Re: [Intel-wired-lan] bug with rx-udp-gro-forwarding offloading?

From: Ian Kumlien
Date: Wed Jun 28 2023 - 08:05:09 EST

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In reply to: Ian Kumlien: "Re: [Intel-wired-lan] bug with rx-udp-gro-forwarding offloading?"
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So have some hits, would it be better without your warn on? ... Things
are a bit slow atm - lets just say that i noticed the stacktraces
because a stream stuttered =)

cat bug.txt | ./scripts/decode_stacktrace.sh vmlinux
[ 100.136018] ------------[ cut here ]------------
[ 100.136044] WARNING: CPU: 2 PID: 911 at net/core/skbuff.c:4307
skb_segment_list (net/core/skbuff.c:4307)
[ 100.136085] Modules linked in: chaoskey
[ 100.136113] CPU: 2 PID: 911 Comm: napi/eno1-67 Not tainted 6.4.0-dirty #367
[ 100.136135] Hardware name: Supermicro Super Server/A2SDi-12C-HLN4F,
BIOS 1.7a 10/13/2022
[ 100.136148] RIP: 0010:skb_segment_list (net/core/skbuff.c:4307)
[ 100.136169] Code: e9 21 fe ff ff 48 8b ac 24 a0 00 00 00 89 3c 24 e8
8e 5b c9 fd 8b 34 24 48 c7 c1 00 bc 3e 99 4c 89 ef 48 89 ea e8 19 97
fd ff <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 fa 48 c1 ea 03 80 3c
02
All code
========
0: e9 21 fe ff ff jmp 0xfffffffffffffe26
5: 48 8b ac 24 a0 00 00 mov 0xa0(%rsp),%rbp
c: 00
d: 89 3c 24 mov %edi,(%rsp)
10: e8 8e 5b c9 fd call 0xfffffffffdc95ba3
15: 8b 34 24 mov (%rsp),%esi
18: 48 c7 c1 00 bc 3e 99 mov $0xffffffff993ebc00,%rcx
1f: 4c 89 ef mov %r13,%rdi
22: 48 89 ea mov %rbp,%rdx
25: e8 19 97 fd ff call 0xfffffffffffd9743
2a:* 0f 0b ud2 <-- trapping instruction
2c: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
33: fc ff df
36: 4c 89 fa mov %r15,%rdx
39: 48 c1 ea 03 shr $0x3,%rdx
3d: 80 .byte 0x80
3e: 3c 02 cmp $0x2,%al

Code starting with the faulting instruction
===========================================
0: 0f 0b ud2
2: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
9: fc ff df
c: 4c 89 fa mov %r15,%rdx
f: 48 c1 ea 03 shr $0x3,%rdx
13: 80 .byte 0x80
14: 3c 02 cmp $0x2,%al
[ 100.136188] RSP: 0018:ffff88811eea6fb0 EFLAGS: 00010212
[ 100.136208] RAX: 00000000000005cc RBX: ffff88814b0da000 RCX: ffffffff97d7acb7
[ 100.136222] RDX: ffff888221044474 RSI: 1ffff11044208891 RDI: 000000000000002a
[ 100.136236] RBP: 00000000000020c0 R08: 0000000000000000 R09: ffff888221044497
[ 100.136248] R10: ffffed1044208892 R11: 0000000000000014 R12: ffff888221044480
[ 100.136261] R13: ffff8882210443c0 R14: dffffc0000000000 R15: ffff88811a6472c0
[ 100.136275] FS: 0000000000000000(0000) GS:ffff88842f300000(0000)
knlGS:0000000000000000
[ 100.136289] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 100.136303] CR2: 0000000000000000 CR3: 0000000120900000 CR4: 00000000003526e0
[ 100.136315] Call Trace:
[ 100.136327] <TASK>
[ 100.136339] ? __warn (kernel/panic.c:673)
[ 100.136361] ? skb_segment_list (net/core/skbuff.c:4307)
[ 100.136379] ? report_bug (lib/bug.c:180 lib/bug.c:219)
[ 100.136400] ? handle_bug (arch/x86/kernel/traps.c:324)
[ 100.136419] ? exc_invalid_op (arch/x86/kernel/traps.c:345 (discriminator 1))
[ 100.136439] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568)
[ 100.136462] ? skb_segment_list (./arch/x86/include/asm/atomic.h:29
./include/linux/atomic/atomic-instrumented.h:28
./include/linux/refcount.h:147 ./include/linux/skbuff.h:1986
net/core/skbuff.c:4281)
[ 100.136482] ? skb_segment_list (net/core/skbuff.c:4307)
[ 100.136503] __udp_gso_segment (net/ipv4/udp_offload.c:255
net/ipv4/udp_offload.c:277)
[ 100.136525] ? nft_masq_init (net/netfilter/nft_masq.c:102)
[ 100.136542] ? ixgbe_xdp_xmit
(drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:8718)
