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: 529 Comm: syz.1.71 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 RIP: 0010:set_link_state+0x2a/0x1230 drivers/usb/gadget/udc/dummy_hcd.c:435 Code: 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 60 49 89 fd 48 bb 00 00 00 00 00 fc ff df e8 4d fb 24 fe 4c 89 e8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ef e8 e8 85 6a fe 4d 8b 75 00 49 8d 95 9b RSP: 0018:ffffc9000e7df6e8 EFLAGS: 00010046 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000080000 RDX: ffffc900012a9000 RSI: 0000000000000c95 RDI: 0000000000000c96 RBP: ffffc9000e7df770 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff52001cfbedc R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffff88810de98000 FS: 00007ff91bba36c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c3235d9 CR3: 00000001182e3000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: dummy_pullup+0xcd/0x130 drivers/usb/gadget/udc/dummy_hcd.c:914 usb_gadget_disconnect_locked+0x14c/0x3f0 drivers/usb/gadget/udc/core.c:758 gadget_unbind_driver+0xab/0x3d0 drivers/usb/gadget/udc/core.c:1679 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 device_release_driver+0x19/0x20 drivers/base/dd.c:1332 bus_remove_device+0x2f0/0x350 drivers/base/bus.c:531 device_del+0x63c/0xe50 drivers/base/core.c:3886 usb_del_gadget+0x1b7/0x270 drivers/usb/gadget/udc/core.c:1552 usb_del_gadget_udc+0x15/0x30 drivers/usb/gadget/udc/core.c:1575 dummy_udc_remove+0x58/0x60 drivers/usb/gadget/udc/dummy_hcd.c:1123 platform_remove+0xb8/0x110 drivers/base/platform.c:1422 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 device_driver_detach+0x3b/0x40 drivers/base/dd.c:1345 unbind_store+0x2e5/0x300 drivers/base/bus.c:193 drv_attr_store+0x88/0xb0 drivers/base/bus.c:77 sysfs_kf_write+0x137/0x150 fs/sysfs/file.c:136 kernfs_fop_write_iter+0x307/0x470 fs/kernfs/file.c:352 call_write_iter include/linux/fs.h:2282 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x5ef/0xd00 fs/read_write.c:584 ksys_write+0x14a/0x260 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:646 x64_sys_call+0x27b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2 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: 0033:0x7ff91ad9de99 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff91bba3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ff91b025fa0 RCX: 00007ff91ad9de99 RDX: 000000000000000b RSI: 0000200000000400 RDI: 0000000000000003 RBP: 00007ff91ae33eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff91b026038 R14: 00007ff91b025fa0 R15: 00007ffe62d8e098 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:set_link_state+0x2a/0x1230 drivers/usb/gadget/udc/dummy_hcd.c:435 Code: 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 60 49 89 fd 48 bb 00 00 00 00 00 fc ff df e8 4d fb 24 fe 4c 89 e8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ef e8 e8 85 6a fe 4d 8b 75 00 49 8d 95 9b RSP: 0018:ffffc9000e7df6e8 EFLAGS: 00010046 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000080000 RDX: ffffc900012a9000 RSI: 0000000000000c95 RDI: 0000000000000c96 RBP: ffffc9000e7df770 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff52001cfbedc R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffff88810de98000 FS: 00007ff91bba36c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c3235d9 CR3: 00000001182e3000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 55 push %rbp 1: 48 89 e5 mov %rsp,%rbp 4: 41 57 push %r15 6: 41 56 push %r14 8: 41 55 push %r13 a: 41 54 push %r12 c: 53 push %rbx d: 48 83 ec 60 sub $0x60,%rsp 11: 49 89 fd mov %rdi,%r13 14: 48 bb 00 00 00 00 00 movabs $0xdffffc0000000000,%rbx 1b: fc ff df 1e: e8 4d fb 24 fe call 0xfe24fb70 23: 4c 89 e8 mov %r13,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 ef mov %r13,%rdi 33: e8 e8 85 6a fe call 0xfe6a8620 38: 4d 8b 75 00 mov 0x0(%r13),%r14 3c: 49 rex.WB 3d: 8d .byte 0x8d 3e: 95 xchg %eax,%ebp 3f: 9b fwait