INFO: task syz.0.1068:18226 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.1068      state:D stack:25128 pid:18226 tgid:18225 ppid:16821  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
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x4da/0x950
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f03c978eba9
RSP: 002b:00007f03ca569038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f03c99d5fa0 RCX: 00007f03c978eba9
RDX: 0000000000000000 RSI: 0000200000000c80 RDI: ffffffff80000900
RBP: 00007f03c9811e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f03c99d6038 R14: 00007f03c99d5fa0 R15: 00007fffbb383b18
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e139f60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5675:
 #0: ffff888110b850a0 (&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
2 locks held by syz-executor/5852:
1 lock held by syz.0.1068/18226:
 #0: ffff8880124500e0 (&type->s_umount_key#66){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
4 locks held by syz-executor/4415:
 #0: ffff88810f60a428 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x211/0xb30
 #1: ffff88810b1ef088 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1e0/0x4f0
 #2: ffff8880224f02d8 (kn->active#49){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x203/0x4f0
 #3: ffffffff8edafe68 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: new_device_store+0x12c/0x6f0
9 locks held by syz-executor/4452:
 #0: ffff88810f60a428 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x211/0xb30
 #1: ffff88810ff2a088 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1e0/0x4f0
 #2: ffff8880224f03c8 (kn->active#48){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x203/0x4f0
 #3: ffffffff8edafe68 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd1/0x360
 #4: ffff8881278390e8 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xb6/0x800
 #5: ffff88811b528250 (&devlink->lock_key#11){+.+.}-{4:4}, at: nsim_drv_remove+0x50/0x160
 #6: ffffffff8f539b48 (rtnl_mutex){+.+.}-{4:4}, at: nsim_destroy+0xe5/0x670
 #7: ffff88810aa10d30 (&dev_instance_lock_key#20){+.+.}-{4:4}, at: unregister_netdevice_many_notify+0x52f/0x1ff0
 #8: ffffffff8e13f9f8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730
3 locks held by syz.1.1451/6473:
2 locks held by dhcpcd-run-hook/6482:

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

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+0x3fc/0x770
 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: 5852 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_is_watching+0x3a/0xb0
Code: e8 1b e1 d3 09 89 c3 83 f8 08 73 65 49 bf 00 00 00 00 00 fc ff df 4c 8d 34 dd 10 1d be 8d 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 <74> 08 4c 89 f7 e8 ac c0 7c 00 48 c7 c3 98 df a1 92 49 03 1e 48 89
RSP: 0018:ffffc90002e9f3c8 EFLAGS: 00000246
RAX: 1ffffffff1b7c3a2 RBX: 0000000000000000 RCX: 172ee452069b2c00
RDX: 0000000000000000 RSI: ffffffff8be339e0 RDI: ffffffff8be339a0
RBP: 0000000000000001 R08: ffffea0000ec14f7 R09: 1ffffd40001d829e
R10: dffffc0000000000 R11: fffff940001d829f R12: dffffc0000000000
R13: ffffffff81f6a54c R14: ffffffff8dbe1d10 R15: dffffc0000000000
FS:  000055558f1d8500(0000) GS:ffff8880b8615000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcd63e9e1d0 CR3: 0000000041ce8000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 lock_release+0x4b/0x3e0
 folio_try_get+0x1d1/0x340
 filemap_get_entry+0x1b8/0x2f0
 __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
 do_exit+0x6b5/0x2300
 do_group_exit+0x21c/0x2d0
 __x64_sys_exit_group+0x3f/0x40
 x64_sys_call+0x21f7/0x2200
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6b7b98eba9
Code: Unable to access opcode bytes at 0x7f6b7b98eb7f.
RSP: 002b:00007ffecfecffe8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f6b7ba11c77 RCX: 00007f6b7b98eba9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000010 R08: 00007ffecfecdd86 R09: 00007ffecfed12a0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffecfed12a0
R13: 00007f6b7ba11c05 R14: 000055558f1d84a8 R15: 00007ffecfed2370
 </TASK>
