I'm getting this, running connectathon tests on a kernel which includes your
latest nfs-for-2.6.32. Is it new?
--b.
=======================================================
[ INFO: possible circular locking dependency detected ]
2.6.31-rc8-00162-gf7fcab6 #321
-------------------------------------------------------
bigfile/3763 is trying to acquire lock:
(&sb->s_type->i_mutex_key#11){+.+.+.}, at: [<c11cd5f2>] nfs_revalidate_mapping+0x92/0xd0
but task is already holding lock:
(&mm->mmap_sem){++++++}, at: [<c100640e>] sys_mmap2+0x8e/0xc0
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&mm->mmap_sem){++++++}:
[<c1051476>] __lock_acquire+0xef6/0x1710
[<c1051d5f>] lock_acquire+0xcf/0xf0
[<c10951cb>] might_fault+0x8b/0xb0
[<c13cb5f7>] copy_to_user+0x37/0x70
[<c10bb059>] filldir64+0xa9/0xf0
[<c11c7f82>] nfs_do_filldir+0x1e2/0x5b0
[<c11c871e>] nfs_readdir+0x3ce/0x910
[<c10bb2f5>] vfs_readdir+0x95/0xb0
[<c10bb37e>] sys_getdents64+0x6e/0xc0
[<c1002f49>] syscall_call+0x7/0xb
[<ffffffff>] 0xffffffff
-> #0 (&sb->s_type->i_mutex_key#11){+.+.+.}:
[<c10515ab>] __lock_acquire+0x102b/0x1710
[<c1051d5f>] lock_acquire+0xcf/0xf0
[<c17292ed>] mutex_lock_nested+0x5d/0x310
[<c11cd5f2>] nfs_revalidate_mapping+0x92/0xd0
[<c11ca5c8>] nfs_file_mmap+0x48/0x80
[<c109c436>] mmap_region+0x2b6/0x430
[<c109c7fd>] do_mmap_pgoff+0x24d/0x350
[<c100642d>] sys_mmap2+0xad/0xc0
[<c1002f49>] syscall_call+0x7/0xb
[<ffffffff>] 0xffffffff
other info that might help us debug this:
1 lock held by bigfile/3763:
#0: (&mm->mmap_sem){++++++}, at: [<c100640e>] sys_mmap2+0x8e/0xc0
stack backtrace:
Pid: 3763, comm: bigfile Not tainted 2.6.31-rc8-00162-gf7fcab6 #321
Call Trace:
[<c1727d29>] ? printk+0x1d/0x1f
[<c10500ac>] print_circular_bug_tail+0xbc/0xc0
[<c10515ab>] __lock_acquire+0x102b/0x1710
[<c11cd5f2>] ? nfs_revalidate_mapping+0x92/0xd0
[<c1051d5f>] lock_acquire+0xcf/0xf0
[<c11cd5f2>] ? nfs_revalidate_mapping+0x92/0xd0
[<c11cd5f2>] ? nfs_revalidate_mapping+0x92/0xd0
[<c17292ed>] mutex_lock_nested+0x5d/0x310
[<c11cd5f2>] ? nfs_revalidate_mapping+0x92/0xd0
[<c11f26f0>] ? nfs_have_delegation+0x0/0xc0
[<c11cd5f2>] nfs_revalidate_mapping+0x92/0xd0
[<c11ca5c8>] nfs_file_mmap+0x48/0x80
[<c109c436>] mmap_region+0x2b6/0x430
[<c109c7fd>] do_mmap_pgoff+0x24d/0x350
[<c100642d>] sys_mmap2+0xad/0xc0
[<c1002f49>] syscall_call+0x7/0xb
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