Re: [syzbot] [kernel?] WARNING: proc registration bug in unregister_irq_proc (2)

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit:    818bebeb63dd drm/xe: Don't hand out the flat CCS storage a..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=17569625580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ccca94d2c01b9e78
dashboard link: https://syzkaller.appspot.com/bug?extid=690d666eb12fca6e1e61
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=157ce979580000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+690d666eb12fca6e1e61@xxxxxxxxxxxxxxxxxxxxxxxxx

------------[ cut here ]------------
remove_proc_entry: removing non-empty directory 'irq/17', 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-executor143/6008
Modules linked in:
CPU: 0 UID: 0 PID: 6008 Comm: syz-executor143 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: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 39 b7 88 0e 49 8b 95 d0 00 00 00 48 c7 c6 80 39 0b 8c <67> 48 0f b9 3a e9 2a fe ff ff e8 4c 2b 4a ff 48 8d 7d 18 48 b8 00
RSP: 0018:ffffc900032af7b8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: dffffc0000000000 RCX: ffff88803dac74dc
RDX: ffff88801cb025dc RSI: ffffffff8c0b3980 RDI: ffffffff91498da0
RBP: ffff88803dac74b8 R08: ffff88802b20f75c R09: ffffed1007b58e83
R10: ffff88803dac741b R11: 0000000000000000 R12: ffff88803dac7400
R13: ffff88801cb02500 R14: ffff88802b20f738 R15: dffffc0000000000
FS:  000055558ac37400(0000) GS:ffff8880d5ba2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efe6b5a6130 CR3: 000000002bb43000 CR4: 0000000000352ef0
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:2192
 pci_disable_device+0x130/0x270 drivers/pci/pci.c:2228
 enable_store+0x219/0x260 drivers/pci/pci-sysfs.c:342
 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_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8d19fda9f7
Code: 48 89 fa 4c 89 df e8 98 1d 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffff688d7b0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000055558ac37400 RCX: 00007f8d19fda9f7
RDX: 0000000000000002 RSI: 00007f8d1a0120f4 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00007f8d1a012129
R13: 00007f8d1a014458 R14: 00007f8d1a0120f4 R15: 0000000000000015
 </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 39 b7 88 0e 	lea    0xe88b739(%rip),%rdi        # 0xe88b755
  1c:	49 8b 95 d0 00 00 00 	mov    0xd0(%r13),%rdx
  23:	48 c7 c6 80 39 0b 8c 	mov    $0xffffffff8c0b3980,%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	e9 2a fe ff ff       	jmp    0xfffffe5e
  34:	e8 4c 2b 4a ff       	call   0xff4a2b85
  39:	48 8d 7d 18          	lea    0x18(%rbp),%rdi
  3d:	48                   	rex.W
  3e:	b8                   	.byte 0xb8


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