INFO: task syz.6.694:18978 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.694       state:D stack:28120 pid:18978 tgid:18977 ppid:16922  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x153c/0x4fe0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x8a1/0x1080
 down_write+0x1bc/0x200
 super_lock+0x289/0x3d0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x516/0x990
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4a0eb9acb9
RSP: 002b:00007f4a0f9b6028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f4a0ee15fa0 RCX: 00007f4a0eb9acb9
RDX: 0000000000000000 RSI: 0000200000000180 RDI: ffffffff80000201
RBP: 00007f4a0ec08bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000080 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4a0ee16038 R14: 00007f4a0ee15fa0 R15: 00007fff4b98f228
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e33f020 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
3 locks held by kworker/u10:10/3674:
 #0: ffff888100081948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x855/0x15a0
 #1: ffffc90003557c40 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x87c/0x15a0
 #2: ffffffff8f717a08 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60
1 lock held by dhcpcd/5557:
 #0: ffffffff8f717a08 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8a1/0x1be0
2 locks held by getty/5634:
 #0: ffff888114b1e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034802f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
3 locks held by kworker/u8:3/5842:
 #0: ffff8881751a8148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x855/0x15a0
 #1: ffffc900048c7c40 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x87c/0x15a0
 #2: ffffffff8f717a08 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x11e/0x14c0
2 locks held by syz-executor/6240:
1 lock held by syz.6.694/18978:
 #0: ffff8881acad20e0 (&type->s_umount_key#64){++++}-{4:4}, at: super_lock+0x289/0x3d0
1 lock held by syz.6.1012/25584:
 #0: ffff8881acad20e0 (&type->s_umount_key#64){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz-executor/27045:
 #0: ffffffff8f717a08 (rtnl_mutex){+.+.}-{4:4}, at: inet6_rtm_newaddr+0x65f/0xe30
8 locks held by syz-executor/27535:
 #0: ffff8881117bc420 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x227/0xb90
 #1: ffff88811e560c88 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1de/0x540
 #2: ffff8881606d55a8 (kn->active#48){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x231/0x540
 #3: ffffffff8efa2e28 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd7/0x370
 #4: ffff88816843d0e8 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xb6/0x800
 #5: ffff88816843b250 (&devlink->lock_key#27){+.+.}-{4:4}, at: nsim_drv_remove+0x50/0x160
 #6: ffffffff8f717a08 (rtnl_mutex){+.+.}-{4:4}, at: nsim_destroy+0x10b/0x730
 #7: ffffffff8e344638 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770
3 locks held by syz.9.1100/27965:

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

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+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xe83/0xed0
 kthread+0x388/0x470
 ret_from_fork+0x51b/0xa40
 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: 27965 Comm: syz.9.1100 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:save_netdev_trace_buffer+0x187/0x610
Code: 00 bf a0 00 00 00 4c 89 ee e8 15 6d 6f f8 4c 8d 63 18 4c 89 e0 48 c1 e8 03 42 0f b6 04 30 84 c0 0f 85 83 00 00 00 45 8b 24 24 <44> 89 e7 44 89 fe e8 ce 69 6f f8 45 39 fc 75 3d 49 81 fd a1 00 00
RSP: 0018:ffffc90000a08be0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffffff9a5986e0 RCX: ffff88810e02a480
RDX: 0000000000000100 RSI: 0000000000000003 RDI: 000000000000000a
RBP: ffffc90000a08d88 R08: 0000000000000004 R09: 0000000000000000
R10: fffff52000141108 R11: ffffffff81adf2a0 R12: 000000000000000a
R13: 0000000000000018 R14: dffffc0000000000 R15: 0000000000000003
FS:  00007f4936adf6c0(0000) GS:ffff8882a99f4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc2cee57c8 CR3: 00000001141ed000 CR4: 0000000000352ef0
Call Trace:
 <IRQ>
 dst_destroy+0x117/0x360
 rcu_core+0x7cd/0x1070
 handle_softirqs+0x22a/0x7c0
 __irq_exit_rcu+0x5f/0x150
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:vprintk_emit+0x45d/0x560
Code: 0f 84 44 ff ff ff e8 12 4d 20 00 fb eb 44 e8 0a 4d 20 00 e8 a5 07 d7 09 4d 85 f6 74 94 e8 fb 4c 20 00 fb 48 c7 c7 20 2f 33 8e <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 cb 25
RSP: 0018:ffffc900077dee00 EFLAGS: 00000293
RAX: ffffffff81a1e855 RBX: ffffffff81a1e6cf RCX: ffff88810e02a480
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e332f20
RBP: ffffc900077deeb0 R08: ffffffff8fc28d77 R09: 1ffffffff1f851ae
R10: dffffc0000000000 R11: fffffbfff1f851af R12: 0000000000000000
R13: 000000000000002f R14: 0000000000000200 R15: 1ffff92000efbdc4
 _printk+0xdd/0x130
 set_capacity_and_notify+0x2c5/0x320
 loop_set_size+0x44/0xb0
 loop_configure+0x9ac/0xdf0
 lo_ioctl+0x461/0x2010
 blkdev_ioctl+0x5e3/0x740
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4935b9a94b
Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00
RSP: 002b:00007f4936adedb0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f4935b9a94b
RDX: 0000000000000003 RSI: 0000000000004c00 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007f4936adeee0 R14: 00007f4936adeea0 R15: 00007f492b800000
 </TASK>
