netdev - BUG: looking up invalid subclass: 8

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Date: Tue, 17 Oct 2023 16:41:41 -0700 (PDT)
From: Eric Wheeler <netdev@...ts.ewheeler.net>
To: netdev@...r.kernel.org
Subject: BUG: looking up invalid subclass: 8

Hello all:

We are running Linux 6.5.7 and are getting the following trace in dmesg.

I found a similar backtrace that was fixed in
3510c7aa069aa83a2de6dab2b41401a198317bdc .  It was for ALSA, but had the
same BUG of "looking up invalid subclass: 8" and the fix was trivial,
noting that MAX_HOPS shouldn't be bigger than MAX_LOCKDEP_SUBCLASSES.

Is there a simple fix for this in netlink, too?

]# ./scripts/decode_stacktrace.sh vmlinux `pwd` < stackdump.txt 
[  113.347055] BUG: looking up invalid subclass: 8
[  113.357387] turning off the locking correctness validator.
[  113.364842] Hardware name: Supermicro Super Server/H11SSL-i, BIOS 2.4 12/27/2021
[  113.373614] Call Trace:
[  113.381874]  <TASK>
[  113.382556] dump_stack_lvl (lib/dump_stack.c:108) 
[  113.388816] look_up_lock_class (kernel/locking/lockdep.c:941) 
[  113.399562] register_lock_class (kernel/locking/lockdep.c:1284 (discriminator 13)) 
[  113.400238] ? srso_return_thunk (arch/x86/lib/retpoline.S:308) 
[  113.403627] __lock_acquire (kernel/locking/lockdep.c:5014) 
[  113.414652] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5755) 
[  113.428619] ? srso_return_thunk (arch/x86/lib/retpoline.S:308) 
[  113.435463] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5724) 
[  113.440620] _raw_spin_lock_nested (kernel/locking/spinlock.c:379) 
[  113.462749] ? __nla_validate_parse (lib/nlattr.c:606) 
[  113.471052] genl_family_rcv_msg_doit.isra.0 (net/netlink/genetlink.c:970) 
[  113.471651] genl_family_rcv_msg (net/netlink/genetlink.c:1050) 
[  113.483623] genl_rcv_msg (net/netlink/genetlink.c:1069) 
[  113.489055] ? __pfx_genl_rcv_msg (net/netlink/genetlink.c:1056) 
[  113.489623] netlink_rcv_skb (net/netlink/af_netlink.c:2519) 
[  113.492711] genl_rcv (net/netlink/genetlink.c:1079) 
[  113.502610] netlink_unicast (net/netlink/af_netlink.c:1338 net/netlink/af_netlink.c:1363) 
[  113.506927] netlink_sendmsg (net/netlink/af_netlink.c:1885) 
[  113.507486] sock_write_iter (net/socket.c:725 net/socket.c:740 net/socket.c:1147) 
[  113.510657] vfs_write (./include/linux/fs.h:1877 fs/read_write.c:491 fs/read_write.c:584) 
[  113.519624] ksys_write (fs/read_write.c:637) 
[  113.524713] do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80) 
[  113.525233] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120) 
[  113.526621] RIP: 0033:0x7f41c473e987
[ 113.535618] Code: 0b 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85

Code starting with the faulting instruction
===========================================
   0:	0b 00                	or     (%rax),%eax
   2:	f7 d8                	neg    %eax
   4:	64 89 02             	mov    %eax,%fs:(%rdx)
   7:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   e:	eb b7                	jmp    0xffffffffffffffc7
  10:	0f 1f 00             	nopl   (%rax)
  13:	f3 0f 1e fa          	endbr64 
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85                   	.byte 0x85
c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 24
[  113.543013] RSP: 002b:00007ffe80a28648 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[  113.543627] RAX: ffffffffffffffda RBX: 00000000000000c8 RCX: 00007f41c473e987
[  113.552607] RDX: 00000000000000c8 RSI: 000055be8e4f7320 RDI: 0000000000000004
[  113.560243] RBP: 000055be8e4f7320 R08: 0000000000000000 R09: 0000000000000000
[  113.560803] R10: 0000000000001000 R11: 0000000000000246 R12: 00000000000000c8
[  113.561353] R13: 0000000000000004 R14: 00007ffe80a28970 R15: 000055be8d383848
[  113.569626]  </TASK>






--
Eric Wheeler