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Date: Mon, 4 Feb 2013 16:52:42 +0000 (UTC)
From: Jim Baxter <jim_baxter@...tor.com>
To: netdev@...r.kernel.org
Subject: Re: [PATCH 1/1] net: fec: fix miss init spinlock
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
--
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