[ 100.136563] inet_gso_segment (net/ipv4/af_inet.c:1399)
[ 100.136582] ? skb_crc32c_csum_help (./include/linux/skbuff.h:2698
./include/linux/skbuff.h:2956 net/core/dev.c:3303)
[ 100.136604] skb_mac_gso_segment (net/core/gro.c:141)
[ 100.136624] ? skb_eth_gso_segment (net/core/gro.c:127)
[ 100.136645] __skb_gso_segment (net/core/dev.c:3403 (discriminator 2))
[ 100.136663] ? netif_skb_features (net/core/dev.c:3474 net/core/dev.c:3563)
[ 100.136683] validate_xmit_skb (./include/linux/netdevice.h:4862
net/core/dev.c:3659)
[ 100.136704] validate_xmit_skb_list (net/core/dev.c:3710)
[ 100.136725] sch_direct_xmit (net/sched/sch_generic.c:330)
[ 100.136745] ? qdisc_put_unlocked (net/sched/sch_generic.c:317)
[ 100.136762] ? _raw_spin_trylock (./arch/x86/include/asm/atomic.h:29
./include/linux/atomic/atomic-instrumented.h:28
./include/asm-generic/qspinlock.h:92 ./include/linux/spinlock.h:192
./include/linux/spinlock_api_smp.h:89 kernel/locking/spinlock.c:138)
[ 100.136783] ? _raw_spin_lock_irqsave (kernel/locking/spinlock.c:137)
[ 100.136835] __dev_queue_xmit (net/core/dev.c:3805 net/core/dev.c:4210)
[ 100.136862] ? ip_finish_output2 (net/ipv4/ip_output.c:196)
[ 100.136883] ? netdev_core_pick_tx (net/core/dev.c:4151)
[ 100.136907] ? ip_setup_cork (net/ipv4/ip_output.c:196)
[ 100.136927] ? __ip_finish_output (net/ipv4/ip_output.c:250
net/ipv4/ip_output.c:302 net/ipv4/ip_output.c:289)
[ 100.136945] ? eth_header (net/ethernet/eth.c:100)
[ 100.136966] ? neigh_resolve_output
(./include/linux/netdevice.h:3140 net/core/neighbour.c:1547
net/core/neighbour.c:1532)
[ 100.136988] neigh_xmit (net/core/neighbour.c:3156)
[ 100.137007] nf_flow_offload_ip_hook (net/netfilter/nf_flow_table_ip.c:418)
[ 100.137032] ? nf_flow_queue_xmit (net/netfilter/nf_flow_table_ip.c:342)
[ 100.137054] ? consume_skb (./arch/x86/include/asm/atomic.h:190
./include/linux/atomic/atomic-instrumented.h:177
./include/linux/refcount.h:272 ./include/linux/refcount.h:315
./include/linux/refcount.h:333 ./include/linux/skbuff.h:1221
net/core/skbuff.c:1240)
[ 100.137071] nf_hook_slow (./include/linux/netfilter.h:143
net/netfilter/core.c:626)
[ 100.137094] __netif_receive_skb_core.constprop.0
(./include/linux/netfilter_netdev.h:34 net/core/dev.c:5274
net/core/dev.c:5361)
[ 100.137120] ? do_xdp_generic (net/core/dev.c:5281)
[ 100.137142] ? __udp4_lib_lookup (net/ipv4/udp.c:531)
[ 100.137164] __netif_receive_skb_list_core (net/core/dev.c:5570)
[ 100.137188] ? __netif_receive_skb_core.constprop.0 (net/core/dev.c:5546)
[ 100.137211] ? load_balance (kernel/sched/fair.c:10908)
[ 100.137230] ? recalibrate_cpu_khz (./arch/x86/include/asm/msr.h:215
arch/x86/kernel/tsc.c:1110)
[ 100.137250] ? ktime_get_with_offset (kernel/time/timekeeping.c:292
(discriminator 3) kernel/time/timekeeping.c:388 (discriminator 3)
kernel/time/timekeeping.c:891 (discriminator 3))
[ 100.137272] netif_receive_skb_list_internal (net/core/dev.c:5638
net/core/dev.c:5727)
[ 100.137295] ? process_backlog (net/core/dev.c:5699)
[ 100.137317] ? napi_gro_complete.constprop.0 (net/core/gro.c:321)
[ 100.137338] ? dev_gro_receive (./arch/x86/include/asm/bitops.h:94
(discriminator 8)
./include/asm-generic/bitops/instrumented-non-atomic.h:45
(discriminator 8) net/core/gro.c:583 (discriminator 8))
[ 100.137357] napi_complete_done (./include/linux/list.h:37
./include/net/gro.h:434 ./include/net/gro.h:429 net/core/dev.c:6067)
[ 100.137378] ? napi_busy_loop (net/core/dev.c:6034)
[ 100.137399] ixgbe_poll (drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:3191)
[ 100.137425] ? ixgbe_xdp_ring_update_tail_locked
(drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:3141)
