Date: Thu, 6 Nov 2025 15:45:01 +0100 (CET) From: Ronald Klop <ronald-lists@klop.ws> To: bob prohaska <fbsd@www.zefox.net> Cc: freebsd-current@freebsd.org, freebsd-arm@freebsd.org Subject: Re: Arm v7 RPi2 -current unresponsive to debugger escape during buildworld Message-ID: <475995705.6919.1762440301455@localhost> In-Reply-To: <aQyrBArxXq-JSaqu@www.zefox.net>
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[-- Attachment #1 --] Hi, To me it sounds like your machine is overwhelmed by swapping. Try -j1 buildworld. Regards, Ronald. Van: bob prohaska <fbsd@www.zefox.net> Datum: donderdag, 6 november 2025 15:04 Aan: freebsd-arm@freebsd.org CC: freebsd-current@freebsd.org Onderwerp: Arm v7 RPi2 -current unresponsive to debugger escape during buildworld > > For roughly the past year I've been seeing buildworld become unresponsive > compiling -current on a Pi2 (armv7). The stoppages seem random, sometimes > with no visible memory pressure, other times while swapping. The machine > uses a USB mechanican hard drive for root and swap. > > Numerous attemps to use enter-tilda-control-B to get into the debugger > have failed, with absolutely no response. In the most recent case the > disk activity light was flashing rapidly, a relatively uncommon event. > The frozen top window showed ~312 MB swap in use, less than half of > the maximum commonly seen for a -j3 buildworld. > > Looking at the log file after power-cycling it appeared to have last > updated the previous evening, so it seems unlikely it got stuck on > a core dump. Reboot was uneventful, with fsck completing successfully. > Buildworld has been restarted, it'll pick up where it left off. > > The last entries in the buildworld log file were: > Building /usr/obj/usr/src/arm.armv7/lib/clang/libclang/Sema/SemaTemplateInstantiateDecl.pico > Building /usr/obj/usr/src/arm.armv7/lib/clang/libclang/Sema/SemaTemplateVariadic.pico > Building /usr/obj/usr/src/arm.armv7/lib/clang/libclang/Sema/SemaType.pico > Building /usr/obj/usr/src/arm.armv7/lib/clang/libclang/Sema/SemaWasm.pico > Building /usr/obj/usr/src/arm.armv7/lib/clang/libclang/Sema/SemaX86.pico > Building /usr/obj/usr/src/arm.armv7/lib/clang/libclang/Sema/TypeLocBuilder.pico > Building /usr/obj/usr/src/arm.armv7/lib/clang/libclang/Serialization/ASTCommon.pico > Building /usr/obj/usr/src/arm.armv7/lib/clang/libclang/Serialization/ASTReader.pico > Building /usr/obj/usr/src/arm.armv7/lib/clang/libclang/Serialization/ASTReaderDecl.pico > Building /usr/obj/usr/src/arm.armv7/lib/clang/libclang/Serialization/ASTReaderStmt.pico > > No warnings or errors of any kind appear on the serial console, ever. > > Is there some other way to get at debugger services in a case like this? > I understand it's possible to run programs under debugger "supervision" > at the time of invocation, but would that provide any extra avenues to > find out what's going wrong? I think not, but I'd like very much to gather > some useful information toward a fix. > > Thanks for reading, > > bob prohaska > > > > > > > > > > > [-- Attachment #2 --] <html><head></head><body>Hi,<br> <br> To me it sounds like your machine is overwhelmed by swapping.<br> <br> Try -j1 buildworld.<br> <br> Regards,<br> Ronald.<br> <br> <p><strong>Van:</strong> bob prohaska <fbsd@www.zefox.net><br> <strong>Datum:</strong> donderdag, 6 november 2025 15:04<br> <strong>Aan:</strong> freebsd-arm@freebsd.org<br> <strong>CC:</strong> freebsd-current@freebsd.org<br> <strong>Onderwerp:</strong> Arm v7 RPi2 -current unresponsive to debugger escape during buildworld</p> <blockquote style="padding-right: 0px; padding-left: 5px; margin-left: 5px; border-left: #000000 2px solid; margin-right: 0px"> <div class="MessageRFC822Viewer" id="P"> <div class="TextPlainViewer" id="P.P">For roughly the past year I've been seeing buildworld become unresponsive<br> compiling -current on a Pi2 (armv7). The stoppages seem random, sometimes<br> with no visible memory pressure, other times while swapping. The machine<br> uses a USB mechanican hard drive for root and swap.<br> <br> Numerous attemps to use enter-tilda-control-B to get into the debugger<br> have failed, with absolutely no response. In the most recent case the<br> disk activity light was flashing rapidly, a relatively uncommon event.<br> The frozen top window showed ~312 MB swap in use, less than half of<br> the maximum commonly seen for a -j3 buildworld.<br> <br> Looking at the log file after power-cycling it appeared to have last<br> updated the previous evening, so it seems unlikely it got stuck on<br> a core dump. Reboot was uneventful, with fsck completing successfully.<br> Buildworld has been restarted, it'll pick up where it left off.<br> <br> The last entries in the buildworld log file were:<br> Building /usr/obj/usr/src/arm.armv7/lib/clang/libclang/Sema/SemaTemplateInstantiateDecl.pico<br> Building /usr/obj/usr/src/arm.armv7/lib/clang/libclang/Sema/SemaTemplateVariadic.pico<br> Building /usr/obj/usr/src/arm.armv7/lib/clang/libclang/Sema/SemaType.pico<br> Building /usr/obj/usr/src/arm.armv7/lib/clang/libclang/Sema/SemaWasm.pico<br> Building /usr/obj/usr/src/arm.armv7/lib/clang/libclang/Sema/SemaX86.pico<br> Building /usr/obj/usr/src/arm.armv7/lib/clang/libclang/Sema/TypeLocBuilder.pico<br> Building /usr/obj/usr/src/arm.armv7/lib/clang/libclang/Serialization/ASTCommon.pico<br> Building /usr/obj/usr/src/arm.armv7/lib/clang/libclang/Serialization/ASTReader.pico<br> Building /usr/obj/usr/src/arm.armv7/lib/clang/libclang/Serialization/ASTReaderDecl.pico<br> Building /usr/obj/usr/src/arm.armv7/lib/clang/libclang/Serialization/ASTReaderStmt.pico<br> <br> No warnings or errors of any kind appear on the serial console, ever.<br> <br> Is there some other way to get at debugger services in a case like this?<br> I understand it's possible to run programs under debugger "supervision"<br> at the time of invocation, but would that provide any extra avenues to<br> find out what's going wrong? I think not, but I'd like very much to gather<br> some useful information toward a fix.<br> <br> Thanks for reading,<br> <br> bob prohaska<br> <br> <br> <br> <br> <br> <br> <br> </div> <hr></div> </blockquote> <br> </body></html>home | help
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