netdev - new splat

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Message-ID: <CAADnVQJFWn3dBFJtY+ci6oN1pDFL=TzCmNbRgey7MdYxt_AP2g@mail.gmail.com>
Date: Sun, 30 Mar 2025 16:28:59 -0700
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: bpf <bpf@...r.kernel.org>, Network Development <netdev@...r.kernel.org>, 
	Jakub Kicinski <kuba@...nel.org>
Subject: new splat

After bpf fast forward we see this new failure:

[  138.359852] BUG: using __this_cpu_read() in preemptible [00000000]
code: test_progs/9368
[  138.362686] caller is lwtunnel_xmit+0x1c/0x2e0
[  138.364363] CPU: 9 UID: 0 PID: 9368 Comm: test_progs Tainted: G
      O        6.14.0-10767-g8be3a12f9f26 #1092 PREEMPT
[  138.364366] Tainted: [O]=OOT_MODULE
[  138.364366] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
[  138.364368] Call Trace:
[  138.364370]  <TASK>
[  138.364375]  dump_stack_lvl+0x80/0x90
[  138.364381]  check_preemption_disabled+0xc6/0xe0
[  138.364385]  lwtunnel_xmit+0x1c/0x2e0
[  138.364387]  ip_finish_output2+0x2f9/0x850
[  138.364391]  ? __ip_finish_output+0xa0/0x320
[  138.364394]  ip_send_skb+0x3f/0x90
[  138.364397]  udp_send_skb+0x1a6/0x3d0
[  138.364402]  udp_sendmsg+0x87b/0x1000
[  138.364404]  ? ip_frag_init+0x60/0x60
[  138.364406]  ? reacquire_held_locks+0xcd/0x1f0
[  138.364414]  ? copy_process+0x2ae0/0x2fa0
[  138.364418]  ? inet_autobind+0x41/0x60
[  138.364420]  ? __local_bh_enable_ip+0x79/0xe0
[  138.364422]  ? inet_autobind+0x41/0x60
[  138.364424]  ? inet_send_prepare+0xe7/0x1e0
[  138.364428]  __sock_sendmsg+0x38/0x70
[  138.364432]  ____sys_sendmsg+0x1c9/0x200
[  138.364437]  ___sys_sendmsg+0x73/0xa0
[  138.364444]  ? __fget_files+0xb9/0x180
[  138.364447]  ? lock_release+0x131/0x280
[  138.364450]  ? __fget_files+0xc3/0x180
[  138.364453]  __sys_sendmsg+0x5a/0xa0

and

[  124.853349] BUG: using __this_cpu_read() in preemptible [00000000]
code: ping/9212
[  124.856062] caller is lwtunnel_xmit+0x1c/0x2e0
[  124.857717] CPU: 5 UID: 0 PID: 9212 Comm: ping Tainted: G
O        6.14.0-10767-g8be3a12f9f26 #1092 PREEMPT
[  124.857720] Tainted: [O]=OOT_MODULE
[  124.857721] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
[  124.857722] Call Trace:
[  124.857724]  <TASK>
[  124.857726]  dump_stack_lvl+0x80/0x90
[  124.857730]  check_preemption_disabled+0xc6/0xe0
[  124.857734]  lwtunnel_xmit+0x1c/0x2e0
[  124.857736]  ip_finish_output2+0x2f9/0x850
[  124.857740]  ? __ip_finish_output+0xa0/0x320
[  124.857743]  ip_push_pending_frames+0x63/0xb0
[  124.857746]  raw_sendmsg+0x7d8/0x1530

I couldn't find a responsible commit.
Not sure what changed.