comedi comedi2: c6xdigio: I/O port conflict (0x4f27,3) Oops: general protection fault, probably for non-canonical address 0xdffffc0000000031: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000188-0x000000000000018f] CPU: 1 UID: 0 PID: 26564 Comm: syz.1.6948 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:kasan_byte_accessible+0x15/0x30 mm/kasan/generic.c:199 Code: 00 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 48 b8 00 00 00 00 00 fc ff df 48 c1 ef 03 48 01 c7 <0f> b6 07 3c 07 0f 96 c0 e9 fe 0e 75 09 66 66 2e 0f 1f 84 00 00 00 RSP: 0018:ffffc9000399f818 EFLAGS: 00010282 RAX: dffffc0000000000 RBX: 0000000000000188 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8b95bcb2 RDI: dffffc0000000031 RBP: 0000000000000188 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8b95bcb2 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f5a66eed6c0(0000) GS:ffff8880d67b8000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c30cc01 CR3: 000000005a171000 CR4: 0000000000352ef0 Call Trace: __kasan_check_byte+0x13/0x50 mm/kasan/common.c:567 kasan_check_byte include/linux/kasan.h:399 [inline] lock_acquire kernel/locking/lockdep.c:5842 [inline] lock_acquire+0xfc/0x350 kernel/locking/lockdep.c:5825 down_write+0x92/0x200 kernel/locking/rwsem.c:1590 kernfs_remove_by_name_ns+0x3d/0x110 fs/kernfs/dir.c:1712 sysfs_remove_file include/linux/sysfs.h:777 [inline] driver_remove_file drivers/base/driver.c:201 [inline] driver_remove_file+0x4a/0x60 drivers/base/driver.c:197 remove_bind_files drivers/base/bus.c:605 [inline] bus_remove_driver+0x224/0x2c0 drivers/base/bus.c:743 driver_unregister+0x76/0xb0 drivers/base/driver.c:277 comedi_device_detach_locked+0x12f/0xa50 drivers/comedi/drivers.c:207 comedi_device_detach+0x67/0xb0 drivers/comedi/drivers.c:215 comedi_device_attach+0x43d/0x900 drivers/comedi/drivers.c:1011 do_devconfig_ioctl+0x1b1/0x710 drivers/comedi/comedi_fops.c:872 comedi_unlocked_ioctl+0x165d/0x2f00 drivers/comedi/comedi_fops.c:2178 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl fs/ioctl.c:584 [inline] __x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:584 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5a65f8ebe9 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:00007f5a66eed038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f5a661c5fa0 RCX: 00007f5a65f8ebe9 RDX: 0000200000000180 RSI: 0000000040946400 RDI: 0000000000000003 RBP: 00007f5a66011e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5a661c6038 R14: 00007f5a661c5fa0 R15: 00007ffe5951c8a8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:kasan_byte_accessible+0x15/0x30 mm/kasan/generic.c:199 Code: 00 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 48 b8 00 00 00 00 00 fc ff df 48 c1 ef 03 48 01 c7 <0f> b6 07 3c 07 0f 96 c0 e9 fe 0e 75 09 66 66 2e 0f 1f 84 00 00 00 RSP: 0018:ffffc9000399f818 EFLAGS: 00010282 RAX: dffffc0000000000 RBX: 0000000000000188 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8b95bcb2 RDI: dffffc0000000031 RBP: 0000000000000188 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8b95bcb2 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f5a66eed6c0(0000) GS:ffff8880d68b8000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5a65f729a0 CR3: 000000005a171000 CR4: 0000000000352ef0 DR0: 0000000100000000 DR1: 0000000000001000 DR2: 0000000000000009 DR3: 0000000000000800 DR6: 00000000ffff0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 0f 1f 00 nopl (%rax) 5: 90 nop 6: 90 nop 7: 90 nop 8: 90 nop 9: 90 nop a: 90 nop b: 90 nop c: 90 nop d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 66 0f 1f 00 nopw (%rax) 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 48 c1 ef 03 shr $0x3,%rdi 27: 48 01 c7 add %rax,%rdi * 2a: 0f b6 07 movzbl (%rdi),%eax <-- trapping instruction 2d: 3c 07 cmp $0x7,%al 2f: 0f 96 c0 setbe %al 32: e9 fe 0e 75 09 jmp 0x9750f35 37: 66 data16 38: 66 data16 39: 2e cs 3a: 0f .byte 0xf 3b: 1f (bad) 3c: 84 00 test %al,(%rax)