------------[ cut here ]------------
remove_proc_entry: removing non-empty directory 'irq/20', leaking at least 'comedi_parport'
WARNING: fs/proc/generic.c:747 at remove_proc_entry+0x4e7/0x610 fs/proc/generic.c:747, CPU#0: syz.4.1499/11162
Modules linked in:
CPU: 0 UID: 0 PID: 11162 Comm: syz.4.1499 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:remove_proc_entry+0x4f5/0x610 fs/proc/generic.c:747
Code: 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 c7 00 00 00 48 8d 3d 89 bc 8b 0e 49 8b 95 d0 00 00 00 48 c7 c6 40 2d 0b 8c <67> 48 0f b9 3a e9 2a fe ff ff e8 bc 5d 4b ff 48 8d 7d 18 48 b8 00
RSP: 0018:ffffc900075ff6a0 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: dffffc0000000000 RCX: ffff88806b62271c
RDX: ffff88801d3de5dc RSI: ffffffff8c0b2d40 RDI: ffffffff914adf00
RBP: ffff88806b6226f8 R08: ffff8880764f821c R09: ffffed100d6c44cb
R10: ffff88806b62265b R11: 0000000000000000 R12: ffff88806b622640
R13: ffff88801d3de500 R14: ffff8880764f81f8 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888096982000(0063) knlGS:00000000f53e6b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000312fcff8 CR3: 000000006b825000 CR4: 0000000000352ef0
DR0: ffffffffffffffff DR1: 08000000000001f8 DR2: 0000000000000000
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 unregister_irq_proc+0x206/0x2a0 kernel/irq/proc.c:406
 free_desc+0x89/0x330 kernel/irq/irqdesc.c:482
 irq_free_descs kernel/irq/irqdesc.c:874 [inline]
 irq_free_descs+0x84/0xc0 kernel/irq/irqdesc.c:865
 irq_domain_free_irqs+0x46a/0x5c0 kernel/irq/irqdomain.c:1919
 mp_unmap_irq+0xf8/0x130 arch/x86/kernel/apic/io_apic.c:1061
 acpi_unregister_gsi_ioapic+0x40/0x60 arch/x86/kernel/acpi/boot.c:722
 acpi_unregister_gsi+0x25/0x40 arch/x86/kernel/acpi/boot.c:751
 acpi_pci_irq_disable+0x275/0x360 drivers/acpi/pci_irq.c:517
 pcibios_disable_device arch/x86/pci/common.c:706 [inline]
 pcibios_disable_device+0x89/0xb0 arch/x86/pci/common.c:703
 do_pci_disable_device+0x9f/0x100 drivers/pci/pci.c:2203
 pci_disable_device+0x130/0x270 drivers/pci/pci.c:2239
 pci_device_remove+0xb2/0x1d0 drivers/pci/pci-driver.c:535
 device_remove+0xcb/0x180 drivers/base/dd.c:616
 __device_release_driver drivers/base/dd.c:1349 [inline]
 device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
 pci_stop_dev drivers/pci/remove.c:27 [inline]
 pci_stop_bus_device+0x120/0x160 drivers/pci/remove.c:94
 pci_stop_and_remove_bus_device+0x58/0xa0 drivers/pci/remove.c:129
 pci_stop_and_remove_bus_device_locked+0x1a/0x20 drivers/pci/remove.c:137
 remove_store+0x123/0x140 drivers/pci/pci-sysfs.c:524
 dev_attr_store+0x58/0x80 drivers/base/core.c:2509
 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+0x6af/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:79 [inline]
 __do_fast_syscall_32+0x13a/0x8b0 arch/x86/entry/syscall_32.c:291
 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:316
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7f28fec
Code: Unable to access opcode bytes at 0xf7f28fc2.
RSP: 002b:00000000f53e650c EFLAGS: 00000292 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 000000000000000a RCX: 0000000080000400
RDX: 00000000fffffe81 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess):
   0:	00 fc                	add    %bh,%ah
   2:	ff                   	lcall  (bad)
   3:	df 48 89             	fisttps -0x77(%rax)
   6:	fa                   	cli
   7:	48 c1 ea 03          	shr    $0x3,%rdx
   b:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   f:	0f 85 c7 00 00 00    	jne    0xdc
  15:	48 8d 3d 89 bc 8b 0e 	lea    0xe8bbc89(%rip),%rdi        # 0xe8bbca5
  1c:	49 8b 95 d0 00 00 00 	mov    0xd0(%r13),%rdx
  23:	48 c7 c6 40 2d 0b 8c 	mov    $0xffffffff8c0b2d40,%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	e9 2a fe ff ff       	jmp    0xfffffe5e
  34:	e8 bc 5d 4b ff       	call   0xff4b5df5
  39:	48 8d 7d 18          	lea    0x18(%rbp),%rdi
  3d:	48                   	rex.W
  3e:	b8                   	.byte 0xb8