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Message-ID: <CAA85sZu=CzJx9QD87-vehOStzO9qHUSWk6DXZg3TzJeqOV5-aw@mail.gmail.com>
Date: Mon, 26 Jun 2023 20:59:20 +0200
From: Ian Kumlien <ian.kumlien@...il.com>
To: Paolo Abeni <pabeni@...hat.com>
Cc: Alexander Lobakin <aleksander.lobakin@...el.com>,
intel-wired-lan <intel-wired-lan@...ts.osuosl.org>,
Jakub Kicinski <kuba@...nel.org>,
Eric Dumazet <edumazet@...gle.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Intel-wired-lan] bug with rx-udp-gro-forwarding offloading?
On Mon, Jun 26, 2023 at 8:20 PM Ian Kumlien <ian.kumlien@...il.com> wrote:
>
> Nevermind, I think I found it, I will loop this thing until I have a
> proper trace....
Still some question marks, but much better
cat bug.txt | ./scripts/decode_stacktrace.sh vmlinux
[ 62.624003] BUG: kernel NULL pointer dereference, address: 00000000000000c0
[ 62.631083] #PF: supervisor read access in kernel mode
[ 62.636312] #PF: error_code(0x0000) - not-present page
[ 62.641541] PGD 0 P4D 0
[ 62.644174] Oops: 0000 [#1] PREEMPT SMP NOPTI
[ 62.648629] CPU: 1 PID: 913 Comm: napi/eno2-79 Not tainted 6.4.0 #364
[ 62.655162] Hardware name: Supermicro Super Server/A2SDi-12C-HLN4F,
BIOS 1.7a 10/13/2022
[ 62.663344] RIP: 0010:__udp_gso_segment
(./include/linux/skbuff.h:2858 ./include/linux/udp.h:23
net/ipv4/udp_offload.c:228 net/ipv4/udp_offload.c:261
net/ipv4/udp_offload.c:277)
[ 62.668329] Code: c3 08 66 89 5c 02 04 45 84 e4 0f 85 27 fd ff ff 49
8b 1e 49 8b ae c0 00 00 00 41 0f b7 86 b4 00 00 00 45 0f b7 a6 b2 00
00 00 <48> 8b b3 c0 00 00 00 0f b7 8b b2 00 00 00 49 01 ec 48 01 c5 48
8d
All code
========
0: c3 ret
1: 08 66 89 or %ah,-0x77(%rsi)
4: 5c pop %rsp
5: 02 04 45 84 e4 0f 85 add -0x7af01b7c(,%rax,2),%al
c: 27 (bad)
d: fd std
e: ff (bad)
f: ff 49 8b decl -0x75(%rcx)
12: 1e (bad)
13: 49 8b ae c0 00 00 00 mov 0xc0(%r14),%rbp
1a: 41 0f b7 86 b4 00 00 movzwl 0xb4(%r14),%eax
21: 00
22: 45 0f b7 a6 b2 00 00 movzwl 0xb2(%r14),%r12d
29: 00
2a:* 48 8b b3 c0 00 00 00 mov 0xc0(%rbx),%rsi <-- trapping instruction
31: 0f b7 8b b2 00 00 00 movzwl 0xb2(%rbx),%ecx
38: 49 01 ec add %rbp,%r12
3b: 48 01 c5 add %rax,%rbp
3e: 48 rex.W
3f: 8d .byte 0x8d
Code starting with the faulting instruction
===========================================
0: 48 8b b3 c0 00 00 00 mov 0xc0(%rbx),%rsi
7: 0f b7 8b b2 00 00 00 movzwl 0xb2(%rbx),%ecx
e: 49 01 ec add %rbp,%r12
11: 48 01 c5 add %rax,%rbp
14: 48 rex.W
15: 8d .byte 0x8d
[ 62.687193] RSP: 0018:ffffbd3a83b4f868 EFLAGS: 00010246
[ 62.692515] RAX: 00000000000000ce RBX: 0000000000000000 RCX: 0000000000000000
[ 62.699743] RDX: ffffa124def8a000 RSI: 0000000000000079 RDI: ffffa125952a14d4
[ 62.706970] RBP: ffffa124def8a000 R08: 0000000000000022 R09: 00002000001558c9
[ 62.714199] R10: 0000000000000000 R11: 00000000be554639 R12: 00000000000000e2
[ 62.721426] R13: ffffa125952a1400 R14: ffffa125952a1400 R15: 00002000001558c9
[ 62.728654] FS: 0000000000000000(0000) GS:ffffa127efa40000(0000)
knlGS:0000000000000000
