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: 7593 Comm: syz.0.466 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 RIP: 0010:dummy_udc_start+0xb7/0x1d0 drivers/usb/gadget/udc/dummy_hcd.c:1003 Code: 00 00 ff 24 c5 60 e9 3e 8b e8 15 83 02 fb eb 13 e8 0e 83 02 fb eb 0c e8 07 83 02 fb eb 05 e8 00 83 02 fb 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 aa af 53 fb 4d 8b 36 4c 89 f7 e8 RSP: 0018:ffffc9000dcbf850 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88807ace4050 RCX: 0000000000080000 RDX: ffffc900058b9000 RSI: 0000000000001ec5 RDI: 0000000000001ec6 RBP: ffff888146bc8000 R08: ffff8880278b0000 R09: 0000000000000004 R10: 0000000000000005 R11: 0000000000000002 R12: dffffc0000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000003 FS: 00007f83ea9f66c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f83ec787000 CR3: 000000002a07d000 CR4: 00000000003506e0 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:1227 [inline] gadget_bind_driver+0x38c/0x760 drivers/usb/gadget/udc/core.c:1656 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x24a/0xb40 drivers/base/dd.c:638 __driver_probe_device+0x1f5/0x390 drivers/base/dd.c:804 driver_probe_device+0x4f/0x420 drivers/base/dd.c:834 __driver_attach+0x43d/0x6c0 drivers/base/dd.c:1220 bus_for_each_dev+0x182/0x1f0 drivers/base/bus.c:303 bus_add_driver+0x324/0x5d0 drivers/base/bus.c:620 driver_register+0x32d/0x430 drivers/base/driver.c:246 usb_gadget_register_driver_owner+0xf5/0x260 drivers/usb/gadget/udc/core.c:1730 raw_ioctl_run drivers/usb/gadget/legacy/raw_gadget.c:549 [inline] raw_ioctl+0x13a0/0x3cd0 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+0xfa/0x170 fs/ioctl.c:856 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: 0033:0x7f83ec79db2b 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:00007f83ea9f3f00 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f83ec79db2b RDX: 0000000000000000 RSI: 0000000000005501 RDI: 0000000000000003 RBP: 00007f83ea9f4fd0 R08: 0000000000000001 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000200000000500 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:dummy_udc_start+0xb7/0x1d0 drivers/usb/gadget/udc/dummy_hcd.c:1003 Code: 00 00 ff 24 c5 60 e9 3e 8b e8 15 83 02 fb eb 13 e8 0e 83 02 fb eb 0c e8 07 83 02 fb eb 05 e8 00 83 02 fb 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 aa af 53 fb 4d 8b 36 4c 89 f7 e8 RSP: 0018:ffffc9000dcbf850 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88807ace4050 RCX: 0000000000080000 RDX: ffffc900058b9000 RSI: 0000000000001ec5 RDI: 0000000000001ec6 RBP: ffff888146bc8000 R08: ffff8880278b0000 R09: 0000000000000004 R10: 0000000000000005 R11: 0000000000000002 R12: dffffc0000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000003 FS: 00007f83ea9f66c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055f71dc47250 CR3: 000000002a07d000 CR4: 00000000003506e0 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 60 e9 3e 8b jmp *-0x74c116a0(,%rax,8) 9: e8 15 83 02 fb call 0xfb028323 e: eb 13 jmp 0x23 10: e8 0e 83 02 fb call 0xfb028323 15: eb 0c jmp 0x23 17: e8 07 83 02 fb call 0xfb028323 1c: eb 05 jmp 0x23 1e: e8 00 83 02 fb call 0xfb028323 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 aa af 53 fb call 0xfb53afe3 39: 4d 8b 36 mov (%r14),%r14 3c: 4c 89 f7 mov %r14,%rdi 3f: e8 .byte 0xe8