I've also tried to find all calls to nsIDNSService::Resolve() and it seems that only nsProxyAutoConfig can cause UI freeze due to DNS.IMPORTANT: As of Firefox 21, there are two locations for default preferences, defaults/pref and browser/defaults/preferences. Wpad.dat with dnsResolve() : freezes UI for the duration of call to dnsResolve() Wpad.dat with dnsResolve() : freezes UI for few seconds Wpad domain exists but no wpad.dat file present : OK DNS inaccessible : freezes UI for the duration of call to dnsResolve() DNS dropping some packets : freezes UI for the duration of call to dnsResolve() Fully working DNS : freezes UI for few seconds Used local PAC file and FindProxyForURL() uses dnsResolve(). Request is sent to proxy without resolving. DNS dropping some packets (resolving takes long time) : OK OK means that UI didn't freeze even if request took long time to fail.ġ) No proxy (mentioned in comment #8 as problematic too) I've tried accessing nonexistent domain in following scenarios. UI freezes only in case when hostname is resolved in PAC file (i.e. #11 in js_Invoke () from /usr/lib64/mozilla-firefox/libmozjs.so
#10 in js_FreeStack () from /usr/lib64/mozilla-firefox/libmozjs.so #9 in js_Invoke () from /usr/lib64/mozilla-firefox/libmozjs.so #8 in nsSupportsArray::AppendElement () from /usr/lib64/mozilla-firefox/components/libxpconnect.so #7 in nsSupportsArray::AppendElement () from /usr/lib64/mozilla-firefox/components/libxpconnect.so #6 in XPTC_InvokeByIndex () from /usr/lib64/mozilla-firefox/libxpcom_core.so #5 in CopyUCS2toASCII () from /usr/lib64/mozilla-firefox/components/libnecko.so #4 in PR_Wait () from /usr/lib64/nspr/libnspr4.so.6 #3 in PR_WaitCondVar () from /usr/lib64/nspr/libnspr4.so.6 #1 in _pthread_wait_for_restart_signal () from /lib/libpthread.so.0 #0 in _pthread_sigsuspend () from /lib/libpthread.so.0 #12 in pthread_start_thread () from /lib/libpthread.so.0 #11 in PR_Select () from /usr/lib64/nspr/libnspr4.so.6 #10 in CopyUCS2toASCII () from /usr/lib64/mozilla-firefox/components/libnecko.so #9 in PR_GetAddrInfoByName () from /usr/lib64/nspr/libnspr4.so.6 #7 in sched_setaffinity () from /lib/libc.so.6 #6 in _nss_dns_gethostbyname2_r () from /lib/libnss_dns.so.2 #5 in _nss_dns_gethostbyname3_r () from /lib/libnss_dns.so.2 #4 in _libc_res_nsearch () from /lib/libresolv.so.2 #3 in _res_nquery () from /lib/libresolv.so.2 #2 in _libc_res_nquery () from /lib/libresolv.so.2 #1 in _res_queriesmatch () from /lib/libresolv.so.2 When the message "server not found" appears, everything is working back again. When an host is not resolvable, firefox hangs completely. When opening multiple tabs (for instance after a google search), Stack traces of firefox frozen by dns unresolvable domain May be related to bug #274506 - Cannot Stop a DNS lookup. Programs during the DNS look up period, or allow me to cancel the request.
Once proxy returns error the system is back to normalįirefox should not lockup the system and should allow me to switch to other Firefox locks up the system, you are unable to activate Thunderbird.Ģ. Visit a not existant domain (for example 5. Set firefox to use a proxy server (tested with Squid running on FreeBSD)Ĥ. Open some other Application (for example Thunderbird)ģ. It is not until the proxy server returns the error that I am able to continueĢ. The computer has not completly locked up, but only certianĪpplication (for example Thunderbird) will not respond in addition to Firefox. I am unable to switch to SOME other running programs, click the Me submiting the address and the proxy server returning the error, Firefox locks I attempt to visit a non-existantĭomain that will bring up a DNS error on the proxy server.
#Firefox lock proxy settings mac windows
User-Agent: Mozilla/5.0 (Windows U Windows NT 5.0 en-US rv:1.7.5) Gecko/20041107 Harrison Conference Center at Glen Cove/1.0īuild Identifier: Mozilla/5.0 (Windows U Windows NT 5.0 en-US rv:1.7.5) Gecko/20041107 Harrison Conference Center at Glen Cove/1.0įirefox is setup to use a Squid proxy server.
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