syzbot

------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(!test_bit(class_idx, lock_classes_in_use))
WARNING: CPU: 1 PID: 16678 at kernel/locking/lockdep.c:5196 __lock_acquire+0x165b/0x2100 kernel/locking/lockdep.c:5196
Modules linked in:
CPU: 1 UID: 0 PID: 16678 Comm: syz-executor Not tainted 6.13.0-rc6-syzkaller-00213-ge0daef7de1ac #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:__lock_acquire+0x165b/0x2100 kernel/locking/lockdep.c:5196
Code: 0f b6 04 08 84 c0 0f 85 31 0a 00 00 83 3d f0 d9 9e 0e 00 75 19 90 48 c7 c7 80 97 0a 8c 48 c7 c6 60 c0 0a 8c e8 76 4c e5 ff 90 <0f> 0b 90 90 90 e9 be fd ff ff 90 0f 0b 90 e9 16 fd ff ff 90 e8 5c
RSP: 0018:ffffc90003d0f0f0 EFLAGS: 00010046

RAX: b72f87a4a9175900 RBX: 000000000b346abc RCX: ffff888044bf3c00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888044bf4708 R08: ffffffff81602a82 R09: 1ffffffff2033056
R10: dffffc0000000000 R11: fffffbfff2033057 R12: ffff888044bf46c4
R13: ffff888044bf3c00 R14: 0000000000000000 R15: ffff888044bf4728
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32b1aff8 CR3: 0000000053d80000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
 down+0x39/0xc0 kernel/locking/semaphore.c:59
 __dev_close_many+0x107/0x300 net/core/dev.c:1562
 dev_close_many+0x24e/0x4c0 net/core/dev.c:1615
 unregister_netdevice_many_notify+0x530/0x1da0 net/core/dev.c:11519
 unregister_netdevice_many net/core/dev.c:11609 [inline]
 unregister_netdevice_queue+0x303/0x370 net/core/dev.c:11481
 unregister_netdevice include/linux/netdevice.h:3192 [inline]
 __tun_detach+0x6b9/0x1600 drivers/net/tun.c:685
 tun_detach drivers/net/tun.c:701 [inline]
 tun_chr_close+0x105/0x1b0 drivers/net/tun.c:3517
 __fput+0x23e/0xa50 fs/file_table.c:450
 task_work_run+0x251/0x310 kernel/task_work.c:239
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0xa2a/0x28e0 kernel/exit.c:938
 do_group_exit+0x207/0x2c0 kernel/exit.c:1087
 get_signal+0x16b2/0x1750 kernel/signal.c:3017
 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f65ae98473c
Code: Unable to access opcode bytes at 0x7f65ae984712.
RSP: 002b:00007ffcbc13d200 EFLAGS: 00000246
 ORIG_RAX: 0000000000000000
RAX: fffffffffffffe00 RBX: 00000000ffffffff RCX: 00007f65ae98473c
RDX: 0000000000000030 RSI: 00007ffcbc13d2b0 RDI: 00000000000000f9
RBP: 00007ffcbc13d25c R08: 0000000000000000 R09: 0079746972756365
R10: 00007f65aeb487e0 R11: 0000000000000246 R12: 0000000000000032
R13: 00000000001cf72c R14: 00007ffcbc13d2b0 R15: 0000000000000258
 </TASK>