Hi Paolo, Our test system detected a kernel oops. Looks like a problem in the "udp: refactor memory accounting" series.
# good: [f970bd9e3a06f06df8d8ecf1f8ad2c8615cc17eb] udp: implement memory accounting helpers git bisect good f970bd9e3a06f06df8d8ecf1f8ad2c8615cc17eb # bad: [2d0e30c30f84d08dc16f0f2af41f1b8a85f0755e] bpf: add helper for retrieving current numa node id git bisect bad 2d0e30c30f84d08dc16f0f2af41f1b8a85f0755e # bad: [a10b91b8b81c29b87ff5a6d58c1402898337b956] Merge branch 'udpmem' git bisect bad a10b91b8b81c29b87ff5a6d58c1402898337b956 # good: [850cbaddb52dfd4e0c7cabe2c168dd34b44ae0b9] udp: use it's own memory accounting schema git bisect good 850cbaddb52dfd4e0c7cabe2c168dd34b44ae0b9 # first bad commit: [a10b91b8b81c29b87ff5a6d58c1402898337b956] Merge branch 'udpmem' [ 112.472363] BUG: unable to handle kernel NULL pointer dereference at (null) [ 112.473360] IP: [<ffffffffb76f8031>] __sk_mem_raise_allocated+0x31/0x3f0 [ 112.474156] PGD 62a08067 [ 112.474455] PUD 2b8bf067 PMD 0 [ 112.474856] [ 112.475054] Oops: 0002 [#1] SMP [ 112.475431] Modules linked in: nf_conntrack_netlink udp_diag tcp_diag inet_diag netlink_diag af_packet_diag unix_diag binfmt_misc nf_conntrack_ipv6 nf_defrag_ipv6 nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack nfnetlink ip6table_filter ip6_tables ppdev sunrpc crc32c_intel joydev virtio_balloon virtio_net i2c_piix4 parport_pc parport acpi_cpufreq tpm_tis tpm_tis_core tpm virtio_blk serio_raw virtio_pci virtio_ring virtio ata_generic pata_acpi [ 112.480594] CPU: 1 PID: 7405 Comm: socket_udplite Not tainted 4.8.0+ #84 [ 112.481377] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-1.fc24 04/01/2014 [ 112.482375] task: ffff928a5b5fa540 task.stack: ffffb3b484a0c000 [ 112.483059] RIP: 0010:[<ffffffffb76f8031>] [<ffffffffb76f8031>] __sk_mem_raise_allocated+0x31/0x3f0 [ 112.484135] RSP: 0018:ffff928abfd03b18 EFLAGS: 00010296 [ 112.484758] RAX: 0000000000000001 RBX: ffff928aa293cfc0 RCX: 0000000000000001 [ 112.485585] RDX: 0000000000000000 RSI: 0000000000001000 RDI: ffff928aa293cfc0 [ 112.486414] RBP: ffff928abfd03b48 R08: 0de4c53600000000 R09: 0000000000000000 [ 112.487241] R10: 000000006226b971 R11: 0000000000000000 R12: ffff928aa293cfc0 [ 112.488064] R13: 0000000000000001 R14: ffffffffb7f0d5a0 R15: 0000000000001000 [ 112.488893] FS: 00007f058067a700(0000) GS:ffff928abfd00000(0000) knlGS:0000000000000000 [ 112.489807] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 112.490447] CR2: 0000000000000000 CR3: 000000002b8f5000 CR4: 00000000000006e0 [ 112.491248] DR0: 00000000000100a0 DR1: 0000000000000000 DR2: 0000000000000000 [ 112.492025] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 [ 112.492808] Stack: [ 112.493038] 0000000100000300 ffff928aa293cfc0 ffff928a651b9c00 0000000000000300 [ 112.493912] ffff928aa293d108 0000000000001000 ffff928abfd03b88 ffffffffb779e094 [ 112.494782] ffff928abfd03b70 ffff928a651b9c00 ffff928aa293cfc0 0000000000000000 [ 112.495653] Call Trace: [ 112.495930] <IRQ> [ 112.496154] [<ffffffffb779e094>] __udp_enqueue_schedule_skb+0xc4/0x170 [ 112.496896] [<ffffffffb77a15b4>] udp_queue_rcv_skb+0x1a4/0x5b0 [ 112.497551] [<ffffffffb77a1f3e>] __udp4_lib_rcv+0x57e/0xe30 [ 112.498173] [<ffffffffb77a2cfa>] udplite_rcv+0x1a/0x20 [ 