BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 0 PID: 2371 Comm: syz-executor.0 Not tainted 5.8.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x18f/0x20d lib/dump_stack.c:118
 add_chain_cache kernel/locking/lockdep.c:3063 [inline]
 lookup_chain_cache_add kernel/locking/lockdep.c:3162 [inline]
 validate_chain kernel/locking/lockdep.c:3183 [inline]
 __lock_acquire.cold+0x11/0x3f8 kernel/locking/lockdep.c:4380
 lock_acquire+0x1f1/0xad0 kernel/locking/lockdep.c:4959
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
 perf_ctx_lock kernel/events/core.c:163 [inline]
 perf_event_context_sched_in kernel/events/core.c:3738 [inline]
 __perf_event_task_sched_in+0x520/0x990 kernel/events/core.c:3796
 perf_event_task_sched_in include/linux/perf_event.h:1199 [inline]
 finish_task_switch+0x437/0x750 kernel/sched/core.c:3290
 context_switch kernel/sched/core.c:3456 [inline]
 __schedule+0x8e9/0x1eb0 kernel/sched/core.c:4178
 preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:4436
 idtentry_exit_cond_resched arch/x86/entry/common.c:663 [inline]
 idtentry_exit_cond_rcu+0xc0/0xf0 arch/x86/entry/common.c:710
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:587
RIP: 0010:kernfs_drain fs/kernfs/dir.c:477 [inline]
RIP: 0010:__kernfs_remove+0x539/0xa30 fs/kernfs/dir.c:1323
Code: ff e8 8b b1 8c ff 48 8b 85 f8 fe ff ff 48 c1 e8 03 42 0f b6 04 30 84 c0 74 08 3c 01 0f 8e 96 04 00 00 44 0f b7 a3 98 00 00 00 <31> ff 66 41 81 e4 00 01 44 89 e6 e8 b7 ad 8c ff 66 45 85 e4 0f 85
RSP: 0018:ffffc900053b6e38 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff8880a6b4d0e8 RCX: ffffc90001b01000
RDX: 0000000000040000 RSI: ffffffff81e70875 RDI: 0000000000000005
RBP: ffffc900053b6f60 R08: 0000000000000000 R09: ffff8880a6b4d0ef
R10: 0000000080000001 R11: 0000000000000000 R12: 0000000000000152
R13: 0000000080000001 R14: dffffc0000000000 R15: ffff8880aa204800
 kernfs_remove_by_name_ns+0x51/0xb0 fs/kernfs/dir.c:1516
 kernfs_remove_by_name include/linux/kernfs.h:593 [inline]
 sysfs_unmerge_group+0xe3/0x160 fs/sysfs/group.c:369
 rpm_sysfs_remove drivers/base/power/sysfs.c:783 [inline]
 dpm_sysfs_remove+0x79/0xb0 drivers/base/power/sysfs.c:792
 device_del+0x18b/0xd20 drivers/base/core.c:2834
 rollback_registered_many+0xa07/0xf60 net/core/dev.c:8995
 unregister_netdevice_many.part.0+0x1a/0x2f0 net/core/dev.c:10113
 unregister_netdevice_many+0x36/0x50 net/core/dev.c:10112
 __rtnl_newlink+0x13bd/0x1730 net/core/rtnetlink.c:3380
 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3397
 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5460
 netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2469
 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1329
 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2352
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2406
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2439
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c1d9
Code: Bad RIP value.
RSP: 002b:00007f8d462e2c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000002a480 RCX: 000000000045c1d9
RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000004
RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 0000000000c9fb6f R14: 00007f8d462e39c0 R15: 000000000078bf0c