[ 62.736852] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 62.742702] CR2: 00000000000000c0 CR3: 00000001034b0000 CR4: 00000000003526e0
[ 62.749948] Call Trace:
[ 62.752498] <TASK>
[ 62.754708] ? __die (arch/x86/kernel/dumpstack.c:421
arch/x86/kernel/dumpstack.c:434)
[ 62.757879] ? page_fault_oops (arch/x86/mm/fault.c:707)
[ 62.762093] ? exc_page_fault (arch/x86/mm/fault.c:1285
arch/x86/mm/fault.c:1534 arch/x86/mm/fault.c:1590)
[ 62.766215] ? asm_exc_page_fault (./arch/x86/include/asm/idtentry.h:570)
[ 62.770508] ? __udp_gso_segment (./include/linux/skbuff.h:2858
./include/linux/udp.h:23 net/ipv4/udp_offload.c:228
net/ipv4/udp_offload.c:261 net/ipv4/udp_offload.c:277)
[ 62.774890] ? __udp_gso_segment (net/ipv4/udp_offload.c:255
net/ipv4/udp_offload.c:277)
[ 62.779267] inet_gso_segment (net/ipv4/af_inet.c:1398)
[ 62.783392] ? __wake_up_common (kernel/sched/wait.c:108)
[ 62.787605] skb_mac_gso_segment (net/core/gro.c:141)
[ 62.791906] __skb_gso_segment (net/core/dev.c:3403 (discriminator 2))
[ 62.796029] ? netif_skb_features (net/core/dev.c:3474 net/core/dev.c:3563)
[ 62.800492] validate_xmit_skb (./include/linux/netdevice.h:4862
net/core/dev.c:3659)
[ 62.804695] validate_xmit_skb_list (net/core/dev.c:3710)
[ 62.809158] sch_direct_xmit (net/sched/sch_generic.c:330)
[ 62.813198] __dev_queue_xmit (net/core/dev.c:3805 net/core/dev.c:4210)
[ 62.817314] ? nf_hook_slow (./include/linux/netfilter.h:143
net/netfilter/core.c:626)
[ 62.821093] br_dev_queue_push_xmit (net/bridge/br_forward.c:55)
[ 62.825652] maybe_deliver (net/bridge/br_forward.c:193)
[ 62.829420] br_flood (net/bridge/br_forward.c:233)
[ 62.832758] br_handle_frame_finish (net/bridge/br_input.c:215)
[ 62.837403] br_handle_frame (net/bridge/br_input.c:298
net/bridge/br_input.c:416)
[ 62.841431] ? ip6gre_tunnel_siocdevprivate (net/ipv6/ip6_gre.c:295
net/ipv6/ip6_gre.c:311 net/ipv6/ip6_gre.c:1325)
[ 62.846771] ? br_handle_local_finish (net/bridge/br_input.c:75)
[ 62.851417] __netif_receive_skb_core.constprop.0 (net/core/dev.c:5387)
[ 62.857273] ? br_handle_frame_finish (net/bridge/br_input.c:321)
[ 62.862086] ? sched_clock_cpu (kernel/sched/clock.c:387)
[ 62.866114] __netif_receive_skb_list_core (net/core/dev.c:5570)
[ 62.871367] netif_receive_skb_list_internal (net/core/dev.c:5638
net/core/dev.c:5727)
[ 62.876795] napi_complete_done (./include/linux/list.h:37
./include/net/gro.h:434 ./include/net/gro.h:429 net/core/dev.c:6067)
[ 62.881004] ixgbe_poll (drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:3191)
[ 62.884689] ? finish_task_switch.isra.0
(./arch/x86/include/asm/irqflags.h:42
./arch/x86/include/asm/irqflags.h:77 kernel/sched/sched.h:1378
kernel/sched/core.c:5095 kernel/sched/core.c:5213)
[ 62.889679] ? __napi_poll (net/core/dev.c:6625)
[ 62.893534] __napi_poll (net/core/dev.c:6498)
[ 62.897133] napi_threaded_poll (./include/linux/netpoll.h:89
net/core/dev.c:6640)
[ 62.901422] ? __napi_poll (net/core/dev.c:6625)
[ 62.905276] kthread (kernel/kthread.c:379)
[ 62.908529] ? kthread_complete_and_exit (kernel/kthread.c:332)
[ 62.913435] ret_from_fork (arch/x86/entry/entry_64.S:314)
