Instruction trace error leading to error in trace loader of perfetto

[rohanaggarwal7997]

Hi on using magic on a perf.data trace from intel pt i see the following output

[ Decoding, this takes a while... ]
Warning:
Processed 123788558 events and lost 52 chunks!

Check IO/CPU overload!

Warning:
1 instruction trace errors

On loading this fxt file to trace-loader of perfetto (as the file is larger than 2 gb), i face the following

[414.011] trace_sorter_queue.h:44 PERFETTO_CHECK(mem_blocks_.size() == 1) (errno: 0, Undefined error: 0)

-----BEGIN PERFETTO PRE-CRASH LOG-----
trace_uuid: 00000000-0000-0000-d919-7e42f24
[414.011] trace_sorter_queue.h:44 PERFETTO_CHECK(mem_blocks_.size() == 1) (errno: 0, Undefined error: 0)

-----END PERFETTO PRE-CRASH LOG-----
Illegal instruction

Is the problem in magic or in perfetto ? Any way to avoid this ?

perf command used was

perf record -m,512M --tid 13594 -e intel_pt/cyc=1,noretcomp=1/u -o output_location usleep 250000
warning: usleep is deprecated, and will be removed in near future!
warning: use "sleep 0.25" instead...
[ perf record: Woken up 17 times to write data ]
Warning:
Processed 726120 events and lost 52 chunks!
Check IO/CPU overload!
[ perf record: Captured and wrote 451.856 MB output_location ]

[rohanaggarwal7997]

If i understand correctly, this is happening because of the following in my perf.data file.

instruction trace error type 1 time 2511250.194562356 cpu 26 pid 12975 tid 13594 ip 0x7fbfa0be98b6 code 7: Overflow packet

Is there a way to avoid this check in perfetto Or edit my perf.data file in someway that i don't hit this Or change magic in someway so that we ignore this ?

[rohanaggarwal7997]

Actually no
it happens even without that

perf script -i file.data --itrace=e
Warning:
Processed 850658 events and lost 52 chunks!

Check IO/CPU overload!

./magic-trace decode -executable binary_path -working-directory .
[ Decoding, this takes a while... ]
Warning:
Processed 129071321 events and lost 52 chunks!

Check IO/CPU overload!

Visit https://magic-trace.org/ and open trace.fxt to view trace.

[615.259] trace_sorter_queue.h:44 PERFETTO_CHECK(mem_blocks_.size() == 1) (errno: 0, Undefined error: 0)

-----END PERFETTO PRE-CRASH LOG-----
Illegal instruction