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Subjects390 hugetlb oops with libhugetlbfs test-suite
Hi Gerald,

Having noticed that the hugetlbfs code recently got an update to work on s390,
I decided to port the libhugetlbfs test-suite to work on s390. The current
development snapshot is available at
http://libhugetlbfs.ozlabs.org/snapshots/libhugetlbfs-dev-20080724.tar.gz. You
will need a patch [1] to build on s390, but it should roughly work otherwise.
The specific testcase that causes the oops is counters. The bit set in the
flags is PG_Reserved, I think.

Bad page state in process 'counters'
page:000003e040000000 flags:0x0000000000000400 mapping:0000000000000000 mapcount
:0 count:0
Trying to fix it up, but a reboot is needed
Backtrace:
CPU: 3 Not tainted 2.6.26-autokern1 #1
Process counters (pid: 5578, task: 000000003f3ca958, ksp: 000000003f1bbc08)
0000000000000005 000000003f1bb920 0000000000000002 0000000000000000
000000003f1bb9c0 000000003f1bb938 000000003f1bb938 000000000003cfe2
0000000000000000 0000000000000400 0000000000000000 000000000000000b
0000000000000008 0000000000000000 000000003f1bb920 000000003f1bb998
000000000024a780 0000000000016b0a 000000003f1bb920 000000003f1bb970
Call Trace:
(Ý<0000000000016a6c>¨ show_trace+0xdc/0xec)
Ý<000000000007a38a>¨ bad_page+0x96/0xc8
Ý<000000000007b11c>¨ free_hot_cold_page+0x9c/0x1e4
Ý<0000000000099e4a>¨ __unmap_hugepage_range+0x38a/0x3cc
Ý<0000000000099edc>¨ unmap_hugepage_range+0x50/0x78
Ý<00000000000877d6>¨ unmap_vmas+0x14e/0xb34
Ý<000000000008c6f2>¨ exit_mmap+0x14a/0x2f8
Ý<00000000000397dc>¨ mmput+0x60/0x110
Ý<00000000000401b4>¨ do_exit+0x264/0x7f4
Ý<00000000000407d6>¨ do_group_exit+0x92/0xc0
Ý<000000000004b558>¨ get_signal_to_deliver+0x344/0x36c
Ý<000000000001d746>¨ do_signal+0xe2/0x878
Ý<0000000000023b7a>¨ sysc_sigpending+0xe/0x22
Ý<000000000040123a>¨ 0x40123a
[1]

libhugetlbfs: Add basic s390x support

The tests/Makefile change is needed until the signal check can be added
for s390.

diff --git a/Makefile b/Makefile
index f1f83fa..59fdb47 100644
--- a/Makefile
+++ b/Makefile
@@ -63,6 +63,13 @@ CC64 = gcc -m64
LIB64 = lib64
CFLAGS += -DNO_ELFLINK
else
+ifeq ($(ARCH),s390x)
+CC64 = gcc -m64
+CC32 = gcc -m31
+LIB64 = lib64
+LIB32 = lib
+CFLAGS += -DNO_ELFLINK
+else
$(error "Unrecognized architecture ($(ARCH))")
endif
endif
@@ -70,6 +77,7 @@ endif
endif
endif
endif
+endif

ifdef CC32
OBJDIRS += obj32
diff --git a/tests/Makefile b/tests/Makefile
index b723db7..ebd7fb8 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -2,7 +2,7 @@ PREFIX = /usr/local

LIB_TESTS = gethugepagesize test_root find_path unlinked_fd misalign \
readback truncate shared private fork-cow empty_mounts large_mounts \
- meminfo_nohuge ptrace-write-hugepage icache-hygiene slbpacaflush \
+ meminfo_nohuge ptrace-write-hugepage slbpacaflush \
chunk-overcommit mprotect alloc-instantiate-race mlock \
truncate_reserve_wraparound truncate_sigbus_versus_oom \
map_high_truncate_2 truncate_above_4GB direct \
--
Nishanth Aravamudan <nacc@us.ibm.com>
IBM Linux Technology Center
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