Hi all,
starting from a few weeks I started observing these crashes while using the 
Python
wrapper STPyV8 [1]. I am the lead developer of STPyV8 and no relevant 
changes were
introduced recently other than updating the V8 version to use in the 
building process. 
This trace was generated using V8 12.2.281.19

<--- Last few GCs --->

[380775:0x17d0000]   254778 ms: Scavenge 75.3 (80.3) -> 73.4 (80.3) MB, 
pooled: 0 MB, 0.31 / 0.00 ms  (average mu = 1.000, current mu = 1.000) 
allocation failure;
[380775:0x17d0000]   254783 ms: Scavenge 75.3 (80.3) -> 73.4 (80.3) MB, 
pooled: 0 MB, 0.31 / 0.00 ms  (average mu = 1.000, current mu = 1.000) 
allocation failure;
[380775:0x17d0000]   265747 ms: Scavenge 76.3 (81.5) -> 75.1 (79.0) MB, 
pooled: 2 MB, 0.88 / 0.05 ms  (average mu = 1.000, current mu = 1.000) 
allocation failure;


<--- JS stacktrace --->



#
# Fatal process out of memory: 
DateTimePatternGeneratorCache::CreateGenerator
#
==== C stack trace ===============================

    
/opt/env/lib/python3.9/site-packages/_STPyV8.cpython-39-x86_64-linux-gnu.so(v8::base::debug::StackTrace::StackTrace()+0x13)
 
[0x7f7d3ef16503]
    
/opt/env/lib/python3.9/site-packages/_STPyV8.cpython-39-x86_64-linux-gnu.so(+0xcf419b)
 
[0x7f7d3ef1819b]
    
/opt/env/lib/python3.9/site-packages/_STPyV8.cpython-39-x86_64-linux-gnu.so(v8::base::FatalOOM(v8::base::OOMType,
 
char const*)+0x38) [0x7f7d3f879f68]
    
/opt/env/lib/python3.9/site-packages/_STPyV8.cpython-39-x86_64-linux-gnu.so(v8::internal::V8::FatalProcessOutOfMemory(v8::internal::Isolate*,
 
char const*, v8::OOMDetails const&)+0x2ac) [0x7f7d3ef1b58c]
    
/opt/env/lib/python3.9/site-packages/_STPyV8.cpython-39-x86_64-linux-gnu.so(+0xfe498a)
 
[0x7f7d3f20898a]
    
/opt/env/lib/python3.9/site-packages/_STPyV8.cpython-39-x86_64-linux-gnu.so(v8::internal::JSDateTimeFormat::CreateDateTimeFormat(v8::internal::Isolate*,
 
v8::internal::Handle<v8::internal::Map>, 
v8::internal::Handle<v8::internal::Object>, 
v8::internal::Handle<v8::internal::Object>, 
v8::internal::JSDateTimeFormat::RequiredOption, 
v8::internal::JSDateTimeFormat::DefaultsOption, char const*)+0x8b6) 
[0x7f7d3f206e06]
    
/opt/env/lib/python3.9/site-packages/_STPyV8.cpython-39-x86_64-linux-gnu.so(v8::internal::JSDateTimeFormat::New(v8::internal::Isolate*,
 
v8::internal::Handle<v8::internal::Map>, 
v8::internal::Handle<v8::internal::Object>, 
v8::internal::Handle<v8::internal::Object>, char const*)+0x1a) 
[0x7f7d3f207efa]
    
/opt/env/lib/python3.9/site-packages/_STPyV8.cpython-39-x86_64-linux-gnu.so(v8::internal::Builtin_DateTimeFormatConstructor(int,
 
unsigned long*, v8::internal::Isolate*)+0xfe) [0x7f7d3f8bed4e]
    
/opt/env/lib/python3.9/site-packages/_STPyV8.cpython-39-x86_64-linux-gnu.so(+0x151e5b6)
 
[0x7f7d3f7425b6]

Regards,
Angelo

[1] https://github.com/cloudflare/stpyv8

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