----- Original Message -----
Hello,
We ran automated tests on a recent commit from this kernel tree:
Kernel repo: git://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git Commit: 3b5f97139acc - KVM: PPC: Book3S HV: Flush link stack on guest exit to host kernelThe results of these automated tests are provided below.
Overall result: FAILED (see details below) Merge: OK Compile: OK Tests: FAILEDAll kernel binaries, config files, and logs are available for download here:
https://artifacts.cki-project.org/pipelines/314344
One or more kernel tests failed:
ppc64le: ❌ LTP
I suspect kernel bug.
There were couple of 'math' runtest related failures in recent couple days. In all cases, some data file used by test was missing. Presumably because binary that generates it crashed.
I managed to reproduce one failure with this CKI build, which I believe is the same problem.
We crash early during load, before any LTP code runs:
(gdb) r Starting program: /mnt/testarea/ltp/testcases/bin/genasin
Program received signal SIGBUS, Bus error. dl_main (phdr=0x10000040, phnum=<optimized out>, user_entry=0x7fffffffe760, auxv=<optimized out>) at rtld.c:1362 1362 switch (ph->p_type) (gdb) bt #0 dl_main (phdr=0x10000040, phnum=<optimized out>, user_entry=0x7fffffffe760, auxv=<optimized out>) at rtld.c:1362 #1 0x00007ffff7fcf3c8 in _dl_sysdep_start (start_argptr=<optimized out>, dl_main=0x7ffff7fb37b0 <dl_main>) at ../elf/dl-sysdep.c:253 #2 0x00007ffff7fb1d1c in _dl_start_final (arg=arg@entry=0x7fffffffee20, info=info@entry=0x7fffffffe870) at rtld.c:445 #3 0x00007ffff7fb2f5c in _dl_start (arg=0x7fffffffee20) at rtld.c:537 #4 0x00007ffff7fb14d8 in _start () from /lib64/ld64.so.2 (gdb) f 0 #0 dl_main (phdr=0x10000040, phnum=<optimized out>, user_entry=0x7fffffffe760, auxv=<optimized out>) at rtld.c:1362 1362 switch (ph->p_type) (gdb) l 1357 /* And it was opened directly. */ 1358 ++main_map->l_direct_opencount; 1359 1360 /* Scan the program header table for the dynamic section. */ 1361 for (ph = phdr; ph < &phdr[phnum]; ++ph) 1362 switch (ph->p_type) 1363 { 1364 case PT_PHDR: 1365 /* Find out the load address. */ 1366 main_map->l_addr = (ElfW(Addr)) phdr - ph->p_vaddr;
(gdb) p ph $1 = (const Elf64_Phdr *) 0x10000040
(gdb) p *ph Cannot access memory at address 0x10000040
(gdb) info proc map process 1110670 Mapped address spaces:
Start Addr End Addr Size Offset objfile 0x10000000 0x10010000 0x10000 0x0 /mnt/testarea/ltp/testcases/bin/genasin 0x10010000 0x10030000 0x20000 0x0 /mnt/testarea/ltp/testcases/bin/genasin 0x7ffff7f90000 0x7ffff7fb0000 0x20000 0x0 [vdso] 0x7ffff7fb0000 0x7ffff7fe0000 0x30000 0x0 /usr/lib64/ld-2.30.so 0x7ffff7fe0000 0x7ffff8000000 0x20000 0x20000 /usr/lib64/ld-2.30.so 0x7ffffffd0000 0x800000000000 0x30000 0x0 [stack]
(gdb) x/1x 0x10000040 0x10000040: Cannot access memory at address 0x10000040
# /mnt/testarea/ltp/testcases/bin/genasin Bus error (core dumped)
However, as soon as I copy that binary somewhere else, it works fine:
# cp /mnt/testarea/ltp/testcases/bin/genasin /tmp # /tmp/genasin # echo $? 0
# cp /mnt/testarea/ltp/testcases/bin/genasin /mnt/testarea/ltp/testcases/bin/genasin2 # /mnt/testarea/ltp/testcases/bin/genasin2 # echo $? 0
# /mnt/testarea/ltp/testcases/bin/genasin Bus error (core dumped)
# diff /mnt/testarea/ltp/testcases/bin/genasin /mnt/testarea/ltp/testcases/bin/genasin2; echo $? 0
# lscpu Architecture: ppc64le Byte Order: Little Endian CPU(s): 160 On-line CPU(s) list: 0-159 Thread(s) per core: 4 Core(s) per socket: 20 Socket(s): 2 NUMA node(s): 2 Model: 2.2 (pvr 004e 1202) Model name: POWER9, altivec supported Frequency boost: enabled CPU max MHz: 3800.0000 CPU min MHz: 2166.0000 L1d cache: 1.3 MiB L1i cache: 1.3 MiB L2 cache: 10 MiB L3 cache: 200 MiB NUMA node0 CPU(s): 0-79 NUMA node8 CPU(s): 80-159 Vulnerability Itlb multihit: Not affected Vulnerability L1tf: Not affected Vulnerability Mds: Not affected Vulnerability Meltdown: Mitigation; RFI Flush, L1D private per thread Vulnerability Spec store bypass: Mitigation; Kernel entry/exit barrier (eieio) Vulnerability Spectre v1: Mitigation; __user pointer sanitization, ori31 speculation barrier enabled Vulnerability Spectre v2: Mitigation; Indirect branch cache disabled, Software link stack flush Vulnerability Tsx async abort: Not affected