[ 62.917119] </TASK>
[ 62.919411] Modules linked in: chaoskey
[ 62.923357] CR2: 00000000000000c0
[ 62.926782] ---[ end trace 0000000000000000 ]---
[ 62.947865] pstore: backend (erst) writing error (-28)
[ 62.953125] RIP: 0010:__udp_gso_segment
(./include/linux/skbuff.h:2858 ./include/linux/udp.h:23
net/ipv4/udp_offload.c:228 net/ipv4/udp_offload.c:261
net/ipv4/udp_offload.c:277)
[ 62.958119] Code: c3 08 66 89 5c 02 04 45 84 e4 0f 85 27 fd ff ff 49
8b 1e 49 8b ae c0 00 00 00 41 0f b7 86 b4 00 00 00 45 0f b7 a6 b2 00
00 00 <48> 8b b3 c0 00 00 00 0f b7 8b b2 00 00 00 49 01 ec 48 01 c5 48
8d
All code
========
0: c3 ret
1: 08 66 89 or %ah,-0x77(%rsi)
4: 5c pop %rsp
5: 02 04 45 84 e4 0f 85 add -0x7af01b7c(,%rax,2),%al
c: 27 (bad)
d: fd std
e: ff (bad)
f: ff 49 8b decl -0x75(%rcx)
12: 1e (bad)
13: 49 8b ae c0 00 00 00 mov 0xc0(%r14),%rbp
1a: 41 0f b7 86 b4 00 00 movzwl 0xb4(%r14),%eax
21: 00
22: 45 0f b7 a6 b2 00 00 movzwl 0xb2(%r14),%r12d
29: 00
2a:* 48 8b b3 c0 00 00 00 mov 0xc0(%rbx),%rsi <-- trapping instruction
31: 0f b7 8b b2 00 00 00 movzwl 0xb2(%rbx),%ecx
38: 49 01 ec add %rbp,%r12
3b: 48 01 c5 add %rax,%rbp
3e: 48 rex.W
3f: 8d .byte 0x8d
Code starting with the faulting instruction
===========================================
0: 48 8b b3 c0 00 00 00 mov 0xc0(%rbx),%rsi
7: 0f b7 8b b2 00 00 00 movzwl 0xb2(%rbx),%ecx
e: 49 01 ec add %rbp,%r12
11: 48 01 c5 add %rax,%rbp
14: 48 rex.W
15: 8d .byte 0x8d
[ 62.977037] RSP: 0018:ffffbd3a83b4f868 EFLAGS: 00010246
[ 62.982376] RAX: 00000000000000ce RBX: 0000000000000000 RCX: 0000000000000000
[ 62.989621] RDX: ffffa124def8a000 RSI: 0000000000000079 RDI: ffffa125952a14d4
[ 62.996864] RBP: ffffa124def8a000 R08: 0000000000000022 R09: 00002000001558c9
[ 63.004111] R10: 0000000000000000 R11: 00000000be554639 R12: 00000000000000e2
[ 63.011355] R13: ffffa125952a1400 R14: ffffa125952a1400 R15: 00002000001558c9
[ 63.018602] FS: 0000000000000000(0000) GS:ffffa127efa40000(0000)
knlGS:0000000000000000
[ 63.026816] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 63.032666] CR2: 00000000000000c0 CR3: 00000001034b0000 CR4: 00000000003526e0
[ 63.039911] Kernel panic - not syncing: Fatal exception in interrupt
[ 63.218844] Kernel Offset: 0x35e00000 from 0xffffffff81000000
(relocation range: 0xffffffff80000000-0xffffffffbfffffff)
[ 63.246284] ---[ end Kernel panic - not syncing: Fatal exception in
interrupt ]---
> On Mon, Jun 26, 2023 at 8:01 PM Ian Kumlien <ian.kumlien@...il.com> wrote:
> >
> > On Mon, Jun 26, 2023 at 7:56 PM Paolo Abeni <pabeni@...hat.com> wrote:
> > >
> > > On Mon, 2023-06-26 at 19:30 +0200, Ian Kumlien wrote:
> > > > There, that didn't take long, even with wireguard disabled
> > > >
> > > > [14079.678380] BUG: kernel NULL pointer dereference, address: 00000000000000c0
> > > > [14079.685456] #PF: supervisor read access in kernel mode
> > > > [14079.690686] #PF: error_code(0x0000) - not-present page
> > > > [14079.695915] PGD 0 P4D 0
> > > > [14079.698540] Oops: 0000 [#1] PREEMPT SMP NOPTI
