Subject: Re: BUG: looking up invalid subclass: 8

From: Jakub Kicinski <[email-masked]>
Date: Wed, 18 Oct 2023 11:52:34 -0700

On Wed, 18 Oct 2023 11:44:43 -0700 (PDT) Eric Wheeler wrote:
> Here it is from two different hosts.
> 
> This is vanilla v6.5.7:
> 
> Oct 16 09:48:47 hv1.ewheeler.net kernel: BUG: looking up invalid subclass: 8
> Oct 16 09:48:47 hv1.ewheeler.net kernel: turning off the locking correctness validator.
> Oct 16 09:48:47 hv1.ewheeler.net kernel: CPU: 8 PID: 13275 Comm: drbdsetup-84 Tainted: G            E      6.5.7 #23
> Oct 16 09:48:47 hv1.ewheeler.net kernel: Hardware name: Supermicro Super Server/H11SSL-i, BIOS 2.4 12/27/2021
> Oct 16 09:48:47 hv1.ewheeler.net kernel: Call Trace:
> Oct 16 09:48:47 hv1.ewheeler.net kernel: <TASK>
> Oct 16 09:48:47 hv1.ewheeler.net kernel: dump_stack_lvl+0x60/0xa0
> Oct 16 09:48:47 hv1.ewheeler.net kernel: look_up_lock_class+0x10b/0x150
> Oct 16 09:48:47 hv1.ewheeler.net kernel: register_lock_class+0x48/0x500
> Oct 16 09:48:47 hv1.ewheeler.net kernel: ? srso_return_thunk+0x5/0x10
> Oct 16 09:48:47 hv1.ewheeler.net kernel: __lock_acquire+0x5f/0xb80
> Oct 16 09:48:47 hv1.ewheeler.net kernel: lock_acquire.part.0+0x90/0x210
> Oct 16 09:48:47 hv1.ewheeler.net kernel: ? lock_all_resources+0x5a/0x90 [drbd]
> Oct 16 09:48:47 hv1.ewheeler.net kernel: ? lock_all_resources+0x5a/0x90 [drbd]
> Oct 16 09:48:47 hv1.ewheeler.net kernel: ? srso_return_thunk+0x5/0x10
> Oct 16 09:48:47 hv1.ewheeler.net kernel: ? lock_acquire+0x10b/0x120
> Oct 16 09:48:47 hv1.ewheeler.net kernel: ? lock_all_resources+0x5a/0x90 [drbd]
> Oct 16 09:48:47 hv1.ewheeler.net kernel: _raw_spin_lock_nested+0x33/0x80
> Oct 16 09:48:47 hv1.ewheeler.net kernel: ? lock_all_resources+0x5a/0x90 [drbd]
> Oct 16 09:48:47 hv1.ewheeler.net kernel: lock_all_resources+0x5a/0x90 [drbd]
> Oct 16 09:48:47 hv1.ewheeler.net kernel: drbd_adm_attach+0x748/0x1340 [drbd]

Oh, that's much clearer, thank you.
The warnings comes from DRBD, genl is just the entry point.
Adding DRBD folks.

> Oct 16 09:48:47 hv1.ewheeler.net kernel: ? __nla_validate_parse+0x13f/0x1f0
> Oct 16 09:48:47 hv1.ewheeler.net kernel: genl_family_rcv_msg_doit.isra.0+0xe4/0x150
> Oct 16 09:48:47 hv1.ewheeler.net kernel: genl_family_rcv_msg+0x187/0x260
> Oct 16 09:48:47 hv1.ewheeler.net kernel: ? __pfx_drbd_adm_attach+0x10/0x10 [drbd]
> Oct 16 09:48:47 hv1.ewheeler.net kernel: genl_rcv_msg+0x4b/0xb0
> Oct 16 09:48:47 hv1.ewheeler.net kernel: ? __pfx_genl_rcv_msg+0x10/0x10
> Oct 16 09:48:47 hv1.ewheeler.net kernel: netlink_rcv_skb+0x66/0x120
> Oct 16 09:48:47 hv1.ewheeler.net kernel: genl_rcv+0x28/0x40
> Oct 16 09:48:47 hv1.ewheeler.net kernel: netlink_unicast+0x1b8/0x280
> Oct 16 09:48:47 hv1.ewheeler.net kernel: netlink_sendmsg+0x273/0x520
> Oct 16 09:48:47 hv1.ewheeler.net kernel: sock_write_iter+0x188/0x190
> Oct 16 09:48:47 hv1.ewheeler.net kernel: vfs_write+0x3e5/0x520
> Oct 16 09:48:47 hv1.ewheeler.net kernel: ksys_write+0xc8/0x100
> Oct 16 09:48:47 hv1.ewheeler.net kernel: do_syscall_64+0x3f/0xa0
> Oct 16 09:48:47 hv1.ewheeler.net kernel: entry_SYSCALL_64_after_hwframe+0x6e/0xd8
> Oct 16 09:48:47 hv1.ewheeler.net kernel: RIP: 0033:0x7f41c473e987
> Oct 16 09:48:47 hv1.ewheeler.net kernel: 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 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
> Oct 16 09:48:47 hv1.ewheeler.net kernel: RSP: 002b:00007ffe80a28648 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
> Oct 16 09:48:47 hv1.ewheeler.net kernel: RAX: ffffffffffffffda RBX: 00000000000000c8 RCX: 00007f41c473e987
> Oct 16 09:48:47 hv1.ewheeler.net kernel: RDX: 00000000000000c8 RSI: 000055be8e4f7320 RDI: 0000000000000004
> Oct 16 09:48:47 hv1.ewheeler.net kernel: RBP: 000055be8e4f7320 R08: 0000000000000000 R09: 0000000000000000
> Oct 16 09:48:47 hv1.ewheeler.net kernel: R10: 0000000000001000 R11: 0000000000000246 R12: 00000000000000c8
> Oct 16 09:48:47 hv1.ewheeler.net kernel: R13: 0000000000000004 R14: 00007ffe80a28970 R15: 000055be8d383848
> Oct 16 09:48:47 hv1.ewheeler.net kernel: </TASK>