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Message-ID: <CAHrpEqTsUjWjxY3_C4kGL_S0pgpYawgBaSip3DEnZd3CY1hn0A@mail.gmail.com>
Date: Wed, 6 Feb 2013 17:50:12 +0800
From: Frank Li <lznuaa@...il.com>
To: Jim Baxter <jim_baxter@...tor.com>
Cc: netdev@...r.kernel.org
Subject: Re: [PATCH 1/1] net: fec: fix miss init spinlock
2013/2/5 Jim Baxter <jim_baxter@...tor.com>:
> Frank Li <lznuaa <at> gmail.com> writes:
>
>>
>> 2013/2/5 Jim Baxter <jim_baxter <at> mentor.com>:
>> > Frank Li <Frank.Li <at> freescale.com> writes:
>> >
>> >>
>> >> BUG: spinlock bad magic on CPU#1, swapper/0/1
>> >> lock: 0xbfae0f8c, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0
>> >> Backtrace:
>> >> [<80011d54>] (dump_backtrace+0x0/0x10c) from [<804e7800>]
>> > (dump_stack+0x18/0x1c)
>> >> r6:bfae0000 r5:bfae0f8c r4:00000000 r3:806c1310
>> >> [<804e77e8>] (dump_stack+0x0/0x1c) from [<804e9f20>] (spin_dump+0x80/0x94)
>> >> [<804e9ea0>] (spin_dump+0x0/0x94) from [<804e9f60>] (spin_bug+0x2c/0x30)
>> >> r5:805f6f8c r4:bfae0f8c
>> >> [<804e9f34>] (spin_bug+0x0/0x30) from [<80257984>]
>> > (do_raw_spin_lock+0x170/0x1b0 )
>> >> r5:806b4950 r4:bfae0f8c
>> >> [<80257814>] (do_raw_spin_lock+0x0/0x1b0) from [<804ed15c>]
>> > (_raw_spin_lock_irqs ave+0x18/0x20)
>> >> [<804ed144>] (_raw_spin_lock_irqsave+0x0/0x20) from [<8033c694>]
>> > (fec_ptp_start_
> cyclecounter+0x3c/0x120)
>> >> r4:bfae0f8c r3:00000002
>> >> [<8033c658>] (fec_ptp_start_cyclecounter+0x0/0x120) from [<80339e08>]
>> > (fec_resta rt+0x56c/0x5f8)
>> >> r8:00000000 r7:806e6f48 r6:00000112 r5:806b4950 r4:bfae0000
>> >> [<8033989c>] (fec_restart+0x0/0x5f8) from [<8033b9e4>]
>> > (fec_probe+0x508/0xa48)
>> >>
>> >> Signed-off-by: Frank Li <Frank.Li <at> freescale.com>
>> >> ---
>> >> drivers/net/ethernet/freescale/fec.c | 1 +
>> >> 1 files changed, 1 insertions(+), 0 deletions(-)
>> >>
>> >> diff --git a/drivers/net/ethernet/freescale/fec.c
>> > b/drivers/net/ethernet/freescale/fec.c
>> >> index 69b16b9..f900ae4 100644
>> >> --- a/drivers/net/ethernet/freescale/fec.c
>> >> +++ b/drivers/net/ethernet/freescale/fec.c
>> >> @@ -1607,6 +1607,7 @@ static int fec_enet_init(struct net_device *ndev)
>> >> }
>> >>
>> >> spin_lock_init(&fep->hw_lock);
>> >> + spin_lock_init(&fep->tmreg_lock);
>> >>
>> >> fep->netdev = ndev;
>> >>
>> >
>> >
>> >
>> > I still get spinlock errors when booting with this patch as shown below:
>> >
>> >
>> > [ 9.903511] =========================================================
>> > [ 9.909959] [ INFO: possible irq lock inversion dependency detected ]
>> > [ 9.916411] 3.5.7.3-01268-g6696bd7-dirty #1 Not tainted
>> > [ 9.921643] ---------------------------------------------------------
>> > [ 9.928089] swapper/0/0 just changed the state of lock:
>> > [ 9.933320] (&(&fep->hw_lock)->rlock){-.....}, at: [<8029d154>]
>> > fec_enet_interrupt+0x74/0x600
>> > [ 9.942026] but this lock took another, HARDIRQ-unsafe lock in the past:
>> > [ 9.948731] (prepare_lock){+.+...}
>> >
>> > and interrupts could create inverse lock ordering between them.