> > > > [14079.702996] CPU: 11 PID: 891 Comm: napi/eno2-80 Not tainted 6.4.0 #360
> > > > [14079.709614] Hardware name: Supermicro Super Server/A2SDi-12C-HLN4F,
> > > > BIOS 1.7a 10/13/2022
> > > > [14079.717796] RIP: 0010:__udp_gso_segment+0x346/0x4f0
> > > > [14079.722778] Code: c3 08 66 89 5c 02 04 45 84 e4 0f 85 27 fd ff ff
> > > > 49 8b 1e 49 8b ae c0 00 00 00 41 0f b7 86 b4 00 00 00 45 0f b7 a6 b2
> > > > 00 00 00 <48> 8b b3 c0 00 00 00 0f b7 8b b2 00 00 00 49 01 ec 48 01 c5
> > > > 48 8d
> > > > [14079.741645] RSP: 0018:ffffa83643a4f818 EFLAGS: 00010246
> > > > [14079.746966] RAX: 00000000000000ce RBX: 0000000000000000 RCX: 0000000000000000
> > > > [14079.754195] RDX: ffffa2ad1403b000 RSI: 0000000000000028 RDI: ffffa2afc9d302d4
> > > > [14079.761422] RBP: ffffa2ad1403b000 R08: 0000000000000022 R09: 00002000001558c9
> > > > [14079.768650] R10: 0000000000000000 R11: ffffa2b02fcea888 R12: 00000000000000e2
> > > > [14079.775879] R13: ffffa2afc9d30200 R14: ffffa2afc9d30200 R15: 00002000001558c9
> > > > [14079.783106] FS: 0000000000000000(0000) GS:ffffa2b02fcc0000(0000)
> > > > knlGS:0000000000000000
> > > > [14079.791305] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > > > [14079.797162] CR2: 00000000000000c0 CR3: 0000000151ff4000 CR4: 00000000003526e0
> > > > [14079.804408] Call Trace:
> > > > [14079.806961] <TASK>
> > > > [14079.809170] ? __die+0x1a/0x60
> > > > [14079.812340] ? page_fault_oops+0x158/0x440
> > > > [14079.816551] ? ip6_route_output_flags+0xe3/0x160
> > > > [14079.821284] ? exc_page_fault+0x3f4/0x820
> > > > [14079.825408] ? update_load_avg+0x77/0x710
> > > > [14079.829534] ? asm_exc_page_fault+0x22/0x30
> > > > [14079.833836] ? __udp_gso_segment+0x346/0x4f0
> > > > [14079.838218] ? __udp_gso_segment+0x2fa/0x4f0
> > > > [14079.842600] ? _raw_spin_unlock_irqrestore+0x16/0x30
> > > > [14079.847679] ? try_to_wake_up+0x8e/0x5a0
> > > > [14079.851713] inet_gso_segment+0x150/0x3c0
> > > > [14079.855827] ? vhost_poll_wakeup+0x31/0x40
> > > > [14079.860032] skb_mac_gso_segment+0x9b/0x110
> > > > [14079.864331] __skb_gso_segment+0xae/0x160
> > > > [14079.868455] ? netif_skb_features+0x144/0x290
> > > > [14079.872928] validate_xmit_skb+0x167/0x370
> > > > [14079.877139] validate_xmit_skb_list+0x43/0x70
> > > > [14079.881612] sch_direct_xmit+0x267/0x380
> > > > [14079.885641] __qdisc_run+0x140/0x590
> > > > [14079.889324] __dev_queue_xmit+0x44d/0xba0
> > > > [14079.893450] ? nf_hook_slow+0x3c/0xb0
> > > > [14079.897229] br_dev_queue_push_xmit+0xb2/0x1c0
> > > > [14079.901788] maybe_deliver+0xa9/0x100
> > > > [14079.905564] br_flood+0x8a/0x180
> > > > [14079.908903] br_handle_frame_finish+0x31f/0x5b0
> > > > [14079.913547] br_handle_frame+0x28f/0x3a0
> > > > [14079.917585] ? ipv6_find_hdr+0x1f0/0x3e0
> > > > [14079.921622] ? br_handle_local_finish+0x20/0x20
> > > > [14079.926267] __netif_receive_skb_core.constprop.0+0x4c5/0xc90
> > > > [14079.932125] ? br_handle_frame_finish+0x5b0/0x5b0
> > > > [14079.936946] ? ___slab_alloc+0x4bf/0xaf0
> > > > [14079.940986] __netif_receive_skb_list_core+0x107/0x250
