list_add double add: new=ffff888022d52718, prev=ffff888022d52718, next=ffff888014c92078.
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:35!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 3 UID: 0 PID: 6590 Comm: syz.1.534 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:__list_add_valid_or_report.cold+0x34/0x36 lib/list_debug.c:35
Code: eb ff 90 0f 0b 48 c7 c7 00 5b 62 8c e8 7a c9 eb ff 90 0f 0b 48 89 d9 4c 89 ea 48 89 ee 48 c7 c7 40 5d 62 8c e8 62 c9 eb ff 90 <0f> 0b 48 89 de 48 c7 c7 00 5e 62 8c e8 50 c9 eb ff 90 0f 0b 48 89
RSP: 0018:ffffc9000cd8f478 EFLAGS: 00010086
RAX: 0000000000000058 RBX: ffff888014c92078 RCX: 0000000000000000
RDX: 0000000000000058 RSI: ffffffff81e9ad09 RDI: fffff520019b1e80
RBP: ffff888022d52718 R08: 0000000000000007 R09: 0000000000000000
R10: 8000000000000002 R11: 0000000000000001 R12: ffff888014c92080
R13: ffff888022d52718 R14: 0000000000000000 R15: ffff888022d52718
FS:  0000000000000000(0000) GS:ffff888095a4a000(0063) knlGS:0000000056ff5480
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000006911c000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __list_add_valid include/linux/list.h:104 [inline]
 __list_add include/linux/list.h:169 [inline]
 list_add_tail include/linux/list.h:206 [inline]
 usb_hcd_link_urb_to_ep+0x220/0x3a0 drivers/usb/core/hcd.c:1154
 dummy_urb_enqueue+0x2b5/0x880 drivers/usb/gadget/udc/dummy_hcd.c:1314
 usb_hcd_submit_urb+0x268/0x2150 drivers/usb/core/hcd.c:1542
 usb_submit_urb+0x827/0x19b0 drivers/usb/core/urb.c:586
 keyspan_usa49_send_setup.isra.0+0x72c/0xf10 drivers/usb/serial/keyspan.c:2466
 keyspan_send_setup+0x179/0x1c0 drivers/usb/serial/keyspan.c:2763
 keyspan_open+0x43b/0x5c0 drivers/usb/serial/keyspan.c:1564
 serial_port_activate+0x181/0x290 drivers/usb/serial/usb-serial.c:268
 tty_port_open+0x161/0x220 drivers/tty/tty_port.c:798
 tty_open+0x2cc/0xe20 drivers/tty/tty_io.c:2112
 chrdev_open+0x234/0x6a0 fs/char_dev.c:411
 do_dentry_open+0x6ab/0x14d0 fs/open.c:996
 vfs_open+0x82/0x3f0 fs/open.c:1101
 do_open fs/namei.c:4866 [inline]
 path_openat+0x19fa/0x2440 fs/namei.c:5029
 do_file_open+0x20e/0x430 fs/namei.c:5058
 do_sys_openat2+0x10f/0x1e0 fs/open.c:1417
 do_sys_open fs/open.c:1423 [inline]
 __do_compat_sys_openat fs/open.c:1485 [inline]
 __se_compat_sys_openat fs/open.c:1483 [inline]
 __ia32_compat_sys_openat+0x12d/0x210 fs/open.c:1483
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline]
 __do_fast_syscall_32+0x13a/0x8b0 arch/x86/entry/syscall_32.c:291
 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:316
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fa3fec
Code: Unable to access opcode bytes at 0xf7fa3fc2.
RSP: 002b:00000000ffc08a1c EFLAGS: 00000296 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00000000ffffff9c RCX: 0000000080000400
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_add_valid_or_report.cold+0x34/0x36 lib/list_debug.c:35
Code: eb ff 90 0f 0b 48 c7 c7 00 5b 62 8c e8 7a c9 eb ff 90 0f 0b 48 89 d9 4c 89 ea 48 89 ee 48 c7 c7 40 5d 62 8c e8 62 c9 eb ff 90 <0f> 0b 48 89 de 48 c7 c7 00 5e 62 8c e8 50 c9 eb ff 90 0f 0b 48 89
RSP: 0018:ffffc9000cd8f478 EFLAGS: 00010086
RAX: 0000000000000058 RBX: ffff888014c92078 RCX: 0000000000000000
RDX: 0000000000000058 RSI: ffffffff81e9ad09 RDI: fffff520019b1e80
RBP: ffff888022d52718 R08: 0000000000000007 R09: 0000000000000000
R10: 8000000000000002 R11: 0000000000000001 R12: ffff888014c92080
R13: ffff888022d52718 R14: 0000000000000000 R15: ffff888022d52718
FS:  0000000000000000(0000) GS:ffff888095a4a000(0063) knlGS:0000000056ff5480
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f7fa4000 CR3: 000000006911c000 CR4: 0000000000352ef0