[ 100.137447] ? io_schedule_timeout (kernel/sched/core.c:6551)
[ 100.137469] __napi_poll (net/core/dev.c:6498)
[ 100.137490] napi_threaded_poll (./include/linux/netpoll.h:89
net/core/dev.c:6640)
[ 100.137513] ? __napi_poll (net/core/dev.c:6625)
[ 100.137531] ? migrate_enable (kernel/sched/core.c:3045)
[ 100.137553] ? __kthread_parkme (./arch/x86/include/asm/bitops.h:207
./arch/x86/include/asm/bitops.h:239
./include/asm-generic/bitops/instrumented-non-atomic.h:142
kernel/kthread.c:271)
[ 100.137572] ? __napi_poll (net/core/dev.c:6625)
[ 100.137591] kthread (kernel/kthread.c:379)
[ 100.137610] ? kthread_complete_and_exit (kernel/kthread.c:336)
[ 100.137631] ret_from_fork (arch/x86/entry/entry_64.S:314)
[ 100.137651] </TASK>
[ 100.137661] ---[ end trace 0000000000000000 ]---

[ 112.103156] ------------[ cut here ]------------
[ 112.103183] WARNING: CPU: 4 PID: 922 at net/core/skbuff.c:4337
skb_segment_list (net/core/skbuff.c:4337 (discriminator 1))
[ 112.103222] Modules linked in: chaoskey
[ 112.103251] CPU: 4 PID: 922 Comm: napi/eno2-80 Tainted: G W
6.4.0-dirty #367
[ 112.103273] Hardware name: Supermicro Super Server/A2SDi-12C-HLN4F,
BIOS 1.7a 10/13/2022
[ 112.103286] RIP: 0010:skb_segment_list (net/core/skbuff.c:4337
(discriminator 1))
[ 112.103308] Code: 41 0f c1 87 d4 00 00 00 85 c0 74 25 8d 50 01 09 c2
78 08 4c 89 f8 e9 28 fa ff ff be 01 00 00 00 48 89 df e8 63 70 a1 fe
eb e9 <0f> 0b e9 df f9 ff ff be 02 00 00 00 48 89 df e8 4d 70 a1 fe eb
d3
All code
========
0: 41 0f c1 87 d4 00 00 xadd %eax,0xd4(%r15)
7: 00
8: 85 c0 test %eax,%eax
a: 74 25 je 0x31
c: 8d 50 01 lea 0x1(%rax),%edx
f: 09 c2 or %eax,%edx
11: 78 08 js 0x1b
13: 4c 89 f8 mov %r15,%rax
16: e9 28 fa ff ff jmp 0xfffffffffffffa43
1b: be 01 00 00 00 mov $0x1,%esi
20: 48 89 df mov %rbx,%rdi
23: e8 63 70 a1 fe call 0xfffffffffea1708b
28: eb e9 jmp 0x13
2a:* 0f 0b ud2 <-- trapping instruction
2c: e9 df f9 ff ff jmp 0xfffffffffffffa10
31: be 02 00 00 00 mov $0x2,%esi
36: 48 89 df mov %rbx,%rdi
39: e8 4d 70 a1 fe call 0xfffffffffea1708b
3e: eb d3 jmp 0x13

Code starting with the faulting instruction
===========================================
0: 0f 0b ud2
2: e9 df f9 ff ff jmp 0xfffffffffffff9e6
7: be 02 00 00 00 mov $0x2,%esi
c: 48 89 df mov %rbx,%rdi
f: e8 4d 70 a1 fe call 0xfffffffffea17061
14: eb d3 jmp 0xffffffffffffffe9
[ 112.103326] RSP: 0018:ffff88811c93ec38 EFLAGS: 00010246
[ 112.103346] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff888218b92848
[ 112.103361] RDX: 1ffff110431724f0 RSI: ffff888218b92834 RDI: 0000000000000000
[ 112.103374] RBP: ffff8881804b6ec0 R08: ffff888218b92840 R09: 1ffff110431724fe
[ 112.103388] R10: ffff8881804b6000 R11: 0000000000000014 R12: 0000000000000000
[ 112.103400] R13: ffff8881804b6ec0 R14: 0000000000000022 R15: ffff888218b92780
[ 112.103414] FS: 0000000000000000(0000) GS:ffff88842f400000(0000)
knlGS:0000000000000000
[ 112.103429] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 112.103442] CR2: 00007fd1aa0419e5 CR3: 00000001287ea000 CR4: 00000000003526e0
[ 112.103456] Call Trace:
[ 112.103467] <TASK>
[ 112.103521] ? __warn (kernel/panic.c:673)
[ 112.103549] ? skb_segment_list (net/core/skbuff.c:4337 (discriminator 1))
[ 112.103569] ? report_bug (lib/bug.c:180 lib/bug.c:219)
[ 112.103590] ? handle_bug (arch/x86/kernel/traps.c:324)
[ 112.103611] ? exc_invalid_op (arch/x86/kernel/traps.c:345 (discriminator 1))
[ 112.103631] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568)
[ 112.103658] ? skb_segment_list (net/core/skbuff.c:4337 (discriminator 1))
[ 112.103678] ? set_track_prepare (mm/slub.c:5682)
[ 112.103696] ? napi_complete_done (./include/linux/list.h:37
