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Date: Fri, 29 Mar 2013 14:40:06 -0400
From: Dave Jones <davej@...hat.com>
To: netdev@...r.kernel.org
Subject: oops in udpv6_sendmsg
Just hit this on Linus' current tree.
BUG: unable to handle kernel NULL pointer dereference at 0000000000000031
IP: [<ffffffff8166ca6b>] udpv6_sendmsg+0x34b/0xa90
PGD 67f4e067 PUD 60281067 PMD 0
Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
Modules linked in: dlci 8021q garp mrp fuse vmw_vsock_vmci_transport vmw_vmci vsock bnep hidp bridge stp rfcomm l2tp_ppp l2tp_netlink l2tp_core phonet af_key af_rxrpc caif_socket caif rose llc2 netrom can_raw cmtp kernelcapi nfnetlink ipt_ULOG can_bcm can af_802154 scsi_transport_iscsi pppoe ipx atm ax25 p8023 p8022 nfc pppox decnet irda ppp_generic x25 slhc rds crc_ccitt appletalk psnap llc lockd sunrpc ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_conntrack nf_conntrack ip6table_filter ip6_tables snd_hda_codec_realtek raid0 snd_hda_intel snd_hda_codec snd_pcm btusb microcode snd_page_alloc serio_raw snd_timer bluetooth pcspkr snd edac_core rfkill soundcore r8169 mii vhost_net tun macvtap macvlan kvm_amd kvm radeon backlight drm_kms_helper ttm
CPU 0
Pid: 22781, comm: trinity-child33 Not tainted 3.9.0-rc4+ #7 Gigabyte Technology Co., Ltd. GA-MA78GM-S2H/GA-MA78GM-S2H
RIP: 0010:[<ffffffff8166ca6b>] [<ffffffff8166ca6b>] udpv6_sendmsg+0x34b/0xa90
RSP: 0018:ffff880011811a70 EFLAGS: 00010206
RAX: 0000000000000005 RBX: ffff8800167a7000 RCX: ffff8800167a7618
RDX: ffff8800167a7248 RSI: ffff88011959d680 RDI: ffff88011959d680
RBP: ffff880011811ba0 R08: ffff8800167a75f8 R09: 0000000000000001
R10: ffff8800603f2490 R11: 0000000000000002 R12: 00000000ffffffe0
R13: ffff8800167a75f8 R14: ffff88011959d680 R15: ffff8800167a75f8
FS: 00007f655b275740(0000) GS:ffff88012a600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000031 CR3: 000000008e94a000 CR4: 00000000000007f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process trinity-child33 (pid: 22781, threadinfo ffff880011810000, task ffff8800603f2490)
Stack:
ffff880000000000 0000000000000000 ffff880011811b28 ffff88011959d680
00000000200065c0 ffffffff00000000 ffff8800167a7600 ffff8800167a75f8
0000000011811ac0 0000000000000000 ffff8800167a7618 ffff8800167a7248
Call Trace:
[<ffffffff8100a144>] ? native_sched_clock+0x24/0x80
[<ffffffff810b3348>] ? trace_hardirqs_off_caller+0x28/0xc0
[<ffffffff816076ac>] inet_sendmsg+0x10c/0x220
[<ffffffff816075a5>] ? inet_sendmsg+0x5/0x220
[<ffffffff81567b37>] sock_sendmsg+0xb7/0xe0
[<ffffffff8100a144>] ? native_sched_clock+0x24/0x80
[<ffffffff810b3462>] ? get_lock_stats+0x22/0x70
[<ffffffff810b3b8e>] ? put_lock_stats.isra.27+0xe/0x40
[<ffffffff810b418c>] ? lock_release_holdtime.part.28+0x9c/0x150
[<ffffffff81578286>] ? verify_iovec+0x56/0xd0
[<ffffffff8156884e>] __sys_sendmsg+0x3ae/0x3c0
[<ffffffff8100a144>] ? native_sched_clock+0x24/0x80
[<ffffffff810b3462>] ? get_lock_stats+0x22/0x70
[<ffffffff810b3b8e>] ? put_lock_stats.isra.27+0xe/0x40
[<ffffffff810b41d5>] ? lock_release_holdtime.part.28+0xe5/0x150
[<ffffffff8100a144>] ? native_sched_clock+0x24/0x80
[<ffffffff810b3348>] ? trace_hardirqs_off_caller+0x28/0xc0
[<ffffffff810b3b8e>] ? put_lock_stats.isra.27+0xe/0x40
[<ffffffff816c512c>] ? _raw_spin_unlock_irq+0x2c/0x60
[<ffffffff811dbe5c>] ? fget_light+0x38c/0x500
[<ffffffff8156a989>] sys_sendmsg+0x49/0x90
[<ffffffff816cd942>] system_call_fastpath+0x16/0x1b
Code: dc 03 f0 ff 48 8b 4c 24 50 4c 8b 44 24 38 48 8b 54 24 58 49 89 4d 48 4d 89 45 50 49 8b 86 a0 00 00 00 48 85 c0 0f 84 6c 06 00 00 <8b> 40 2c 41 89 45 74 48 89 d7 e8 66 85 05 00 45 85 e4 7e 1e 41
RIP [<ffffffff8166ca6b>] udpv6_sendmsg+0x34b/0xa90
RSP <ffff880011811a70>
CR2: 0000000000000031
---[ end trace aafad9c3e4a4dfb2 ]---
All code
========
0: dc 03 faddl (%rbx)
2: f0 ff 48 8b lock decl -0x75(%rax)
6: 4c 24 50 rex.WR and $0x50,%al
9: 4c 8b 44 24 38 mov 0x38(%rsp),%r8
e: 48 8b 54 24 58 mov 0x58(%rsp),%rdx
13: 49 89 4d 48 mov %rcx,0x48(%r13)
17: 4d 89 45 50 mov %r8,0x50(%r13)
1b: 49 8b 86 a0 00 00 00 mov 0xa0(%r14),%rax
22: 48 85 c0 test %rax,%rax
25: 0f 84 6c 06 00 00 je 0x697
2b:* 8b 40 2c mov 0x2c(%rax),%eax <-- trapping instruction
2e: 41 89 45 74 mov %eax,0x74(%r13)
32: 48 89 d7 mov %rdx,%rdi
35: e8 66 85 05 00 callq 0x585a0
3a: 45 85 e4 test %r12d,%r12d
3d: 7e 1e jle 0x5d
3f: 41 rex.B
which looks like this in udpv6_sendmsg ..
np->daddr_cache = daddr;
ca3: 49 89 4d 48 mov %rcx,0x48(%r13)
#ifdef CONFIG_IPV6_SUBTREES
np->saddr_cache = saddr;
ca7: 4d 89 45 50 mov %r8,0x50(%r13)
#endif
np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
cab: 49 8b 86 a0 00 00 00 mov 0xa0(%r14),%rax
cb2: 48 85 c0 test %rax,%rax
cb5: 0f 84 6c 06 00 00 je 1327 <udpv6_sendmsg+0x9b7>
cbb: 8b 40 2c mov 0x2c(%rax),%eax
cbe: 41 89 45 74 mov %eax,0x74(%r13)
raw_spin_lock_irqsave_nested(spinlock_check(lock), flags, subclass); \
} while (0)
Looks like the last line of an inlined __ip6_dst_store() call. So line 1243 of net/ipv6/udp.c
Dave
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