Closed Bug 573078 Opened 9 years ago Closed 8 years ago
[Mac] OOM in ns
Html5Stream Parser::Write Stream Bytes [@ mozalloc _abort(char const*) ]
Seen while reviewing trunk crash stats. Now the #14 overall top crash on trunk and #1 top crash on Mac. http://tinyurl.com/25q7vnm links to all current crashes. It appears the crashes started on 6/11 and then spiked on 6/17. Not many URLs to go on as many of the crashes happened right after startup. I contacted on mozilla person who crashed and he said he had no idea how it happened.
Frame Module Signature [Expand] Source 0 libmozalloc.dylib mozalloc_abort memory/mozalloc/mozalloc_abort.cpp:64 1 libmozalloc.dylib mozalloc_handle_oom memory/mozalloc/mozalloc_oom.cpp:54 2 libmozalloc.dylib libmozalloc.dylib@0xcc0 3 XUL XUL@0x62bad6 4 XUL nsHtml5StreamParser::WriteStreamBytes parser/html/nsHtml5StreamParser.cpp:513 5 XUL nsHtml5StreamParser::DoDataAvailable parser/html/nsHtml5StreamParser.cpp:665 6 XUL nsHtml5DataAvailable::Run parser/html/nsHtml5StreamParser.cpp:705 7 XUL nsThread::ProcessNextEvent xpcom/threads/nsThread.cpp:547 8 XUL NS_ProcessNextEvent_P nsThreadUtils.cpp:250 9 XUL nsThread::ThreadFunc xpcom/threads/nsThread.cpp:263 10 libnspr4.dylib _pt_root nsprpub/pr/src/pthreads/ptthread.c:228 11 libSystem.B.dylib _pthread_start 12 libSystem.B.dylib thread_start
Approaching the 500 crash mark, which is a high for a Mac nightly. http://tinyurl.com/2fasce3 links to the crashes, which are mostly startup crashes. Comments mention: trying to start minefield while firefox is running I'm just trying to start up. https://crash-stats.mozilla.com/report/index/280ac94b-a672-4af2-b526-6ce992100622 is interesting in that a line in that stack indicates: _ZL20ProfileMissingDialogP19nsINativeAppSupport
These crashes don't show up when you filter on the "1.9.3 branch" -- as I've been used to doing for the last few months. So I completely missed them. Wierd!
They appear to all be null dereferences at: http://hg.mozilla.org/mozilla-central/annotate/431eab8cf6ab/memory/mozalloc/mozalloc_abort.cpp#l64
I don't know how to categorize this bug report.
OS: Mac OS X → All
Hardware: x86 → All
This stack from comment 1 signifies OOM in the HTML5 parser. If that stack starts moving up the topcrash leaderboard, the allocating code here needs to switch to explicitly fallible allocation.
Component: General → HTML: Parser
QA Contact: general → parser
Actually, these *are* Mac-specific. I've seen reports for OS X 10.5.8 and various versions of 10.6.X.
OS: All → Mac OS X
The number of these crashes over the last two weeks (460) is truly dramatic. The next legitimate entry in the Mac topcrasher list (js_UnboxDouble(long)) has only 8 crashes! (The crashes at nsCrasher::Crash(short) are in the "crashme" testing extension.) http://crash-stats.mozilla.com/query/query?product=Firefox&version=Firefox%3A3.7a6pre&platform=mac&range_value=2&range_unit=weeks&date=06%2F23%2F2010+12%3A52%3A43&query_search=signature&query_type=exact&query=&build_id=&process_type=any&hang_type=any&do_query=1
Fortunately A5 (based on the 2010-06-10 nightly) doesn't have any of these crashes.
From a random sampling of the reports in comment 8, it appears to me that the majority are 0 libmozalloc.dylib mozalloc_abort memory/mozalloc/mozalloc_abort.cpp:64 1 XUL NS_DebugBreak_P xpcom/base/nsDebugImpl.cpp:379 2 XUL XUL@0xc8185c 3 XUL base::ThreadLocalPlatform::SetValueInSlot ipc/chromium/src/base/logging.h:61 4 XUL XUL@0xc83000 5 XUL NS_InitXPCOM3_P ipc/chromium/src/base/message_loop.h:434 6 XUL ScopedXPCOMStartup::Initialize toolkit/xre/nsAppRunner.cpp:1145 7 XUL ProfileMissingDialog toolkit/xre/nsAppRunner.cpp:1901 8 XUL XRE_main toolkit/xre/nsAppRunner.cpp:3264 9 firefox-bin main browser/app/nsBrowserApp.cpp:158 10 firefox-bin firefox-bin@0xbf5 11 @0x1 I did see some crashes in the HTML5 parser that looked the same as comment 1, so I suggest we morph this bug into the OOM tracker and spin off a new bug for the startup problem. (The OOM shouldn't be mac-specific, but one never knows ...)
