lstat() hangs on single file

[Blade Doyle <blade.doyle@xxxxxxxxx>]

After several months of use without needing any administration at all, I think I finally found something to debug.

Attempting to "ls -l" within a directory on CephFS hangs - strace shows its hanging on lstat():

open("/etc/group", O_RDONLY|O_CLOEXEC)  = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=1190, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fc9f780b000
read(4, "root:x:0:\nbin:x:1:bin,daemon\ndae"..., 4096) = 1190
close(4)                                = 0
munmap(0x7fc9f780b000, 4096)            = 0
lstat("sn0546_h264m_1280x720_1872.mp4",

My cluster is healthy, except for the usual "4 requests are blocked > 32 sec".  I scanned the logs but don't find indication of an error.

Where should I look next?

Thanks Much,

Blade

(9-node ceph cluster mixed armv7 and x86_64)

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