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Date:	Sat, 9 Nov 2013 23:35:13 -0700
From:	Kevin Fenzi <kevin@...ye.com>
To:	Kevin Fenzi <kevin@...ye.com>
Cc:	AceLan Kao <acelan.kao@...onical.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Nikolai Kondrashov <spbnick@...il.com>,
	Josh Boyer <jwboyer@...oraproject.org>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>
Subject: Re: ELAN Touchscreen regression in recent 3.12 rc's? (USB)

Well, that was fun. ;) 

git bisect start
# bad: [69c88dc7d9f1a6c3eceb7058111677c640811c94] vfs: fix new kernel-doc warnings
git bisect bad 69c88dc7d9f1a6c3eceb7058111677c640811c94
# good: [31d141e3a666269a3b6fcccddb0351caf7454240] Linux 3.12-rc6
git bisect good 31d141e3a666269a3b6fcccddb0351caf7454240
# good: [b403b73c21fcab11411a1439867a3ead9117e5e4] Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux
git bisect good b403b73c21fcab11411a1439867a3ead9117e5e4
# good: [d55f0691c041dba46daad7790b8f2631acb55f9a] Merge remote-tracking branch 'asoc/fix/pcm1792a' into asoc-linus
git bisect good d55f0691c041dba46daad7790b8f2631acb55f9a
# good: [20c87bd40e6c1ff7e31cc5eea4fb37829a57eb58] Merge tag 'asoc-v3.12-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus
git bisect good 20c87bd40e6c1ff7e31cc5eea4fb37829a57eb58
# good: [d24fec3991076124e069c889c530cdc69cd43fb8] Merge tag 'jfs-3.12' of git://github.com/kleikamp/linux-shaggy
git bisect good d24fec3991076124e069c889c530cdc69cd43fb8
# good: [93cd00043fffec840fa36909c4a8eb0f735dfb04] Merge tag 'sound-3.12' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
git bisect good 93cd00043fffec840fa36909c4a8eb0f735dfb04
# good: [606d6fe3ffdb5190d4c8e4d6cd23aa6c1f9cb6ad] fs/namei.c: fix new kernel-doc warning
git bisect good 606d6fe3ffdb5190d4c8e4d6cd23aa6c1f9cb6ad
# first bad commit: [69c88dc7d9f1a6c3eceb7058111677c640811c94] vfs: fix
new kernel-doc warnings

Which is... nonsense. ;) 

So, I tried the first bad commit again and it works. 

After a small period of head scratching, I noticed that the other change
in the non working kernel was re-enabling debugging options. 

So, I rebuild locally the bad kernel with the debugging config and
sure enough it's back. 

So, it's some debugging option causing it.

I can try and bisect again with debugging config but I just got this laptop
recently, so it could be that all debugging kernels have the issue and it's 
nothing recent?

The diff of configs is attached in case anything leaps out at people: 