> > > > [14079.946240] netif_receive_skb_list_internal+0x194/0x2b0
> > > > [14079.951660] ? napi_gro_flush+0x97/0xf0
> > > > [14079.955604] napi_complete_done+0x69/0x180
> > > > [14079.959808] ixgbe_poll+0xe10/0x12e0
> > > > [14079.963506] __napi_poll+0x26/0x1b0
> > > > [14079.967106] napi_threaded_poll+0x232/0x250
> > > > [14079.971405] ? __napi_poll+0x1b0/0x1b0
> > > > [14079.975260] kthread+0xee/0x120
> > > > [14079.978510] ? kthread_complete_and_exit+0x20/0x20
> > > > [14079.983415] ret_from_fork+0x22/0x30
> > > > [14079.987102] </TASK>
> > > > [14079.989395] Modules linked in: chaoskey
> > > > [14079.993347] CR2: 00000000000000c0
> > > > [14079.996773] ---[ end trace 0000000000000000 ]---
> > > > [14080.018013] pstore: backend (erst) writing error (-28)
> > > > [14080.023274] RIP: 0010:__udp_gso_segment+0x346/0x4f0
> > > > [14080.028264] Code: c3 08 66 89 5c 02 04 45 84 e4 0f 85 27 fd ff ff
> > > > 49 8b 1e 49 8b ae c0 00 00 00 41 0f b7 86 b4 00 00 00 45 0f b7 a6 b2
> > > > 00 00 00 <48> 8b b3 c0 00 00 00 0f b7 8b b2 00 00 00 49 01 ec 48 01 c5
> > > > 48 8d
> > > > [14080.047181] RSP: 0018:ffffa83643a4f818 EFLAGS: 00010246
> > > > [14080.052522] RAX: 00000000000000ce RBX: 0000000000000000 RCX: 0000000000000000
> > > > [14080.059765] RDX: ffffa2ad1403b000 RSI: 0000000000000028 RDI: ffffa2afc9d302d4
> > > > [14080.067012] RBP: ffffa2ad1403b000 R08: 0000000000000022 R09: 00002000001558c9
> > > > [14080.074257] R10: 0000000000000000 R11: ffffa2b02fcea888 R12: 00000000000000e2
> > > > [14080.081502] R13: ffffa2afc9d30200 R14: ffffa2afc9d30200 R15: 00002000001558c9
> > > > [14080.088746] FS: 0000000000000000(0000) GS:ffffa2b02fcc0000(0000)
> > > > knlGS:0000000000000000
> > > > [14080.096964] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > > > [14080.102823] CR2: 00000000000000c0 CR3: 0000000151ff4000 CR4: 00000000003526e0
> > > > [14080.110067] Kernel panic - not syncing: Fatal exception in interrupt
> > > > [14080.325501] Kernel Offset: 0x12600000 from 0xffffffff81000000
> > > > (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
> > > > [14080.353129] ---[ end Kernel panic - not syncing: Fatal exception in
> > > > interrupt ]---
> > >
> > > Could you please provide a decoded stack trace?
> > >
> > > # in your git tree:
> > > cat <stacktrace file > | ./scripts/decode_stacktrace.sh vmlinux
> >
> > I'm afraid it doesn't yield more information, really... I can't say why
> >
> > cat bug.txt | ./scripts/decode_stacktrace.sh vmlinux
> > [14079.678380] BUG: kernel NULL pointer dereference, address: 00000000000000c0
> > [14079.685456] #PF: supervisor read access in kernel mode
> > [14079.690686] #PF: error_code(0x0000) - not-present page
> > [14079.695915] PGD 0 P4D 0
> > [14079.698540] Oops: 0000 [#1] PREEMPT SMP NOPTI
> > [14079.702996] CPU: 11 PID: 891 Comm: napi/eno2-80 Not tainted 6.4.0 #360
> > [14079.709614] Hardware name: Supermicro Super Server/A2SDi-12C-HLN4F,
> > BIOS 1.7a 10/13/2022
> > [14079.717796] RIP: 0010:__udp_gso_segment (??:?)
