INFO: task syz.1.1221:17481 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.1221      state:D stack:24664 pid:17481 tgid:17480 ppid:16531  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x16f9/0x5500
 rt_mutex_schedule+0x76/0xf0
 __rt_mutex_slowlock_locked+0x1f28/0x2550
 __rwbase_read_lock+0xc3/0x180
 down_read+0x132/0x200
 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: 0033:0x7f8f3ca6cdd9
RSP: 002b:00007f8f3acbe028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f8f3cce5fa0 RCX: 00007f8f3ca6cdd9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000101
RBP: 00007f8f3cb02d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8f3cce6038 R14: 00007f8f3cce5fa0 R15: 00007ffd5a5204d8
 </TASK>

Showing all locks held in the system:
3 locks held by ksoftirqd/0/15:
 #0: ffffffff8de5f380 (local_bh){.+.+}-{1:3}, at: __local_bh_disable_ip+0x3c/0x420
 #1: ffffffff8dfc8240 (rcu_read_lock){....}-{1:3}, at: __local_bh_disable_ip+0x3c/0x420
 #2: ffffffff8dfc8240 (rcu_read_lock){....}-{1:3}, at: sched_balance_domains+0xf9/0x900
6 locks held by kworker/u9:0/34:
 #0: ffff8881000ac138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x897/0x1630
 #1: ffffc90000a97c40 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_one_work+0x8be/0x1630
 #2: ffff88816de5e310 (&devlink->lock_key#43){+.+.}-{4:4}, at: nsim_dev_trap_report_work+0x57/0xbd0
 #3: ffff88816ebb9120 (&nsim_trap_data->trap_lock){+.+.}-{3:3}, at: nsim_dev_trap_report_work+0x1ad/0xbd0
 #4: ffffffff8dfc8240 (rcu_read_lock){....}-{1:3}, at: rt_spin_lock+0x1e0/0x400
 #5: ffffffff8dfc8240 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xa6/0x2550
3 locks held by kworker/u9:1/40:
 #0: ffff8881000ac138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x897/0x1630
 #1: ffffc90000af7c40 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x8be/0x1630
 #2: ffffffff8f371f78 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60
1 lock held by khungtaskd/43:
 #0: ffffffff8dfc8240 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
5 locks held by kworker/u10:11/1526:
 #0: ffff888119913938 ((wq_completion)btrfs-endio-write){+.+.}-{0:0}, at: process_one_work+0x897/0x1630
 #1: ffffc900090c7c40 ((work_completion)(&work->normal_work)){+.+.}-{0:0}, at: process_one_work+0x8be/0x1630
 #2: ffff88810fadf228 (btrfs_ordered_extent){++++}-{0:0}, at: btrfs_finish_one_ordered+0x39c/0x2680
 #3: ffff888119be0770 (sb_internal#5){++++}-{0:0}, at: btrfs_finish_one_ordered+0x88e/0x2680
 #4: ffffffff8e10d270 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_read_lock+0x27/0x60
2 locks held by dhcpcd/5331:
 #0: ffffffff8f352578 (vlan_ioctl_mutex){+.+.}-{4:4}, at: sock_ioctl+0x644/0x7f0
 #1: ffffffff8f371f78 (rtnl_mutex){+.+.}-{4:4}, at: vlan_ioctl_handler+0xf0/0x630
2 locks held by getty/5418:
 #0: ffff88817862f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc90003f062e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x462/0x13a0
8 locks held by kworker/u8:4/5663:
 #0: ffff888176846938 ((wq_completion)bat_events){+.+.}-{0:0}, at: process_one_work+0x897/0x1630
 #1: ffffc900057dfc40 ((work_completion)(&(&forw_packet_aggr->delayed_work)->work)){+.+.}-{0:0}, at: process_one_work+0x8be/0x1630
 #2: ffff888176d8f910 (&hard_iface->bat_iv.ogm_buff_mutex){+.+.}-{4:4}, at: batadv_iv_ogm_schedule+0xef/0xf60
 #3: ffffffff8dfc8240 (rcu_read_lock){....}-{1:3}, at: batadv_iv_ogm_schedule+0x45c/0xf60
 #4: ffffffff8dfc8240 (rcu_read_lock){....}-{1:3}, at: __local_bh_disable_ip+0x3c/0x420
 #5: ffff8881193a1a80 (_T->lock){....}-{2:2}, at: rt_mutex_slowunlock+0xbf/0x8b0
 #6: ffffffff8dfc8240 (rcu_read_lock){....}-{1:3}, at: rt_spin_lock+0x1e0/0x400
 #7: ffffffff8dfc8240 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xa6/0x2550
4 locks held by kworker/u8:5/5703:
 #0: ffff8881012ad938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x897/0x1630
 #1: ffffc900070bfc40 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x8be/0x1630
 #2: ffffffff8f362ac0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf4/0x800
 #3: ffffffff8f371f78 (rtnl_mutex){+.+.}-{4:4}, at: ieee80211_unregister_hw+0x55/0x2c0
3 locks held by syz-executor/13834:
