INFO: task syz.6.261:8564 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.261       state:D stack:25624 pid:8564  tgid:8560  ppid:8268   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x6d9/0x940
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 bdev_super_lock+0x1db/0x370
 fs_bdev_sync+0x17/0x50
 blkdev_common_ioctl+0x12e1/0x3240
 blkdev_ioctl+0x528/0x740
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6df0b9cdd9
RSP: 002b:00007f6df19e3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6df0e16090 RCX: 00007f6df0b9cdd9
RDX: 0000000000000000 RSI: 0000000000001261 RDI: 0000000000000006
RBP: 00007f6df0c32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6df0e16128 R14: 00007f6df0e16090 R15: 00007ffca482e1c8
 </TASK>

Showing all locks held in the system:
1 lock held by pool_workqueue_/3:
 #0: ffffffff8e962fe8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
1 lock held by khungtaskd/34:
 #0: ffffffff8e95cce0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
1 lock held by dhcpcd/5557:
2 locks held by getty/5640:
 #0: ffff8881026e40a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000346b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
3 locks held by syz-executor/6240:
1 lock held by syz.6.261/8564:
 #0: ffff888113de60d8 (&type->s_umount_key#86){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
3 locks held by syz.1.606/11873:
2 locks held by dhcpcd/11882:
 #0: ffff88811dd16260 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x33/0xe10
 #1: ffffffff8e962fe8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770
6 locks held by dhcpcd-run-hook/11883:

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

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+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: 11883 Comm: dhcpcd-run-hook 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:debug_check_no_obj_freed+0x1d9/0x550
Code: 00 00 48 ba 00 00 00 00 00 fc ff df ff c3 48 8b 04 24 48 89 c5 48 85 c0 0f 84 44 03 00 00 49 89 ee 49 c1 ee 03 41 80 3c 16 00 <74> 12 48 89 ef e8 dd 67 75 fd 48 ba 00 00 00 00 00 fc ff df 48 8b
RSP: 0018:ffffc9000740f448 EFLAGS: 00000046
RAX: ffff88816eb57000 RBX: 000000000000000a RCX: 0000000000000001
RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffffc9000740f3a0
RBP: ffff88816eb57000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000e81e74 R12: ffff88819f448000
R13: ffff88819f440000 R14: 1ffff1102dd6ae00 R15: ffff88816ca3e058
FS:  00007fb06f74d380(0000) GS:ffff88818dc25000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffccbea2938 CR3: 000000010e15c000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __free_frozen_pages+0x593/0xd30
 __slab_free+0x274/0x2c0
 qlist_free_all+0x99/0x100
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 kmem_cache_alloc_noprof+0x2bc/0x650
 vm_area_dup+0x2b/0x680
 __split_vma+0x1dc/0xa40
 vma_modify+0x97e/0x1e10
 vma_modify_flags+0x24b/0x330
 mprotect_fixup+0x62a/0xb60
 do_mprotect_pkey+0x8d5/0xd20
 __x64_sys_mprotect+0x80/0x90
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb06fa73bb7
Code: 00 00 00 b8 0b 00 00 00 0f 05 48 3d 01 f0 ff ff 73 01 c3 48 8d 0d b9 46 01 00 f7 d8 89 01 48 83 c8 ff c3 b8 0a 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8d 0d 99 46 01 00 f7 d8 89 01 48 83
RSP: 002b:00007ffdebae3258 EFLAGS: 00000206 ORIG_RAX: 000000000000000a
RAX: ffffffffffffffda RBX: 00007fb06fa87ab0 RCX: 00007fb06fa73bb7
RDX: 0000000000000001 RSI: 0000000000002000 RDI: 00007fb06fa85000
RBP: 00007ffdebae3370 R08: 00007ffdebae0000 R09: 00007fb06fa4e500
R10: 00007fb06fa58858 R11: 0000000000000206 R12: 00007fb06fa87ab0
R13: 00007fb06fa7beda R14: 00007fb06fa869f0 R15: 00007fb06fa86f40
 </TASK>