./include/net/gro.h:434 ./include/net/gro.h:429 net/core/dev.c:6067)
[ 112.103716] ? pcpu_alloc (mm/percpu-internal.h:129 mm/percpu.c:1880)
[ 112.103734] __udp_gso_segment (net/ipv4/udp_offload.c:255
net/ipv4/udp_offload.c:277)
[ 112.103758] ? _raw_spin_lock_irqsave
(./arch/x86/include/asm/atomic.h:202
./include/linux/atomic/atomic-instrumented.h:543
./include/asm-generic/qspinlock.h:111 ./include/linux/spinlock.h:186
./include/linux/spinlock_api_smp.h:111 kernel/locking/spinlock.c:162)
[ 112.103782] ? _raw_read_unlock_irqrestore (kernel/locking/spinlock.c:161)
[ 112.103804] ? __netif_receive_skb_core.constprop.0 (net/core/dev.c:5387)
[ 112.103826] ? netif_receive_skb_list_internal (net/core/dev.c:5638
net/core/dev.c:5727)
[ 112.103848] inet_gso_segment (net/ipv4/af_inet.c:1399)
[ 112.103868] ? skb_crc32c_csum_help (./include/linux/skbuff.h:2698
./include/linux/skbuff.h:2956 net/core/dev.c:3303)
[ 112.103891] skb_mac_gso_segment (net/core/gro.c:141)
[ 112.103911] ? skb_eth_gso_segment (net/core/gro.c:127)
[ 112.103933] __skb_gso_segment (net/core/dev.c:3403 (discriminator 2))
[ 112.103952] ? netif_skb_features (net/core/dev.c:3474 net/core/dev.c:3563)
[ 112.103973] validate_xmit_skb (./include/linux/netdevice.h:4862
net/core/dev.c:3659)
[ 112.103993] ? kasan_save_stack (mm/kasan/common.c:47)
[ 112.104017] validate_xmit_skb_list (net/core/dev.c:3710)
[ 112.104039] sch_direct_xmit (net/sched/sch_generic.c:330)
[ 112.104058] ? ret_from_fork (arch/x86/entry/entry_64.S:308)
[ 112.104075] ? unwind_next_frame (arch/x86/kernel/unwind_orc.c:195
arch/x86/kernel/unwind_orc.c:469)
[ 112.104098] ? ret_from_fork (arch/x86/entry/entry_64.S:314)
[ 112.104115] ? qdisc_put_unlocked (net/sched/sch_generic.c:317)
[ 112.104133] ? _raw_spin_trylock (./arch/x86/include/asm/atomic.h:29
./include/linux/atomic/atomic-instrumented.h:28
./include/asm-generic/qspinlock.h:92 ./include/linux/spinlock.h:192
./include/linux/spinlock_api_smp.h:89 kernel/locking/spinlock.c:138)
[ 112.104154] ? _raw_spin_lock_irqsave (kernel/locking/spinlock.c:137)
[ 112.104178] __dev_queue_xmit (net/core/dev.c:3805 net/core/dev.c:4210)
[ 112.104200] ? filter_irq_stacks (kernel/stacktrace.c:114)
[ 112.104222] ? netdev_core_pick_tx (net/core/dev.c:4151)
[ 112.104242] ? unwind_next_frame (arch/x86/kernel/unwind_orc.c:381
arch/x86/kernel/unwind_orc.c:623)
[ 112.104264] ? i8237A_resume (./arch/x86/include/asm/dma.h:250
arch/x86/kernel/i8237.c:33)
[ 112.104282] ? ret_from_fork (arch/x86/entry/entry_64.S:308)
[ 112.104298] ? unwind_next_frame (arch/x86/kernel/unwind_orc.c:195
arch/x86/kernel/unwind_orc.c:469)
[ 112.104320] ? ret_from_fork (arch/x86/entry/entry_64.S:314)
[ 112.104337] ? br_handle_frame_finish (net/bridge/br_input.c:215)
[ 112.104359] ? write_profile (kernel/stacktrace.c:86)
[ 112.104379] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24)
[ 112.104398] br_dev_queue_push_xmit (net/bridge/br_forward.c:55)
[ 112.104421] ? stack_trace_save (kernel/stacktrace.c:123)
[ 112.104442] ? br_fdb_offloaded_set (net/bridge/br_forward.c:34)
[ 112.104464] ? nf_hook_slow (./include/linux/netfilter.h:143
net/netfilter/core.c:626)
[ 112.104510] br_forward_finish (./include/linux/netfilter.h:303
./include/linux/netfilter.h:297 net/bridge/br_forward.c:66)
[ 112.104536] ? br_dev_queue_push_xmit (net/bridge/br_forward.c:64)
[ 112.104558] ? maybe_deliver (net/bridge/br_forward.c:125
net/bridge/br_forward.c:189)
[ 112.104577] ? br_flood (net/bridge/br_forward.c:233)
[ 112.104596] ? br_fdb_offloaded_set (net/bridge/br_forward.c:34)
[ 112.104617] ? nf_hook_slow (./include/linux/netfilter.h:143
net/netfilter/core.c:626)
