lanki567 commented on issue #1662: Mod_pagespeed deadlock? URL: https://github.com/apache/incubator-pagespeed-ngx/issues/1662#issuecomment-537963143 Below is the stacktrace of 2 threads with the Release module compiled from latest stable build branch. We see 100's of threads with the below stacktrace `Thread 24 (Thread 0x7f3c425d6700 (LWP 12478)): #0 0x00007f3da8e984ed in __lll_lock_wait () from /lib64/libpthread.so.0 #1 0x00007f3da8e93dcb in _L_lock_883 () from /lib64/libpthread.so.0 #2 0x00007f3da8e93c98 in pthread_mutex_lock () from /lib64/libpthread.so.0 #3 0x00007f3d98e11afb in net_instaweb::SharedMemCache<64ul>::Get(std::string const&, net_instaweb::CacheInterface::Callback*) () from /apache/config/modules/mod_pagespeed_ap24.so #4 0x00007f3d98e05977 in net_instaweb::CacheStats::Get(std::string const&, net_instaweb::CacheInterface::Callback*) () from /apache/config/modules/mod_pagespeed_ap24.so #5 0x00007f3d98e05977 in net_instaweb::CacheStats::Get(std::string const&, net_instaweb::CacheInterface::Callback*) () from /apache/config/modules/mod_pagespeed_ap24.so #6 0x00007f3d98bb1888 in net_instaweb::CachePropertyStore::Get(std::string const&, std::string const&, std::string const&, std::vector<net_instaweb::PropertyCache::Cohort const*, std::allocator<net_instaweb::PropertyCache::Cohort const*> > const&, net_instaweb::PropertyPage*, net_instaweb::Callback1<bool>*, net_instaweb::AbstractPropertyStoreGetCallback**) () from /apache/config/modules/mod_pagespeed_ap24.so #7 0x00007f3d98bb53b4 in net_instaweb::PropertyPage::Read(std::vector<net_instaweb::PropertyCache::Cohort const*, std::allocator<net_instaweb::PropertyCache::Cohort const*> > const&) () from /apache/config/modules/mod_pagespeed_ap24.so #8 0x00007f3d989e0606 in net_instaweb::InstawebContext::BlockingPropertyCacheLookup() () from /apache/config/modules/mod_pagespeed_ap24.so #9 0x00007f3d989e0eb5 in net_instaweb::InstawebContext::InstawebContext(request_rec*, net_instaweb::RequestHeaders*, net_instaweb::ContentType const&, net_instaweb::ApacheServerContext*, std::string const&, net_instaweb::RefCountedPtr<net_instaweb::RequestContext> const&, net_instaweb::QueryParams const&, net_instaweb::QueryParams const&, bool, net_instaweb::RewriteOptions const&) () from /apache/config/modules/mod_pagespeed_ap24.so #10 0x00007f3d989e8169 in net_instaweb::(anonymous namespace)::build_context_for_request(request_rec*) () from /apache/config/modules/mod_pagespeed_ap24.so #11 0x00007f3d989e8755 in net_instaweb::(anonymous namespace)::instaweb_out_filter(ap_filter_t*, apr_bucket_brigade*) () from /apache/config/modules/mod_pagespeed_ap24.so #12 0x00007f3da7e77194 in filter_harness (f=0x7f3bf8071fa0, bb=0x7f3bf80723a0) at mod_filter.c:323 #13 0x00000000004421f7 in default_handler (r=0x7f3bf8078020) at core.c:4836 #14 0x0000000000453960 in ap_run_handler (r=r@entry=0x7f3bf8078020) at config.c:170 #15 0x0000000000453ea9 in ap_invoke_handler (r=r@entry=0x7f3bf8078020) at config.c:444 #16 0x00000000004697ba in ap_process_async_request (r=0x7f3bf8078020) at http_request.c:453 #17 0x0000000000469a7e in ap_process_request (r=r@entry=0x7f3bf8078020) at http_request.c:488 #18 0x0000000000465c45 in ap_process_http_sync_connection (c=0x7f3c3005b2c8) at http_core.c:210 #19 ap_process_http_connection (c=0x7f3c3005b2c8) at http_core.c:251 #20 0x000000000045d480 in ap_run_process_connection (c=c@entry=0x7f3c3005b2c8) at connection.c:42 #21 0x000000000045d9a8 in ap_process_connection (c=c@entry=0x7f3c3005b2c8, csd=csd@entry=0x7f3c3005b0b0) at connection.c:219 #22 0x00000000004706f2 in process_socket (bucket_alloc=0x7f3bf806aa08, my_thread_num=44, my_child_num=3, sock=0x7f3c3005b0b0, p=0x7f3c3005b038, thd=0xc47928) at worker.c:479 #23 worker_thread (thd=0xc47928, dummy=<optimized out>) at worker.c:808 #24 