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SubjectRe: strace-4.18 test suite oopses sparc64 4.12 and 4.13-rc kernels
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From: David Miller <davem@davemloft.net>
Date: Fri, 28 Jul 2017 11:27:41 -0700 (PDT)

> From: Mikael Pettersson <mikpelinux@gmail.com>
> Date: Fri, 28 Jul 2017 10:45:15 +0200
>
>> David Miller writes:
>> > From: Mikael Pettersson <mikpelinux@gmail.com>
>> > Date: Thu, 27 Jul 2017 21:45:25 +0200
>> >
>> > > Attempting to build strace-4.18 as sparcv9 code and run its test suite
>> > > on a sparc64 machine (Sun Blade 2500 w/ 2 x USIIIi in my case) fails
>> > > reliably in three test cases (sched.gen, sched_xetattr.gen, and poll)
>> > > because two test binaries (sched_xetattr and poll) OOPS the kernel and
>> > > get killed. Sample dmesg from 4.13-rc2:
>> > >
>> > > [42912.270398] Unable to handle kernel NULL pointer dereference
>> > > [42912.327717] tsk->{mm,active_mm}->context = 000000000000136a
>> > > [42912.383789] tsk->{mm,active_mm}->pgd = fff0000227db4000
>> > > [42912.435247] \|/ ____ \|/
>> > > "@'/ .. \`@"
>> > > /_| \__/ |_\
>> > > \__U_/
>> > > [42912.559982] sched_xetattr(21866): Oops [#1]
>> > > [42912.597773] CPU: 0 PID: 21866 Comm: sched_xetattr Not tainted 4.13.0-rc2 #1
>> > > [42912.672138] task: fff0000229a5c380 task.stack: fff0000227dec000
>> > > [42912.732876] TSTATE: 0000004411001603 TPC: 00000000007570fc TNPC: 0000000000757110 Y: 00000000 Not tainted
>> > > [42912.845079] TPC: <__bzero+0x20/0xc0>
>> > > [42912.874870] g0: 0000000000000000 g1: 0000000000000000 g2: 0000003000000000 g3: 00000000008ca100
>> > > [42912.972120] g4: fff0000229a5c380 g5: fff000023ef44000 g6: fff0000227dec000 g7: 0000000000000030
>> > > [42913.069446] o0: 0000000000000030 o1: fff0000227defe70 o2: 0000000000000000 o3: 0000000000000030
>> > > [42913.166765] o4: fff0000227defe70 o5: 0000000000000000 sp: fff0000227def5c1 ret_pc: 0000000000474fa4
>> > > [42913.268664] RPC: <SyS_sched_setattr+0xb0/0x150>
>> >
>> > This looks really strange. It is a memset() call with the buffer pointer
>> > and length arguments reversed.
>> >
>> > What exact command did you give to configure and build strace-4.18 so that
>> > I can try to reproduce this?
>>
>> It's an rpmbuild --rebuild of Fedora's strace-4.18-1.fc24.src.rpm, but according to the
>> build log the following should do it:
>>
>> export CFLAGS='-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -grecord-gcc-switches -m32 -mcpu=ultrasparc'
>> ./configure --build=sparcv9-unknown-linux-gnu --host=sparcv9-unknown-linux-gnu --program-prefix= --disable-dependency-tracking --prefix=/usr --exec-prefix=/u
>> sr --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib --libexecdir=/usr/libexec --local
>> statedir=/var --sharedstatedir=/var/lib --mandir=/usr/share/man --infodir=/usr/share/info
>> make -j2
>> make -j2 -k check VERBOSE=1
>
> I guess your gcc is emitting 64-bit code by default?
>
> Because simply using that configure line doesn't cause any problems for me and
> I get 32-bit binaries from the build.
> .

I've just also done a forced 64-bit build with "CC="gcc -m64
./configure --build=sparc64-unknown-linux-gnu ..." and it built just
fine and the testsuite ran without incident.

I cannot reporduce your crashes at all.

Please provide me with the binaries you have which trigger the OOPS
and tell me exactly how to run them.

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