linux-kernel - kernfs: trying to register non-static key in kernfs_iop

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Date:	Tue, 01 Apr 2014 09:08:02 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Greg KH <greg@...ah.com>, Tejun Heo <tj@...nel.org>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: kernfs: trying to register non-static key in kernfs_iop_listxattr

Hi all,

While fuzzing with trinity inside a KVM tools guest running latest -next
kernel I've stumbled on the following:

[ 1316.776480] INFO: trying to register non-static key.
[ 1316.778981] the code is fine but needs lockdep annotation.
[ 1316.780364] turning off the locking correctness validator.
[ 1316.780364] CPU: 25 PID: 29352 Comm: trinity-c162 Not tainted 3.14.0-rc8-next-20140331-sasha-00013-g7a8780f #351
[ 1316.780364]  0000000000000000 ffff8805898cbc98 ffffffffbb4bc9a3 0000000000000000
[ 1316.780364]  ffffffffbf375390 ffff8805898cbd98 ffffffffb81c3942 ffff8806ac800a70
[ 1316.780364]  0000000000000000 0000000100000001[child40:30166] Chose rand_syscalls. ffff880600000000 ffffffffb8330371
[ 1316.780364] Call Trace:
[ 1316.780364] dump_stack (lib/dump_stack.c:52)
[ 1316.780364] __lock_acquire (kernel/locking/lockdep.c:743 kernel/locking/lockdep.c:3078)
[ 1316.780364] ? listxattr (fs/xattr.c:550)
[ 1316.792691] ? listxattr (fs/xattr.c:550)
[ 1316.792691] ? debug_smp_processor_id (lib/smp_processor_id.c:57)
[ 1316.792691] ? __slab_alloc (mm/slub.c:2385 (discriminator 2))
[ 1316.792691] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63)
[ 1316.792691] ? trace_hardirqs_on_caller (kernel/locking/lockdep.c:2557 kernel/locking/lockdep.c:2599)
[ 1316.792691] lock_acquire (arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3602)
[ 1316.792691] ? simple_xattr_list (fs/xattr.c:982)
[ 1316.797929] ? sched_clock (arch/x86/include/asm/paravirt.h:192 arch/x86/kernel/tsc.c:305)
[ 1316.797929] _raw_spin_lock (include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:151)
[ 1316.797929] ? simple_xattr_list (fs/xattr.c:982)
[ 1316.797929] simple_xattr_list (fs/xattr.c:982)
[ 1316.797929] kernfs_iop_listxattr (fs/kernfs/inode.c:239)
[ 1316.797929] vfs_listxattr (fs/xattr.c:276)
[ 1316.797929] listxattr (fs/xattr.c:559)
[ 1316.797929] SyS_flistxattr (include/linux/file.h:38 fs/xattr.c:621 fs/xattr.c:612)
[ 1316.797929] ? tracesys (arch/x86/kernel/entry_64.S:738)
[ 1316.797929] tracesys (arch/x86/kernel/entry_64.S:749)


Thanks,
Sasha
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