>> >
>> > [ 9.958266]
>> > [ 9.958266] other info that might help us debug this:
>> > [ 9.964802] Possible interrupt unsafe locking scenario:
>> > [ 9.964802]
>> > [ 9.971598] CPU0 CPU1
>> > [ 9.976133] ---- ----
>> > [ 9.980668] lock(prepare_lock);
>> > [ 9.984021] local_irq_disable();
>> > [ 9.989945] lock(&(&fep->hw_lock)->rlock);
>> > [ 9.996769] lock(prepare_lock);
>> > [ 10.002637] <Interrupt>
>> > [ 10.005262] lock(&(&fep->hw_lock)->rlock);
>> > [ 10.009742]
>> > [ 10.009742] *** DEADLOCK ***
>> > [ 10.009742]
>> > [ 10.015673] no locks held by swapper/0/0.
>> > [ 10.019689]
>> > [ 10.019689] the shortest dependencies between 2nd lock and 1st lock:
>> > [ 10.027528] -> (prepare_lock){+.+...} ops: 272 {
>> > [ 10.032321] HARDIRQ-ON-W at:
>> > [ 10.035570] [<800688d8>] mark_lock+0x290/0x628
>> > [ 10.041963] [<80069320>]
> __lock_acquire+0x6b0/0x1998
>> > [ 10.048866] [<8006ac20>] lock_acquire+0x124/0x148
>> > [ 10.055506] [<803dc02c>]
> mutex_lock_nested+0x54/0x37c
>> > [ 10.062499] [<802f5d34>] clk_prepare+0x20/0x40
>> > [ 10.068882] [<803d8094>] twd_timer_setup+0x48/0x250
>> > [ 10.075696] [<803d7dcc>]
> percpu_timer_setup+0x64/0xbc
>> > [ 10.082682] [<80551864>] smp_prepare_cpus+0x4c/0x64
>> > [ 10.089504] [<8054e8dc>] kernel_init+0x5c/0x1d0
>> > [ 10.095970] [<80026970>] do_exit+0x0/0x780
>> > [ 10.102009] SOFTIRQ-ON-W at:
>> > [ 10.105258] [<800688d8>] mark_lock+0x290/0x628
>> > [ 10.111637] [<80069344>]
> __lock_acquire+0x6d4/0x1998
>> > [ 10.118537] [<8006ac20>] lock_acquire+0x124/0x148
>> > [ 10.125177] [<803dc02c>]
> mutex_lock_nested+0x54/0x37c
>> > [ 10.132164] [<802f5d34>] clk_prepare+0x20/0x40
>> > [ 10.138543] [<803d8094>] twd_timer_setup+0x48/0x250
>> > [ 10.145355] [<803d7dcc>]
> percpu_timer_setup+0x64/0xbc
>> > [ 10.152341] [<80551864>] smp_prepare_cpus+0x4c/0x64
>> > [ 10.159154] [<8054e8dc>] kernel_init+0x5c/0x1d0
>> > [ 10.165619] [<80026970>] do_exit+0x0/0x780
>> > [ 10.171652] INITIAL USE at:
>> > [ 10.174814] [<800688d8>] mark_lock+0x290/0x628
>> > [ 10.181108] [<800693a8>] __lock_acquire+0x738/0x1998
>> > [ 10.187922] [<8006ac20>] lock_acquire+0x124/0x148
>> > [ 10.194474] [<803dc02c>]
> mutex_lock_nested+0x54/0x37c
>> > [ 10.201373] [<802f60f4>] __clk_init+0x28/0x360
>> > [ 10.207664] [<802f656c>] clk_register+0x140/0x1a4
>> > [ 10.214217] [<802f677c>]
>> > clk_register_fixed_rate+0xb0/0xe0
