Re: [LKP] [ocfs2] e2ac55b6a8e: ocfs2_init:1612 ERROR: Unable to create ocfs2 debugfs root

From: Chengyu Song <csong84@gatech.edu>
To: Huang Ying <ying.huang@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
	LKML <linux-kernel@vger.kernel.org>, LKP ML <lkp@01.org>
Subject: Re: [LKP] [ocfs2] e2ac55b6a8e: ocfs2_init:1612 ERROR: Unable to create ocfs2 debugfs root
Date: Sun, 19 Apr 2015 23:45:00 -0400	[thread overview]
Message-ID: <465C1C8A-0819-4253-9525-6168CCCA133A@gatech.edu> (raw)
In-Reply-To: <1429500330.7977.29.camel@intel.com>

Hi Ying,

As suggested in the patch,  -19 (-ENODEV) happens when debugfs is not configured (see include/linux/debugfs.h). So if debugfs is necessary for the functionality, in Kconfig, we should either declare it as a dependency, or auto select it.

Chengyu

> On Apr 19, 2015, at 11:25 PM, Huang Ying <ying.huang@intel.com> wrote:
> 
> FYI, we noticed the below changes on
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> commit e2ac55b6a8e337fac7cc59c6f452caac92ab5ee6 ("ocfs2: incorrect check for debugfs returns")
> 
> We found something as below in dmesg.
> 
> [    1.225136] VFS: Disk quotas dquot_6.5.2
> [    1.225814] VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
> [    1.228207] (swapper/0,1,0):ocfs2_init:1612 ERROR: Unable to create ocfs2 debugfs root.
> [    1.232445] (swapper/0,1,0):ocfs2_init:1634 ERROR: status = -19
> [    1.233223] ocfs2: Registered cluster interface o2cb
> [    1.233994] OCFS2 User DLM kernel interface loaded
> [    1.234618] (swapper/0,1,0):o2hb_debug_init:1318 ERROR: status = -19
> [    1.236183] gfs2: GFS2 installed
> [    1.238123] Key type asymmetric registered
> 
> BUG: kernel boot hang
> Elapsed time: 310
> qemu-system-i386 -enable-kvm -cpu Haswell,+smep,+smap -kernel /kernel/i386-randconfig-ib0-04172352/e2ac55b6a8e337fac7cc59c6f452caac92ab5ee6/vmlinuz-4.0.0-02646-ge2ac55b -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-vp-quantal-i386-23/rand_boot-1-quantal-core-i386.cgz-i386-randconfig-ib0-04172352-e2ac55b6a8e337fac7cc59c6f452caac92ab5ee6-1-20150418-31554-1woqtdb.yaml ARCH=i386 kconfig=i386-randconfig-ib0-04172352 branch=linus/master commit=e2ac55b6a8e337fac7cc59c6f452caac92ab5ee6 BOOT_IMAGE=/kernel/i386-randconfig-ib0-04172352/e2ac55b6a8e337fac7cc59c6f452caac92ab5ee6/vmlinuz-4.0.0-02646-ge2ac55b RESULT_ROOT=/result/vm-vp-quantal-i386/boot/1/quantal-core-i386.cgz/i386-randconfig-ib0-04172352/e2ac55b6a8e337fac7cc59c6f452caac92ab5ee6/0 LKP_SERVER=inn earlyprintk=ttyS0,115200 rd.udev.log-priority=err systemd.log_target=journal systemd.log_level=warning debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 console=ttyS0,115200 console=tty0 vga=normal rw ip=::::vm-vp-quantal-i386-23::dhcp drbd.minor_count=8'  -initrd /fs/sde1/initrd-vm-vp-quantal-i386-23 -m 360 -smp 1 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -pidfile /dev/shm/kboot/pid-vm-vp-quantal-i386-23 -serial file:/dev/shm/kboot/serial-vm-vp-quantal-i386-23 -daemonize -display none -monitor null 
> 
> Thanks,
> Ying Huang
> 
> <config-4.0.0-02646-ge2ac55b><.dmesg.txt>_______________________________________________
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