BUG: unable to handle page fault for address: ffffc90006519640
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 1bc00067 P4D 1bc00067 PUD 1d293067 PMD 2811b067 PTE 0
Oops: Oops: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5936 Comm: syz.2.15 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:readl arch/x86/include/asm/io.h:59 [inline]
RIP: 0010:ioread32+0x87/0xc0 lib/iomap.c:99
Code: 2d 6e c6 5c 0a 31 ff 89 ee e8 d5 9d e5 fc 85 ed 75 28 e8 5c a3 e5 fc bb ff ff ff ff 89 d8 5b 5d c3 cc cc cc cc e8 49 a3 e5 fc <8b> 1b e8 42 a3 e5 fc 89 d8 5b 5d e9 19 b5 97 06 e8 34 a3 e5 fc 83
RSP: 0000:ffffc9000603f8b8 EFLAGS: 00010283
RAX: 0000000000027b46 RBX: ffffc90006519640 RCX: ffffc900264d9000
RDX: 0000000000080000 RSI: ffffffff85240db7 RDI: ffff888027a12540
RBP: ffff888013c1ac38 R08: 0000000000000007 R09: 000000000003ffff
R10: ffffc90006519640 R11: 0000000000000000 R12: 1ffff92000c07f26
R13: ffff888020fae0d0 R14: ffff888013c1ac80 R15: ffffc9000603f950
FS:  0000000000000000(0000) GS:ffff888096bdf000(0063) knlGS:00000000f540cb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: ffffc90006519640 CR3: 000000006caf7000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 nhi_probe+0xdc/0x8f0 drivers/thunderbolt/nhi.c:1198
 nhi_pci_probe+0x322/0x5a0 drivers/thunderbolt/pci.c:479
 local_pci_probe+0xdd/0x1b0 drivers/pci/pci-driver.c:332
 pci_call_probe+0x176/0x800 drivers/pci/pci-driver.c:394
 __pci_device_probe drivers/pci/pci-driver.c:455 [inline]
 pci_device_probe+0x1cd/0x370 drivers/pci/pci-driver.c:489
 call_driver_probe drivers/base/dd.c:628 [inline]
 really_probe+0x241/0xa60 drivers/base/dd.c:706
 __driver_probe_device+0x20e/0x450 drivers/base/dd.c:868
 device_driver_attach+0xd1/0x220 drivers/base/dd.c:1203
 bind_store+0xf4/0x190 drivers/base/bus.c:267
 drv_attr_store+0x74/0xb0 drivers/base/bus.c:125
 sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
 kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0xe7/0x970 arch/x86/entry/syscall_32.c:307
 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:332
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf703efec
Code: Unable to access opcode bytes at 0xf703efc2.
RSP: 002b:00000000f540c50c EFLAGS: 00000292 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000080000180
RDX: 000000000000000d RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
CR2: ffffc90006519640
---[ end trace 0000000000000000 ]---
RIP: 0010:readl arch/x86/include/asm/io.h:59 [inline]
RIP: 0010:ioread32+0x87/0xc0 lib/iomap.c:99
Code: 2d 6e c6 5c 0a 31 ff 89 ee e8 d5 9d e5 fc 85 ed 75 28 e8 5c a3 e5 fc bb ff ff ff ff 89 d8 5b 5d c3 cc cc cc cc e8 49 a3 e5 fc <8b> 1b e8 42 a3 e5 fc 89 d8 5b 5d e9 19 b5 97 06 e8 34 a3 e5 fc 83
RSP: 0000:ffffc9000603f8b8 EFLAGS: 00010283
RAX: 0000000000027b46 RBX: ffffc90006519640 RCX: ffffc900264d9000
RDX: 0000000000080000 RSI: ffffffff85240db7 RDI: ffff888027a12540
RBP: ffff888013c1ac38 R08: 0000000000000007 R09: 000000000003ffff
R10: ffffc90006519640 R11: 0000000000000000 R12: 1ffff92000c07f26
R13: ffff888020fae0d0 R14: ffff888013c1ac80 R15: ffffc9000603f950
FS:  0000000000000000(0000) GS:ffff888096bdf000(0063) knlGS:00000000f540cb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f703f000 CR3: 000000006caf7000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
   0:	2d 6e c6 5c 0a       	sub    $0xa5cc66e,%eax
   5:	31 ff                	xor    %edi,%edi
   7:	89 ee                	mov    %ebp,%esi
   9:	e8 d5 9d e5 fc       	call   0xfce59de3
   e:	85 ed                	test   %ebp,%ebp
  10:	75 28                	jne    0x3a
  12:	e8 5c a3 e5 fc       	call   0xfce5a373
  17:	bb ff ff ff ff       	mov    $0xffffffff,%ebx
  1c:	89 d8                	mov    %ebx,%eax
  1e:	5b                   	pop    %rbx
  1f:	5d                   	pop    %rbp
  20:	c3                   	ret
  21:	cc                   	int3
  22:	cc                   	int3
  23:	cc                   	int3
  24:	cc                   	int3
  25:	e8 49 a3 e5 fc       	call   0xfce5a373
* 2a:	8b 1b                	mov    (%rbx),%ebx <-- trapping instruction
  2c:	e8 42 a3 e5 fc       	call   0xfce5a373
  31:	89 d8                	mov    %ebx,%eax
  33:	5b                   	pop    %rbx
  34:	5d                   	pop    %rbp
  35:	e9 19 b5 97 06       	jmp    0x697b553
  3a:	e8 34 a3 e5 fc       	call   0xfce5a373
  3f:	83                   	.byte 0x83