kevin
--
164c164
< CONFIG_DEBUG_BLK_CGROUP=y
---
> # CONFIG_DEBUG_BLK_CGROUP is not set
211d210
< CONFIG_PERF_USE_VMALLOC=y
217c216
< CONFIG_DEBUG_PERF_USE_VMALLOC=y
---
> # CONFIG_DEBUG_PERF_USE_VMALLOC is not set
286c285
< CONFIG_MODULE_FORCE_UNLOAD=y
---
> # CONFIG_MODULE_FORCE_UNLOAD is not set
346c345,350
< CONFIG_UNINLINE_SPIN_UNLOCK=y
---
> CONFIG_INLINE_SPIN_UNLOCK_IRQ=y
> CONFIG_INLINE_READ_UNLOCK=y
> CONFIG_INLINE_READ_UNLOCK_IRQ=y
> CONFIG_INLINE_WRITE_UNLOCK=y
> CONFIG_INLINE_WRITE_UNLOCK_IRQ=y
> CONFIG_MUTEX_SPIN_ON_OWNER=y
402,403c406,407
< CONFIG_MAXSMP=y
< CONFIG_NR_CPUS=4096
---
> # CONFIG_MAXSMP is not set
> CONFIG_NR_CPUS=128
409d412
< CONFIG_PREEMPT_COUNT=y
437c440
< CONFIG_NODES_SHIFT=10
---
> CONFIG_NODES_SHIFT=9
460c463
< CONFIG_SPLIT_PTLOCK_CPUS=999999
---
> CONFIG_SPLIT_PTLOCK_CPUS=4
484c487
< CONFIG_X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK=y
---
> # CONFIG_X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK is not set
535c538
< CONFIG_PM_TEST_SUSPEND=y
---
> # CONFIG_PM_TEST_SUSPEND is not set
561c564
< CONFIG_ACPI_DEBUG=y
---
> # CONFIG_ACPI_DEBUG is not set
1391c1394
< CONFIG_CEPH_LIB_PRETTYDEBUG=y
---
> # CONFIG_CEPH_LIB_PRETTYDEBUG is not set
1545c1548
< CONFIG_DRBD_FAULT_INJECTION=y
---
> # CONFIG_DRBD_FAULT_INJECTION is not set
2293c2296
< CONFIG_ATH_DEBUG=y
---
> # CONFIG_ATH_DEBUG is not set
2311c2314
< CONFIG_CARL9170_DEBUGFS=y
---
> # CONFIG_CARL9170_DEBUGFS is not set
2342c2345
< CONFIG_B43_DEBUG=y
---
> # CONFIG_B43_DEBUG is not set
2348c2351
< CONFIG_B43LEGACY_DEBUG=y
---
> # CONFIG_B43LEGACY_DEBUG is not set
2384c2387
< CONFIG_IWLWIFI_DEVICE_TRACING=y
---
> # CONFIG_IWLWIFI_DEVICE_TRACING is not set
4745,4746c4748
< CONFIG_DMADEVICES_DEBUG=y
< CONFIG_DMADEVICES_VDEBUG=y
---
> # CONFIG_DMADEVICES_DEBUG is not set
5202c5204
< CONFIG_EXT4_DEBUG=y
---
> # CONFIG_EXT4_DEBUG is not set
5204c5206
< CONFIG_JBD2_DEBUG=y
---
> # CONFIG_JBD2_DEBUG is not set
5249c5251
< CONFIG_QUOTA_DEBUG=y
---
> # CONFIG_QUOTA_DEBUG is not set
5380c5382
< CONFIG_NFSD_FAULT_INJECTION=y
---
> # CONFIG_NFSD_FAULT_INJECTION is not set
5505c5507
< CONFIG_DEBUG_FORCE_WEAK_PER_CPU=y
---
> # CONFIG_DEBUG_FORCE_WEAK_PER_CPU is not set
5513,5521c5515,5516
< CONFIG_DEBUG_OBJECTS=y
< # CONFIG_DEBUG_OBJECTS_SELFTEST is not set
< CONFIG_DEBUG_OBJECTS_FREE=y
< CONFIG_DEBUG_OBJECTS_TIMERS=y
< CONFIG_DEBUG_OBJECTS_WORK=y
< CONFIG_DEBUG_OBJECTS_RCU_HEAD=y
< CONFIG_DEBUG_OBJECTS_PERCPU_COUNTER=y
< CONFIG_DEBUG_OBJECTS_ENABLE_DEFAULT=1
