Oops: general protection fault, probably for non-canonical address 0xdffffc0000000081: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000408-0x000000000000040f] CPU: 1 UID: 0 PID: 6153 Comm: syz.0.16 Not tainted 6.15.0-rc1-syzkaller-g0af2f6be1b42 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:status_show_vhci drivers/usb/usbip/vhci_sysfs.c:80 [inline] RIP: 0010:status_show+0x30f/0x5a0 drivers/usb/usbip/vhci_sysfs.c:160 Code: 03 80 3c 02 00 0f 85 9c 02 00 00 48 8b 9b 88 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bb 08 04 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 7d 02 00 00 4c 8b b3 08 04 00 00 c1 e5 04 41 bc RSP: 0018:ffffc900032b7ad8 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff87959ab8 RDX: 0000000000000081 RSI: ffffffff87959c7e RDI: 0000000000000408 RBP: 000000000000000f R08: 0000000000000005 R09: 0000000000000000 R10: 000000000000000f R11: 64666b636f732020 R12: ffff888031c3002d R13: ffffc900032b7b28 R14: ffff888031c30000 R15: ffff88803024f390 FS: 00007f65760736c0(0000) GS:ffff888124ab9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b3355ffff CR3: 00000000307c6000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: dev_attr_show+0x53/0xe0 drivers/base/core.c:2424 sysfs_kf_seq_show+0x213/0x3e0 fs/sysfs/file.c:65 seq_read_iter+0x506/0x12c0 fs/seq_file.c:230 kernfs_fop_read_iter+0x40f/0x5a0 fs/kernfs/file.c:279 new_sync_read fs/read_write.c:489 [inline] vfs_read+0x8c8/0xc70 fs/read_write.c:570 ksys_read+0x12a/0x240 fs/read_write.c:713 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6575185d29 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:00007f6576073038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007f6575375fa0 RCX: 00007f6575185d29 RDX: 0000000000000062 RSI: 0000000020001080 RDI: 0000000000000003 RBP: 00007f6575201b08 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f6575375fa0 R15: 00007ffecf28f278 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:status_show_vhci drivers/usb/usbip/vhci_sysfs.c:80 [inline] RIP: 0010:status_show+0x30f/0x5a0 drivers/usb/usbip/vhci_sysfs.c:160 Code: 03 80 3c 02 00 0f 85 9c 02 00 00 48 8b 9b 88 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bb 08 04 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 7d 02 00 00 4c 8b b3 08 04 00 00 c1 e5 04 41 bc RSP: 0018:ffffc900032b7ad8 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff87959ab8 RDX: 0000000000000081 RSI: ffffffff87959c7e RDI: 0000000000000408 RBP: 000000000000000f R08: 0000000000000005 R09: 0000000000000000 R10: 000000000000000f R11: 64666b636f732020 R12: ffff888031c3002d R13: ffffc900032b7b28 R14: ffff888031c30000 R15: ffff88803024f390 FS: 00007f65760736c0(0000) GS:ffff8881249b9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055e38320b618 CR3: 00000000307c6000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 03 80 3c 02 00 0f add 0xf00023c(%rax),%eax 6: 85 9c 02 00 00 48 8b test %ebx,-0x74b80000(%rdx,%rax,1) d: 9b fwait e: 88 00 mov %al,(%rax) 10: 00 00 add %al,(%rax) 12: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 19: fc ff df 1c: 48 8d bb 08 04 00 00 lea 0x408(%rbx),%rdi 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 7d 02 00 00 jne 0x2b1 34: 4c 8b b3 08 04 00 00 mov 0x408(%rbx),%r14 3b: c1 e5 04 shl $0x4,%ebp 3e: 41 rex.B 3f: bc .byte 0xbc