112.498761] [<ffffffffb776799f>] ip_local_deliver_finish+0xdf/0x370 [ 112.499466] [<ffffffffb77678ef>] ? ip_local_deliver_finish+0x2f/0x370 [ 112.500184] [<ffffffffb77683c4>] ip_local_deliver+0x74/0x210 [ 112.500825] [<ffffffffb77683ec>] ? ip_local_deliver+0x9c/0x210 [ 112.501482] [<ffffffffb77678c0>] ? inet_del_offload+0x40/0x40 [ 112.502122] [<ffffffffb7767daa>] ip_rcv_finish+0x17a/0x540 [ 112.502749] [<ffffffffb77687f3>] ip_rcv+0x293/0x4d0 [ 112.503305] [<ffffffffb776882f>] ? ip_rcv+0x2cf/0x4d0 [ 112.503873] [<ffffffffb7767c30>] ? ip_local_deliver_finish+0x370/0x370 [ 112.504607] [<ffffffffb771683b>] __netif_receive_skb_core+0x34b/0xca0 [ 112.505327] [<ffffffffb77180e4>] ? process_backlog+0xd4/0x240 [ 112.505967] [<ffffffffb77180e4>] ? process_backlog+0xd4/0x240 [ 112.506617] [<ffffffffb77171a8>] __netif_receive_skb+0x18/0x60 [ 112.507277] [<ffffffffb7718088>] process_backlog+0x78/0x240 [ 112.507904] [<ffffffffb77180e4>] ? process_backlog+0xd4/0x240 [ 112.508552] [<ffffffffb7717e01>] net_rx_action+0x1d1/0x3e0 [ 112.509165] [<ffffffffb7873b3d>] __do_softirq+0xcd/0x471 [ 112.509765] [<ffffffffb776d312>] ? ip_finish_output2+0x242/0x640 [ 112.510446] [<ffffffffb7871ecc>] do_softirq_own_stack+0x1c/0x30 [ 112.511106] <EOI> [ 112.511336] [<ffffffffb709c956>] do_softirq.part.14+0x46/0x70 [ 112.511990] [<ffffffffb709ca39>] __local_bh_enable_ip+0xb9/0xc0 [ 112.512661] [<ffffffffb776d33b>] ip_finish_output2+0x26b/0x640 [ 112.513319] [<ffffffffb776d177>] ? ip_finish_output2+0xa7/0x640 [ 112.513979] [<ffffffffb776e27f>] ip_finish_output+0x19f/0x330 [ 112.514627] [<ffffffffb776f533>] ip_output+0x83/0x270 [ 112.515204] [<ffffffffb776f55b>] ? ip_output+0xab/0x270 [ 112.515794] [<ffffffffb776e0e0>] ? ip_fragment.constprop.51+0x80/0x80 [ 112.516521] [<ffffffffb776e699>] ip_local_out+0x39/0x70 [ 112.517107] [<ffffffffb7770069>] ip_send_skb+0x19/0x40 [ 112.517689] [<ffffffffb779dd22>] udp_send_skb+0x172/0x260 [ 112.518299] [<ffffffffb779f4b0>] udp_sendmsg+0x340/0xb30 [ 112.518893] [<ffffffffb779de70>] ? udp_push_pending_frames+0x60/0x60 [ 112.519605] [<ffffffffb77aeff8>] inet_sendmsg+0xf8/0x1c0 [ 112.520197] [<ffffffffb77aef05>] ? inet_sendmsg+0x5/0x1c0 [ 112.520807] [<ffffffffb76f4b98>] sock_sendmsg+0x38/0x50 [ 112.521397] [<ffffffffb76f51b1>] SYSC_sendto+0x101/0x190 [ 112.521993] [<ffffffffb70efc0f>] ? up_read+0x1f/0x40 [ 112.522563] [<ffffffffb7054dfd>] ? __do_page_fault+0x26d/0x4f0 [ 112.523221] [<ffffffffb70f3f55>] ? trace_hardirqs_on_caller+0xf5/0x1b0 [ 112.523950] [<ffffffffb700201a>] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 112.524664] [<ffffffffb76f60fe>] SyS_sendto+0xe/0x10 [ 112.525230] [<ffffffffb7870e01>] entry_SYSCALL_64_fastpath+0x1f/0xc2 [ 112.525939] Code: 48 89 e5 41 57 41 56 41 55 41 54 4c 63 ea 53 49 89 fc 41 89 f7 4c 89 e8 48 83 ec 08 4c 8b 77 28 44 89 6d d4 49 8b 96 d0 00 00 00 <f0> 48 0f c1 02 49 8d 5c 05 00 e9 41 00 00 00 49 8b 44 24 28 48 [ 112.528965] RIP [<ffffffffb76f8031>] __sk_mem_raise_allocated+0x31/0x3f0 [ 112.529732] RSP <ffff928abfd03b18> [ 112.530122] CR2: 0000000000000000 [ 112.530504] ---[ end trace ed0c680ae4317de5 ]--- [ 112.531019] Kernel panic - not syncing: Fatal exception in interrupt [ 112.550850] Kernel Offset: 0x36000000 from 0xffffffff81000000 (relocation rang