[ 112.104639] __br_forward (./include/linux/netfilter.h:304
./include/linux/netfilter.h:297 net/bridge/br_forward.c:115)
[ 112.104660] ? br_forward_finish (net/bridge/br_forward.c:75)
[ 112.104682] ? br_dev_queue_push_xmit (net/bridge/br_forward.c:64)
[ 112.104703] ? __copy_skb_header (./include/net/dst.h:297
net/core/skbuff.c:1338)
[ 112.104725] ? __skb_clone (./arch/x86/include/asm/atomic.h:95
(discriminator 4) ./include/linux/atomic/atomic-instrumented.h:191
(discriminator 4) net/core/skbuff.c:1409 (discriminator 4))
[ 112.104746] maybe_deliver (net/bridge/br_forward.c:193)
[ 112.104766] ? br_fdb_update (./arch/x86/include/asm/bitops.h:207
./arch/x86/include/asm/bitops.h:239
./include/asm-generic/bitops/instrumented-non-atomic.h:142
net/bridge/br_fdb.c:896)
[ 112.104787] br_flood (net/bridge/br_forward.c:233)
[ 112.104809] br_handle_frame_finish (net/bridge/br_input.c:215)
[ 112.104832] ? br_handle_local_finish (net/bridge/br_input.c:75)
[ 112.104855] ? br_cfm_config_fill_info
(./include/linux/skbuff.h:2527 ./include/net/netlink.h:1815
./include/net/netlink.h:1835 net/bridge/br_cfm_netlink.c:462)
[ 112.104874] ? br_nf_pre_routing_finish (net/bridge/br_netfilter_hooks.c:481)
[ 112.104893] ? unwind_next_frame (arch/x86/kernel/unwind_orc.c:381
arch/x86/kernel/unwind_orc.c:623)
[ 112.104915] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24)
[ 112.104933] ? ret_from_fork (arch/x86/entry/entry_64.S:308)
[ 112.104949] ? unwind_next_frame (arch/x86/kernel/unwind_orc.c:195
arch/x86/kernel/unwind_orc.c:469)
[ 112.104970] ? ret_from_fork (arch/x86/entry/entry_64.S:314)
[ 112.104987] ? br_nf_pre_routing_finish (net/bridge/br_netfilter_hooks.c:481)
[ 112.105006] br_handle_frame (net/bridge/br_input.c:298
net/bridge/br_input.c:416)
[ 112.105028] ? br_handle_frame_finish (net/bridge/br_input.c:321)
[ 112.105050] ? br_handle_local_finish (net/bridge/br_input.c:75)
[ 112.105071] ? packet_rcv (net/packet/af_packet.c:2231)
[ 112.105090] __netif_receive_skb_core.constprop.0 (net/core/dev.c:5387)
[ 112.105112] ? br_handle_frame_finish (net/bridge/br_input.c:321)
[ 112.105135] ? do_xdp_generic (net/core/dev.c:5281)
[ 112.105154] ? udp4_lib_lookup2 (net/ipv4/udp.c:456)
[ 112.105175] ? queued_spin_lock_slowpath
(kernel/locking/qspinlock.c:183 kernel/locking/qspinlock.c:463)
[ 112.105193] ? __udp4_lib_lookup (net/ipv4/udp.c:531)
[ 112.105215] __netif_receive_skb_list_core (net/core/dev.c:5570)
[ 112.105239] ? __netif_receive_skb_core.constprop.0 (net/core/dev.c:5546)
[ 112.105262] ? load_balance (kernel/sched/fair.c:10908)
[ 112.105281] ? recalibrate_cpu_khz (./arch/x86/include/asm/msr.h:215
arch/x86/kernel/tsc.c:1110)
[ 112.105302] ? ktime_get_with_offset (kernel/time/timekeeping.c:292
(discriminator 3) kernel/time/timekeeping.c:388 (discriminator 3)
kernel/time/timekeeping.c:891 (discriminator 3))
[ 112.105323] netif_receive_skb_list_internal (net/core/dev.c:5638
net/core/dev.c:5727)
[ 112.105346] ? process_backlog (net/core/dev.c:5699)
[ 112.105368] ? napi_gro_flush (./arch/x86/include/asm/bitops.h:94
./include/asm-generic/bitops/instrumented-non-atomic.h:45
net/core/gro.c:346 net/core/gro.c:361)
[ 112.105386] ? dev_gro_receive (./arch/x86/include/asm/bitops.h:68
(discriminator 8)
./include/asm-generic/bitops/instrumented-non-atomic.h:29
(discriminator 8) net/core/gro.c:581 (discriminator 8))
[ 112.105405] napi_complete_done (./include/linux/list.h:37
./include/net/gro.h:434 ./include/net/gro.h:429 net/core/dev.c:6067)
[ 112.105425] ? napi_busy_loop (net/core/dev.c:6034)
[ 112.105447] ixgbe_poll (drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:3191)
