The host with Percona-Server-5.5.16 stopped with kernel panic.
Pid: 18409, comm: mysqld Tainted: G M D ---------------- 2.6.32-71.29.1.el6.x86_64 #1
 ? print_oops_end_marker+0x23/0x30
 ? _spin_lock+0x1e/0x30
<>  task_rq_lock+0x5d/0xa0
 ? xfs_log_reserve+0xf0/0x150 [xfs]
 ? xfs_trans_reserve+0xa0/0x210 [xfs]
 ? xfs_trans_unlocked_item+0x39/0x60 [xfs]
 ? xfs_iunlock+0x86/0x100 [xfs]
 ? xfs_fsync+0x168/0x1c0 [xfs]
 ? audit_syscall_entry+0x272/0x2a0
There’s no reason to ask my question here but ‘mysqld’ at the top.
I’ve got extra worry 'cause the same panic occured 2 weeks ago on another host with the same Percona server.
Please, what can cause the failures?
DB files lie on XFS, as you can suspect.