Hello guys, I've got a bunch of hang tasks of the nfsd service running over the cephfs (kernel) mounted file system. Here is an example of one of them.
[433079.991218] INFO: task nfsd:32625 blocked for more than 120 seconds. [433080.029685] Not tainted 3.15.10-031510-generic #201408132333 [433080.068036] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [433080.144235] nfsd D 000000000000000a 0 32625 2 0x00000000 [433080.144241] ffff8801a94dba78 0000000000000002 ffff8801a94dba38 ffff8801a94dbfd8 [433080.144244] 0000000000014540 0000000000014540 ffff880673d63260 ffff880491d264c0 [433080.144247] ffff8801a94dba78 ffff88067fd14e40 ffff880491d264c0 ffffffff8115dff0 [433080.144250] Call Trace: [433080.144260] [<ffffffff8115dff0>] ? __lock_page+0x70/0x70 [433080.144274] [<ffffffff81778449>] schedule+0x29/0x70 [433080.144279] [<ffffffff8177851f>] io_schedule+0x8f/0xd0 [433080.144282] [<ffffffff8115dffe>] sleep_on_page+0xe/0x20 [433080.144286] [<ffffffff81778be2>] __wait_on_bit+0x62/0x90 [433080.144288] [<ffffffff8115eacb>] ? find_get_pages_tag+0xcb/0x170 [433080.144291] [<ffffffff8115e160>] wait_on_page_bit+0x80/0x90 [433080.144296] [<ffffffff810b54a0>] ? wake_atomic_t_function+0x40/0x40 [433080.144299] [<ffffffff8115e334>] filemap_fdatawait_range+0xf4/0x180 [433080.144302] [<ffffffff8116027d>] filemap_write_and_wait_range+0x4d/0x80 [433080.144315] [<ffffffffa06bf1b8>] ceph_fsync+0x58/0x200 [ceph] [433080.144330] [<ffffffff813308f5>] ? ima_file_check+0x35/0x40 [433080.144337] [<ffffffff812028c8>] vfs_fsync_range+0x18/0x30 [433080.144352] [<ffffffffa03ee491>] nfsd_commit+0xb1/0xd0 [nfsd] [433080.144363] [<ffffffffa03fb787>] nfsd4_commit+0x57/0x60 [nfsd] [433080.144370] [<ffffffffa03fcf9e>] nfsd4_proc_compound+0x54e/0x740 [nfsd] [433080.144377] [<ffffffffa03e8e05>] nfsd_dispatch+0xe5/0x230 [nfsd] [433080.144401] [<ffffffffa03205a5>] svc_process_common+0x345/0x680 [sunrpc] [433080.144413] [<ffffffffa0320c33>] svc_process+0x103/0x160 [sunrpc] [433080.144418] [<ffffffffa03e895f>] nfsd+0xbf/0x130 [nfsd] [433080.144424] [<ffffffffa03e88a0>] ? nfsd_destroy+0x80/0x80 [nfsd] [433080.144428] [<ffffffff81091439>] kthread+0xc9/0xe0 [433080.144431] [<ffffffff81091370>] ? flush_kthread_worker+0xb0/0xb0 [433080.144434] [<ffffffff8178567c>] ret_from_fork+0x7c/0xb0 [433080.144437] [<ffffffff81091370>] ? flush_kthread_worker+0xb0/0xb0 I am using Ubuntu 12.04 servers with 3.15.10 kernel and ceph Giant. Thanks Andrei
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