This is the compilation failure metabug. If your bugreport was marked a duplicate of this one, it means the gentoo developers consider your problem to be local to your setup. Look below for symptoms, causes and possible cures. The compilation failure that cause a bug to be marked duplicate of this one can be one of the following: - internal compiler errors or gcc segfaults. These are caused by gcc. We are sorry, but we cannot do anything about those. - Random segfaults during compilation. These are signalled by compilation failing at undetermined points. Often trying to recompile will succesfully compile the file it was complaining about, but will fail for another. This is in general a sign of hardware problems. - Segfaults in auxiliary tools used in the compilation process. Some merges fail on segmentation faults in auxiliary tools. When those tools are stable themselves (bugs with the tools themselves should not be marked duplicate of this bug) the causes are often the same as for gcc problems. There are multiple causes that can cause the above symptoms: - Flaky hardware. This is showstopper number one. The cause can be either: - Insufficient power supply. To detect this try to unplug as many auxiliary devices (like cd-players, usb devices, etc.) as possible and see whether the problem persists - Overclocked memory or CPU's can show random anomalous behaviour. Worse some hardware has these problems even at "factory speed". Lowering the clockspeed would be the solution to this problems - Overheated CPU's. CPU's have several calculation units which have a specific location on the chip. Compilation tends to intensively use a few of those units. This can cause heat problems within these units even when the overall chip temperature is within limits. If overheating is a problem a better cpu cooler often works. (Underclocking also works as heat increases with frequency) - Broken chipsets. There are some chipsets on motherboards which are broken. sometimes the os (read linux kernel) can work around some of these bugs, sometimes the only solution is a new motherboard. - Overagressive compilation flags. There are many possible combinations of compilation flags. Some of them are problematic with some software by design, others contain bugs that are triggered by certain sources. In general the higher the optimization the more likely it is to hit a bug. If things work with CFLAGS="-O2 -mcpu=<yourcpu>" then this is your problem. Of particular note here is that there still are bugs in gcc-3.2.2's code generation with -march=pentium4. (If you have a pentium4 try to compile with CFLAGS="-march=pentium3 -mcpu=pentium4, if things work then, report it as in that case we can automatically filter -march=pentium4 for the package involved) - Instable kernel. There is no guaranty for stability of the many kernels gentoo offers. Trying to use the vanilla kernel with conservative options can show whether you've hit a kernel bug. Especially kernel-preemption and low latency can cause problems with certain combinations of options (esp. hardware drivers) Compilation flags should work. If you find a certain compilation flag that doesn't work, look it up in the gcc manual (info gcc) and read whether it is concidered safe to use in this case. In case it is considered safe you might file a bug with the gcc developers.
Mark the bug as CANTFIX as we cannot resolve these problems. Additional comments, suggestions, possible causes and possible solutions are welcome as comments.
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Old Bug, should be marked. CANTFIX.
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It can be fault of dirty hardware. It can be I think also a problem of raised voltage from power station. Normally in Poland there was 220 V and now it is 230. The power supply in computer (in Poland of course) is designed to take 220V. I thing higher volatage can rise the speed of linear rising of the signal in CPU clock and make the CPU frequency faster, then (cause the processor is running in funny frequency) hazards can occur (as said below). Good resolve should be a voltage converter. And fuck up the Polish politics for changing the Voltage only for buying the power from Western Europe (we have enough power stations).
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The time showed that my motherboard was broken.
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As an additional note to this bug, some packages exhibit these problems significently more often than others. The compile of MySQL-4* really stresses the hardware, and in particular two files in it are much worse than others: sql_yacc.*, item_sum.* The former is a very large and complex file generated from yacc source data, and both of them put the optimization in GCC to it's fully potential. I've seen machines that pass memtest86, cpuburn and every other test I can throw at them, but fail if anything more than -O0 is used for compiling sql_yacc.o.
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I discovered the cause of this problem for me. The computer case sits on the floor with the cover off. Upon inspection the HSF was clogged with dust and the thermal compound had pretty much disappeared from between the HSF and the CPU. Cleaned the dust out and re-thermal compounded the HSF/CPU and everything has been fine ever since. Not that this is an OLD K6/500 box that has been in operation for at least 5 years now.