0x00007f3da8e91dd5 in start_thread () from /lib64/libpthread.so.0 #25 0x00007f3da89b702d in clone () from /lib64/libc.so.6 Thread 25 (Thread 0x7f3c42fd7700 (LWP 12477)): #0 0x00007f3da8e984ed in __lll_lock_wait () from /lib64/libpthread.so.0 #1 0x00007f3da8e93dcb in _L_lock_883 () from /lib64/libpthread.so.0 #2 0x00007f3da8e93c98 in pthread_mutex_lock () from /lib64/libpthread.so.0 #3 0x00007f3d98e11afb in net_instaweb::SharedMemCache<64ul>::Get(std::string const&, net_instaweb::CacheInterface::Callback*) () from /apache/config/modules/mod_pagespeed_ap24.so #4 0x00007f3d98e05977 in net_instaweb::CacheStats::Get(std::string const&, net_instaweb::CacheInterface::Callback*) () from /apache/config/modules/mod_pagespeed_ap24.so #5 0x00007f3d98e05977 in net_instaweb::CacheStats::Get(std::string const&, net_instaweb::CacheInterface::Callback*) () from /apache/config/modules/mod_pagespeed_ap24.so #6 0x00007f3d98bb1888 in net_instaweb::CachePropertyStore::Get(std::string const&, std::string const&, std::string const&, std::vector<net_instaweb::PropertyCache::Cohort const*, std::allocator<net_instaweb::PropertyCache::Cohort const*> > const&, net_instaweb::PropertyPage*, net_instaweb::Callback1<bool>*, net_instaweb::AbstractPropertyStoreGetCallback**) () from /apache/config/modules/mod_pagespeed_ap24.so #7 0x00007f3d98bb53b4 in net_instaweb::PropertyPage::Read(std::vector<net_instaweb::PropertyCache::Cohort const*, std::allocator<net_instaweb::PropertyCache::Cohort const*> > const&) () from /apache/config/modules/mod_pagespeed_ap24.so #8 0x00007f3d989e0606 in net_instaweb::InstawebContext::BlockingPropertyCacheLookup() () from /apache/config/modules/mod_pagespeed_ap24.so #9 0x00007f3d989e0eb5 in net_instaweb::InstawebContext::InstawebContext(request_rec*, net_instaweb::RequestHeaders*, net_instaweb::ContentType const&, net_instaweb::ApacheServerContext*, std::string const&, net_instaweb::RefCountedPtr<net_instaweb::RequestContext> const&, net_instaweb::QueryParams const&, net_instaweb::QueryParams const&, bool, net_instaweb::RewriteOptions const&) () from /apache/config/modules/mod_pagespeed_ap24.so #10 0x00007f3d989e8169 in net_instaweb::(anonymous namespace)::build_context_for_request(request_rec*) () from /apache/config/modules/mod_pagespeed_ap24.so #11 0x00007f3d989e8755 in net_instaweb::(anonymous namespace)::instaweb_out_filter(ap_filter_t*, apr_bucket_brigade*) () from /apache/config/modules/mod_pagespeed_ap24.so #12 0x00007f3da7e77194 in filter_harness (f=0x7f3bec071f88, bb=0x7f3bec072388) at mod_filter.c:323 #13 0x00000000004421f7 in default_handler (r=0x7f3bec078020) at core.c:4836 #14 0x0000000000453960 in ap_run_handler (r=r@entry=0x7f3bec078020) at config.c:170 #15 0x0000000000453ea9 in ap_invoke_handler (r=r@entry=0x7f3bec078020) at config.c:444 #16 0x00000000004697ba in ap_process_async_request (r=0x7f3bec078020) at http_request.c:453 #17 0x0000000000469a7e in ap_process_request (r=r@entry=0x7f3bec078020) at http_request.c:488 #18 0x0000000000465c45 in ap_process_http_sync_connection (c=0x7f3c300591e8) at http_core.c:210 #19 ap_process_http_connection (c=0x7f3c300591e8) at http_core.c:251 #20 0x000000000045d480 in ap_run_process_connection (c=c@entry=0x7f3c300591e8) at connection.c:42 #21 0x000000000045d9a8 in ap_process_connection (c=c@entry=0x7f3c300591e8, csd=csd@entry=0x7f3c30058fd0) at connection.c:219 #22 0x00000000004706f2 in process_socket (bucket_alloc=0x7f3bec06aa08, my_thread_num=43, my_child_num=3, sock=0x7f3c30058fd0, p=0x7f3c30058f58, thd=0xc478f8) at worker.c:479 #23 worker_thread (thd=0xc478f8, dummy=<optimized out>) at worker.c:808 #24 0x00007f3da8e91dd5 in start_thread () from /lib64/libpthread.so.0 #25 0x00007f3da89b702d in clone () from /lib64/libc.so.6`
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