[ 112.105468] ? attach_entity_load_avg (kernel/sched/pelt.h:44
kernel/sched/fair.c:4162)
[ 112.105514] ? ixgbe_xdp_ring_update_tail_locked
(drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:3141)
[ 112.105544] __napi_poll (net/core/dev.c:6498)
[ 112.105566] napi_threaded_poll (./include/linux/netpoll.h:89
net/core/dev.c:6640)
[ 112.105589] ? __napi_poll (net/core/dev.c:6625)
[ 112.105608] ? migrate_enable (kernel/sched/core.c:3045)
[ 112.105630] ? __kthread_parkme (./arch/x86/include/asm/bitops.h:207
./arch/x86/include/asm/bitops.h:239
./include/asm-generic/bitops/instrumented-non-atomic.h:142
kernel/kthread.c:271)
[ 112.105649] ? __napi_poll (net/core/dev.c:6625)
[ 112.105668] kthread (kernel/kthread.c:379)
[ 112.105687] ? kthread_complete_and_exit (kernel/kthread.c:336)
[ 112.105708] ret_from_fork (arch/x86/entry/entry_64.S:314)
[ 112.105729] </TASK>
[ 112.105739] ---[ end trace 0000000000000000 ]---

On Wed, Jun 28, 2023 at 1:47 PM Ian Kumlien <ian.kumlien@xxxxxxxxx> wrote:
>
> On Wed, Jun 28, 2023 at 11:06 AM Paolo Abeni <pabeni@xxxxxxxxxx> wrote:
> >
> > Hello,
> >
> > On Wed, 2023-06-28 at 09:37 +0200, Ian Kumlien wrote:
> > > Been running all night but eventually it crashed again...
> > >
> > > [21753.055795] Out of memory: Killed process 970 (qemu-system-x86)
> > > total-vm:4709488kB, anon-rss:2172652kB, file-rss:4608kB,
> > > shmem-rss:0kB, UID:77 pgtables:4800kB oom_score_adj:0
> > > [24249.061154] general protection fault, probably for non-canonical
> > > address 0xb0746d4e6bee35e2: 0000 [#1] PREEMPT SMP NOPTI
> > > [24249.072138] CPU: 0 PID: 893 Comm: napi/eno1-68 Tainted: G W
> > > 6.4.0-dirty #366
> > > [24249.080670] Hardware name: Supermicro Super Server/A2SDi-12C-HLN4F,
> > > BIOS 1.7a 10/13/2022
> > > [24249.088852] RIP: 0010:kmem_cache_alloc_bulk (mm/slub.c:377
> > > mm/slub.c:388 mm/slub.c:395 mm/slub.c:3963 mm/slub.c:4026)
> > > [24249.094086] Code: 0f 84 46 ff ff ff 65 ff 05 a4 bd e4 47 48 8b 4d
> > > 00 65 48 03 0d e8 5f e3 47 9c 5e fa 45 31 d2 eb 2f 8b 45 28 48 01 d0
> > > 48 89 c7 <48> 8b 00 48 33 85 b8 00 00 00 48 0f cf 48 31 f8 48 89 01 49
> > > 89 17
> > > All code
> > > ========
> > > 0: 0f 84 46 ff ff ff je 0xffffffffffffff4c
> > > 6: 65 ff 05 a4 bd e4 47 incl %gs:0x47e4bda4(%rip) # 0x47e4bdb1
> > > d: 48 8b 4d 00 mov 0x0(%rbp),%rcx
> > > 11: 65 48 03 0d e8 5f e3 add %gs:0x47e35fe8(%rip),%rcx # 0x47e36001
> > > 18: 47
> > > 19: 9c pushf
> > > 1a: 5e pop %rsi
> > > 1b: fa cli
> > > 1c: 45 31 d2 xor %r10d,%r10d
> > > 1f: eb 2f jmp 0x50
> > > 21: 8b 45 28 mov 0x28(%rbp),%eax
> > > 24: 48 01 d0 add %rdx,%rax
> > > 27: 48 89 c7 mov %rax,%rdi
> > > 2a:* 48 8b 00 mov (%rax),%rax <-- trapping instruction
> > > 2d: 48 33 85 b8 00 00 00 xor 0xb8(%rbp),%rax
> > > 34: 48 0f cf bswap %rdi
> > > 37: 48 31 f8 xor %rdi,%rax
> > > 3a: 48 89 01 mov %rax,(%rcx)
> > > 3d: 49 89 17 mov %rdx,(%r15)
> > >
> > > Code starting with the faulting instruction
> > > ===========================================
> > > 0: 48 8b 00 mov (%rax),%rax
> > > 3: 48 33 85 b8 00 00 00 xor 0xb8(%rbp),%rax
> > > a: 48 0f cf bswap %rdi
> > > d: 48 31 f8 xor %rdi,%rax
> > > 10: 48 89 01 mov %rax,(%rcx)
> > > 13: 49 89 17 mov %rdx,(%r15)
> > > [24249.112951] RSP: 0018:ffff9fc303973d20 EFLAGS: 00010086
> > > [24249.118275] RAX: b0746d4e6bee35e2 RBX: 0000000000000001 RCX: ffff8d5a2fa31da0
> > > [24249.125501] RDX: b0746d4e6bee3572 RSI: 0000000000000286 RDI: b0746d4e6bee35e2
> > > [24249.132730] RBP: ffff8d56c016d500 R08: 0000000000000400 R09: ffff8d56ede0e67a
> > > [24249.139958] R10: 0000000000000001 R11: ffff8d56c59d88c0 R12: 0000000000000010
> > > [24249.147187] R13: 0000000000000820 R14: ffff8d5a2fa2a810 R15: ffff8d5a2fa2a818
