netdev - Re: [PATCH net-next v2 0/2] netdevsim: add NAPI support

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Date: Fri, 19 Apr 2024 18:47:57 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: David Wei <dw@...idwei.uk>
Cc: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH net-next v2 0/2] netdevsim: add NAPI support

On Fri, 19 Apr 2024 15:08:55 -0700 David Wei wrote:
> Add NAPI support to netdevsim and register its Rx queues with NAPI
> instances. Then add a selftest using the new netdev Python selftest
> infra to exercise the existing Netdev Netlink API, specifically the
> queue-get API.

I haven't looked at the code but this makes the devlink test crash 
the kernel:

[ 1130.858677][T11010] KASAN: null-ptr-deref in range [0x0000000000000190-0x0000000000000197]
[ 1130.859158][T11010] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[1130.859478][T11010] RIP: 0010:skb_queue_purge_reason (./include/linux/skbuff.h:1846 net/core/skbuff.c:3821) 
[ 1130.859672][T11010] Code: f1 f1 f1 f1 c7 40 0c 00 00 00 f3 c7 40 10 f3 f3 f3 f3 65 48 8b 04 25 28 00 00 00 48 89 84 24 d8 00 00 00 48 89 f8 48 c1 e8 03 <80> 3c 10 00 0f 85 bb 02 00 00 48 8b 03 48 39 c3 0f 84 ed 01 00 00
All code
========
   0:	f1                   	int1
   1:	f1                   	int1
   2:	f1                   	int1
   3:	f1                   	int1
   4:	c7 40 0c 00 00 00 f3 	movl   $0xf3000000,0xc(%rax)
   b:	c7 40 10 f3 f3 f3 f3 	movl   $0xf3f3f3f3,0x10(%rax)
  12:	65 48 8b 04 25 28 00 	mov    %gs:0x28,%rax
  19:	00 00 
  1b:	48 89 84 24 d8 00 00 	mov    %rax,0xd8(%rsp)
  22:	00 
  23:	48 89 f8             	mov    %rdi,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
  2a:*	80 3c 10 00          	cmpb   $0x0,(%rax,%rdx,1)		<-- trapping instruction
  2e:	0f 85 bb 02 00 00    	jne    0x2ef
  34:	48 8b 03             	mov    (%rbx),%rax
  37:	48 39 c3             	cmp    %rax,%rbx
  3a:	0f 84 ed 01 00 00    	je     0x22d

Code starting with the faulting instruction
===========================================
   0:	80 3c 10 00          	cmpb   $0x0,(%rax,%rdx,1)
   4:	0f 85 bb 02 00 00    	jne    0x2c5
   a:	48 8b 03             	mov    (%rbx),%rax
   d:	48 39 c3             	cmp    %rax,%rbx
  10:	0f 84 ed 01 00 00    	je     0x203
[ 1130.860181][T11010] RSP: 0018:ffffc900044ff8e0 EFLAGS: 00010202
[ 1130.860367][T11010] RAX: 0000000000000032 RBX: 0000000000000190 RCX: 0000000000000001
[ 1130.860580][T11010] RDX: dffffc0000000000 RSI: 0000000000000055 RDI: 0000000000000190
[ 1130.860821][T11010] RBP: ffffc900044ff9f0 R08: 0000000000000001 R09: fffffbfff10468b4
[ 1130.861067][T11010] R10: 0000000000000003 R11: ffffffff84800130 R12: ffffed10010f7584
[ 1130.861312][T11010] R13: 0000000000000001 R14: 0000000000000055 R15: 1ffff9200089ff20
[ 1130.861543][T11010] FS:  00007f691c6ba740(0000) GS:ffff888036180000(0000) knlGS:0000000000000000
[ 1130.861801][T11010] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1130.861983][T11010] CR2: 000055d41b377ff0 CR3: 000000000988a003 CR4: 0000000000770ef0
[ 1130.862199][T11010] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1130.862408][T11010] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1130.862630][T11010] PKRU: 55555554
[ 1130.862745][T11010] Call Trace:
[ 1130.862876][T11010]  <TASK>
[1130.862954][T11010] ? die_addr (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:460) 
[1130.863080][T11010] ? exc_general_protection (arch/x86/kernel/traps.c:702 arch/x86/kernel/traps.c:644) 
[1130.863256][T11010] ? asm_exc_general_protection (./arch/x86/include/asm/idtentry.h:617) 
[1130.863401][T11010] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[1130.863599][T11010] ? skb_queue_purge_reason (./include/linux/skbuff.h:1846 net/core/skbuff.c:3821) 
[1130.863755][T11010] ? __pfx_skb_queue_purge_reason (net/core/skbuff.c:3817) 
[1130.863954][T11010] ? unregister_netdevice_queue (net/core/dev.c:11123) 
[1130.864129][T11010] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[1130.864291][T11010] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11112) 
[1130.864469][T11010] nsim_destroy (drivers/net/netdevsim/netdev.c:653 drivers/net/netdevsim/netdev.c:784) netdevsim
[1130.864651][T11010] __nsim_dev_port_del (drivers/net/netdevsim/dev.c:426 drivers/net/netdevsim/dev.c:1426) netdevsim
[1130.864889][T11010] nsim_dev_reload_destroy (drivers/net/netdevsim/dev.c:591 drivers/net/netdevsim/dev.c:1655) netdevsim
[1130.865081][T11010] nsim_drv_remove (drivers/net/netdevsim/dev.c:1675) netdevsim
[1130.865250][T11010] device_release_driver_internal (drivers/base/dd.c:1272 drivers/base/dd.c:1293) 
-- 
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