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Date: Mon, 14 Nov 2016 15:24:19 -0800
From: Andrei Vagin <avagin@...il.com>
To: Linux Kernel Network Developers <netdev@...r.kernel.org>,
Paolo Abeni <pabeni@...hat.com>
Subject: linux-next: BUG: unable to handle kernel NULL pointer dereference in __sk_mem_raise_allocated()
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
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