> > > [24249.154415] FS: 0000000000000000(0000) GS:ffff8d5a2fa00000(0000)
> > > knlGS:0000000000000000
> > > [24249.162620] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > > [24249.168471] CR2: 00007f0f3f7f8760 CR3: 0000000102466000 CR4: 00000000003526f0
> > > [24249.175717] Call Trace:
> > > [24249.178268] <TASK>
> > > [24249.180476] ? die_addr (arch/x86/kernel/dumpstack.c:421
> > > arch/x86/kernel/dumpstack.c:460)
> > > [24249.183907] ? exc_general_protection (arch/x86/kernel/traps.c:783
> > > arch/x86/kernel/traps.c:728)
> > > [24249.188726] ? asm_exc_general_protection
> > > (./arch/x86/include/asm/idtentry.h:564)
> > > [24249.193720] ? kmem_cache_alloc_bulk (mm/slub.c:377 mm/slub.c:388
> > > mm/slub.c:395 mm/slub.c:3963 mm/slub.c:4026)
> > > [24249.198361] ? netif_receive_skb_list_internal (net/core/dev.c:5729)
> > > [24249.203960] napi_skb_cache_get (net/core/skbuff.c:338)
> > > [24249.208078] __napi_build_skb (net/core/skbuff.c:517)
> > > [24249.211934] napi_build_skb (net/core/skbuff.c:541)
> > > [24249.215616] ixgbe_poll
> > > (drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:2165
> > > drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:2361
> > > drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:3178)
> > > [24249.219305] __napi_poll (net/core/dev.c:6498)
> > > [24249.222905] napi_threaded_poll (./include/linux/netpoll.h:89
> > > net/core/dev.c:6640)
> > > [24249.227197] ? __napi_poll (net/core/dev.c:6625)
> > > [24249.231050] kthread (kernel/kthread.c:379)
> > > [24249.234300] ? kthread_complete_and_exit (kernel/kthread.c:332)
> > > [24249.239207] ret_from_fork (arch/x86/entry/entry_64.S:314)
> > > [24249.242892] </TASK>
> > > [24249.245185] Modules linked in: chaoskey
> > > [24249.249133] ---[ end trace 0000000000000000 ]---
> > > [24249.270157] pstore: backend (erst) writing error (-28)
> > > [24249.275408] RIP: 0010:kmem_cache_alloc_bulk (mm/slub.c:377
> > > mm/slub.c:388 mm/slub.c:395 mm/slub.c:3963 mm/slub.c:4026)
> > > [24249.280660] Code: 0f 84 46 ff ff ff 65 ff 05 a4 bd e4 47 48 8b 4d
> > > 00 65 48 03 0d e8 5f e3 47 9c 5e fa 45 31 d2 eb 2f 8b 45 28 48 01 d0
> > > 48 89 c7 <48> 8b 00 48 33 85 b8 00 00 00 48 0f cf 48 31 f8 48 89 01 49
> > > 89 17
> > > All code
> > > ========
> > > 0: 0f 84 46 ff ff ff je 0xffffffffffffff4c
> > > 6: 65 ff 05 a4 bd e4 47 incl %gs:0x47e4bda4(%rip) # 0x47e4bdb1
> > > d: 48 8b 4d 00 mov 0x0(%rbp),%rcx
> > > 11: 65 48 03 0d e8 5f e3 add %gs:0x47e35fe8(%rip),%rcx # 0x47e36001
> > > 18: 47
> > > 19: 9c pushf
> > > 1a: 5e pop %rsi
> > > 1b: fa cli
> > > 1c: 45 31 d2 xor %r10d,%r10d
> > > 1f: eb 2f jmp 0x50
> > > 21: 8b 45 28 mov 0x28(%rbp),%eax
> > > 24: 48 01 d0 add %rdx,%rax
> > > 27: 48 89 c7 mov %rax,%rdi
> > > 2a:* 48 8b 00 mov (%rax),%rax <-- trapping instruction
> > > 2d: 48 33 85 b8 00 00 00 xor 0xb8(%rbp),%rax
> > > 34: 48 0f cf bswap %rdi
> > > 37: 48 31 f8 xor %rdi,%rax
> > > 3a: 48 89 01 mov %rax,(%rcx)
> > > 3d: 49 89 17 mov %rdx,(%r15)
> > >
> > > Code starting with the faulting instruction
> > > ===========================================
> > > 0: 48 8b 00 mov (%rax),%rax
> > > 3: 48 33 85 b8 00 00 00 xor 0xb8(%rbp),%rax
> > > a: 48 0f cf bswap %rdi
> > > d: 48 31 f8 xor %rdi,%rax
> > > 10: 48 89 01 mov %rax,(%rcx)
> > > 13: 49 89 17 mov %rdx,(%r15)
> > > [24249.299578] RSP: 0018:ffff9fc303973d20 EFLAGS: 00010086
> > > [24249.304917] RAX: b0746d4e6bee35e2 RBX: 0000000000000001 RCX: ffff8d5a2fa31da0
> > > [24249.312161] RDX: b0746d4e6bee3572 RSI: 0000000000000286 RDI: b0746d4e6bee35e2
> > > [24249.319407] RBP: ffff8d56c016d500 R08: 0000000000000400 R09: ffff8d56ede0e67a
