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: 943 Comm: syz.0.169 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:1003 Code: 00 00 ff 24 c5 00 6c e3 85 e8 21 02 25 fe eb 13 e8 1a 02 25 fe eb 0c e8 13 02 25 fe eb 05 e8 0c 02 25 fe 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 a6 8c 6a fe 4d 8b 36 4c 89 f7 e8 RSP: 0018:ffffc9000a8a77e8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88811362e010 RCX: 0000000000080000 RDX: ffffc900016fa000 RSI: 0000000000000800 RDI: 0000000000000801 RBP: ffffc9000a8a7810 R08: ffff88811df5a880 R09: 0000000000000004 R10: 0000000000000005 R11: 0000000000000002 R12: dffffc0000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000003 FS: 00007efd030146c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007efd02187000 CR3: 0000000132ca6000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: usb_gadget_udc_start_locked drivers/usb/gadget/udc/core.c:1226 [inline] gadget_bind_driver+0x3c5/0x990 drivers/usb/gadget/udc/core.c:1628 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x2d7/0x9a0 drivers/base/dd.c:639 __driver_probe_device+0x193/0x270 drivers/base/dd.c:808 driver_probe_device+0x54/0x3e0 drivers/base/dd.c:838 __driver_attach+0x41a/0x5d0 drivers/base/dd.c:1224 bus_for_each_dev+0x18c/0x200 drivers/base/bus.c:303 driver_attach+0x42/0x50 drivers/base/dd.c:1241 bus_add_driver+0x322/0x560 drivers/base/bus.c:620 driver_register+0x335/0x440 drivers/base/driver.c:246 usb_gadget_register_driver_owner+0xf8/0x270 drivers/usb/gadget/udc/core.c:1713 raw_ioctl_run drivers/usb/gadget/legacy/raw_gadget.c:549 [inline] raw_ioctl+0x112c/0x3180 drivers/usb/gadget/legacy/raw_gadget.c:1262 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0x12f/0x1b0 fs/ioctl.c:856 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:856 x64_sys_call+0x58b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:17 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7efd0219db2b 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:00007efd03011f00 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007efd0219db2b RDX: 0000000000000000 RSI: 0000000000005501 RDI: 0000000000000003 RBP: 00007efd03012fd0 R08: 0000000000000001 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000200000000340 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:dummy_udc_start+0xbb/0x1d0 drivers/usb/gadget/udc/dummy_hcd.c:1003 Code: 00 00 ff 24 c5 00 6c e3 85 e8 21 02 25 fe eb 13 e8 1a 02 25 fe eb 0c e8 13 02 25 fe eb 05 e8 0c 02 25 fe 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 a6 8c 6a fe 4d 8b 36 4c 89 f7 e8 RSP: 0018:ffffc9000a8a77e8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88811362e010 RCX: 0000000000080000 RDX: ffffc900016fa000 RSI: 0000000000000800 RDI: 0000000000000801 RBP: ffffc9000a8a7810 R08: ffff88811df5a880 R09: 0000000000000004 R10: 0000000000000005 R11: 0000000000000002 R12: dffffc0000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000003 FS: 00007efd030146c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f65e25d6000 CR3: 0000000132ca6000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: ff 24 c5 00 6c e3 85 jmp *-0x7a1c9400(,%rax,8) 9: e8 21 02 25 fe call 0xfe25022f e: eb 13 jmp 0x23 10: e8 1a 02 25 fe call 0xfe25022f 15: eb 0c jmp 0x23 17: e8 13 02 25 fe call 0xfe25022f 1c: eb 05 jmp 0x23 1e: e8 0c 02 25 fe call 0xfe25022f 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 a6 8c 6a fe call 0xfe6a8cdf 39: 4d 8b 36 mov (%r14),%r14 3c: 4c 89 f7 mov %r14,%rdi 3f: e8 .byte 0xe8