INFO: task syz.3.119:6720 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.119       state:D stack:25128 pid:6720  tgid:6719  ppid:6110   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
 __se_sys_quotactl+0x353/0x950
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f427f98ebe9
RSP: 002b:00007f42807df038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f427fbb5fa0 RCX: 00007f427f98ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000102
RBP: 00007f427fa11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f427fbb6038 R14: 00007f427fbb5fa0 R15: 00007ffd1a0f5488
 </TASK>

Showing all locks held in the system:
1 lock held by pool_workqueue_/3:
 #0: ffffffff8e13f978 (rcu_state.exp_mutex){+.+.}-{4:4}, at: pwq_release_workfn+0x3dc/0x870
3 locks held by kworker/u8:1/14:
 #0: ffff888021d13148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90000117bc0 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8f538888 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x112/0x14b0
1 lock held by khungtaskd/34:
 #0: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5675:
 #0: ffff8880226110a0 (&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
4 locks held by syz-executor/5852:
3 locks held by kworker/1:4/5916:
 #0: ffff88801a480d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc9000470fbc0 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff888000199240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x26b/0x3180
1 lock held by syz.3.119/6720:
 #0: ffff8880364d80e0 (&type->s_umount_key#63){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.4.140/6818:
 #0: ffff8880364d80e0 (&type->s_umount_key#63){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.6.226/7527:
 #0: ffff8880364d80e0 (&type->s_umount_key#63){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by bch-rebalance/l/7551:
1 lock held by syz-executor/8527:
 #0: ffffffff8f538888 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/0x18b0
3 locks held by syz-executor/8545:
 #0: ffffffff8f538888 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8db/0x1c70
 #1: ffff88804ade0d30 (&dev_instance_lock_key#20){+.+.}-{4:4}, at: do_setlink+0x388/0x41c0
 #2: ffffffff8e13f978 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730
3 locks held by syz.2.364/8684:
 #0: ffff888107f76400 (&lo->lo_mutex){+.+.}-{4:4}, at: loop_set_status+0xa3/0xce0
 #1: ffff888107f0b1b8 (&q->q_usage_counter(io)#19){++++}-{0:0}, at: loop_set_status+0x2ea/0xce0
 #2: ffff888107f0b1f0 (&q->q_usage_counter(queue)#3){+.+.}-{0:0}, at: loop_set_status+0x2ea/0xce0

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

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+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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 7551 Comm: bch-rebalance/l 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_lockdep_current_cpu_online+0xf1/0x120
Code: 7c 00 4c 85 3b 75 1a 48 c7 c7 00 fb 13 8e be 04 00 00 00 e8 91 75 7c 00 83 3d 6a 54 6d 0c 00 74 16 b0 01 65 ff 0d 8f a9 f9 10 <74> 0f 5b 41 5e 41 5f c3 cc cc cc cc cc 31 c0 eb e8 e8 79 20 8d ff
RSP: 0018:ffffc900024edde0 EFLAGS: 00000082
RAX: 1ffffffff1c27e01 RBX: ffffffff8e13f270 RCX: 8c7b67108f3edd00
RDX: dffffc0000000000 RSI: ffffffff8be33660 RDI: ffff88813663afa8
RBP: ffffc900024ede80 R08: ffff88801f03b980 R09: ffffffff819b8643
R10: dffffc0000000000 R11: ffffed1003e07731 R12: 0000000000000000
R13: dffffc0000000000 R14: dffffc0000000000 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8881a3c1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f98f9234440 CR3: 000000002958a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 rcu_read_lock_sched_held+0x74/0x100
 task_psi_group+0x50/0x1a0
 psi_task_switch+0x393/0x880
 __schedule+0x22e9/0x4cc0
 preempt_schedule_notrace+0xd1/0x110
 preempt_schedule_notrace_thunk+0x16/0x30
 rcu_is_watching+0x7f/0xb0
 lock_acquire+0x5f/0x360
 six_trylock_ip+0x9a/0xd0
 bch2_btree_path_traverse_one+0x930/0x21d0
 bch2_btree_iter_peek_max+0x9e8/0x58f0
 bch2_bucket_alloc_trans+0xd21/0x1d50
 bch2_bucket_alloc_set_trans+0x5a6/0xe70
 __open_bucket_add_buckets+0x1437/0x1e40
 open_bucket_add_buckets+0x2ee/0x440
 bch2_alloc_sectors_start_trans+0xd26/0x1e80
 __bch2_write+0x606/0x3900
 bch2_moving_ctxt_do_pending_writes+0x5a7/0xe60
 bch2_move_ratelimit+0x8e8/0x1330
 bch2_rebalance_thread+0x17b0/0x1f80
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </TASK>
