[Ocfs2-devel] ocfs2 hangs

[Dmitry Melekhov]

Hello!

I run two dovecot servers over ocfs2 for years.

Previously I used ubuntu, but migrated to Oracle Linux this year.

And all kernels older then

4.1.12-94.5.9.el7uek.x86_64

hangs with
Aug 27 07:14:17 dovecot1 kernel: INFO: task deliver:15573 blocked for more than
120 seconds.
Aug 27 07:14:17 dovecot1 kernel:      Not tainted 4.1.12-103.3.8.el7uek.x86_64
#2
Aug 27 07:14:17 dovecot1 kernel: "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Aug 27 07:14:17 dovecot1 kernel: deliver         D 0000000000000001     0 15573
  15572 0x00000080
Aug 27 07:14:17 dovecot1 kernel: ffff88003d0af6c8 0000000000000086
ffff880079039c00 ffff88007c1ff000
Aug 27 07:14:17 dovecot1 kernel: ffff88003d0af6b8 ffff88003d0b0000
ffff88003d0af890 7fffffffffffffff
Aug 27 07:14:17 dovecot1 kernel: ffff88007c1ff000 0000000000000000
ffff88003d0af6e8 ffffffff81739c57
Aug 27 07:14:17 dovecot1 kernel: Call Trace:
Aug 27 07:14:17 dovecot1 kernel: [<ffffffff81739c57>] schedule+0x37/0x90
Aug 27 07:14:17 dovecot1 kernel: [<ffffffff8173cd3c>]
schedule_timeout+0x24c/0x2c0
Aug 27 07:14:17 dovecot1 kernel: [<ffffffff811945de>] ?
find_get_entry+0x1e/0xa0
Aug 27 07:14:17 dovecot1 kernel: [<ffffffff811956a1>] ?
pagecache_get_page+0xd1/0x1a0
Aug 27 07:14:17 dovecot1 kernel: [<ffffffff812499aa>] ?
bh_lru_install+0x18a/0x1e0
Aug 27 07:14:17 dovecot1 kernel: [<ffffffff8173a844>]
wait_for_completion+0x134/0x190
Aug 27 07:14:17 dovecot1 kernel: [<ffffffff810b65c0>] ? wake_up_state+0x20/0x20
Aug 27 07:14:17 dovecot1 kernel: [<ffffffffa045d4d1>]
__ocfs2_cluster_lock.isra.36+0x231/0x9c0 [ocfs2]
Aug 27 07:14:17 dovecot1 kernel: [<ffffffffa04bab96>] ?
ocfs2_buffer_cached.isra.6+0xb6/0x240 [ocfs2]
Aug 27 07:14:17 dovecot1 kernel: [<ffffffffa045ebfa>]
ocfs2_inode_lock_full_nested+0x1da/0x530 [ocfs2]
Aug 27 07:14:17 dovecot1 kernel: [<ffffffffa045f00b>]
ocfs2_inode_lock_tracker+0xbb/0x1c0 [ocfs2]
Aug 27 07:14:17 dovecot1 kernel: [<ffffffffa04d699d>]
ocfs2_iop_get_acl+0x5d/0x25e [ocfs2]
Aug 27 07:14:17 dovecot1 kernel: [<ffffffffa047892d>] ?
ocfs2_reserve_local_alloc_bits+0x8d/0x380 [ocfs2]
Aug 27 07:14:17 dovecot1 kernel: [<ffffffff812740a7>] get_acl+0x47/0x70
Aug 27 07:14:17 dovecot1 kernel: [<ffffffff8127478a>]
posix_acl_create+0x5a/0x160
Aug 27 07:14:17 dovecot1 kernel: [<ffffffffa04818f8>] ocfs2_mknod+0x938/0x1620
[ocfs2]
Aug 27 07:14:17 dovecot1 kernel: [<ffffffffa045a599>] ?
ocfs2_wake_downconvert_thread+0x49/0x50 [ocfs2]
Aug 27 07:14:17 dovecot1 kernel: [<ffffffffa04827b6>] ocfs2_create+0x66/0x170
[ocfs2]
Aug 27 07:14:17 dovecot1 kernel: [<ffffffff8121f865>] vfs_create+0xd5/0x140
Aug 27 07:14:17 dovecot1 kernel: [<ffffffff81222a5d>] do_last+0x9ed/0x1270
Aug 27 07:14:17 dovecot1 kernel: [<ffffffff8122336f>] path_openat+0x8f/0x630
Aug 27 07:14:17 dovecot1 kernel: [<ffffffff81224dde>] ?
user_path_at_empty+0x6e/0xc0
Aug 27 07:14:17 dovecot1 kernel: [<ffffffff81224ee9>] do_filp_open+0x49/0xc0
Aug 27 07:14:17 dovecot1 kernel: [<ffffffff81351545>] ?
find_next_zero_bit+0x25/0x30
Aug 27 07:14:17 dovecot1 kernel: [<ffffffff812320a7>] ? __alloc_fd+0xa7/0x130
Aug 27 07:14:17 dovecot1 kernel: [<ffffffff81212367>] do_sys_open+0x137/0x240
Aug 27 07:14:17 dovecot1 kernel: [<ffffffff81130b16>] ?
__audit_syscall_exit+0x1e6/0x280
Aug 27 07:14:17 dovecot1 kernel: [<ffffffff811cf554>] ?
SyS_mprotect+0x1f4/0x290
Aug 27 07:14:17 dovecot1 kernel: [<ffffffff8121248e>] SyS_open+0x1e/0x20
Aug 27 07:14:17 dovecot1 kernel: [<ffffffff8173deee>]
system_call_fastpath+0x12/0x71
     
   

Here is my bug report
https://bugzilla.oracle.com/bugzilla/show_bug.cgi?id=16056

But, unfortunately, there is no activity here and bug is still not fixed 
in latest UEK kernels.

I think that Oracle takes ocfs2 from here anyway.

May be somebody knows what was changed in
4.1.12-103.3.8.el7uek ?


Thank you!<mailto:greg.marsden at oracle.com>
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