From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 60518] Heavy network traffic between guest and host triggers
kernel oops
Date: Tue, 06 Aug 2013 08:55:31 +0000
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https://bugzilla.kernel.org/show_bug.cgi?id=3D60518
Tim K=C3=A4ck changed:
What |Removed |Added
-----------------------------------------------------------------------=
-----
CC| |timkack@gmail.com
--- Comment #3 from Tim K=C3=A4ck ---
This does unfortunately still happens in 3.10
Linux ArchSTAR 3.10.3-1-ARCH #1 SMP PREEMPT Fri Jul 26 11:26:59 CEST 20=
13
x86_64 GNU/Linux
Relevant oops trace:
BUG: unable to handle kernel NULL pointer dereference at (nul=
l)
IP: [] put_page+0x5/0x40
PGD 0=20
Oops: 0000 [#1] PREEMPT SMP=20
Modules linked in: vhost_net macvtap macvlan fuse joydev hid_apple hid=
p
ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf
snd_timer pci_hotplug parport ptp pps_core libphy lpc_ich snd i5k_amb
soundcore button processor pci_stub vboxpci(O) vboxnetflt(O) vbo..._mod=
mptbase
CPU: 3 PID: 4234 Comm: vhost-4233 Tainted: P O 3.10.3-1-ARCH=
#1
Hardware name: Dell Inc. Precision WorkStation T7400 /0RW199, BIOS A0=
4
08/21/2008
task: ffff880427672a30 ti: ffff8803b9a22000 task.ti: ffff8803b9a22000
RIP: 0010:[] [] put_page+0x5/0x40
RSP: 0018:ffff8803b9a23c70 EFLAGS: 00010202
RAX: 0000000000000140 RBX: ffff8803996b3ec0 RCX: 0000000000000000
RDX: ffff8803b9a23fd8 RSI: ffff8803996b3ec0 RDI: 0000000000000000
RBP: ffff8803b9a23c90 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000012
R13: ffff8803a7a38700 R14: 000000000000000c R15: ffff8803a7a38700
FS: 0000000000000000(0000) GS:ffff88043fcc0000(0000) knlGS:0000000000=
000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000000 CR3: 000000034a32f000 CR4: 00000000000427e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Stack:
ffffffff813b8f38 ffff8803a7a38700 ffff8803a7a38700 ffffffffa005f1b4
ffff8803b9a23ca8 ffffffff813b8fe4 ffff8803be588800 ffff8803b9a23cd0
ffffffff813b9046 ffff8803be588800 000000000000b38a 000000000000b396
Call Trace:
[] ? skb_release_data+0x88/0x110
[] ? tun_get_user+0x724/0x800 [tun]
[] skb_release_all+0x24/0x30
[] kfree_skb+0x36/0xe0
[] tun_get_user+0x724/0x800 [tun]
[] tun_sendmsg+0x54/0x80 [tun]
[] handle_tx+0x180/0x560 [vhost_net]
[] handle_tx_kick+0x15/0x20 [vhost_net]
[] vhost_worker+0xf7/0x1a0 [vhost_net]
[] ? vhost_work_flush+0x100/0x100 [vhost_net]
[] kthread+0xc0/0xd0
[] ? kthread_create_on_node+0x120/0x120
[] ret_from_fork+0x7c/0xb0
[] ? kthread_create_on_node+0x120/0x120
Code: d0 f3 90 49 8b 0c 24 f7 c1 00 00 00 01 75 f2 83 80 44 e0 ff ff 0=
1 e9 f1
fe ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 66 66 66 66 90 ...0f 94 c0 84=
=20
RIP [] put_page+0x5/0x40
RSP
CR2: 0000000000000000
---[ end trace df427221626605d8 ]---
Reproduction steps (almost 100% of the time):=20
1) set guest A to be NFS server
2) create deep folder structure with lots of tiny files and share it /s=
hare
3) mount on guest B and on host
4) Copy 2 Gb file from Guest B to /share
5) At the same time do "find /share -print > /dev/null' on host
--=20
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