Hi, this has come up a few times while running selftests and seems
real enough to warrant investigation.
Thanks!
[ 3.680829] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
[ 3.681300] CPU: 2 PID: 189 Comm: test_progs Tainted: G O
5.15.0-rc1-00386-g92da3969a45c-dirty #17
[ 3.682213] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS 1.13.0-1ubuntu1.1 04/01/2014
[ 3.683005] RIP: 0010:bpf_prog_a554d890de36669a_trace_kfree_skb+0xa4/0x9c4
[ 3.683610] Code: f6 75 04 31 f6 eb 04 49 8b 76 08 48 89 75 d0 48
85 ff 75 05 45 31 ed eb 07 44 8b af d0 00 00 00 44 89 6d f0 48 85 c9
75 04 31 <ff> eb 05 48 0f b6 79 08 89 7d e8 40 88 7d f8 48 85 c9 75 04
31 ff
[ 3.685251] RSP: 0018:ffffc9000015cca0 EFLAGS: 00010206
[ 3.685714] RAX: 0000000000000133 RBX: ffff888100970600 RCX: ffff888081af4310
[ 3.686328] RDX: ffffffff81183d10 RSI: 0000000000000000 RDI: 0101000180000300
[ 3.686971] RBP: ffff888100970600 R08: 0000000000000050 R09: 2914518100000000
[ 3.687588] R10: 0000000000000001 R11: 0000000000000000 R12: ffff888108668d00
[ 3.688217] R13: 0000000000000000 R14: 0000000000000000 R15: ffff88810634002c
[ 3.688836] FS: 00007f7f204c1740(0000) GS:ffff88813ba80000(0000)
knlGS:0000000000000000
[ 3.689552] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 3.690057] CR2: 00007f7f204bfef8 CR3: 0000000103bd0001 CR4: 0000000000370ee0
[ 3.690663] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 3.691243] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 3.691783] Call Trace:
[ 3.691982] <IRQ>
[ 3.692143] ? bpf_trace_run2+0x75/0x150
[ 3.692450] ? udp_read_sock+0x41/0xb0
[ 3.692744] ? kfree_skb+0x7e/0x120
[ 3.693029] ? udp_read_sock+0x41/0xb0
[ 3.693333] ? sk_psock_verdict_data_ready+0x4c/0x60
[ 3.693754] ? __udp_enqueue_schedule_skb+0x161/0x260
[ 3.694191] ? udp_queue_rcv_one_skb+0x330/0x590
[ 3.694593] ? udp_unicast_rcv_skb.isra.0+0x6b/0x80
[ 3.695017] ? ip_protocol_deliver_rcu+0x2a/0x290
[ 3.695416] ? ip_local_deliver_finish+0x83/0x120
[ 3.695797] ? ip_local_deliver+0x5e/0x200
[ 3.696153] ? ip_rcv+0x44/0x1e0
[ 3.696436] ? lock_acquire+0xc6/0x2c0
[ 3.696767] ? __netif_receive_skb_one_core+0x45/0x50
[ 3.697207] ? process_backlog+0xcc/0x220
[ 3.697562] ? __napi_poll+0x26/0x1d0
[ 3.697883] ? net_rx_action+0xdd/0x200
[ 3.698223] ? __do_softirq+0xd9/0x488
[ 3.698545] ? ip_finish_output2+0x236/0x960
[ 3.698913] ? do_softirq+0xa2/0xd0
[ 3.699225] </IRQ>
[ 3.699414] ? __local_bh_enable_ip+0xc4/0xe0
[ 3.699782] ? ip_finish_output2+0x25a/0x960
[ 3.700152] ? ip_output+0x6f/0x230
[ 3.700460] ? ip_output+0x6f/0x230
[ 3.700760] ? __ip_finish_output+0x450/0x450
[ 3.701142] ? ip_send_skb+0x15/0x40
[ 3.701460] ? udp_send_skb.isra.0+0x156/0x390
[ 3.701840] ? udp_sendmsg+0xa2c/0xd30
[ 3.702173] ? ip_reply_glue_bits+0x40/0x40
[ 3.702526] ? __lock_acquire+0x378/0x2730
[ 3.702876] ? lock_is_held_type+0xd5/0x130
[ 3.703250] ? sock_sendmsg+0x33/0x40
[ 3.703570] ? sock_sendmsg+0x33/0x40
[ 3.703888] ? sock_write_iter+0x95/0xf0
[ 3.704239] ? new_sync_write+0x172/0x180
[ 3.704589] ? vfs_write+0x25e/0x3d0
[ 3.704902] ? ksys_write+0x93/0xd0
[ 3.705212] ? do_syscall_64+0x35/0x80
[ 3.705534] ? entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 3.705989] Modules linked in: bpf_testmod(O)
[ 3.706368] ---[ end trace 8c7957c205f7cff3 ]---
[ 3.706753] RIP: 0010:bpf_prog_a554d890de36669a_trace_kfree_skb+0xa4/0x9c4
[ 3.707328] Code: f6 75 04 31 f6 eb 04 49 8b 76 08 48 89 75 d0 48
85 ff 75 05 45 31 ed eb 07 44 8b af d0 00 00 00 44 89 6d f0 48 85 c9
75 04 31 <ff> eb 05 48 0f b6 79 08 89 7d e8 40 88 7d f8 48 85 c9 75 04
31 ff
[ 3.708914] RSP: 0018:ffffc9000015cca0 EFLAGS: 00010206
[ 3.709374] RAX: 0000000000000133 RBX: ffff888100970600 RCX: ffff888081af4310
[ 3.710005] RDX: ffffffff81183d10 RSI: 0000000000000000 RDI: 0101000180000300
[ 3.710603] RBP: ffff888100970600 R08: 0000000000000050 R09: 2914518100000000
[ 3.711205] R10: 0000000000000001 R11: 0000000000000000 R12: ffff888108668d00
[ 3.711807] R13: 0000000000000000 R14: 0000000000000000 R15: ffff88810634002c
[ 3.712420] FS: 00007f7f204c1740(0000) GS:ffff88813ba80000(0000)
knlGS:0000000000000000
[ 3.713121] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 3.713614] CR2: 00007f7f204bfef8 CR3: 0000000103bd0001 CR4: 0000000000370ee0
[ 3.714224] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 3.714825] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 3.715444] Kernel panic - not syncing: Fatal exception in interrupt
[ 3.716269] Kernel Offset: disabled
[ 3.716582] ---[ end Kernel panic - not syncing: Fatal exception in
interrupt ]---