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I had many problems with Intel machines beginning from Pentium 3 800Mhz ending at Pentium 75. Some compilations never succeded, especcialy >=gcc-3.3.1. My AMD processors done it fine (Duron 1600, even AMD K6-2 300), I thought it was somenthing from Intel. But then I discovered both AMD's had at least 192MB of RAM. It was it, when I put some spap to my Pentium 75 (overclocked for 133) machine wich has 64MB of RAM, to make his operational memory over 192MB he compiled everything I wanted (even faster that I though it should). Pentium 3 have had only 128MB and I never could succesfully acomplish bootstrap.sh or emerge system (when starting from stage2). I hadn't have the possibility of checking if giving more RAM will work, case the motherboard started to hang very often and when I was trying to clean the dust from it, I scratched the processors surface. but I thing it could work. (I think that corruption of motherboard was fault of voltage rise from 220V to 230V in Poland, when central and eastern european countries joined Europe Union) So check if you have enough memory to end the compilation. Another thing is that, that CFLAGS and CXXFLAGS are weakly described in manual. I proposing to use: "-Os or -O2" for machines with small cache (under 128kb) "-O2" for machines with cache about 256kb "-O3" for machines with big cache - 512kb and more. CFLAGS should be: "-march=<machine> -pipe -Wall -s -fomit-frame-pointer" CXXFLAGS should be: "-march=<machine> -pipe -Wall -s -fno-rtti -fexceptions" doing bootstrap.sh and emerge system processes. When db4 will be compiled one can change "-fexceptions" to "-fno-exceptions" I heard the code is then faster, but I din't saw the difference so I'm using -fexceptions, case there was no ebuild that wanten from me no-exceptions. I See how it works and you will know if it is good for you to change or not to change -fexceptions flag. When someting isn't compilling corectly sometimes -mpcu=<machine> flag will help (for example Flight Gear Flight Simulator doesn't still compile on march) and sometimes you should disable -fno-rtti but bigger part of ebuilds will compile. And last thing. When using -march put names of your special instructions in USE flags, for example - when using -march=athlon-xp put: USE="[...] mmx mmx2 3dnow 3dnowex 3dnow2 sse" then ebuild will know what should they compile in binary. Thats all for now.
Please please, do not use "-fno-rtti -fexceptions" Both these flags are application specific. They turn of standard c++ features. THIS WILL ONLY WORK if the application in question does not use those features. Applications that use them (i.e. use c++ as it is supposed to be used) will fail in all kinds of strange ways. Never do this globally, and only locally if you are the author of the software. btw. If your motherboard gets corrupted because of the voltage switch this can only mean one thing: A power supply that is at or over the edge of it's operating parameters. The 10 volt diference is within the normal tollerance of power supplies. If however the power demand is allready higher than it can handle, things can break. Please remember in this that overclocking means you also use more power.
I overclocked the Pentium processor, Pentium 3 was untouched. I thought it is a fault of higher voltage case condensators on the motherboard were bulbed. About flags: I'm using them both, most of sotfware compiles, maybe "-fno-rtti" isn't needed, but db4 will compile only with "-fexceptions" turned on, of course. When I was writing that comment I forgot, you can change the settings localy for selected package in /etc/portage/package.use, sorry for that. Maybe this should be done automatically somewhere - to make the boostrap.sh and emerge system processes easier?
You can't cflags in /etc/portage/package.use, only through hacks in /etc/portage/bashrc. But they are NOT SAFE IN ANY CASE and not recommended. About the power supply. Your motherboard does not run on 220/230 volts, but on a lower voltage (I believe, but don't pin me on it 12 volts). Depending on your power supply this is a clean dc current with little variance at 12 volts, or a less than clean supply around 12 volts. Good power converters have electronic circuits that stabilize the voltage. That makes them able to cope with the change in voltage between 220/230. Most power supplies are even designed for multiple voltages to make export easier. (My printer has a power supply that can handle input ranges from 110 volts to 230)
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I run the ASUS 266-D with dual AMD MP 2800s and by default they run ~2ghz on 266mhz bus. Until reading this post, gcc was segfaulting inconsistently durring build. I then rebooted, went to my bios and dropped cpu speed to ~1.6ghz, gcc then built flawlessly.
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I think there are two things mixed in this bug which shouldn't be mixed: It is probably true that things like "internal error: Segmentation fault" or other illegal instructions are due to flaky hardware/bad memory/overclocking/heat problems etc. However, the other thing also included in this bug is the systematic filling of memory which eventually ends in "internal error: killed" - it is hard to imagine that a hardware problem can cause the kernel or some basic library to consider memory as reserved, and, moreover, to do this rather reproducible and without *ever* hitting some illegal instruction or exhibiting some other strange behaviour (and moreover, doing this same thing in x86 and amd64 modes and independent of temperature/clock rate and the compilation flags of the used kernel/gcc/other libraries (and with kernels/kernel configurations)). This sounds to me much more like a *software* bug in the kernel or gcc or some basic library which apparently (for some unknown reason) only shows up in some architectures. Unfortunately, I am running out of ideas of how to locate this bug. Any hints are appreciated (or also an explanation why this might be a hardware problem anyway).
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removed me from CC
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remove me from cc
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Remove me from CC list.
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Runnning out of resources is another think which can cause this. Things to check: -Sufficent free memory This can be calculated by the root directory of the program times about 3. -File descriptors Just make sure you don't have over 500-600 files being written to or read from
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Other possible case: out of memory. My swap was broken and the compilation ran out of memory (128MB RAM). Swap fixed, problem solved. Good luck to all.
