comedi comedi3: pcl818: I/O port conflict (0xfffffffffffffffb,16)
general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 0 PID: 4412 Comm: syz.0.16 Not tainted 6.1.143-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:pcl818_ai_cancel+0x65/0x3e0 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 cd 99 16 fa 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 ac 99 16 fa 4d 8b 24 24 48 83 c3
RSP: 0018:ffffc90003497a10 EFLAGS: 00010206
RAX: 0000000000000005 RBX: ffff888079777800 RCX: ffff8880290c8000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88814cfc9800
RBP: 0000000000000001 R08: dffffc0000000000 R09: ffffed10299f9326
R10: ffffed10299f9326 R11: 1ffff110299f9325 R12: 0000000000000028
R13: dffffc0000000000 R14: ffff88814cfc9800 R15: dffffc0000000000
FS: 0000555582f7c500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2bf5ffff CR3: 0000000028193000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
pcl818_detach+0x62/0xd0 drivers/comedi/drivers/pcl818.c:1115
comedi_device_detach+0x12d/0x6e0 drivers/comedi/drivers.c:206
comedi_device_attach+0x55d/0x650 drivers/comedi/drivers.c:999
do_devconfig_ioctl drivers/comedi/comedi_fops.c:851 [inline]
comedi_unlocked_ioctl+0x5ec/0xe90 drivers/comedi/comedi_fops.c:2131
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f802638e929
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:00007ffd67df3198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f80265b5fa0 RCX: 00007f802638e929
RDX: 0000200000000140 RSI: 0000000040946400 RDI: 0000000000000003
RBP: 00007f8026410b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f80265b5fa0 R14: 00007f80265b5fa0 R15: 0000000000000003
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:pcl818_ai_cancel+0x65/0x3e0 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 cd 99 16 fa 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 ac 99 16 fa 4d 8b 24 24 48 83 c3
RSP: 0018:ffffc90003497a10 EFLAGS: 00010206
RAX: 0000000000000005 RBX: ffff888079777800 RCX: ffff8880290c8000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88814cfc9800
RBP: 0000000000000001 R08: dffffc0000000000 R09: ffffed10299f9326
R10: ffffed10299f9326 R11: 1ffff110299f9325 R12: 0000000000000028
R13: dffffc0000000000 R14: ffff88814cfc9800 R15: dffffc0000000000
FS: 0000555582f7c500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005616fa22e030 CR3: 0000000028193000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
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 cd 99 16 fa call 0xfa1699e5
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 ac 99 16 fa call 0xfa1699e5
39: 4d 8b 24 24 mov (%r12),%r12
3d: 48 rex.W
3e: 83 .byte 0x83
3f: c3 ret