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SubjectRe: [hrtimer_active ^W ata_port_wait_eh] INFO: trying to register non-static key.
On Tue, 21 Nov 2017, Fengguang Wu wrote:

> Hello,
>
> FYI this happens in mainline kernel 4.14.0-12872-g020aae3.
> It looks like a new regression after 4.14.
>
> It occurs in 126 out of 945 boots.
>
> [ 33.016892] INFO: trying to register non-static key.
> [ 33.017745] the code is fine but needs lockdep annotation.
> [ 33.018798] turning off the locking correctness validator.
> [ 33.019713] CPU: 0 PID: 72 Comm: kworker/u4:5 Not tainted 4.14.0-12872-g020aae3 #1
> [ 33.020085] scsi host0: ata_piix
> [ 33.020729] Workqueue: events_unbound async_run_entry_fn
> [ 33.020729] Call Trace:
> [ 33.020729] dump_stack+0x7b/0xa9:
> dump_stack at lib/dump_stack.c:55
> [ 33.020729] register_lock_class+0x3bb/0x583:
> register_lock_class at kernel/locking/lockdep.c:782
> [ 33.020729] ? hrtimer_active+0x92/0x99:
> hrtimer_active at kernel/time/hrtimer.c:1151
> [ 33.020729] ? hrtimer_try_to_cancel+0x23/0xb6:
> hrtimer_try_to_cancel at kernel/time/hrtimer.c:1016

hrtimer_active() does not contain anything which might register a lock
class. And that calltrace continues:

[ 33.020729] Call Trace:
[ 33.020729] dump_stack+0x7b/0xa9
[ 33.020729] register_lock_class+0x3bb/0x583
[ 33.020729] ? hrtimer_active+0x92/0x99
[ 33.020729] ? hrtimer_try_to_cancel+0x23/0xb6
[ 33.026718] scsi host1: ata_piix
[ 33.027134] ata3: PATA max MWDMA2 cmd 0x1f0 ctl 0x3f6 bmdma 0xc040 irq 14
[ 33.027138] ata4: PATA max MWDMA2 cmd 0x170 ctl 0x376 bmdma 0xc048 irq 15
[ 33.028426] Error: Driver 'pata_platform' is already registered, aborting...
[ 33.033725] Rounding down aligned max_sectors from 4294967295 to 4294967288
[ 33.040417] __lock_acquire+0x58/0x86c
[ 33.048261] SSFDC read-only Flash Translation layer
[ 33.048264] mtdoops: mtd device (mtddev=name/number) must be supplied
[ 33.048276] device id = 2440
[ 33.048280] device id = 2480
[ 33.048283] device id = 24c0
[ 33.048286] device id = 24d0
[ 33.048289] device id = 25a1
[ 33.048292] device id = 2670
[ 33.048413] platform physmap-flash.0: failed to claim resource 0: [mem 0x08000000-0x07ffffff]
[ 33.048781] Ramix PMC551 PCI Mezzanine Ram Driver. (C) 1999,2000 Nortel Networks.
[ 33.048784] pmc551: not detected
[ 33.060052] lock_acquire+0x61/0x7c
[ 33.060052] ? ata_port_wait_eh+0x7b/0xe1
[ 33.060052] _raw_spin_lock_irqsave+0x47/0x81
[ 33.060052] ? ata_port_wait_eh+0x7b/0xe1
[ 33.060052] ata_port_wait_eh+0x7b/0xe1
[ 33.060052] ? print_dl_stats+0x27/0x27
[ 33.060052] ata_port_probe+0x2c/0x4f
[ 33.060052] async_port_probe+0x33/0x59
[ 33.060052] async_run_entry_fn+0x3d/0x127
[ 33.060052] process_one_work+0x244/0x529
[ 33.060052] ? process_one_work+0x216/0x529
[ 33.060052] worker_thread+0x56/0x4d9
[ 33.060052] kthread+0x115/0x152
[ 33.060052] ? process_one_work+0x529/0x529
[ 33.060052] ? __kthread_create_on_node+0x190/0x190
[ 33.060052] ret_from_fork+0x1f/0x30

And looking at the calltrace entries which have no '?' in front you should
look at ata_port_wait_eh() which makes a lot more sense.

Thanks,

tglx

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