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Date:	Mon, 25 Aug 2014 21:48:31 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Sitsofe Wheeler <sitsofe@...il.com>,
	Dan Carpenter <dan.carpenter@...cle.com>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jason Wang <jasowang@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Daniel Borkmann <dborkman@...hat.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	Haiyang Zhang <haiyangz@...rosoft.com>
Subject: RE: [hyperv] BUG at drivers/hv/channel.c:462 while changing MTU



> -----Original Message-----
> From: Sitsofe Wheeler [mailto:sitsofe@...il.com]
> Sent: Monday, August 25, 2014 2:43 PM
> To: Dan Carpenter
> Cc: KY Srinivasan; Greg Kroah-Hartman; Jason Wang; linux-
> kernel@...r.kernel.org; David S. Miller; Daniel Borkmann;
> netdev@...r.kernel.org; devel@...uxdriverproject.org; Haiyang Zhang
> Subject: Re: [hyperv] BUG at drivers/hv/channel.c:462 while changing MTU
> 
> On Mon, Aug 25, 2014 at 12:36:48PM +0300, Dan Carpenter wrote:
> > The code here is:
> >
> > drivers/hv/channel.c
> >    460          BUG_ON(ret != 0);
> >    461          t = wait_for_completion_timeout(&info->waitevent, 5*HZ);
> >    462          BUG_ON(t == 0);
> >
> 
> There is also a case of the BUG_ON at line 460 being hit (from
> https://lkml.org/lkml/2014/8/19/708 ):
> 
> 457        ret = vmbus_post_msg(msg,
> 458                                       sizeof(struct vmbus_channel_gpadl_teardown));
> 459
> 460        BUG_ON(ret != 0);
> 
> Aug 20 03:42:58 ubuntuhv kernel: [   13.028182] input: TPPS/2 IBM TrackPoint
> as /devices/platform/i8042/serio1/input/input4
> Aug 20 03:41:09 ubuntuhv kernel: [  179.973064] hv_netvsc vmbus_0_14: net
> device safe to remove Aug 20 03:41:09 ubuntuhv kernel: [  179.974995]
> hv_netvsc: hv_netvsc channel opened successfully Aug 20 03:41:10 ubuntuhv
> kernel: [  180.402957] hv_netvsc vmbus_0_14 eth0: unable to establish send
> buffer's gpadl Aug 20 03:41:10 ubuntuhv kernel: [  180.403080] ------------[ cut
> here ]------------ Aug 20 03:41:10 ubuntuhv kernel: [  180.403141] kernel BUG
> at drivers/hv/channel.c:460!
> Aug 20 03:41:10 ubuntuhv kernel: [  180.403253] invalid opcode: 0000 [#1]
> SMP Aug 20 03:41:10 ubuntuhv kernel: [  180.403328] CPU: 1 PID: 1482 Comm:
> ifconfig Not tainted 3.17.0-rc1.x86_64 #1 Aug 20 03:41:10 ubuntuhv kernel: [
> 180.403431] Hardware name: Microsoft Corporation Virtual Machine/Virtual
> Machine, BIOS 090006  05/23/2012 Aug 20 03:41:10 ubuntuhv kernel: [
> 180.403536] task: ffff88006e45b9f0 ti: ffff880070b20000 task.ti:
> ffff880070b20000 Aug 20 03:41:10 ubuntuhv kernel: [  180.403536] RIP:
> 0010:[<ffffffff815a9901>]  [<ffffffff815a9901>]
> vmbus_teardown_gpadl+0xc1/0x130 Aug 20 03:41:10 ubuntuhv kernel: [
> 180.403536] RSP: 0018:ffff880070b23c00  EFLAGS: 00010202 Aug 20 03:41:10
> ubuntuhv kernel: [  180.403536] RAX: 0000000000000004 RBX:
> ffff88006fef0e38 RCX: 0000000000000006 Aug 20 03:41:10 ubuntuhv kernel: [
> 180.403536] RDX: 0000000000000006 RSI: ffff88006e45c130 RDI:
> 0000000000000246 Aug 20 03:41:10 ubuntuhv kernel: [  180.403536] RBP:
> ffff880070b23c20 R08: 0000000000000000 R09: 0000000000000000 Aug 20
> 03:41:10 ubuntuhv kernel: [  180.403536] R10: 0000000000000001 R11:
> 0000000000000001 R12: 0000000000000296 Aug 20 03:41:10 ubuntuhv kernel: [
> 180.403536] R13: ffff88007b911520 R14: ffff88006fef0e58 R15:
> 0000000000000004 Aug 20 03:41:10 ubuntuhv kernel: [  180.403536] FS:
> 00007fe5cd41d740(0000) GS:ffff88007fc20000(0000) knlGS:0000000000000000
> Aug 20 03:41:10 ubuntuhv kernel: [  180.403536] CS:  0010 DS: 0000 ES: 0000
> CR0: 0000000080050033 Aug 20 03:41:10 ubuntuhv kernel: [  180.403536] CR2:
> 00007f4e3766d410 CR3: 0000000074bcb000 CR4: 00000000000406e0 Aug 20
> 03:41:10 ubuntuhv kernel: [  180.403536] Stack:
> Aug 20 03:41:10 ubuntuhv kernel: [  180.403536]  ffff880074550000
> 0000000000000000 ffff880078154520 ffff880074550000 Aug 20 03:41:10
> ubuntuhv kernel: [  180.403536]  ffff880070b23c48 ffffffff814e8276
> ffff88007b916458 ffff880078154520 Aug 20 03:41:10 ubuntuhv kernel: [
> 180.403536]  ffff880074550000 ffff880070b23cb8 ffffffff814e957f
> ffff88007b911520 Aug 20 03:41:10 ubuntuhv kernel: [  180.403536] Call Trace:
> Aug 20 03:41:10 ubuntuhv kernel: [  180.403536]  [<ffffffff814e8276>]
> netvsc_destroy_buf+0xb6/0x210 Aug 20 03:41:10 ubuntuhv kernel: [
> 180.403536]  [<ffffffff814e957f>] netvsc_device_add+0x6ef/0x7c0 Aug 20
> 03:41:10 ubuntuhv kernel: [  180.403536]  [<ffffffff814ea6e0>]
> rndis_filter_device_add+0x80/0x430
> Aug 20 03:41:10 ubuntuhv kernel: [  180.403536]  [<ffffffff810b16c0>] ?
> __wake_up_common+0x90/0x90 Aug 20 03:41:10 ubuntuhv kernel: [
> 180.403536]  [<ffffffff814e6dfc>] netvsc_change_mtu+0x15c/0x1f0 Aug 20
> 03:41:10 ubuntuhv kernel: [  180.403536]  [<ffffffff815d19d0>]
> dev_set_mtu+0x80/0x130 Aug 20 03:41:10 ubuntuhv kernel: [  180.403536]
> [<ffffffff815e67b4>] dev_ifsioc+0x124/0x390 Aug 20 03:41:10 ubuntuhv
> kernel: [  180.403536]  [<ffffffff815e7006>] dev_ioctl+0x516/0x5e0 Aug 20
> 03:41:10 ubuntuhv kernel: [  180.403536]  [<ffffffff815b339d>]
> sock_ioctl+0x1fd/0x210 Aug 20 03:41:10 ubuntuhv kernel: [  180.403536]
> [<ffffffff811d54b0>] do_vfs_ioctl+0x4d0/0x510 Aug 20 03:41:10 ubuntuhv
> kernel: [  180.403536]  [<ffffffff8132aa9e>] ? file_has_perm+0x7e/0x90 Aug
> 20 03:41:10 ubuntuhv kernel: [  180.403536]  [<ffffffff811d5543>]
> SyS_ioctl+0x53/0x90 Aug 20 03:41:10 ubuntuhv kernel: [  180.403536]
> [<ffffffff816a38e9>] system_call_fastpath+0x16/0x1b Aug 20 03:41:10
> ubuntuhv kernel: [  180.403536] Code: 89 df e8 c3 ba df ff 4c 89 e6 48 c7 c7 40
> 27 ce 81 e8 24 93 0f 00 48 8d bb 88 00 00 00 be 10 00 00 00 e8 13 f2 ff ff 85 c0 74
> 07 <0f> 0b 0f 1f 44 00 00 be 88 13 00 00 4c 89 f7 e8 5b 4d 0f 00 85 Aug 20
> 03:41:10 ubuntuhv kernel: [  180.403536] RIP  [<ffffffff815a9901>]
> vmbus_teardown_gpadl+0xc1/0x130 Aug 20 03:41:10 ubuntuhv kernel: [
> 180.403536]  RSP <ffff880070b23c00> Aug 20 03:41:10 ubuntuhv kernel: [
> 180.405770] ---[ end trace 9ec56592fdff213b ]---

I will take care of all BUG_ON() instances in channel.c

Regards,

K. Y
> 
> --
> Sitsofe | http://sucs.org/~sits/
--
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