>> > [ 10.221552] [<80554e84>]
> mx6q_clocks_init+0x2c/0x2bd4
>> > [ 10.228457] [<80557a3c>] imx6q_timer_init+0x10/0x50
>> > [ 10.235184] [<80551668>] time_init+0x28/0x38
>> > [ 10.241303] [<8054e728>] start_kernel+0x1b4/0x30c
>> > [ 10.247855] [<10008044>] 0x10008044
>> > [ 10.253192] }
>> > [ 10.254950] ... key at: [<805c2b40>] prepare_lock+0x3c/0x4c
>> > [ 10.261172] ... acquired at:
>> > [ 10.264232] [<8006a0e0>] __lock_acquire+0x1470/0x1998
>> > [ 10.269570] [<8006ac20>] lock_acquire+0x124/0x148
>> > [ 10.274560] [<803dc02c>] mutex_lock_nested+0x54/0x37c
>> > [ 10.279897] [<802f59bc>] clk_get_rate+0x20/0x40
>> > [ 10.284712] [<8029d9d8>] fec_ptp_start_cyclecounter+0x24/0x114
>> > [ 10.290832] [<8029c2b4>] fec_restart+0x4b4/0x4f8
>> > [ 10.295734] [<8029cb64>] fec_enet_adjust_link+0x78/0xdc
>> > [ 10.301244] [<802993e4>] phy_state_machine+0x438/0x4a0
>> > [ 10.306684] [<8003da60>] process_one_work+0x2e4/0x508
>> > [ 10.312027] [<8003e184>] worker_thread+0x1b4/0x2cc
>> > [ 10.317104] [<8004271c>] kthread+0x94/0xa0
>> > [ 10.321494] [<80026970>] do_exit+0x0/0x780
>> > [ 10.325877]
>> > [ 10.327374] -> (&(&fep->hw_lock)->rlock){-.....} ops: 2 {
>> > [ 10.332860] IN-HARDIRQ-W at:
>> > [ 10.336021] [<800688d8>] mark_lock+0x290/0x628
>> > [ 10.342228] [<8006928c>] __lock_acquire+0x61c/0x1998
>> > [ 10.348955] [<8006ac20>] lock_acquire+0x124/0x148
>> > [ 10.355421] [<803de31c>] _raw_spin_lock+0x40/0x50
>> > [ 10.361892] [<8029d154>]
> fec_enet_interrupt+0x74/0x600
>> > [ 10.368791] [<800812f0>]
>> > handle_irq_event_percpu+0xbc/0x2a8
>> > [ 10.376132] [<80081520>] handle_irq_event+0x44/0x64
>> > [ 10.382771] [<800842f8>]
> handle_fasteoi_irq+0xd0/0x11c
>> > [ 10.389675] [<80080be8>] generic_handle_irq+0x28/0x38
>> > [ 10.396489] [<8000e298>] handle_IRQ+0x80/0xc0
>> > [ 10.402618] [<8000850c>] gic_handle_irq+0x40/0x64
>> > [ 10.409084] [<803deec4>] __irq_svc+0x44/0x78
>> > [ 10.415118] [<8000e748>] cpu_idle+0xb0/0x110
>> > [ 10.421151] [<803cba2c>] rest_init+0xac/0xd4
>> > [ 10.427192] [<8054e830>] start_kernel+0x2bc/0x30c
>> > [ 10.433658] [<10008044>] 0x10008044
>> > [ 10.438907] INITIAL USE at:
>> > [ 10.441982] [<800688d8>] mark_lock+0x290/0x628
>> > [ 10.448102] [<800693a8>] __lock_acquire+0x738/0x1998
>> > [ 10.454742] [<8006ac20>] lock_acquire+0x124/0x148
>> > [ 10.461121] [<803de434>]
> _raw_spin_lock_irqsave+0x4c/0x60
