------------[ 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#1: syz.5.987/9505 Modules linked in: CPU: 1 UID: 0 PID: 9505 Comm: syz.5.987 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 e9 5f 6c 0e 49 8b 95 d0 00 00 00 48 c7 c6 40 00 ea 8b <67> 48 0f b9 3a e9 2a fe ff ff e8 0c ca 4d ff 48 8d 7d 18 48 b8 00 RSP: 0018:ffffc900038ef780 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: dffffc0000000000 RCX: ffff88803d4ff11c RDX: ffff88801c3a45dc RSI: ffffffff8bea0040 RDI: ffffffff9128f260 RBP: ffff88803d4ff0f8 R08: ffff888034f9cc1c R09: ffffed1007a9fe0b R10: ffff88803d4ff05b R11: 0000000000000000 R12: ffff88803d4ff040 R13: ffff88801c3a4500 R14: ffff888034f9cbf8 R15: dffffc0000000000 FS: 00007f90b99b26c0(0000) GS:ffff8880d5ede000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000009de80 CR3: 00000000224db000 CR4: 0000000000352ef0 DR0: 0000000000000008 DR1: 0000000000000002 DR2: 0000000000000404 DR3: ffffffffefffff14 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: 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:1917 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:2170 pci_disable_device+0x130/0x270 drivers/pci/pci.c:2206 pci_device_remove+0xb2/0x1d0 drivers/pci/pci-driver.c:512 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 unbind_store+0xf8/0x110 drivers/base/bus.c:244 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_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f90bbb9de99 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f90b99b2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f90bbe26270 RCX: 00007f90bbb9de99 RDX: 000000000000000d RSI: 0000200000000d00 RDI: 0000000000000005 RBP: 00007f90bbc33eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f90bbe26308 R14: 00007f90bbe26270 R15: 00007ffcc7b32d78 ---------------- 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 e9 5f 6c 0e lea 0xe6c5fe9(%rip),%rdi # 0xe6c6005 1c: 49 8b 95 d0 00 00 00 mov 0xd0(%r13),%rdx 23: 48 c7 c6 40 00 ea 8b mov $0xffffffff8bea0040,%rsi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: e9 2a fe ff ff jmp 0xfffffe5e 34: e8 0c ca 4d ff call 0xff4dca45 39: 48 8d 7d 18 lea 0x18(%rbp),%rdi 3d: 48 rex.W 3e: b8 .byte 0xb8