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I have straced the cmsd process with successful one and not:
Successful one looks like:
[pid 294823] <... recvfrom resumed> "\377/\0\0\n\0\0\207", 8, MSG_WAITALL, NULL, NULL) = 8
[pid 294823] recvfrom(21, "\0\1\0\240\0\0\0\10\0y/store/mc/SAM/GenericT"..., 135, MSG_WAITALL, NULL, NULL) = 135
[pid 294823] futex(0x64b1b8, FUTEX_WAKE_PRIVATE, 1) = 1
[pid 300419] <... futex resumed> ) = 0
[pid 294823] recvfrom(21, <unfinished ...>
[pid 300419] stat("/cms/data/store/mc/SAM/GenericTTbar/AODSIM/CMSSW_9_2_6_91X_mcRun1_realistic_v2-v1/00000/A64CCCF2-5C76-E711-B359-0CC47A78A3F8.root", {st_mode=S_IFREG|0664, st_size=240461986, ...}) = 0
[pid 300419] writev(21, [{"\377/\0\0\2\0\0\27", 8}, {"\0\0\4Fcmsio10.rc.ufl.edu\0", 23}], 2) = 31
[pid 300419] futex(0x64b1b8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid 294827] <... nanosleep resumed> 0x7f8093e46d60) = 0

Unsuccessful one has two types of strace outputs:
[pid 335099] nanosleep({1, 0}, <unfinished ...>
[pid 335110] <... recvfrom resumed> "\377\37\0\0\n\0\0\215", 8, MSG_WAITALL, NULL, NULL) = 8
[pid 335110] recvfrom(22, "\0\1\0\240\0\0\0\10\0\177/store/mc/SAM/GenericT"..., 141, MSG_WAITALL, NULL, NULL) = 141
[pid 335110] futex(0x64b1b8, FUTEX_WAKE_PRIVATE, 1) = 1
[pid 336772] <... futex resumed> ) = 0
[pid 335110] recvfrom(22, <unfinished ...>
[pid 336772] mmap(NULL, 134217728, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, -1, 0) = 0x7fb378000000
[pid 336772] munmap(0x7fb37c000000, 67108864) = 0
[pid 336772] mprotect(0x7fb378000000, 135168, PROT_READ|PROT_WRITE) = 0
[pid 336772] stat("/cms/data/store/mc/SAM/GenericTTbar/AODSIM/CMSSW_9_2_6_91X_mcRun1_realistic_v2-v1/00000/CE860B10-5D76-E711-BCA8-FA163EAA761A_cmsuf.root", 0x7fb3979f3950) = -1 EACCES (Permission denied)

[pid 336772] stat("/cms/data/store/mc/SAM/GenericTTbar/AODSIM/CMSSW_9_2_6_91X_mcRun1_realistic_v2-v1/00000", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
[pid 336772] writev(22, [{"\377\37\0\0\1\0\0000", 8}, {"\0\0\0\1Unable to access file; file "..., 48}], 2) = 56
[pid 336772] futex(0x64b1b8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid 335099] <... nanosleep resumed> 0x7fb39d6bed60) = 0

[pid 335099] nanosleep({1, 0}, <unfinished ...>
[pid 335110] <... recvfrom resumed> "\377+\0\0\n\0\0\215", 8, MSG_WAITALL, NULL, NULL) = 8
[pid 335110] recvfrom(22, "\0\1\0\240\0\0\0\10\0\177/store/mc/SAM/GenericT"..., 141, MSG_WAITALL, NULL, NULL) = 141
[pid 335110] futex(0x64b1b8, FUTEX_WAKE_PRIVATE, 1) = 1
[pid 336772] <... futex resumed> ) = 0
[pid 335110] recvfrom(22, <unfinished ...>
[pid 336772] writev(22, [{"\377+\0\0\1\0\0000", 8}, {"\0\0\0\1Unable to access file; file "..., 48}], 2) = 56
[pid 336772] futex(0x64b1b8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid 335099] <... nanosleep resumed> 0x7fb39d6bed60) = 0
[pid 335099] nanosleep({1, 0}, 0x7fb39d6bed60) = 0

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