>> > [ 10.468195] [<8029cb10>]
> fec_enet_adjust_link+0x24/0xdc
>> > [ 10.475096] [<802993e4>] phy_state_machine+0x438/0x4a0
>> > [ 10.481912] [<8003da60>] process_one_work+0x2e4/0x508
>> > [ 10.488639] [<8003e184>] worker_thread+0x1b4/0x2cc
>> > [ 10.495104] [<8004271c>] kthread+0x94/0xa0
>> > [ 10.500878] [<80026970>] do_exit+0x0/0x780
>> > [ 10.506651] }
>> > [ 10.508321] ... key at: [<80b36b74>] __key.33768+0x0/0x8
>> > [ 10.514191] ... acquired at:
>> > [ 10.517164] [<80067a1c>] print_irq_inversion_bug+0x184/0x1e8
>> > [ 10.523110] [<80067b5c>] check_usage_forwards+0xdc/0xfc
>> > [ 10.528621] [<800689c4>] mark_lock+0x37c/0x628
>> > [ 10.533349] [<8006928c>] __lock_acquire+0x61c/0x1998
>> > [ 10.538600] [<8006ac20>] lock_acquire+0x124/0x148
>> > [ 10.543590] [<803de31c>] _raw_spin_lock+0x40/0x50
>> > [ 10.548580] [<8029d154>] fec_enet_interrupt+0x74/0x600
>> > [ 10.554005] [<800812f0>] handle_irq_event_percpu+0xbc/0x2a8
>> > [ 10.559864] [<80081520>] handle_irq_event+0x44/0x64
>> > [ 10.565027] [<800842f8>] handle_fasteoi_irq+0xd0/0x11c
>> > [ 10.570451] [<80080be8>] generic_handle_irq+0x28/0x38
>> > [ 10.575787] [<8000e298>] handle_IRQ+0x80/0xc0
>> > [ 10.580432] [<8000850c>] gic_handle_irq+0x40/0x64
>> > [ 10.585421] [<803deec4>] __irq_svc+0x44/0x78
>> > [ 10.589977] [<8000e748>] cpu_idle+0xb0/0x110
>> > [ 10.594533] [<803cba2c>] rest_init+0xac/0xd4
>> > [ 10.599091] [<8054e830>] start_kernel+0x2bc/0x30c
>> > [ 10.604080] [<10008044>] 0x10008044
>> > [ 10.607852]
>> > [ 10.609350]
>> > [ 10.609350] stack backtrace:
>> > [ 10.613715] Backtrace:
>> > [ 10.616201] [<80011a58>] (dump_backtrace+0x0/0x10c) from [<803da960>]
>> > (dump_stack+0x18/0x1c)
>> > [ 10.624645] r6:805896d8 r5:8061fbf4 r4:8057fca0 r3:805896d8
>> > [ 10.630388] [<803da948>] (dump_stack+0x0/0x1c) from [<80067a3c>]
>> > (print_irq_inversion_bug+0x1a4/0x1e8)
>> > [ 10.639711] [<80067898>] (print_irq_inversion_bug+0x0/0x1e8) from
>> > [<80067b5c>] (check_usage_forwards+0xdc/0xfc)
>> > [ 10.649815] [<80067a80>] (check_usage_forwards+0x0/0xfc) from
> [<800689c4>]
>> > (mark_lock+0x37c/0x628)
>> > [ 10.658789] [<80068648>] (mark_lock+0x0/0x628) from [<8006928c>]
>> > (__lock_acquire+0x61c/0x1998)
>> > [ 10.667416] [<80068c70>] (__lock_acquire+0x0/0x1998) from [<8006ac20>]
>> > (lock_acquire+0x124/0x148)
>> > [ 10.676304] [<8006aafc>] (lock_acquire+0x0/0x148) from [<803de31c>]
