On 2016/02/29 05:53PM, Cyril Bur wrote:
> Cover-letter for V1 of the series is at
> https://lists.ozlabs.org/pipermail/linuxppc-dev/2015-November/136350.html
>
> Cover-letter for V2 of the series is at
> https://lists.ozlabs.org/pipermail/linuxppc-dev/2016-January/138054.html
>
> Changes in V3:
> Addressed review comments from Michael Neuling
> - Made commit message in 4/9 better reflect the patch
> - Removed overuse of #ifdef blocks and redundant condition in 5/9
> - Split 6/8 in two to better prepare for 7,8,9
> - Removed #ifdefs in 6/9
>
> Changes in V4:
> - Addressed non ABI compliant ASM macros in 1/9
> - Fixed build breakage due to changing #ifdefs in V3 (6/9)
> - Reordered some conditions in if statements
>
> Changes in V5:
> - Enhanced basic-asm.h to provide ABI independent macro as pointed out by
> Naveen Rao.
> - Tested for both BE and LE builds. Had to disable -flto from the
> selftests/powerpc Makefile as it didn't play well with the custom ASM.
> - Added some extra debugging output to the vmx_signal testcase
> - Fixed comments in testing code
> - Updated VSX test code to use GCC Altivec macros
>
> Changes in V6:
> - Removed recursive definition of CFLAGS in math/Makefile
> - Corrected the use of the word param in favour of doubleword
> - Reordered some code in basic-asm.h and neatened some comments
This series is resulting in a kernel crash with one of the perf tests.
To reproduce, build perf and run the test for breakpoint overflow signal
handler.
# ./perf test -v 17
17: Test breakpoint overflow signal handler :
--- start ---
test child forked, pid 3753
failed opening event 0
failed opening event 0
cpu 0xd: Vector: 600 (Alignment) at [c0000000edd738c0]
pc: c00000000000a818: save_fpu+0xa8/0x2ac
lr: c00000000001568c: __giveup_fpu+0x2c/0x90
sp: c0000000edd73b40
msr: 800000000280b033
dar: c0000000edc436e0
dsisr: 42000000
current = 0xc0000000edc42c00
paca = 0xc000000007e82700 softe: 0 irq_happened: 0x01
pid = 3753, comm = perf
Linux version 4.6.0-rc3-nnr+ (root@rhel71le) (gcc version 4.8.3 20140911 (Red
Hat 4.8.3-8) (GCC) ) #93 SMP Wed May 4 22:01:06 IST 2016
enter ? for help
[link register ] c00000000001568c __giveup_fpu+0x2c/0x90
[c0000000edd73b40] 0000000000000000 (unreliable)
[c0000000edd73b70] c000000000015730 giveup_fpu+0x40/0xa0
[c0000000edd73ba0] c000000000015810 flush_fp_to_thread+0x80/0x90
[c0000000edd73bd0] c000000000026b3c setup_sigcontext.constprop.3+0xbc/0x1f0
[c0000000edd73c30] c0000000000274c4 handle_rt_signal64+0x3b4/0x7c0
[c0000000edd73d10] c000000000017ee0 do_signal+0x150/0x2b0
[c0000000edd73e00] c000000000018220 do_notify_resume+0xd0/0x110
[c0000000edd73e30] c000000000009844 ret_from_except_lite+0x70/0x74
--- Exception: 900 (Decrementer) at 00000000100b3c88
SP (3fffd08cfb20) is in userspace
d:mon> ls save_fpu
save_fpu: c00000000000a770
With v4.5, the test would fail, but not cause what looks to be an
alignment exception.
- Naveen
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