http://bugzilla.opensuse.org/show_bug.cgi?id=1198877
Bug ID: 1198877
Summary: Firefox with high CPU usage on network change event(?)
Classification: openSUSE
Product: openSUSE Tumbleweed
Version: Current
Hardware: x86-64
OS: Linux
Status: NEW
Severity: Normal
Priority: P5 - None
Component: Firefox
Assignee: factory-mozilla@lists.opensuse.org
Reporter: jengelh@inai.de
QA Contact: qa-bugs@suse.de
Found By: ---
Blocker: ---
After about 2 hours of firefox 99 running (was fine with earlier versions i.e.
98/etc.), the subthread known as "Netlink Monitor" in /proc/xxx/stat goes into
an infinite loop.
strace shows:
poll([{fd=22, events=POLLIN}, {fd=24, events=POLLIN}], 2, -1) = 1 ([{fd=24,
revents=POLLERR}])
poll([{fd=22, events=POLLIN}, {fd=24, events=POLLIN}], 2, -1) = 1 ([{fd=24,
revents=POLLERR}])
over and over again.
lsof:
firefox 30312 jengelh 22r FIFO 0,13 0t0 4037553
pipe
firefox 30312 jengelh 24u netlink 0t0 4041789
ROUTE
gdb:
(gdb) bt
#0 0x00007f5c92e8052f in poll () at /lib64/libc.so.6
#1 0x00007f5c88c8d68b in poll () at /usr/include/bits/poll2.h:39
#2 operator() () at
/usr/src/debug/MozillaFirefox-99.0.1-1.1.x86_64/netwerk/system/netlink/NetlinkService.cpp:1205
#3 eintr_retry > ()
at
/usr/src/debug/MozillaFirefox-99.0.1-1.1.x86_64/netwerk/system/netlink/NetlinkService.cpp:45
#4 mozilla::net::NetlinkService::Run() () at
/usr/src/debug/MozillaFirefox-99.0.1-1.1.x86_64/netwerk/system/netlink/NetlinkService.cpp:1203
#5 0x00007f5c8882b4a5 in nsThread::ProcessNextEvent(bool, bool*) () at
/usr/src/debug/MozillaFirefox-99.0.1-1.1.x86_64/xpcom/threads/nsThread.cpp:1167
#6 0x00007f5c888043d8 in NS_ProcessNextEvent(nsIThread*, bool) () at
/usr/src/debug/MozillaFirefox-99.0.1-1.1.x86_64/xpcom/threads/nsThreadUtils.cpp:467
#7 0x00007f5c88d5ae0d in
mozilla::ipc::MessagePumpForNonMainThreads::Run(base::MessagePump::Delegate*)
()
at
/usr/src/debug/MozillaFirefox-99.0.1-1.1.x86_64/ipc/glue/MessagePump.cpp:300
#8 0x00007f5c88d349b5 in MessageLoop::RunInternal() () at
/usr/src/debug/MozillaFirefox-99.0.1-1.1.x86_64/ipc/chromium/src/base/message_loop.cc:331
#9 MessageLoop::RunHandler() () at
/usr/src/debug/MozillaFirefox-99.0.1-1.1.x86_64/ipc/chromium/src/base/message_loop.cc:324
#10 MessageLoop::Run() () at
/usr/src/debug/MozillaFirefox-99.0.1-1.1.x86_64/ipc/chromium/src/base/message_loop.cc:306
#11 0x00007f5c888238c9 in nsThread::ThreadFunc(void*) () at
/usr/src/debug/MozillaFirefox-99.0.1-1.1.x86_64/xpcom/threads/nsThread.cpp:389
#12 0x00007f5c92c3e110 in () at /lib64/libnspr4.so
#13 0x000055b617ce67ea in set_alt_signal_stack_and_start(PthreadCreateParams*)
()
at
/usr/src/debug/MozillaFirefox-99.0.1-1.1.x86_64/toolkit/crashreporter/pthread_create_interposer/pthread_create_interposer.cpp:80
#14 0x00007f5c92e042ba in start_thread () at /lib64/libc.so.6
#15 0x00007f5c92e8e460 in clone3 () at /lib64/libc.so.6
code in question:
1193 while (!shutdown) {
1194 if (mOutgoingMessages.Length() &&
!mOutgoingMessages[0]->IsPending()) {
1195 if (!mOutgoingMessages[0]->Send(netlinkSocket)) {
1196 LOG(("Failed to send netlink message"));
1197 mOutgoingMessages.RemoveElementAt(0);
1198 // try to send another message if available before polling
1199 continue;
1200 }
1201 }
1202
1203 int rc = eintr_retry([&]() {
1204 AUTO_PROFILER_THREAD_SLEEP;
1205 return poll(fds, 2, GetPollWait());
1206 });
1207
1208 if (rc > 0) {
1209 if (fds[0].revents & POLLIN) {
1210 // shutdown, abort the loop!
1211 LOG(("thread shutdown received, dying...\n"));
1212 shutdown = true;
1213 } else if (fds[1].revents & POLLIN) {
1214 LOG(("netlink message received, handling it...\n"));
1215 OnNetlinkMessage(netlinkSocket);
1216 }
1217 } else if (rc < 0) {
1218 rv = NS_ERROR_FAILURE;
1219 break;
1220 }
1221 }
stepping and repetition pattern:
(gdb) n
1194 if (mOutgoingMessages.Length() &&
!mOutgoingMessages[0]->IsPending()) {
(gdb)
1203 int rc = eintr_retry([&]() {
(gdb)
1208 if (rc > 0) {
(gdb)
1209 if (fds[0].revents & POLLIN) {
(gdb)
1213 } else if (fds[1].revents & POLLIN) {
(gdb)
1194 if (mOutgoingMessages.Length() &&
!mOutgoingMessages[0]->IsPending()) {
As shown above by strace, there's a POLLERR condition on the netlink socket,
and FF fails to handle it.
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