>> > (_raw_spin_lock+0x40/0x50)
>> > [ 10.684931] [<803de2dc>] (_raw_spin_lock+0x0/0x50) from [<8029d154>]
>> > (fec_enet_interrupt+0x74/0x600)
>> > [ 10.694068] r5:ac74a500 r4:ac74a000
>> > [ 10.697694] [<8029d0e0>] (fec_enet_interrupt+0x0/0x600) from [<800812f0>]
>> > (handle_irq_event_percpu+0xbc/0x2a8)
>> > [ 10.707711] [<80081234>] (handle_irq_event_percpu+0x0/0x2a8) from
>> > [<80081520>] (handle_irq_event+0x44/0x64)
>> > [ 10.717467] [<800814dc>] (handle_irq_event+0x0/0x64) from [<800842f8>]
>> > (handle_fasteoi_irq+0xd0/0x11c)
>> > [ 10.726778] r6:ffffffff r5:ac012290 r4:ac012240 r3:00000000
>> > [ 10.732522] [<80084228>] (handle_fasteoi_irq+0x0/0x11c) from [<80080be8>]
>> > (generic_handle_irq+0x28/0x38)
>> > [ 10.742008] r5:00000000 r4:00000096
>> > [ 10.745635] [<80080bc0>] (generic_handle_irq+0x0/0x38) from [<8000e298>]
>> > (handle_IRQ+0x80/0xc0)
>> > [ 10.754339] r4:00000096 r3:00000220
>> > [ 10.757964] [<8000e218>] (handle_IRQ+0x0/0xc0) from [<8000850c>]
>> > (gic_handle_irq+0x40/0x64)
>> > [ 10.766321] r5:8057ff28 r4:f4000100
>> > [ 10.769945] [<800084cc>] (gic_handle_irq+0x0/0x64) from [<803deec4>]
>> > (__irq_svc+0x44/0x78)
>> > [ 10.778216] Exception stack(0x8057ff28 to 0x8057ff70)
>> > [ 10.783279] ff20: 00000001 00000004 00000000 00000000
>> > 00000001 00000002
>> > [ 10.791469] ff40: ffffffff 80571fe4 81354b80 412fc09a 00000000 8057ff7c
>> > 8057ff40 8057ff70
>> > [ 10.799655] ff60: 8006b574 8000e514 20000013 ffffffff
>> > [ 10.804713] r5:20000013 r4:8000e514
>> > [ 10.808339] [<8000e4e4>] (default_idle+0x0/0x38) from [<8000e748>]
>> > (cpu_idle+0xb0/0x110)
>> > [ 10.816447] [<8000e698>] (cpu_idle+0x0/0x110) from [<803cba2c>]
>> > (rest_init+0xac/0xd4)
>> > [ 10.824293] [<803cb980>] (rest_init+0x0/0xd4) from [<8054e830>]
>> > (start_kernel+0x2bc/0x30c)
>> > [ 10.832562] r5:805ce340 r4:80586df0
>> > [ 10.836185] [<8054e574>] (start_kernel+0x0/0x30c) from [<10008044>]
>> > (0x10008044)
>> > INIT: version 2.86 booting
>> >
>> >
>> > Have you seen this?
>> > I am using the following configs:
>> > CONFIG_KALLSYMS_ALL=y
>> > CONFIG_DEBUG_SPINLOCK=y
>> > CONFIG_DEBUG_MUTEXES=y
>> > CONFIG_DEBUG_LOCK_ALLOC=y
>> > CONFIG_PROVE_LOCKING=y
>> > CONFIG_LOCKDEP=y
>> > # CONFIG_DEBUG_LOCKDEP is not set
>> > CONFIG_TRACE_IRQFLAGS=y
>> >
>> >
>>
>> Thank you for you tested my patch.
>> Can you try my new patch?
