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    SubjectRe: strace-4.18 test suite oopses sparc64 4.12 and 4.13-rc kernels
    From
    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?

    Thanks.

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