syzbot

INFO: trying to register non-static key.
The code is fine but needs lockdep annotation, or maybe
you didn't initialize this object before use?
turning off the locking correctness validator.
CPU: 1 PID: 6675 Comm: syz-executor912 Not tainted 6.1.0-rc7-syzkaller-33097-ge3cb714fb489 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022
Call trace:
 dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:156
 show_stack+0x2c/0x54 arch/arm64/kernel/stacktrace.c:163
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x104/0x16c lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 assign_lock_key+0x134/0x140 kernel/locking/lockdep.c:981
 register_lock_class+0xc4/0x2f8 kernel/locking/lockdep.c:1294
 __lock_acquire+0xa8/0x3084 kernel/locking/lockdep.c:4934
 lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5668
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x6c/0xb4 kernel/locking/spinlock.c:162
 gsm_send+0x19c/0x264 drivers/tty/n_gsm.c:725
 gsm_command drivers/tty/n_gsm.c:789 [inline]
 gsm_dlci_begin_close drivers/tty/n_gsm.c:1933 [inline]
 gsm_cleanup_mux+0xd0/0x3c0 drivers/tty/n_gsm.c:2492
 gsm_config drivers/tty/n_gsm.c:2754 [inline]
 gsmld_ioctl+0x5fc/0x778 drivers/tty/n_gsm.c:3117
 tty_ioctl+0x694/0x9b0 drivers/tty/tty_io.c:2780
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __arm64_sys_ioctl+0xd0/0x140 fs/ioctl.c:856
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
 el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x48/0x140 arch/arm64/kernel/syscall.c:197
 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584
list_add corruption. prev->next should be next (ffff0000ccd00390), but was 8000000100000000. (prev=ffff0000ccd00690).
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:32!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 6675 Comm: syz-executor912 Not tainted 6.1.0-rc7-syzkaller-33097-ge3cb714fb489 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022
pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __list_add_valid+0xb4/0xb8 lib/list_debug.c:30
lr : __list_add_valid+0xb4/0xb8 lib/list_debug.c:30
sp : ffff800015d3bba0
x29: ffff800015d3bba0 x28: 00000000000000d7 x27: 0000000000000000
x26: ffff0000c98651a5 x25: 0000000000000001 x24: ffff0000ccd00390
x23: ffff0000ccd00690 x22: 0000000000000000 x21: ffff0000ccd00348
x20: ffff0000c9865180 x19: ffff0000cccfff80 x18: 0000000000000106
x17: 3039333030646363 x16: 3030303066666666 x15: 28207478656e2065
x14: 6220646c756f6873 x13: 205d353736365420 x12: 5b5d363437333236
x11: ff808000081c4d64 x10: 0000000000000000 x9 : 349d594052031c00
x8 : 349d594052031c00 x7 : 205b5d3634373332 x6 : ffff80000c091044
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000000 x1 : 0000000100000001 x0 : 0000000000000075
Call trace:
 __list_add_valid+0xb4/0xb8 lib/list_debug.c:30
 __list_add include/linux/list.h:69 [inline]
 list_add_tail include/linux/list.h:102 [inline]
 gsm_send+0x1b8/0x264 drivers/tty/n_gsm.c:726
 gsm_command drivers/tty/n_gsm.c:789 [inline]
 gsm_dlci_begin_close drivers/tty/n_gsm.c:1933 [inline]
 gsm_cleanup_mux+0xd0/0x3c0 drivers/tty/n_gsm.c:2492
 gsm_config drivers/tty/n_gsm.c:2754 [inline]
 gsmld_ioctl+0x5fc/0x778 drivers/tty/n_gsm.c:3117
 tty_ioctl+0x694/0x9b0 drivers/tty/tty_io.c:2780
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __arm64_sys_ioctl+0xd0/0x140 fs/ioctl.c:856
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
 el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x48/0x140 arch/arm64/kernel/syscall.c:197
 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584
Code: 9139b400 aa0303e1 aa0803e3 94aa88ef (d4210000) 
---[ end trace 0000000000000000 ]---