> > [14079.722778] Code: c3 08 66 89 5c 02 04 45 84 e4 0f 85 27 fd ff ff
> >
> > Code starting with the faulting instruction
> > ===========================================
> > 0: c3 ret
> > 1: 08 66 89 or %ah,-0x77(%rsi)
> > 4: 5c pop %rsp
> > 5: 02 04 45 84 e4 0f 85 add -0x7af01b7c(,%rax,2),%al
> > c: 27 (bad)
> > d: fd std
> > e: ff (bad)
> > f: ff .byte 0xff
> > 49 8b 1e 49 8b ae c0 00 00 00 41 0f b7 86 b4 00 00 00 45 0f b7 a6 b2
> > 00 00 00 <48> 8b b3 c0 00 00 00 0f b7 8b b2 00 00 00 49 01 ec 48 01 c5
> > 48 8d
> > [14079.741645] RSP: 0018:ffffa83643a4f818 EFLAGS: 00010246
> > [14079.746966] RAX: 00000000000000ce RBX: 0000000000000000 RCX: 0000000000000000
> > [14079.754195] RDX: ffffa2ad1403b000 RSI: 0000000000000028 RDI: ffffa2afc9d302d4
> > [14079.761422] RBP: ffffa2ad1403b000 R08: 0000000000000022 R09: 00002000001558c9
> > [14079.768650] R10: 0000000000000000 R11: ffffa2b02fcea888 R12: 00000000000000e2
> > [14079.775879] R13: ffffa2afc9d30200 R14: ffffa2afc9d30200 R15: 00002000001558c9
> > [14079.783106] FS: 0000000000000000(0000) GS:ffffa2b02fcc0000(0000)
> > knlGS:0000000000000000
> > [14079.791305] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [14079.797162] CR2: 00000000000000c0 CR3: 0000000151ff4000 CR4: 00000000003526e0
> > [14079.804408] Call Trace:
> > [14079.806961] <TASK>
> > [14079.809170] ? __die (??:?)
> > [14079.812340] ? page_fault_oops (fault.c:?)
> > [14079.816551] ? ip6_route_output_flags (??:?)
> > [14079.821284] ? exc_page_fault (??:?)
> > [14079.825408] ? update_load_avg (fair.c:?)
> > [14079.829534] ? asm_exc_page_fault (??:?)
> > [14079.833836] ? __udp_gso_segment (??:?)
> > [14079.838218] ? __udp_gso_segment (??:?)
> > [14079.842600] ? _raw_spin_unlock_irqrestore (??:?)
> > [14079.847679] ? try_to_wake_up (core.c:?)
> > [14079.851713] inet_gso_segment (??:?)
> > [14079.855827] ? vhost_poll_wakeup (vhost.c:?)
> > [14079.860032] skb_mac_gso_segment (??:?)
> > [14079.864331] __skb_gso_segment (??:?)
> > [14079.868455] ? netif_skb_features (??:?)
> > [14079.872928] validate_xmit_skb (dev.c:?)
> > [14079.877139] validate_xmit_skb_list (??:?)
> > [14079.881612] sch_direct_xmit (??:?)
> > [14079.885641] __qdisc_run (??:?)
> > [14079.889324] __dev_queue_xmit (??:?)
> > [14079.893450] ? nf_hook_slow (??:?)
> > [14079.897229] br_dev_queue_push_xmit (??:?)
> > [14079.901788] maybe_deliver (br_forward.c:?)
> > [14079.905564] br_flood (??:?)
> > [14079.908903] br_handle_frame_finish (??:?)
> > [14079.913547] br_handle_frame (br_input.c:?)
> > [14079.917585] ? ipv6_find_hdr (??:?)
> > [14079.921622] ? br_handle_local_finish (??:?)
> > [14079.926267] __netif_receive_skb_core.constprop.0 (dev.c:?)
> > [14079.932125] ? br_handle_frame_finish (br_input.c:?)
> > [14079.936946] ? ___slab_alloc (slub.c:?)
> > [14079.940986] __netif_receive_skb_list_core (dev.c:?)
> > [14079.946240] netif_receive_skb_list_internal (??:?)
> > [14079.951660] ? napi_gro_flush (??:?)
> > [14079.955604] napi_complete_done (??:?)