Summary: [Mac] Crash in [@ mozalloc_abort(char const*) ] → [Mac] OOM in nsHtml5StreamParser::WriteStreamBytes [@ mozalloc_abort(char const*) ]
Spun off initialization problem into bug 574139.
(In reply to comment #1) > Frame Module Signature [Expand] Source > 0 libmozalloc.dylib mozalloc_abort > memory/mozalloc/mozalloc_abort.cpp:64 > 1 libmozalloc.dylib mozalloc_handle_oom > memory/mozalloc/mozalloc_oom.cpp:54 > 2 libmozalloc.dylib libmozalloc.dylib@0xcc0 > 3 XUL XUL@0x62bad6 I'm guessing stack frame #3 has to be the constructor for nsHtml5UTF16Buffer. I wonder why there's no symbol. > 4 XUL nsHtml5StreamParser::WriteStreamBytes > parser/html/nsHtml5StreamParser.cpp:513 Assuming that stack frame #3 is the constructor for nsHtml5UTF16Buffer, this crash is a case where the HTML5 parser allocates 1 KB at a time. Does the infallible malloc already have a mechanism for freeing stuff (killing tabs?) when it runs low on memory? If it does, is 1 KB too much to allocate at a time for the mechanism to work? If I made the HTML5 parser return NS_ERROR_OUT_OF_MEMORY to the event loop of the parser thread, what would happen? If the next buffer were pushed to the parser nonetheless and it happened to succeed, a piece of the page would be missing, which could change the executability properties of pieces of the page.
(In reply to comment #12) > Does the > infallible malloc already have a mechanism for freeing stuff (killing tabs?) > when it runs low on memory? Apparently not: http://mxr-test.konigsberg.mozilla.org/mozilla-central/source/memory/mozalloc/mozalloc_oom.cpp#49 :-(
What to do here really depends on whether the infallible malloc becomes able to stop active parsers or (failing that) zap existing tabs/windows to free memory.
Priority: -- → P3
We're not going to have tabs in their own process(es) until FF 5. That gives us more OOM-handling options. Until then, this allocation site should be made fallible and (probably) bail on OOM. (In reply to comment #12) > If I made the HTML5 parser return NS_ERROR_OUT_OF_MEMORY to the event loop of > the parser thread, what would happen? If the next buffer were pushed to the > parser nonetheless and it happened to succeed, a piece of the page would be > missing, which could change the executability properties of pieces of the page. I can't answer that question, but it'd be easy enough to simulate an OOM here and find out.
(In reply to comment #15) > We're not going to have tabs in their own process(es) until FF 5. That gives > us more OOM-handling options. Until then, this allocation site should be made > fallible and (probably) bail on OOM. OK. :-( > (In reply to comment #12) > > If I made the HTML5 parser return NS_ERROR_OUT_OF_MEMORY to the event loop of > > the parser thread, what would happen? If the next buffer were pushed to the > > parser nonetheless and it happened to succeed, a piece of the page would be > > missing, which could change the executability properties of pieces of the page. > > I can't answer that question, but it'd be easy enough to simulate an OOM here > and find out. It seems to me that if this allocation fails, the parser needs to be flagged broken and subsequent buffer should be ignored, too, for security reasons.
Priority: P3 → P2
Safe (as in not allowing arbitrary code execution) OOM crashes in the parser are now lower priority than Web-facing correctness fixes.
Priority: P2 → P4
Crash Signature: [@ mozalloc_abort(char const*) ]
Target Milestone: --- → mozilla10
Assignee: nobody → hsivonen
Status: NEW → ASSIGNED
Status: ASSIGNED → RESOLVED
Closed: 8 years ago
Resolution: --- → FIXED
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