Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 1 UID: 0 PID: 6925 Comm: syz.2.365 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:unpin_user_page_range_dirty_lock+0x63/0x4e0
Code: 45 31 ed 4c 89 74 24 18 4c 89 6c 24 10 49 c1 e5 06 4b 8d 1c 2e 48 83 c3 08 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 ff 3e 1c 00 4d 01 f5 4c 8b 23 4c 89
RSP: 0018:ffffc900046af770 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000008 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffea00010b8037 R09: 1ffffd4000217006
R10: dffffc0000000000 R11: fffff94000217007 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000555590747500(0000) GS:ffff8881a39fa000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32817ff8 CR3: 0000000039736000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 batch_unpin+0x3eb/0x560
 __iopt_area_unfill_domain+0x6c2/0xc60
 iopt_table_remove_domain+0x57c/0x7c0
 iommufd_hwpt_paging_destroy+0x1c8/0x300
 iommufd_fops_release+0x174/0x370
 __fput+0x44c/0xa70
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xec/0x130
 do_syscall_64+0x2bd/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4a1d38ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc11ab6e18 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 000000000001b339 RCX: 00007f4a1d38ebe9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f4a1d5c7da0 R08: 0000000000000001 R09: 0000001011ab710f
R10: 0000001b31820000 R11: 0000000000000246 R12: 00007f4a1d5c5fac
R13: 00007f4a1d5c5fa0 R14: ffffffffffffffff R15: 00007ffc11ab6f30
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:unpin_user_page_range_dirty_lock+0x63/0x4e0
Code: 45 31 ed 4c 89 74 24 18 4c 89 6c 24 10 49 c1 e5 06 4b 8d 1c 2e 48 83 c3 08 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 ff 3e 1c 00 4d 01 f5 4c 8b 23 4c 89
RSP: 0018:ffffc900046af770 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000008 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffea00010b8037 R09: 1ffffd4000217006
R10: dffffc0000000000 R11: fffff94000217007 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000555590747500(0000) GS:ffff8881a39fa000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32817ff8 CR3: 0000000039736000 CR4: 00000000000006f0
