general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 PID: 2665 Comm: syz.0.627 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 RIP: 0010:dummy_udc_start+0xbb/0x1d0 drivers/usb/gadget/udc/dummy_hcd.c:1000 Code: 00 00 ff 24 c5 40 20 7c 85 e8 41 0f 40 fe eb 13 e8 3a 0f 40 fe eb 0c e8 33 0f 40 fe eb 05 e8 2c 0f 40 fe 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 86 7e 7f fe 4d 8b 36 4c 89 f7 e8 RSP: 0018:ffffc90000bb7aa8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888128344010 RCX: 0000000000080000 RDX: ffffc90001769000 RSI: 000000000000064e RDI: 000000000000064f RBP: ffffc90000bb7ad0 R08: ffff8881158d8000 R09: 0000000000000004 R10: 0000000000000005 R11: 0000000000000002 R12: dffffc0000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000003 FS: 00007f74f4a8c6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f74f6481000 CR3: 0000000110b8a000 CR4: 00000000003506a0 Call Trace: usb_gadget_udc_start drivers/usb/gadget/udc/core.c:1122 [inline] udc_bind_to_driver+0x2af/0x770 drivers/usb/gadget/udc/core.c:1514 usb_gadget_probe_driver+0x1fc/0x380 drivers/usb/gadget/udc/core.c:1589 raw_ioctl_run drivers/usb/gadget/legacy/raw_gadget.c:549 [inline] raw_ioctl+0x114d/0x3040 drivers/usb/gadget/legacy/raw_gadget.c:1256 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0x121/0x1a0 fs/ioctl.c:860 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:860 x64_sys_call+0x2f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:17 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f74f6497b2b Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00 RSP: 002b:00007f74f4a89f00 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 00007f74f6497b2b RDX: 0000000000000000 RSI: 0000000000005501 RDI: 0000000000000007 RBP: 00007f74f4a8afd0 R08: 0000000000000001 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000200000000040 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace d6378ece186c4036 ]--- RIP: 0010:dummy_udc_start+0xbb/0x1d0 drivers/usb/gadget/udc/dummy_hcd.c:1000 Code: 00 00 ff 24 c5 40 20 7c 85 e8 41 0f 40 fe eb 13 e8 3a 0f 40 fe eb 0c e8 33 0f 40 fe eb 05 e8 2c 0f 40 fe 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 86 7e 7f fe 4d 8b 36 4c 89 f7 e8 RSP: 0018:ffffc90000bb7aa8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888128344010 RCX: 0000000000080000 RDX: ffffc90001769000 RSI: 000000000000064e RDI: 000000000000064f RBP: ffffc90000bb7ad0 R08: ffff8881158d8000 R09: 0000000000000004 R10: 0000000000000005 R11: 0000000000000002 R12: dffffc0000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000003 FS: 00007f74f4a8c6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f53613762f8 CR3: 0000000110b8a000 CR4: 00000000003506a0 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: ff 24 c5 40 20 7c 85 jmp *-0x7a83dfc0(,%rax,8) 9: e8 41 0f 40 fe call 0xfe400f4f e: eb 13 jmp 0x23 10: e8 3a 0f 40 fe call 0xfe400f4f 15: eb 0c jmp 0x23 17: e8 33 0f 40 fe call 0xfe400f4f 1c: eb 05 jmp 0x23 1e: e8 2c 0f 40 fe call 0xfe400f4f 23: 4c 89 f0 mov %r14,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 f7 mov %r14,%rdi 34: e8 86 7e 7f fe call 0xfe7f7ebf 39: 4d 8b 36 mov (%r14),%r14 3c: 4c 89 f7 mov %r14,%rdi 3f: e8 .byte 0xe8