(In reply to comment #173) > Other possible case: out of memory. My swap was broken and the compilation ran out of memory (128MB RAM). Swap fixed, problem solved. Good luck to all. Yeah, that's true.. Btw, - Random segfaults during compilation. These are signalled by compilation failing at undetermined points. Often trying to recompile will succesfully compile the file it was complaining about, but will fail for another. This is in general a sign of hardware problems. // No, this is in general a sign of GCC 4.1 - problem ;-)
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(In reply to comment #1) > Mark the bug as CANTFIX as we cannot resolve these problems. Additional > comments, suggestions, possible causes and possible solutions are welcome as > comments. > it has compiled now for me with any "use flag" and with -march=pentium4 instead of -march=prescott =)
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> Bug 142272 has been marked as a duplicate of this bug Upgrading my RAM from 128MB to 512MB fixed this problem.
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The UK used to be 240, we stepped down to 230... All computers I know of run on DC (12V , 5V etc) which is why you need a PSU, sounds like yours needs replacing :-) (In reply to comment #29) > It can be fault of dirty hardware. It can be I think also a problem of raised > voltage from power station. Normally in Poland there was 220 V and now it is > 230. The power supply in computer (in Poland of course) is designed to take > 220V. I thing higher volatage can rise the speed of linear rising of the signal > in CPU clock and make the CPU frequency faster, then (cause the processor is > running in funny frequency) hazards can occur (as said below). Good resolve > should be a voltage converter. And fuck up the Polish politics for changing the > Voltage only for buying the power from Western Europe (we have enough power > stations). >
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I've managed to work around this by replacing my compilers with scripts that call the real compilers and then call them a second time in the event of a failure. I also added a "sleep $DELAY" as well so that I can emerge things with "DELAY=3 emerge whatever" to give the CPU a few seconds to rest between each execution of GCC. I also tried simply a 90 second delay before the second attempt at compiling, but that proved problematic as it seems configure scripts attempt to compile a lot of stuff that is expected to fail.
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My 2 cents contrib about the power supply issue. As Paul said above, 230V is inside the tolerance of a 220V power supply (typically +10 -15%, the same tolerance as the power line). Things can go wrong if the power get to 230V + 15%. It will be outside the tolerance of the power supply. But I have never seen this to append. Most (all?) of the time, the power line will be somewhere between 230V and 230V -15%. Another issue is money. It cost money to make a power supply, and for the same amount of manufactured power supplies, it will be cheaper to make one model for 220-230V (or 220-240V), as one model for 220V and another one for 230V. And most power supply are very cheap today. That bring the last problem: quality. A cheap power supply (or whatever cheap electronic) will always be made with cheap components. The number one problem in the power supply is the electrolytic capacitors. They are aging very fast, and cheaper they are, faster their characteristics are decreasing. I will not go into technical details, but a computer power supply is all about charging and decharging very fast such capacitors. They are doing the hardest work in the supply. Siemens, one of the best electrolytic manufacturer, is manufacturing many different qualities of those components. At different prices of course. For their best quality, they state at such a component must be changed in any case after ten years of work if we want to be sure of its characteristic. No testing, just to change it! We can not expect at we will get the same lifetime from the same component coming from one at least 20 time less expensive brand. (Don't buy old electrolytic capacitors, they are becoming dry when they do nothing. And the dry electrolytic will not like at all when you will plug the power in. Siemens state about half lifetime after one year of non activity for its best quality.)
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I've upgraded my RAM from 64M to 192M and increased swap space from 128M to 1G, now everything works fine. Thanks Jakub!
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Today I started undervolting my pentium m cpu. When I tried to compile firefox gcc segfaulted, tried again, gcc segfaulted again. Now I raised all my voltages (the lower ones) with about 32 mV and firefox is compiling again. Summary: an undervolted cpu can seem to run fine but you're never sure until you run into problems.
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Was having segfault issue on my fileserver today. Turned out my CMOS had gotten cleared yesterday, fixed the issue by setting my memory timings to the most aggressive my motherboard would support. Go figure
*** Bug 259662 has been marked as a duplicate of this bug. ***
*** Bug 199033 has been marked as a duplicate of this bug. ***
(In reply to comment #29) > It can be fault of dirty hardware. It can be I think also a problem of raised > voltage from power station. Normally in Poland there was 220 V and now it is > 230. The power supply in computer (in Poland of course) is designed to take > 220V. It is due to unifying voltage/frequency in whole EU, don't blame politicans. > Good resolve should be a voltage converter. You should use devices which comply some standarts and not devices build "on knees". I live in CZ near borders with PL and I had bad experiences with (cheap) broadband TV antennas from Poland.
£Another issue with the power line is the phase between the voltage and the current (called power factor or charge factor). Normally, the dephasing must be equal to 0, but in practice, you will get almost always a little dephasing. If you are living at the country or in a place where the line have a very long distance, or you are using a lot of cheap extension cords, you can get a dephasing that will be outside the tolerance. If it is the case, no one single manufacturer will give you a guaranty that its devices will or can work fine. For a general discussion one this issue on power lines, see http://en.wikipedia.org/wiki/Power_factor
*** Bug 263624 has been marked as a duplicate of this bug. ***
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A question. Now the rt-sources is in portage. Does that mean it will not trigger compilation failures? Or is it still necessary/better to use the a vanilla or gentoo-sources kernel with emerge?
*** Bug 914368 has been marked as a duplicate of this bug. ***