> > > [24249.326651] R10: 0000000000000001 R11: ffff8d56c59d88c0 R12: 0000000000000010
> > > [24249.333896] R13: 0000000000000820 R14: ffff8d5a2fa2a810 R15: ffff8d5a2fa2a818
> > > [24249.341141] FS: 0000000000000000(0000) GS:ffff8d5a2fa00000(0000)
> > > knlGS:0000000000000000
> > > [24249.349356] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > > [24249.355206] CR2: 00007f0f3f7f8760 CR3: 0000000102466000 CR4: 00000000003526f0
> > > [24249.362452] Kernel panic - not syncing: Fatal exception in interrupt
> > > [24249.566854] Kernel Offset: 0x36e00000 from 0xffffffff81000000
> > > (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
> > > [24249.594124] ---[ end Kernel panic - not syncing: Fatal exception in
> > > interrupt ]---
> > >
> > > It's also odd that i get a OOM - it only seems to happen when i enable
> > > rx-gro-list
> >
> > Unfortunately, not the result I was looking for. That leads to more
> > questions then answer, I'm sorry.
>
> I understand you...
>
> > How long did the host keep going with rx-gro-list enabled?
>
> Well, hours...
>
> reboot system boot 6.4.0-dirty Wed Jun 28 04:20 - 13:39 (09:19)
> reboot system boot 6.4.0-dirty Tue Jun 27 21:31 - 13:39 (16:08)
>
> So, lets imagine a few seconds to login and enable everything
>
> > Did you observe the WARN_ON() introduced by the tentative fix?
>
> I could only see the console, so saw nothing...
>
> > > - it's also odd because this machine always has ~8GB of
> > > memory available
> >
> > It looks like there is a memory leak somewhere, and I don't think the
> > tentative fixup introduced such issue.
>
> I agree, it was there before...
>
> > It looks like the above splat is due to a slab corruption, which in
> > turn could be unrelated from the mentioned leak, but it could/should
> > be related to rx-gro-list.
>
> Agreed =)
>
> > Could you please run the test with both kmemleak and kasan enabled?
>
> Machine-slowdown-enabled^tm
>
> > Additionally could you please disclose if you have non trivial
> > netfilter and/or bridge filter and/or tc rules possibly modifying the
> > incoming/egress packets?
>
> I only have basic reject accept rules, some snat/dnat pairs, but i
> don't see it ending up in "non trivial" ;)
>
> > If kasan is not an option, could you please apply the debug the patch
> > below? (on top of the previous one)
>
> I actually did both, if it's unrelated we should know as well..
>
> I hope i have something for you before tomorrow, else there will be a
> bit of a break until next week
>
> > Thanks!
> >
> > Paolo
> > ---
> > diff --git a/net/core/skbuff.c b/net/core/skbuff.c
> > index 6c5915efbc17..94adca27b205 100644
> > --- a/net/core/skbuff.c
> > +++ b/net/core/skbuff.c
> > @@ -4295,6 +4295,8 @@ struct sk_buff *skb_segment_list(struct sk_buff *skb,
> > delta_len += nskb->len;
> >
> > skb_push(nskb, -skb_network_offset(nskb) + offset);
> > + if (WARN_ON_ONCE(nskb->data - skb->head > skb->tail))
> > + goto err_linearize;
> >
> > skb_release_head_state(nskb);
> > len_diff = skb_network_header_len(nskb) - skb_network_header_len(skb);
> > @@ -4302,6 +4304,11 @@ struct sk_buff *skb_segment_list(struct sk_buff *skb,
> >
> > skb_headers_offset_update(nskb, skb_headroom(nskb) - skb_headroom(skb));
> > nskb->transport_header += len_diff;
> > + if (WARN_ON_ONCE(tnl_hlen > skb_headroom(nskb)))
> > + goto err_linearize;
> > + if (WARN_ON_ONCE(skb_headroom(nskb) + offset > nskb->tail))
> > + goto err_linearize;
> > +
> > skb_copy_from_linear_data_offset(skb, -tnl_hlen,
> > nskb->data - tnl_hlen,
> > offset + tnl_hlen);
> >
> >

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