCX: 00007f6894b8ff57
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe9e8f4210
RBP: 00007ffe9e8f4210 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffe9e8f52a0
R13: 00007f6894c11c2d R14: 000000000001f664 R15: 00007ffe9e8f52e0
 </TASK>
