Unrecognized line: Was the 'perf record' command properly terminated? at FlameGraph/stackcollapse-perf.pl line 339, <> line 2.

[dingjingzhen]

@brendangregg hi，I admire you for a long time,but now i have a question that When I am with 'perf record' ,it is over before the sleep time was reached,and did not show any information. the flame graph shows: Unrecognized line: Was the 'perf record' command properly terminated?The at FlameGraph/stackcollapse - perf. Pl line 339, < > the line 2.
Can you give me some advice?

[wawababe]

Same issues happens when I use perf to record memory events. StackCollapse-perf.pl always says unreconnized line.... Hope you can fix it.

Here are the commands I used:

perf record -e kmem:kmalloc -a -g -- sleep 120
perf script > qmkg_ktv_rec_re-kmalloc.perf
./stackcollapse-perf.pl qmkg_ktv_rec_re-kmalloc.perf > qmkg_ktv_rec_re-kmalloc.folded

Unrecognized line: qmkg_ktv_rec_re 27765 [017] 7911704.926324: kmem:kmalloc: call_site=ffffffff813b3b4e ptr=0xffff881f65f35360 bytes_req=32 bytes_alloc=32 gfp_flags=GFP_NOWAIT at ./stackcollapse-perf.pl line 424, <> line 585852.