netdev - NFS does not work on linux-next 20140331

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Date:	Mon, 31 Mar 2014 13:14:56 -0300
From:	Fabio Estevam <festevam@...il.com>
To:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Cc:	"David S. Miller" <davem@...emloft.net>
Subject: NFS does not work on linux-next 20140331

Hi,

When running linux-next 20140331 I am no longer able to mount NFS on a
mx6qsabresd board:

=================================
[ INFO: inconsistent lock state ]
3.14.0-rc8-next-20140331 #964 Not tainted
---------------------------------
inconsistent {IN-SOFTIRQ-W} -> {SOFTIRQ-ON-W} usage.
kworker/0:2/50 [HC0[0]:SC0[0]:HE1:SE1] takes:
 (&addrconf_stats->syncp.seq){+.?...}, at: [<8057ca88>] mld_send_initial_cr.par0
{IN-SOFTIRQ-W} state was registered at:
  [<8006366c>] mark_lock+0x140/0x6ac
  [<80063ebc>] __lock_acquire+0x2e4/0x1c00
  [<80065cbc>] lock_acquire+0x68/0x7c
  [<8057bf28>] mld_sendpack+0xec/0x73c
  [<8057cc80>] mld_ifc_timer_expire+0x1e4/0x2e4
  [<8003310c>] call_timer_fn+0x74/0xec
  [<80033a5c>] run_timer_softirq+0x1c4/0x264
  [<8002d3d4>] __do_softirq+0x130/0x278
  [<8002d814>] irq_exit+0xb0/0x104
  [<8000f47c>] handle_IRQ+0x58/0xb8
  [<80008680>] gic_handle_irq+0x30/0x64
  [<800129a4>] __irq_svc+0x44/0x5c
  [<8005f9dc>] cpu_startup_entry+0xfc/0x160
  [<80617a3c>] rest_init+0xb0/0xd8
  [<8083db58>] start_kernel+0x324/0x388
  [<10008074>] 0x10008074
irq event stamp: 62347
hardirqs last  enabled at (62347): [<8002d67c>] __local_bh_enable_ip+0x80/0xe8
hardirqs last disabled at (62345): [<8002d63c>] __local_bh_enable_ip+0x40/0xe8
softirqs last  enabled at (62346): [<80558740>] ip6_finish_output2+0x16c/0x9d8
softirqs last disabled at (62334): [<80558624>] ip6_finish_output2+0x50/0x9d8

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&addrconf_stats->syncp.seq);
  <Interrupt>
    lock(&addrconf_stats->syncp.seq);

 *** DEADLOCK ***

4 locks held by kworker/0:2/50:
 #0:  ("%s"("ipv6_addrconf")){.+.+..}, at: [<8003f2d0>] process_one_work+0x134/4
 #1:  ((&(&ifa->dad_work)->work)){+.+...}, at: [<8003f2d0>] process_one_work+0x4
 #2:  (rtnl_mutex){+.+.+.}, at: [<804e0acc>] rtnl_lock+0x18/0x20
 #3:  (rcu_read_lock){......}, at: [<8057be3c>] mld_sendpack+0x0/0x73c

stack backtrace:
CPU: 0 PID: 50 Comm: kworker/0:2 Not tainted 3.14.0-rc8-next-20140331 #964
Workqueue: ipv6_addrconf addrconf_dad_work
Backtrace:
[<80011cd4>] (dump_backtrace) from [<80011e70>] (show_stack+0x18/0x1c)
 r6:be81c440 r5:00000000 r4:00000000 r3:be81c440
[<80011e58>] (show_stack) from [<8061e054>] (dump_stack+0x88/0xa4)
[<8061dfcc>] (dump_stack) from [<8061bcf8>] (print_usage_bug+0x260/0x2d0)
 r5:80784b0c r4:809aee20
[<8061ba98>] (print_usage_bug) from [<800637c8>] (mark_lock+0x29c/0x6ac)
 r10:80062cc0 r8:00000004 r7:be81c440 r6:00001054 r5:be81c8e8 r4:00000006
[<8006352c>] (mark_lock) from [<80064200>] (__lock_acquire+0x628/0x1c00)
 r10:bf7b755c r9:be82e000 r8:000001ef r7:8098e030 r6:808b3afc r5:be81c440
 r4:80dde8cc r3:00000004
[<80063bd8>] (__lock_acquire) from [<80065cbc>] (lock_acquire+0x68/0x7c)
 r10:808e4e00 r9:00000001 r8:80896d2c r7:00000001 r6:60000013 r5:be82e000
 r4:00000000
[<80065c54>] (lock_acquire) from [<8057c248>] (mld_sendpack+0x40c/0x73c)
 r7:00000000 r6:8057ca88 r5:0000004c r4:bf7b7438
[<8057be3c>] (mld_sendpack) from [<8057ca88>] (mld_send_initial_cr.part.18+0x9c)
 r10:be9d48d0 r9:00000001 r8:00000000 r7:00000001 r6:beb880c0 r5:bebe4668
 r4:00000000
[<8057c9ec>] (mld_send_initial_cr.part.18) from [<8057ffb0>] (ipv6_mc_dad_compl)
 r10:00000000 r8:be9d48d0 r7:be9d2a00 r6:be9d2a20 r5:be8c8000 r4:be9d4800
[<8057ff7c>] (ipv6_mc_dad_complete) from [<805641b8>] (addrconf_dad_completed+0)
 r4:be9d2a00 r3:be81c440
[<805640bc>] (addrconf_dad_completed) from [<8056445c>] (addrconf_dad_work+0x1f)
 r5:be9d2a40 r4:be9d2a74
[<80564260>] (addrconf_dad_work) from [<8003f344>] (process_one_work+0x1a8/0x44)
 r10:bf7b7200 r8:00000000 r7:be82e000 r6:bf7b15c0 r5:be9d2a74 r4:be801c80
[<8003f19c>] (process_one_work) from [<8003f9e4>] (worker_thread+0x124/0x398)
 r10:808eddf6 r9:bf7b15c0 r8:be82e000 r7:be801c98 r6:be82e000 r5:bf7b15f0
 r4:be801c80
[<8003f8c0>] (worker_thread) from [<8004669c>] (kthread+0xd0/0xec)
 r10:00000000 r9:00000000 r8:00000000 r7:8003f8c0 r6:be801c80 r5:be808a40
 r4:00000000
[<800465cc>] (kthread) from [<8000ebe8>] (ret_from_fork+0x14/0x2c)
 r7:00000000 r6:00000000 r5:800465cc r4:be808a40
INFO: rcu_sched detected stalls on CPUs/tasks: {} (detected by 1, t=2102 jiffie)
INFO: Stall ended before state dump start
random: nonblocking pool is initialized
INFO: rcu_sched detected stalls on CPUs/tasks: {} (detected by 0, t=8407 jiffie)
INFO: Stall ended before state dump start
INFO: rcu_sched detected stalls on CPUs/tasks: {} (detected by 3, t=14712 jiffi)
INFO: Stall ended before state dump start
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