< CONFIG_SLUB_DEBUG_ON=y
---
> # CONFIG_DEBUG_OBJECTS is not set
> # CONFIG_SLUB_DEBUG_ON is not set
5524,5528c5519,5520
< CONFIG_DEBUG_KMEMLEAK=y
< CONFIG_DEBUG_KMEMLEAK_EARLY_LOG_SIZE=1024
< # CONFIG_DEBUG_KMEMLEAK_TEST is not set
< CONFIG_DEBUG_KMEMLEAK_DEFAULT_OFF=y
< CONFIG_DEBUG_STACK_USAGE=y
---
> # CONFIG_DEBUG_KMEMLEAK is not set
> # CONFIG_DEBUG_STACK_USAGE is not set
5548,5551c5540
< CONFIG_DETECT_HUNG_TASK=y
< CONFIG_DEFAULT_HUNG_TASK_TIMEOUT=120
< # CONFIG_BOOTPARAM_HUNG_TASK_PANIC is not set
< CONFIG_BOOTPARAM_HUNG_TASK_PANIC_VALUE=0
---
> # CONFIG_DETECT_HUNG_TASK is not set
5561,5562c5550
< CONFIG_DEBUG_RT_MUTEXES=y
< CONFIG_DEBUG_PI_LIST=y
---
> # CONFIG_DEBUG_RT_MUTEXES is not set
5564,5572c5552,5558
< CONFIG_DEBUG_SPINLOCK=y
< CONFIG_DEBUG_MUTEXES=y
< CONFIG_DEBUG_WW_MUTEX_SLOWPATH=y
< CONFIG_DEBUG_LOCK_ALLOC=y
< CONFIG_PROVE_LOCKING=y
< CONFIG_LOCKDEP=y
< CONFIG_LOCK_STAT=y
< # CONFIG_DEBUG_LOCKDEP is not set
< CONFIG_DEBUG_ATOMIC_SLEEP=y
---
> # CONFIG_DEBUG_SPINLOCK is not set
> # CONFIG_DEBUG_MUTEXES is not set
> # CONFIG_DEBUG_WW_MUTEX_SLOWPATH is not set
> # CONFIG_DEBUG_LOCK_ALLOC is not set
> # CONFIG_PROVE_LOCKING is not set
> # CONFIG_LOCK_STAT is not set
> # CONFIG_DEBUG_ATOMIC_SLEEP is not set
5574d5559
< CONFIG_TRACE_IRQFLAGS=y
5579c5564
< CONFIG_DEBUG_WRITECOUNT=y
---
> # CONFIG_DEBUG_WRITECOUNT is not set
5581,5583c5566,5568
< CONFIG_DEBUG_SG=y
< CONFIG_DEBUG_NOTIFIERS=y
< CONFIG_DEBUG_CREDENTIALS=y
---
> # CONFIG_DEBUG_SG is not set
> # CONFIG_DEBUG_NOTIFIERS is not set
> # CONFIG_DEBUG_CREDENTIALS is not set
5588,5589d5572
< CONFIG_PROVE_RCU=y
< # CONFIG_PROVE_RCU_REPEATEDLY is not set
5597,5603c5580
< CONFIG_FAULT_INJECTION=y
< CONFIG_FAILSLAB=y
< CONFIG_FAIL_PAGE_ALLOC=y
< CONFIG_FAIL_MAKE_REQUEST=y
< CONFIG_FAIL_IO_TIMEOUT=y
< CONFIG_FAIL_MMC_REQUEST=y
< CONFIG_FAULT_INJECTION_DEBUG_FS=y
---
> # CONFIG_FAULT_INJECTION is not set
5649,5650c5626
< CONFIG_MMIOTRACE=y
< # CONFIG_MMIOTRACE_TEST is not set
---
> # CONFIG_MMIOTRACE is not set
5658c5634
< CONFIG_TEST_LIST_SORT=y
---
> # CONFIG_TEST_LIST_SORT is not set
5670c5646
< CONFIG_DMA_API_DEBUG=y
---
> # CONFIG_DMA_API_DEBUG is not set
5685c5661
< CONFIG_X86_PTDUMP=y
---
> # CONFIG_X86_PTDUMP is not set
5709c5685
< CONFIG_X86_DEBUG_STATIC_CPU_HAS=y
---
> # CONFIG_X86_DEBUG_STATIC_CPU_HAS is not set
5924a5901
> CONFIG_CMPXCHG_LOCKREF=y
5973d5949
< CONFIG_CPUMASK_OFFSTACK=y

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