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Date: Tue, 3 May 2016 16:37:47 -0300
From: Fabio Estevam <festevam@...il.com>
To: Chuck Lever <chuck.lever@...cle.com>
Cc: Trond Myklebust <trond.myklebust@...marydata.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
Linux NFS Mailing List <linux-nfs@...r.kernel.org>
Subject: Re: Cannot use NFS with linux-next 20160429
Hi Chuck,
On Sun, May 1, 2016 at 4:52 PM, Chuck Lever <chuck.lever@...cle.com> wrote:
> Hi Fabio-
>
>> On Apr 29, 2016, at 7:18 PM, Fabio Estevam <festevam@...il.com> wrote:
>>
>> Hi,
>>
>> NFS is not working on a imx6q-sabresd board running linux-next 20160429:
>>
>> [ 15.753317] #0: wm8962-audio
>> [ 15.759437] Root-NFS: no NFS server address
>
> At a glance, that looks like the NFSROOT mount options are
> invalid? First, confirm what is specified on the kernel
> cmdline.
Yes, the kernel command line is correct.
>
> I'm not aware of any recent changes to NFSROOT. Often
> these NFSROOT problems turn out to be related to churn in
> the underlying Ethernet drivers or the generic code that
> handles mounting the root filesystem at boot time.
Today's next shows some different info:
[ 7.606456] #0: wm8962-audio
[ 7.672659] VFS: Mounted root (nfs filesystem) readonly on device 0:14.
[ 7.680860] devtmpfs: mounted
[ 7.685664] Freeing unused kernel memory: 1024K (c0c00000 - c0d00000)
[ 7.871481]
[ 7.873004] =================================
[ 7.877381] [ INFO: inconsistent lock state ]
[ 7.881760] 4.6.0-rc6-next-20160503-00002-g51d9962 #351 Not tainted
[ 7.888043] ---------------------------------
[ 7.892419] inconsistent {IN-SOFTIRQ-W} -> {SOFTIRQ-ON-W} usage.
[ 7.898449] kworker/0:1H/179 [HC0[0]:SC0[0]:HE1:SE1] takes:
[ 7.904040] (&syncp->seq#5){+.?...}, at: [<c0752328>] tcp_ack+0x134/0x129c
[ 7.911166] {IN-SOFTIRQ-W} state was registered at:
[ 7.916061] [<c016cc68>] lock_acquire+0x78/0x98
[ 7.920816] [<c074ccbc>] tcp_snd_una_update+0x64/0xa8
[ 7.926092] [<c0752328>] tcp_ack+0x134/0x129c
[ 7.930668] [<c0755de8>] tcp_rcv_state_process+0x814/0xfc8
[ 7.936375] [<c075e800>] tcp_v4_do_rcv+0x64/0x1c8
[ 7.941305] [<c07616c8>] tcp_v4_rcv+0xf00/0xfbc
[ 7.946057] [<c07374cc>] ip_local_deliver_finish+0xd4/0x550
[ 7.951859] [<c0737bc4>] ip_local_deliver+0xcc/0xdc
[ 7.956957] [<c0736d78>] ip_rcv_finish+0xc4/0x744
[ 7.961881] [<c073809c>] ip_rcv+0x4c8/0x7a8
[ 7.966284] [<c06fa448>] __netif_receive_skb_core+0x514/0x8ec
[ 7.972251] [<c06ff854>] __netif_receive_skb+0x2c/0x8c
[ 7.977614] [<c06ffb50>] netif_receive_skb_internal+0x7c/0x1f0
[ 7.983666] [<c0700e38>] napi_gro_receive+0x88/0xdc
[ 7.988764] [<c058fb4c>] fec_enet_rx_napi+0x390/0x9c8
[ 7.994036] [<c0700724>] net_rx_action+0x148/0x344
[ 7.999046] [<c012996c>] __do_softirq+0x130/0x2bc
[ 8.003976] [<c0129e40>] irq_exit+0xc4/0x138
[ 8.008466] [<c0177920>] __handle_domain_irq+0x74/0xe4
[ 8.013838] [<c01015d8>] gic_handle_irq+0x4c/0x9c
[ 8.018763] [<c010c4b8>] __irq_svc+0x58/0x78
[ 8.023251] [<c08f7db8>] _raw_spin_unlock_irq+0x30/0x34
[ 8.028710] [<c014a03c>] finish_task_switch+0xcc/0x274
[ 8.034072] [<c08f2728>] __schedule+0x23c/0x6f8
[ 8.038823] [<c08f2d0c>] schedule+0x3c/0xa0
[ 8.043224] [<c08f2f74>] schedule_preempt_disabled+0x10/0x14
[ 8.049103] [<c01663b0>] cpu_startup_entry+0x1f4/0x24c
[ 8.054468] [<c08f070c>] rest_init+0x12c/0x16c
[ 8.059130] [<c0c00cbc>] start_kernel+0x340/0x3b0
[ 8.064059] [<1000807c>] 0x1000807c
[ 8.067767] irq event stamp: 3601
[ 8.071099] hardirqs last enabled at (3601): [<c08f7d74>]
_raw_spin_unlock_irqrestore+0x38/0x4c
[ 8.079936] hardirqs last disabled at (3600): [<c08f7728>]
