INFO: task syz.6.8513:5684 blocked for more than 143 seconds.
      Tainted: G S           L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.8513      state:D stack:27520 pid:5684  tgid:5683  ppid:4196   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x6ba/0x920
 down_read+0x9c/0x330
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x120/0x240
 __se_sys_quotactl+0x3a0/0x9a0
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb84e99e019
RSP: 002b:00007fb84f86d028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fb84ec25fa0 RCX: 00007fb84e99e019
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000102
RBP: 00007fb84ea3500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb84ec26038 R14: 00007fb84ec25fa0 R15: 00007ffe72429408
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/u8:1/13:
 #0: ffff88810dd54140 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90000127c40 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffffffff9002d500 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x116/0x15c0
1 lock held by khungtaskd/34:
 #0: ffffffff8eb59ca0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
3 locks held by kworker/u10:4/82:
 #0: ffff8881000ac140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc9000272fc40 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffffffff9002d500 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60
2 locks held by getty/5437:
 #0: ffff88816ecd70a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034732e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
5 locks held by kworker/1:4/27094:
 #0: ffff888168204140 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90007ca7c40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffff88816e25b1d8 (&dev->mutex){....}-{4:4}, at: hub_event+0x184/0x4d30
 #3: ffff88816e3121d8 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x450
 #4: ffff88816e3131a0 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x450
2 locks held by syz-executor/28044:
1 lock held by syz.6.8513/5684:
 #0: ffff8881ad5fc0d8 (&type->s_umount_key#59){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.9.9277/8213:
 #0: ffff8881ad5fc0d8 (&type->s_umount_key#59){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.3.9334/8385:
 #0: ffff88803ed1be68 (&fc->uapi_mutex){+.+.}-{4:4}, at: __se_sys_fsconfig+0x68d/0x810
4 locks held by udevd/9005:
 #0: ffff88803a585518 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xa4/0xca0
 #1: ffff888112627080 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x5d/0x420
 #2: ffff8881be514a58 (kn->active#26){++++}-{0:0}, at: kernfs_seq_start+0xb2/0x420
 #3: ffff88816e3121d8 (&dev->mutex){....}-{4:4}, at: manufacturer_show+0x26/0xa0
2 locks held by syz.7.9506/9095:
 #0: ffffffff9002d500 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3e/0x1c0
 #1: ffffffff8eb5ffa8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770
3 locks held by syz.8.9510/9111:
 #0: ffffffff9ab2c1c8 (&rdma_nl_types[idx].sem){.+.+}-{4:4}, at: rdma_nl_rcv+0x33d/0xa40
 #1: ffffffff8fd8bfa8 (link_ops_rwsem){++++}-{4:4}, at: nldev_newlink+0x429/0x650
 #2: ffffffff9002d500 (rtnl_mutex){+.+.}-{4:4}, at: ib_get_eth_speed+0x173/0x7f0
1 lock held by syz.1.9519/9133:
 #0: ffffffff9002d500 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8a3/0x1bd0

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 Comm: khungtaskd Tainted: G S           L      syzkaller #0 PREEMPT(full) 
Tainted: [S]=CPU_OUT_OF_SPEC, [L]=SOFTLOCKUP
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/0x380
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 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: 5664 Comm: kworker/u8:3 Tainted: G S           L      syzkaller #0 PREEMPT(full) 
Tainted: [S]=CPU_OUT_OF_SPEC, [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
RIP: 0010:asm_sysvec_call_function_single+0x0/0x20
Code: 46 74 d1 0a e9 01 06 00 00 90 f3 0f 1e fa 0f 1f 00 fc 6a ff e8 b1 04 00 00 48 89 c4 48 89 e7 e8 56 73 d1 0a e9 e1 05 00 00 90 <f3> 0f 1e fa 0f 1f 00 fc 6a ff e8 91 04 00 00 48 89 c4 48 89 e7 e8
RSP: 0018:ffffc900049ff878 EFLAGS: 00000096
RAX: 108b158234349100 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 000000005fcb27e1 RSI: ffffffff8e4b2d1f RDI: ffffffff8c4be180
RBP: ffff88811f85bc00 R08: 3a00000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8eb59ca0 R12: ffffffff8eb59ca0
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000246
FS:  0000000000000000(0000) GS:ffff88818d94d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efdbb7eb700 CR3: 000000017122a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
RIP: 0010:lock_acquire+0x231/0x350
Code: ff ff ff e8 31 e3 2e 0a f7 44 24 10 00 02 00 00 0f 84 39 ff ff ff 65 48 8b 05 1b 7e ca 11 48 3b 44 24 50 75 33 fb 48 83 c4 58 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 c0 e5 31 0a cc 48 8d 3d 98 6a b8
RSP: 0018:ffffc900049ff8a0 EFLAGS: 00000296
 batadv_iv_ogm_schedule+0x485/0xff0
 batadv_iv_send_outstanding_bat_ogm_packet+0x67a/0x790
 process_scheduled_works+0xa8e/0x14e0
 worker_thread+0xa47/0xfb0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