> > [14079.959808] ixgbe_poll (??:?)
> > [14079.963506] __napi_poll (dev.c:?)
> > [14079.967106] napi_threaded_poll (dev.c:?)
> > [14079.971405] ? __napi_poll (dev.c:?)
> > [14079.975260] kthread (kthread.c:?)
> > [14079.978510] ? kthread_complete_and_exit (kthread.c:?)
> > [14079.983415] ret_from_fork (??:?)
> > [14079.987102] </TASK>
> > [14079.989395] Modules linked in: chaoskey
> > [14079.993347] CR2: 00000000000000c0
> > [14079.996773] ---[ end trace 0000000000000000 ]---
> > [14080.018013] pstore: backend (erst) writing error (-28)
> > [14080.023274] RIP: 0010:__udp_gso_segment (??:?)
> > [14080.028264] Code: c3 08 66 89 5c 02 04 45 84 e4 0f 85 27 fd ff ff
> >
> > Code starting with the faulting instruction
> > ===========================================
> > 0: c3 ret
> > 1: 08 66 89 or %ah,-0x77(%rsi)
> > 4: 5c pop %rsp
> > 5: 02 04 45 84 e4 0f 85 add -0x7af01b7c(,%rax,2),%al
> > c: 27 (bad)
> > d: fd std
> > e: ff (bad)
> > f: ff .byte 0xff
> > 49 8b 1e 49 8b ae c0 00 00 00 41 0f b7 86 b4 00 00 00 45 0f b7 a6 b2
> > 00 00 00 <48> 8b b3 c0 00 00 00 0f b7 8b b2 00 00 00 49 01 ec 48 01 c5
> > 48 8d
> > [14080.047181] RSP: 0018:ffffa83643a4f818 EFLAGS: 00010246
> > [14080.052522] RAX: 00000000000000ce RBX: 0000000000000000 RCX: 0000000000000000
> > [14080.059765] RDX: ffffa2ad1403b000 RSI: 0000000000000028 RDI: ffffa2afc9d302d4
> > [14080.067012] RBP: ffffa2ad1403b000 R08: 0000000000000022 R09: 00002000001558c9
> > [14080.074257] R10: 0000000000000000 R11: ffffa2b02fcea888 R12: 00000000000000e2
> > [14080.081502] R13: ffffa2afc9d30200 R14: ffffa2afc9d30200 R15: 00002000001558c9
> > [14080.088746] FS: 0000000000000000(0000) GS:ffffa2b02fcc0000(0000)
> > knlGS:0000000000000000
> > [14080.096964] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [14080.102823] CR2: 00000000000000c0 CR3: 0000000151ff4000 CR4: 00000000003526e0
> > [14080.110067] Kernel panic - not syncing: Fatal exception in interrupt
> > [14080.325501] Kernel Offset: 0x12600000 from 0xffffffff81000000
> > (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
> > [14080.353129] ---[ end Kernel panic - not syncing: Fatal exception in
> > interrupt ]---
> >
> > The binaries aren't stripped so i don't, currently, know why it's like this...
> >
> > but i also get:
> > gdb vmlinux
> > GNU gdb (Gentoo 13.2 vanilla) 13.2
> > Copyright (C) 2023 Free Software Foundation, Inc.
> > License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
> > This is free software: you are free to change and redistribute it.
> > There is NO WARRANTY, to the extent permitted by law.
> > Type "show copying" and "show warranty" for details.
> > This GDB was configured as "x86_64-pc-linux-gnu".
> > Type "show configuration" for configuration details.
> > For bug reporting instructions, please see:
> > <https://bugs.gentoo.org/>.
> > Find the GDB manual and other documentation resources online at:
> > <http://www.gnu.org/software/gdb/documentation/>.
> >
> > For help, type "help".
> > Type "apropos word" to search for commands related to "word"...
> > Reading symbols from vmlinux...
> > (No debugging symbols found in vmlinux)
> > Traceback (most recent call last):
> > File "/usr/src/linux/vmlinux-gdb.py", line 25, in <module>
> > import linux.constants
> > File "/usr/src/linux/scripts/gdb/linux/constants.py", line 10, in <module>
> > LX_hrtimer_resolution = gdb.parse_and_eval("hrtimer_resolution")
> > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> > gdb.error: 'hrtimer_resolution' has unknown type; cast it to its declared type
> > ---
> >
> > > Thanks!
> > >
> > > Paolo
> > >
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