_raw_spin_lock_irqsave+0x24/0x54
[ 8.088336] softirqs last enabled at (3598): [<c06e9754>]
__release_sock+0x3c/0x124
[ 8.096128] softirqs last disabled at (3596): [<c06e985c>]
release_sock+0x20/0xa4
[ 8.103654]
[ 8.103654] other info that might help us debug this:
[ 8.110202] Possible unsafe locking scenario:
[ 8.110202]
[ 8.116140] CPU0
[ 8.118601] ----
[ 8.121062] lock(&syncp->seq#5);
[ 8.124547] <Interrupt>
[ 8.127182] lock(&syncp->seq#5);
[ 8.130838]
[ 8.130838] *** DEADLOCK ***
[ 8.130838]
[ 8.136785] 3 locks held by kworker/0:1H/179:
[ 8.141157] #0: ("rpciod"){.+.+.+}, at: [<c013e478>]
process_one_work+0x128/0x410
[ 8.148965] #1: ((&task->u.tk_work)){+.+.+.}, at: [<c013e478>]
process_one_work+0x128/0x410
[ 8.157630] #2: (sk_lock-AF_INET-RPC){+.+...}, at: [<c074af70>]
tcp_sendmsg+0x24/0xb5c
[ 8.165859]
[ 8.165859] stack backtrace:
[ 8.170247] CPU: 0 PID: 179 Comm: kworker/0:1H Not tainted
4.6.0-rc6-next-20160503-00002-g51d9962 #351
[ 8.179572] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
[ 8.186137] Workqueue: rpciod rpc_async_schedule
[ 8.190791] Backtrace:
[ 8.193307] [<c010b6f8>] (dump_backtrace) from [<c010b894>]
(show_stack+0x18/0x1c)
[ 8.200894] r6:60000193 r5:ffffffff r4:00000000 r3:eebdc800
[ 8.206692] [<c010b87c>] (show_stack) from [<c03dfbf4>]
(dump_stack+0xb0/0xe8)
[ 8.213961] [<c03dfb44>] (dump_stack) from [<c01c72d4>]
(print_usage_bug+0x268/0x2dc)
[ 8.221809] r8:00000004 r7:eebdcd00 r6:eebdc800 r5:c0ae4bbc
r4:c0ec6054 r3:eebdc800
[ 8.229712] [<c01c706c>] (print_usage_bug) from [<c016ace0>]
(mark_lock+0x29c/0x6b0)
[ 8.237472] r10:c016a1c8 r8:00000004 r7:eebdc800 r6:00001054
r5:eebdcd00 r4:00000006
[ 8.245456] [<c016aa44>] (mark_lock) from [<c016b644>]
(__lock_acquire+0x550/0x17c8)
[ 8.253216] r10:c0d21d9c r9:000002be r8:c0e97784 r7:eebdc800
r6:c153a09c r5:eebdcd00
[ 8.261188] r4:00000003 r3:00000001
[ 8.264837] [<c016b0f4>] (__lock_acquire) from [<c016cc68>]
(lock_acquire+0x78/0x98)
[ 8.272598] r10:00000001 r9:c0752328 r8:2d738f6b r7:00000001
r6:c0752328 r5:60000113
[ 8.280568] r4:00000000
[ 8.283155] [<c016cbf0>] (lock_acquire) from [<c074ccbc>]
(tcp_snd_una_update+0x64/0xa8)
[ 8.291261] r7:00000000 r6:ee6b9500 r5:ee6b9500 r4:ee6b99cc
[ 8.297050] [<c074cc58>] (tcp_snd_una_update) from [<c0752328>]
(tcp_ack+0x134/0x129c)
[ 8.304984] r10:ee6b9570 r9:ee42f9c0 r8:2d738f6b r7:c0d02100
r6:00000002 r5:ee6b9500
[ 8.312956] r4:00000002
[ 8.315542] [<c07521f4>] (tcp_ack) from [<c0754c08>]
(tcp_rcv_established+0x140/0x774)
[ 8.323477] r10:ee6b9570 r9:ee42f9c0 r8:c0d6bfb3 r7:c155a080
r6:ee6e9a62 r5:ee42f9c0
[ 8.331448] r4:ee6b9500
[ 8.334039] [<c0754ac8>] (tcp_rcv_established) from [<c075e8fc>]
(tcp_v4_do_rcv+0x160/0x1c8)
[ 8.342494] r8:c0d6bfb3 r7:c155a080 r6:eea79600 r5:ee6b9500 r4:ee42f9c0
[ 8.349348] [<c075e79c>] (tcp_v4_do_rcv) from [<c06e97ac>]
(__release_sock+0x94/0x124)
[ 8.357281] r6:00000000 r5:ee6b9500 r4:00000000 r3:c075e79c
[ 8.363065] [<c06e9718>] (__release_sock) from [<c06e9870>]
(release_sock+0x34/0xa4)
[ 8.370825] r10:ee6b9500 r9:ee6c1ce4 r8:00000000 r7:00000080
r6:c074b1f0 r5:ee6b9570
[ 8.378797] r4:ee6b9500 r3:ee42f9c0
[ 8.382448] [<c06e983c>] (release_sock) from [<c074b1f0>]
(tcp_sendmsg+0x2a4/0xb5c)
[ 8.390122] r6:00000080 r5:ee6b9500 r4:ee6c2000 r3:00000015
[ 8.395922] [<c074af4c>] (tcp_sendmsg) from [<c077a824>]
(inet_sendmsg+0x128/0x200)
[ 8.403596] r10:c0d6c136 r9:ee6a4000 r8:ee6c1ce4 r7:00000080
r6:00000000 r5:c0d6c136
[ 8.411565] r4:ee6b9500
[ 8.414161] [<c077a6fc>] (inet_sendmsg) from [<c06e41ec>]
(sock_sendmsg+0x1c/0x2c)
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