>>
>> > --
>> > To unsubscribe from this list: send the line "unsubscribe netdev" in
>> > the body of a message to majordomo <at> vger.kernel.org
>> > More majordomo info at http://vger.kernel.org/majordomo-info.html
>>
>
>
> Thank you, I have tried your new patch, it fixes the boot deadlock but when I
> run the ptp4l command I get another dead lock:
>
> On client running "./ptp4l -S -i eth0 -s -m"
>
>
> On the i.MX6:
>
> root@...q35:~# ptp4l -H -m -i eth0 -p /dev/ptp0
> ptp4l[98.894]: selected /dev/ptp0 as PTP clock
> ptp4l[98.896]: failed to read out the clock frequency adjustment: Operation not
> supported
> ptp4l[98.900]: driver changed our HWTSTAMP options
> ptp4l[98.900]: tx_type 1 not 1
> ptp4l[98.900]: rx_filter 1 not 12
> ptp4l[98.901]: port 1: INITIALIZING to LISTENING on INITIALIZE
> ptp4l[98.902]: port 0: INITIALIZING to LISTENING on INITIALIZE
> ptp4l[104.901]: port 1: LISTENING to MASTER on ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES
> [ 111.161885] =================================
> [ 111.166249] [ INFO: inconsistent lock state ]
> [ 111.170616] 3.5.7.3-01268-g6696bd7-dirty #2 Not tainted
> [ 111.175848] ---------------------------------
> [ 111.180213] inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage.
> [ 111.186230] ptp4l/335 [HC1[1]:SC0[0]:HE0:SE1] takes:
> [ 111.191200] (&(&list->lock)->rlock#4){?.-...}, at: [<80328590>]
> skb_queue_tail+0x20/0x50
> [ 111.199484] {HARDIRQ-ON-W} state was registered at:
> [ 111.204367] [<800688d8>] mark_lock+0x290/0x628
> [ 111.209024] [<80069320>] __lock_acquire+0x6b0/0x1998
> [ 111.214189] [<8006ac20>] lock_acquire+0x124/0x148
> [ 111.219092] [<803de5c4>] _raw_spin_lock_bh+0x44/0x54
> [ 111.224265] [<803a9eec>] packet_poll+0x24/0xdc
> [ 111.228918] [<8032037c>] sock_poll+0x20/0x24
> [ 111.233395] [<800fc4b4>] do_select+0x2ec/0x494
> [ 111.238040] [<800fc8e0>] core_sys_select+0x284/0x354
> [ 111.243203] [<800fca8c>] sys_select+0xdc/0x10c
> [ 111.247844] [<8000d940>] ret_fast_syscall+0x0/0x3c
> [ 111.252844] irq event stamp: 4858
> [ 111.256165] hardirqs last enabled at (4857): [<80029a70>]
> local_bh_enable+0xcc/0x100
> [ 111.264032] hardirqs last disabled at (4858): [<8000d94c>]
> ret_fast_syscall+0xc/0x3c
> [ 111.271801] softirqs last enabled at (4856): [<80336768>]
> dev_queue_xmit+0x73c/0x7c4
> [ 111.279659] softirqs last disabled at (4852): [<80336048>]
> dev_queue_xmit+0x1c/0x7c4
> [ 111.287427]
> [ 111.287427] other info that might help us debug this:
> [ 111.293963] Possible unsafe locking scenario:
> [ 111.293963]
> [ 111.299889] CPU0
> [ 111.302341] ----
> [ 111.304792] lock(&(&list->lock)->rlock#4);
> [ 111.309116] <Interrupt>
> [ 111.311741] lock(&(&list->lock)->rlock#4);
> [ 111.316238]
> [ 111.316238] *** DEADLOCK ***
> [ 111.316238]
> [ 111.322170] 1 lock held by ptp4l/335:
> [ 111.325838] #0: (&(&fep->hw_lock)->rlock){-.-...}, at: [<8029d470>]
