Date: Fri, 2 Oct 2015 09:19:13 +0300 From: Andriy Gapon <avg@FreeBSD.org> To: John Baldwin <jhb@FreeBSD.org>, freebsd-current@FreeBSD.org Subject: Re: kgdb ported to devel/gdb Message-ID: <560E21E1.6010002@FreeBSD.org> In-Reply-To: <2662739.EWKL7pkiRb@ralph.baldwin.cx> References: <2662739.EWKL7pkiRb@ralph.baldwin.cx>
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On 01/09/2015 00:32, John Baldwin wrote: > Over the past several months I have ported kgdb to the version of gdb in ports. > I have a pending patch to the gdb port to add fork following, but once that is > done (and possibly after updating to 7.10) I will try to add my existing work > as a KGDB option on the port. Until such time, you can try the newer kgdb by > checking out my branch from git. > > Here's my cheat sheet on how to build the newer kgdb. Note that if you build > a world with my cross-libkvm patches you should get a kgdb that can debug > i386 cores on amd64 and vice versa. > > All of the targets that the native devel/gdb support have their backends > ported (so x86, sparc64, powerpc and powerpc64). I have not yet ported > arm or mips since those don't work for userland yet in upstream gdb. I > have only compiled non-x86 backends. Testing of the new kgdb on sparc64 > and powerpc would be appreciated. > > Steps: > > % git clone https://github.com/bsdjhb/gdb.git > % git checkout freebsd-7.9.1-kgdb > % fetch http://www.freebsd.org/~jhb/gdb/build > % pkg install devel/gdb > > # Having gdb installed will mean you get the python bindings in the right > # place. > > % pkg install gmake > > # I think this is the only build tool you need? > > % ./build > % cd obj > > # Replace 'obj' with 'obj.<arch>' for all but amd64 > > % gmake > > # ... wait > > You will now have a binary at 'obj/gdb/kgdb'. I just run it from my obj > tree currently when testing. Once it becomes part of the port it will get > installed as /usr/local/bin/kgdb791 or some such. John, first of all, thank you very much for this! I followed your instructions substituting freebsd-7.10-kgdb for freebsd-7.9.1-kgdb branch (devel/gdb is also at version 7.10) and the build process worked just fine. However, when I try to use the new kgdb it works, but I get some annoying diagnostics: (kgdb) bt Python Exception <type 'exceptions.NameError'> Installation error: gdb.execute_unwinders function is missing: Python Exception <type 'exceptions.ImportError'> No module named gdb.frames: #0 doadump (textdump=1) at /usr/src/sys/kern/kern_shutdown.c:291 #1 0xffffffff8063453f in kern_reboot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:359 Python Exception <type 'exceptions.NameError'> Installation error: gdb.execute_unwinders function is missing: Python Exception <type 'exceptions.NameError'> Installation error: gdb.execute_unwinders function is missing: #2 0xffffffff80634ba4 in vpanic (fmt=<optimized out>, ap=<optimized out>) at /usr/src/sys/kern/kern_shutdown.c:635 Python Exception <type 'exceptions.NameError'> Installation error: gdb.execute_unwinders function is missing: #3 0xffffffff806348a3 in panic (fmt=<unavailable>) at /usr/src/sys/kern/kern_shutdown.c:568 Python Exception <type 'exceptions.NameError'> Installation error: gdb.execute_unwinders function is missing: #4 0xffffffff8041bba7 in db_panic (addr=<optimized out>, have_addr=<unavailable>, count=<unavailable>, modif=<unavailable>) at /usr/src/sys/ddb/db_command.c:473 Python Exception <type 'exceptions.NameError'> Installation error: gdb.execute_unwinders function is missing: #5 0xffffffff8041b67b in db_command (last_cmdp=<optimized out>, cmd_table=0x0, dopager=<optimized out>) at /usr/src/sys/ddb/db_command.c:440 #6 0xffffffff8041b524 in db_command_loop () at /usr/src/sys/ddb/db_command.c:493 Python Exception <type 'exceptions.NameError'> Installation error: gdb.execute_unwinders function is missing: #7 0xffffffff8041de0b in db_trap (type=<optimized out>, code=<unavailable>) at /usr/src/sys/ddb/db_main.c:251 Python Exception <type 'exceptions.NameError'> Installation error: gdb.execute_unwinders function is missing: Python Exception <type 'exceptions.NameError'> Installation error: gdb.execute_unwinders function is missing: #8 0xffffffff80669de8 in kdb_trap (type=19, code=0, tf=0xffffffff80f976d0 <nmi0_stack+3888>) at /usr/src/sys/kern/subr_kdb.c:653 Python Exception <type 'exceptions.NameError'> Installation error: gdb.execute_unwinders function is missing: #9 0xffffffff80820d26 in trap (frame=0xffffffff80f976d0 <nmi0_stack+3888>) at /usr/src/sys/amd64/amd64/trap.c:381 #10 0xffffffff80809623 in nmi_calltrap () at /usr/src/sys/amd64/amd64/exception.S:514 Python Exception <type 'exceptions.NameError'> Installation error: gdb.execute_unwinders function is missing: #11 0xffffffff80619e1f in __mtx_assert (c=<optimized out>, what=<optimized out>, file=<optimized out>, line=<optimized out>) at /usr/src/sys/kern/kern_mutex.c:842 Backtrace stopped: previous frame inner to this frame (corrupt stack?) Did I miss something? Thanks! -- Andriy Gapon
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