comedi comedi3: pcl818: I/O port conflict (0x4f27,16) Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f] CPU: 1 UID: 0 PID: 25536 Comm: syz.2.7976 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:pcl818_ai_cancel+0x69/0x3f0 drivers/comedi/drivers/pcl818.c:762 Code: 8b 1b 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 a9 1b 36 f9 48 8b 03 48 89 04 24 49 83 c4 28 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 88 1b 36 f9 4d 8b 24 24 48 83 c3 RSP: 0018:ffffc9000b2879f8 EFLAGS: 00010216 RAX: 0000000000000005 RBX: ffff888025558100 RCX: 0000000000080000 RDX: ffffc9000c5ab000 RSI: 00000000000038c7 RDI: 00000000000038c8 RBP: 0000000000000001 R08: ffff88802e97d92f R09: 1ffff11005d2fb25 R10: dffffc0000000000 R11: ffffffff88ecd870 R12: 0000000000000028 R13: dffffc0000000000 R14: ffff88802e97d800 R15: dffffc0000000000 FS: 00007f14ee79d6c0(0000) GS:ffff888125d1b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fcab43fa000 CR3: 000000004798d000 CR4: 0000000000350ef0 Call Trace: pcl818_detach+0x66/0xd0 drivers/comedi/drivers/pcl818.c:1115 comedi_device_detach_locked+0x178/0x750 drivers/comedi/drivers.c:207 comedi_device_detach drivers/comedi/drivers.c:215 [inline] comedi_device_attach+0x5d4/0x720 drivers/comedi/drivers.c:1011 do_devconfig_ioctl drivers/comedi/comedi_fops.c:872 [inline] comedi_unlocked_ioctl+0x5ff/0x1020 drivers/comedi/comedi_fops.c:2178 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:584 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f14ed98ebe9 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:00007f14ee79d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f14edbb5fa0 RCX: 00007f14ed98ebe9 RDX: 00002000000000c0 RSI: 0000000040946400 RDI: 0000000000000003 RBP: 00007f14eda11e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f14edbb6038 R14: 00007f14edbb5fa0 R15: 00007ffdaadd40a8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:pcl818_ai_cancel+0x69/0x3f0 drivers/comedi/drivers/pcl818.c:762 Code: 8b 1b 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 a9 1b 36 f9 48 8b 03 48 89 04 24 49 83 c4 28 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 88 1b 36 f9 4d 8b 24 24 48 83 c3 RSP: 0018:ffffc9000b2879f8 EFLAGS: 00010216 RAX: 0000000000000005 RBX: ffff888025558100 RCX: 0000000000080000 RDX: ffffc9000c5ab000 RSI: 00000000000038c7 RDI: 00000000000038c8 RBP: 0000000000000001 R08: ffff88802e97d92f R09: 1ffff11005d2fb25 R10: dffffc0000000000 R11: ffffffff88ecd870 R12: 0000000000000028 R13: dffffc0000000000 R14: ffff88802e97d800 R15: dffffc0000000000 FS: 00007f14ee79d6c0(0000) GS:ffff888125c1b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb72707a286 CR3: 000000004798d000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: 8b 1b mov (%rbx),%ebx 2: 48 89 d8 mov %rbx,%rax 5: 48 c1 e8 03 shr $0x3,%rax 9: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) e: 74 08 je 0x18 10: 48 89 df mov %rbx,%rdi 13: e8 a9 1b 36 f9 call 0xf9361bc1 18: 48 8b 03 mov (%rbx),%rax 1b: 48 89 04 24 mov %rax,(%rsp) 1f: 49 83 c4 28 add $0x28,%r12 23: 4c 89 e0 mov %r12,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 e7 mov %r12,%rdi 34: e8 88 1b 36 f9 call 0xf9361bc1 39: 4d 8b 24 24 mov (%r12),%r12 3d: 48 rex.W 3e: 83 .byte 0x83 3f: c3 ret