> fec_enet_interrupt+0x390/0x600
> [ 111.335068]
> [ 111.335068] stack backtrace:
> [ 111.339433] Backtrace:
> [ 111.341922] [<80011a58>] (dump_backtrace+0x0/0x10c) from [<803da940>]
> (dump_stack+0x18/0x1c)
> [ 111.350366] r6:806cfaa0 r5:806cfaa0 r4:acb62e40 r3:acb62e40
> [ 111.356111] [<803da928>] (dump_stack+0x0/0x1c) from [<800685e0>]
> (print_usage_bug+0x250/0x2b8)
> [ 111.364739] [<80068390>] (print_usage_bug+0x0/0x2b8) from [<8006899c>]
> (mark_lock+0x354/0x628)
> [ 111.373365] [<80068648>] (mark_lock+0x0/0x628) from [<8006928c>]
> (__lock_acquire+0x61c/0x1998)
> [ 111.381993] [<80068c70>] (__lock_acquire+0x0/0x1998) from [<8006ac20>]
> (lock_acquire+0x124/0x148)
> [ 111.390882] [<8006aafc>] (lock_acquire+0x0/0x148) from [<803de414>]
> (_raw_spin_lock_irqsave+0x4c/0x60)
> [ 111.400203] [<803de3c8>] (_raw_spin_lock_irqsave+0x0/0x60) from [<80328590>]
> (skb_queue_tail+0x20/0x50)
> [ 111.409601] r6:acc54198 r5:ac9ebb40 r4:acc5418c
> [ 111.414285] [<80328570>] (skb_queue_tail+0x0/0x50) from [<803286d8>]
> (sock_queue_err_skb+0x118/0x164)
> [ 111.423509] r6:00000056 r5:ac9ebb40 r4:acc54000 r3:00000000
> [ 111.429254] [<803285c0>] (sock_queue_err_skb+0x0/0x164) from [<8032ac4c>]
> (skb_tstamp_tx+0x84/0x9c)
> [ 111.438305] r7:b0042280 r6:ac9ebb58 r5:acc54000 r4:ac9ebb40
> [ 111.444049] [<8032abc8>] (skb_tstamp_tx+0x0/0x9c) from [<8029d5e4>]
> (fec_enet_interrupt+0x504/0x600)
> [ 111.453187] r6:00001c00 r5:ac780500 r4:ac780000
> [ 111.457878] [<8029d0e0>] (fec_enet_interrupt+0x0/0x600) from [<800812f0>]
> (handle_irq_event_percpu+0xbc/0x2a8)
> [ 111.467894] [<80081234>] (handle_irq_event_percpu+0x0/0x2a8) from
> [<80081520>] (handle_irq_event+0x44/0x64)
> [ 111.477654] [<800814dc>] (handle_irq_event+0x0/0x64) from [<800842f8>]
> (handle_fasteoi_irq+0xd0/0x11c)
> [ 111.486965] r6:ffffffff r5:ac012290 r4:ac012240 r3:00000000
> [ 111.492709] [<80084228>] (handle_fasteoi_irq+0x0/0x11c) from [<80080be8>]
> (generic_handle_irq+0x28/0x38)
> [ 111.502194] r5:00000000 r4:00000096
> [ 111.505820] [<80080bc0>] (generic_handle_irq+0x0/0x38) from [<8000e298>]
> (handle_IRQ+0x80/0xc0)
> [ 111.514524] r4:00000096 r3:00000220
> [ 111.518149] [<8000e218>] (handle_IRQ+0x0/0xc0) from [<8000850c>]
> (gic_handle_irq+0x40/0x64)
> [ 111.526505] r5:acc09fb0 r4:f4000100
> [ 111.530132] [<800084cc>] (gic_handle_irq+0x0/0x64) from [<803df060>]
> (__irq_usr+0x40/0x60)
> [ 111.538404] Exception stack(0xacc09fb0 to 0xacc09ff8)
> [ 111.543466] 9fa0: 00000018 00000269
> 00000000 00000000
> [ 111.551656] 9fc0: 00000001 76f615f0 3e09c05c 00000007 00000000 76f62650
> 76f63dc8 01f04e02
> [ 111.559843] 9fe0: 00000002 7ef6c218 76f4c55c 76f45aec 60000010 ffffffff
> [ 111.566463] r5:60000010 r4:76f45aec
>
>
>
It is not easy to fix. Need put tx to NAPI poll function.
I will work on that after China New year holiday
>
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