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: 3750 Comm: syz.0.1088 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:dummy_udc_stop+0x7e/0x330 drivers/usb/gadget/udc/dummy_hcd.c:1034 Code: 4d 8d bc c7 e0 04 00 00 4c 89 f8 48 c1 e8 03 80 3c 18 00 49 89 de 74 08 4c 89 ff e8 1c 8b 6a fe 49 8b 1f 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 03 8b 6a fe 48 8b 1b 48 89 df e8 RSP: 0018:ffffc9000512f608 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888142ed6540 RSI: 0000000000000003 RDI: 0000000000000005 RBP: ffffc9000512f660 R08: ffffc9000512f5e7 R09: 1ffff92000a25ebc R10: 0000000000000000 R11: ffffffff834c6560 R12: ffff88810dc98c90 R13: ffffffff85e37148 R14: dffffc0000000000 R15: ffff88810dc99170 FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f75ba882000 CR3: 00000001437af000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: usb_gadget_udc_stop_locked drivers/usb/gadget/udc/core.c:1254 [inline] gadget_unbind_driver+0x28c/0x3d0 drivers/usb/gadget/udc/core.c:1688 device_remove drivers/base/dd.c:548 [inline] __device_release_driver drivers/base/dd.c:1283 [inline] device_release_driver_internal+0x486/0x7e0 drivers/base/dd.c:1309 driver_detach+0x1f1/0x2d0 drivers/base/dd.c:1372 bus_remove_driver+0x121/0x1d0 drivers/base/bus.c:679 driver_unregister+0x75/0xa0 drivers/base/driver.c:274 usb_gadget_unregister_driver+0x4e/0x70 drivers/usb/gadget/udc/core.c:1745 raw_release+0xda/0x260 drivers/usb/gadget/legacy/raw_gadget.c:416 __fput+0x1fd/0x8f0 fs/file_table.c:320 ____fput+0x15/0x20 fs/file_table.c:348 task_work_run+0x1e1/0x250 kernel/task_work.c:203 exit_task_work include/linux/task_work.h:39 [inline] do_exit+0xaf2/0x2850 kernel/exit.c:887 do_group_exit+0x21b/0x2e0 kernel/exit.c:1030 get_signal+0x167c/0x1700 kernel/signal.c:2895 arch_do_signal_or_restart+0xd1/0x11c0 arch/x86/kernel/signal.c:871 exit_to_user_mode_loop+0x7a/0xb0 kernel/entry/common.c:174 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fadc219dd6b Code: Unable to access opcode bytes at 0x7fadc219dd41. RSP: 002b:00007fadc3060f00 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: fffffffffffffffc RBX: 0000000000000004 RCX: 00007fadc219dd6b RDX: 00007fadc3061fd0 RSI: 0000000080085502 RDI: 0000000000000004 RBP: 00007fadc3061fd0 R08: 0000000000000001 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000246 R12: 0000000080085502 R13: 0000000800000000 R14: 0000000000000000 R15: 00007fadc2253882 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:dummy_udc_stop+0x7e/0x330 drivers/usb/gadget/udc/dummy_hcd.c:1034 Code: 4d 8d bc c7 e0 04 00 00 4c 89 f8 48 c1 e8 03 80 3c 18 00 49 89 de 74 08 4c 89 ff e8 1c 8b 6a fe 49 8b 1f 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 03 8b 6a fe 48 8b 1b 48 89 df e8 RSP: 0018:ffffc9000512f608 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888142ed6540 RSI: 0000000000000003 RDI: 0000000000000005 RBP: ffffc9000512f660 R08: ffffc9000512f5e7 R09: 1ffff92000a25ebc R10: 0000000000000000 R11: ffffffff834c6560 R12: ffff88810dc98c90 R13: ffffffff85e37148 R14: dffffc0000000000 R15: ffff88810dc99170 FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd7611ef2f8 CR3: 0000000128dbe000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 4d 8d bc c7 e0 04 00 lea 0x4e0(%r15,%rax,8),%r15 7: 00 8: 4c 89 f8 mov %r15,%rax b: 48 c1 e8 03 shr $0x3,%rax f: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) 13: 49 89 de mov %rbx,%r14 16: 74 08 je 0x20 18: 4c 89 ff mov %r15,%rdi 1b: e8 1c 8b 6a fe call 0xfe6a8b3c 20: 49 8b 1f mov (%r15),%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 df mov %rbx,%rdi 34: e8 03 8b 6a fe call 0xfe6a8b3c 39: 48 8b 1b mov (%rbx),%rbx 3c: 48 89 df mov %rbx,%rdi 3f: e8 .byte 0xe8