R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007f65cabb5fa0 R15: 00007ffeded21b78 comedi comedi1: c6xdigio: I/O port conflict (0x8001,3) BUG: unable to handle page fault for address: ffffffff9b3fc110 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD e33b067 P4D e33b067 PUD e33c063 PMD 0 Oops: Oops: 0000 [#1] SMP KASAN PTI CPU: 1 UID: 0 PID: 17928 Comm: syz.1.2931 Not tainted 6.16.0-rc4-next-20250704-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:variable_test_bit arch/x86/include/asm/bitops.h:227 [inline] RIP: 0010:arch_test_bit arch/x86/include/asm/bitops.h:239 [inline] RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:142 [inline] RIP: 0010:__lock_acquire+0x6c1/0xd20 kernel/locking/lockdep.c:5210 Code: b3 00 00 00 4c 89 f6 ba 08 00 00 00 e8 88 25 00 00 45 31 ff 85 c0 0f 84 f5 05 00 00 83 3d d6 51 54 18 00 75 13 48 63 44 24 20 <48> 0f a3 05 67 c2 50 12 0f 83 15 05 00 00 31 ed 48 8b 3c 24 4c 8b RSP: 0018:ffffc90004d07810 EFLAGS: 00010046 RAX: 000000003a87ec9b RBX: ffff888029f5bc00 RCX: ffffffff93999c08 RDX: 0000000000000008 RSI: ffff888029f5c768 RDI: ffff888029f5bc00 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff825fb67d R10: dffffc0000000000 R11: ffffed1003bd6a23 R12: 0000000000000004 R13: 0000000000000004 R14: ffff888029f5c768 R15: 0000000000000000 FS: 00007f65cb87b6c0(0000) GS:ffff8881258af000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff9b3fc110 CR3: 0000000030b30000 CR4: 00000000003526f0 Call Trace: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577 kernfs_remove_by_name_ns+0x3d/0x130 fs/kernfs/dir.c:1712 remove_bind_files drivers/base/bus.c:605 [inline] bus_remove_driver+0x198/0x2f0 drivers/base/bus.c:743 comedi_device_detach+0x134/0x720 drivers/comedi/drivers.c:207 comedi_device_attach+0x568/0x670 drivers/comedi/drivers.c:1000 do_devconfig_ioctl drivers/comedi/comedi_fops.c:855 [inline] comedi_unlocked_ioctl+0x686/0xf40 drivers/comedi/comedi_fops.c:2136 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl+0xf9/0x170 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: 0033:0x7f65ca98e929 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:00007f65cb87b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f65cabb5fa0 RCX: 00007f65ca98e929 RDX: 0000200000000100 RSI: 0000000040946400 RDI: 0000000000000003 RBP: 00007f65cb87b090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007f65cabb5fa0 R15: 00007ffeded21b78 Modules linked in: CR2: ffffffff9b3fc110 ---[ end trace 0000000000000000 ]--- RIP: 0010:variable_test_bit arch/x86/include/asm/bitops.h:227 [inline] RIP: 0010:arch_test_bit arch/x86/include/asm/bitops.h:239 [inline] RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:142 [inline] RIP: 0010:__lock_acquire+0x6c1/0xd20 kernel/locking/lockdep.c:5210 Code: b3 00 00 00 4c 89 f6 ba 08 00 00 00 e8 88 25 00 00 45 31 ff 85 c0 0f 84 f5 05 00 00 83 3d d6 51 54 18 00 75 13 48 63 44 24 20 <48> 0f a3 05 67 c2 50 12 0f 83 15 05 00 00 31 ed 48 8b 3c 24 4c 8b RSP: 0018:ffffc90004d07810 EFLAGS: 00010046 RAX: 000000003a87ec9b RBX: ffff888029f5bc00 RCX: ffffffff93999c08 RDX: 0000000000000008 RSI: ffff888029f5c768 RDI: ffff888029f5bc00 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff825fb67d R10: dffffc0000000000 R11: ffffed1003bd6a23 R12: 0000000000000004 R13: 0000000000000004 R14: ffff888029f5c768 R15: 0000000000000000 FS: 00007f65cb87b6c0(0000) GS:ffff8881258af000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff9b3fc110 CR3: 0000000030b30000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: b3 00 mov $0x0,%bl 2: 00 00 add %al,(%rax) 4: 4c 89 f6 mov %r14,%rsi 7: ba 08 00 00 00 mov $0x8,%edx c: e8 88 25 00 00 call 0x2599 11: 45 31 ff xor %r15d,%r15d 14: 85 c0 test %eax,%eax 16: 0f 84 f5 05 00 00 je 0x611 1c: 83 3d d6 51 54 18 00 cmpl $0x0,0x185451d6(%rip) # 0x185451f9 23: 75 13 jne 0x38 25: 48 63 44 24 20 movslq 0x20(%rsp),%rax * 2a: 48 0f a3 05 67 c2 50 bt %rax,0x1250c267(%rip) # 0x1250c299 <-- trapping instruction 31: 12 32: 0f 83 15 05 00 00 jae 0x54d 38: 31 ed xor %ebp,%ebp 3a: 48 8b 3c 24 mov (%rsp),%rdi 3e: 4c rex.WR 3f: 8b .byte 0x8b