[Ocfs2-devel] [Question] deadlock on chmod when running discontigous block group multiple node testing

[Eric Ren]

Hi Junxiao,

As the subject, the testing hung there on a kernel without your patches:

"ocfs2: revert using ocfs2_acl_chmod to avoid inode cluster lock hang"
and
"ocfs2: fix posix_acl_create deadlock"

The stack trace is:
```
ocfs2cts1:~ # pstree -pl 24133
discontig_runne(24133)───activate_discon(21156)───mpirun(15146)─┬─fillup_contig_b(15149)───sudo(15231)───chmod(15232)

ocfs2cts1:~ # pgrep -a chmod
15232 /bin/chmod -R 777 /mnt/ocfs2

ocfs2cts1:~ # cat /proc/15232/stack
[<ffffffffa05377ef>] __ocfs2_cluster_lock.isra.39+0x1bf/0x620 [ocfs2]
[<ffffffffa053856d>] ocfs2_inode_lock_full_nested+0x12d/0x840 [ocfs2]
[<ffffffffa0538dbb>] ocfs2_inode_lock_atime+0xcb/0x170 [ocfs2]
[<ffffffffa0531e61>] ocfs2_readdir+0x41/0x1b0 [ocfs2]
[<ffffffff8120d03c>] iterate_dir+0x9c/0x110
[<ffffffff8120d453>] SyS_getdents+0x83/0xf0
[<ffffffff815e126e>] entry_SYSCALL_64_fastpath+0x12/0x6d
[<ffffffffffffffff>] 0xffffffffffffffff
```

Do you think this issue can be fixed by your patches?

I will try your patches later, but I am little worried the possibility of reproduction may 
not be 100%.
So ask you to confirm;-)

Eric
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