 #0: ffff88810f11e0d0 (&type->s_umount_key#58){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffff888113a44348 (&sbi->cp_global_sem_key){+.+.}-{4:4}, at: f2fs_write_checkpoint+0x2ed/0x26a0
 #2: ffffffff8dfc8240 (rcu_read_lock){....}-{1:3}, at: filemap_get_entry+0xcd/0x3f0
1 lock held by syz.1.1221/17481:
 #0: ffff88810f11e0d0 (&type->s_umount_key#58){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
2 locks held by syz-executor/17591:
 #0: ffff88818f35c0d0 (&type->s_umount_key#58){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffff88816fa54348 (&sbi->cp_global_sem_key#2){+.+.}-{4:4}, at: f2fs_write_checkpoint+0x2ed/0x26a0
9 locks held by syz-executor/18470:
 #0: ffff88810e520480 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x22d/0xba0
 #1: ffff888112496c78 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1df/0x540
 #2: ffff88816ce2b968 (kn->active#48){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x232/0x540
 #3: ffffffff8ebe8758 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd7/0x370
 #4: ffff888179ab3160 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xb6/0x870
 #5: ffff888189f34310 (&devlink->lock_key#47){+.+.}-{4:4}, at: nsim_drv_remove+0x50/0x160
 #6: ffffffff8f371f78 (rtnl_mutex){+.+.}-{4:4}, at: nsim_destroy+0x16b/0x7f0
 #7: ffffffff8dfc8240 (rcu_read_lock){....}-{1:3}, at: mntput_no_expire+0x1c/0x1c0
 #8: ffffffff8dc1cc50 (mount_lock){+.+.}-{3:3}, at: mntput_no_expire_slowpath+0x106/0xbd0
2 locks held by syz-executor/18541:
 #0: ffffffff8ead8288 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x23/0x250
 #1: ffffffff8f371f78 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x883/0x1bb0
6 locks held by syz.9.1339/18614:
 #0: ffff888119be0480 (sb_writers#16){++++}-{0:0}, at: mnt_want_write_file+0x63/0x210
 #1: ffff888119be0770 (sb_internal#5){++++}-{0:0}, at: btrfs_ioctl_set_fslabel+0x2b5/0x500
 #2: ffff88810fadf1d8 (btrfs_trans_completed){.+.+}-{0:0}, at: btrfs_commit_transaction+0x17f/0x2fc0
 #3: ffff88810fadf1b0 (btrfs_trans_super_committed){.+.+}-{0:0}, at: btrfs_commit_transaction+0x17f/0x2fc0
 #4: ffff88810fadf188 (btrfs_trans_unblocked){++++}-{0:0}, at: btrfs_commit_transaction+0x17f/0x2fc0
 #5: ffff88810fadcd18 (&fs_info->tree_log_mutex){+.+.}-{4:4}, at: btrfs_commit_transaction+0x1c14/0x2fc0
6 locks held by syz.9.1339/18617:
 #0: ffff888119be0480 (sb_writers#16){++++}-{0:0}, at: direct_splice_actor+0x49/0x160
 #1: ffff88818a23e240 (&sb->s_type->i_mutex_key#27){++++}-{4:4}, at: btrfs_inode_lock+0x51/0xe0
 #2: ffff88818a23e0a0 (&ei->i_mmap_lock){+.+.}-{4:4}, at: btrfs_inode_lock+0xcb/0xe0
 #3: ffff888119be0770 (sb_internal#5){++++}-{0:0}, at: btrfs_sync_file+0xcae/0x1230
 #4: ffffffff8e10d270 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_read_lock+0x27/0x60
 #5: ffff888100040b58 (&n->list_lock){+.+.}-{3:3}, at: __slab_free+0xf1/0x2a0

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 43 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(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: 1024 Comm: kworker/u9:5 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: events_unbound nsim_dev_trap_report_work
RIP: 0010:memset_orig+0x4a/0xb0
Code: d1 48 c1 e9 06 74 39 66 0f 1f 84 00 00 00 00 00 48 ff c9 48 89 07 48 89 47 08 48 89 47 10 48 89 47 18 48 89 47 20 48 89 47 28 <48> 89 47 30 48 89 47 38 48 8d 7f 40 75 d8 0f 1f 84 00 00 00 00 00
RSP: 0018:ffffc90007c57990 EFLAGS: 00000206
RAX: 0000000000000000 RBX: 00000000ffffff00 RCX: 000000000000003c
RDX: 0000000000001000 RSI: 0000000000000000 RDI: ffff888120da80c0
RBP: 0000000000082820 R08: ffffffff8f8acbf7 R09: 0000000000000000
R10: ffff888120da8000 R11: fffffbfff1f1597f R12: ffff888100042140
R13: ffff888120da8000 R14: 0000000000001000 R15: 0000000000001000
FS:  0000000000000000(0000) GS:ffff88818e91f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558a99161160 CR3: 0000000177f3e000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __kmalloc_node_track_caller_noprof+0x345/0x7e0
 __alloc_skb+0x2c1/0x7d0
 nsim_dev_trap_report_work+0x29f/0xbd0
 process_one_work+0x98b/0x1630
 worker_thread+0xb49/0x1140
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
