list_add double add: new=ffff8880609ff518, prev=ffff8880609ff518, next=ffff8880323ed878.
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:37!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 1 UID: 0 PID: 16950 Comm: syz.9.2289 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:__list_add_valid_or_report+0xa5/0x130 lib/list_debug.c:35
Code: 74 12 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d e9 ed 40 31 fc cc 48 c7 c7 60 e0 4b 8c 4c 89 fe 4c 89 f2 48 89 d9 e8 3c bf 48 fc 90 <0f> 0b 48 c7 c7 40 de 4b 8c e8 2d bf 48 fc 90 0f 0b 48 c7 c7 00 df
RSP: 0018:ffffc9001142f3b8 EFLAGS: 00010046
RAX: 0000000000000058 RBX: ffff8880323ed878 RCX: 80cb91ac903ed500
RDX: ffffc90004a52000 RSI: 0000000000007911 RDI: 0000000000007912
RBP: 1ffff1100647db10 R08: ffffc9001142f147 R09: 1ffff92002285e28
R10: dffffc0000000000 R11: fffff52002285e29 R12: 1ffff1100c13fea3
R13: dffffc0000000000 R14: ffff8880609ff518 R15: ffff8880609ff518
FS:  00007fed0f2ff6c0(0000) GS:ffff88812504c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffae9b556c8 CR3: 0000000033771000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 __list_add_valid include/linux/list.h:96 [inline]
 __list_add include/linux/list.h:158 [inline]
 list_add_tail include/linux/list.h:191 [inline]
 usb_hcd_link_urb_to_ep+0x1d2/0x330 drivers/usb/core/hcd.c:1154
 dummy_urb_enqueue+0x2ad/0x780 drivers/usb/gadget/udc/dummy_hcd.c:1310
 usb_hcd_submit_urb+0x328/0x1b60 drivers/usb/core/hcd.c:1542
 keyspan_usa67_send_setup+0x6b4/0xaf0 drivers/usb/serial/keyspan.c:2740
 tty_port_raise_dtr_rts drivers/tty/tty_port.c:456 [inline]
 tty_port_block_til_ready+0x37b/0x8b0 drivers/tty/tty_port.c:540
 tty_open+0x48a/0xcc0 drivers/tty/tty_io.c:2137
 chrdev_open+0x4d9/0x600 fs/char_dev.c:411
 do_dentry_open+0x816/0x1380 fs/open.c:947
 vfs_open+0x3b/0x340 fs/open.c:1052
 do_open fs/namei.c:4700 [inline]
 path_openat+0x2e44/0x3830 fs/namei.c:4863
 do_file_open+0x23e/0x4a0 fs/namei.c:4892
 do_sys_openat2+0x115/0x200 fs/open.c:1368
 do_sys_open fs/open.c:1374 [inline]
 __do_sys_openat fs/open.c:1390 [inline]
 __se_sys_openat fs/open.c:1385 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1385
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fed0e39e019
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:00007fed0f2ff028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fed0e625fa0 RCX: 00007fed0e39e019
RDX: 0000000000000002 RSI: 0000200000000600 RDI: ffffffffffffff9c
RBP: 00007fed0e43500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fed0e626038 R14: 00007fed0e625fa0 R15: 00007ffe3aba4b58
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_add_valid_or_report+0xa5/0x130 lib/list_debug.c:35
Code: 74 12 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d e9 ed 40 31 fc cc 48 c7 c7 60 e0 4b 8c 4c 89 fe 4c 89 f2 48 89 d9 e8 3c bf 48 fc 90 <0f> 0b 48 c7 c7 40 de 4b 8c e8 2d bf 48 fc 90 0f 0b 48 c7 c7 00 df
RSP: 0018:ffffc9001142f3b8 EFLAGS: 00010046
RAX: 0000000000000058 RBX: ffff8880323ed878 RCX: 80cb91ac903ed500
RDX: ffffc90004a52000 RSI: 0000000000007911 RDI: 0000000000007912
RBP: 1ffff1100647db10 R08: ffffc9001142f147 R09: 1ffff92002285e28
R10: dffffc0000000000 R11: fffff52002285e29 R12: 1ffff1100c13fea3
R13: dffffc0000000000 R14: ffff8880609ff518 R15: ffff8880609ff518
FS:  00007fed0f2ff6c0(0000) GS:ffff88812504c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffae9b556c8 CR3: 0000000033771000 CR4: 0000000000350ef0