Date: Tue, 23 Jan 2018 16:45:30 -0800 From: Chuck Tuffli <chuck@tuffli.net> To: "O'Connor, Daniel" <darius@dons.net.au> Cc: Konstantin Belousov <kostikbel@gmail.com>, FreeBSD Hackers <freebsd-hackers@freebsd.org>, Pedro Giffuni <pfg@freebsd.org> Subject: Re: examining Linux core file? Message-ID: <CAM0tzX0pa0H6ghWVerM5ZNF4fZpOHdXNA=M%2BXvrYXZedP%2BZCfQ@mail.gmail.com> In-Reply-To: <32C3FADA-073C-4942-B12F-AEB7F345766E@dons.net.au> References: <bfe13557-55f1-a04a-1367-9cbb58075323@FreeBSD.org> <20180116095908.GQ1684@kib.kiev.ua> <32C3FADA-073C-4942-B12F-AEB7F345766E@dons.net.au>
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On Tue, Jan 16, 2018 at 5:30 PM, O'Connor, Daniel <darius@dons.net.au> wrote:
>
>
>> On 16 Jan 2018, at 20:29, Konstantin Belousov <kostikbel@gmail.com> wrote:
>>>
>>> My memory is sketchy but you may need to build a complete
>>> cross-toolchain for that. Long-long ago we actually did that but the
>>> resulting linux binaries were weird and needed branding always.
>>
>> No cross-toolchain will help there. Problem is that the binary is Linux,
>> while core is FreeBSD. There are enough details significant to the debugger
>> that make such combination a new platform.
>
> Using ktrace / linux_kdump might help - or at least give some clues as to where it's failing too.
The ktrace output is interesting. Is there any way to show the address
causing the segfault?
dmesg shows:
pid 1123 (apt-get), uid 0: exited on signal 11 (core dumped)
ktrace shows:
...
1123 apt-get 1516724569.278210 CALL L64 write(0x1,0x800644000,0x21)
1123 apt-get 1516724569.284901 GIO L64 fd 1 wrote 33 bytes
"\rBuilding dependency tree... 50%\r"
1123 apt-get 1516724569.291711 RET L64 write 33/0x21
1123 apt-get 1516724569.298353 CALL L64 gettimeofday(0x7fffffffd410,0)
1123 apt-get 1516724569.305308 RET L64 gettimeofday 0
1123 apt-get 1516724569.312174 PSIG L64 SIGSEGV SIG_DFL code=SEGV_MAPERR
1123 apt-get 1516724569.312183 NAMI L64 "apt-get.core"
--chuck
help
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