rgw/sfs: segfault on 's3tests_boto3.functional.test_s3.test_post_object_anonymous_request'

[jecluis]

Easily reproducible with nosetests -v -s s3tests_boto3.functional.test_s3:test_post_object_anonymous_request.

Version under test: s3gw as of 2022-10-26 18:00 UTC (771bbfc8cee56915e58dd2af86b57ae29da7bc45)

     0> 2022-10-26T18:37:53.979+0000 7f5dbc8376c0  -1 *** Caught signal (Segmentation fault) ** in thread 7f5dbc8376c0 thread_name:radosgw

 ceph version 3gw-20220804-71-g771bbfc8cee (771bbfc8cee56915e58dd2af86b57ae29da7bc45) quincy (dev)
 1: /lib64/libc.so.6(+0x3d910) [0x7f5e29ec9910]
 2: (rgw::sal::SFSAtomicWriter::complete(unsigned long, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::chrono::time_point<ceph::real_clock, std::chrono::duration<unsigned long, std::ratio<1l, 1000000000l> > >*, std::chrono::time_point<ceph::real_clock, std::chrono::duration<unsigned long, std::ratio<1l, 1000000000l> > >, std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, ceph::buffer::v15_2_0::list, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, ceph::buffer::v15_2_0::list> > >&, std::chrono::time_point<ceph::real_clock, std::chrono::duration<unsigned long, std::ratio<1l, 1000000000l> > >, char const*, char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const*, rgw_zone_set*, bool*, optional_yield)+0x5bb) [0x7f5e2cbb7d9b]
 3: (RGWPostObj::execute(optional_yield)+0x14a9) [0x7f5e2c6c1c09]
 4: (rgw_process_authenticated(RGWHandler_REST*, RGWOp*&, RGWRequest*, req_state*, optional_yield, rgw::sal::Store*, bool)+0xd0a) [0x7f5e2c23f79a]
 5: (process_request(rgw::sal::Store*, RGWREST*, RGWRequest*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, rgw::auth::StrategyRegistry const&, RGWRestfulIO*, OpsLogSink*, optional_yield, rgw::dmclock::Scheduler*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*, std::chrono::duration<unsigned long, std::ratio<1l, 1000000000l> >*, std::shared_ptr<RateLimiter>, int*, rgw::lua::Background*)+0x2414) [0x7f5e2c242554]
 6: /lib64/libradosgw.so.2(+0x8fe28c) [0x7f5e2c19828c]
 7: /lib64/libradosgw.so.2(+0x8fef37) [0x7f5e2c198f37]
 8: make_fcontext()
 NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this.