Hello,

First of all, thanks for the report and sorry I have no time now so maybe
I should investigate the problem next week.

On Wed, Dec 14, 2016 at 03:34:54PM +0100, Andreas Schwab wrote:

When running the jemalloc-4.4.0 testsuite on aarch64 with glibc 2.24 the
test/unit/junk test hangs in memset:

(gdb) r
Starting program: /tmp/jemalloc/jemalloc-4.4.0/test/unit/junk
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
test_junk_small: pass
test_junk_large: pass
^C
Program received signal SIGINT, Interrupt.
memset () at ../sysdeps/aarch64/memset.S:91
91              str     q0, [dstin]
(gdb) x/i $pc
=> 0xffffb7ddf54c <memset+140>: str     q0, [x0]

x0 is pointing to the start of this mmap'd block:

      0xffffb7400000     0xffffb7600000   0x200000        0x0

Any attempt to contine execution or step over the insn still causes the
process to hang here.  Only after accessing the memory through the
debugger the test successfully continues to completion.

You mean program itself access the address(ie, 0xffffb7400000) is hang
while access the address from the debugger is OK?

Scratch head. :/

Can you reproduce it easily?
Did you test it in real machine or qemu on x86?
Could you show me how I can reproduce it?
I want to test it in x86 machine, first of all.
Unfortunately, I don't have any aarch64 platform now so maybe I have to
run it on qemu on x86 until I can set up aarch64 platform if it is reproducible
on real machine only.

The kernel has been configured with transparent hugepages.

CONFIG_TRANSPARENT_HUGEPAGE=y
CONFIG_TRANSPARENT_HUGEPAGE_ALWAYS=y
# CONFIG_TRANSPARENT_HUGEPAGE_MADVISE is not set
CONFIG_TRANSPARENT_HUGE_PAGECACHE=y

What's the exact kernel version?
I don't think it's HUGE_PAGECACHE problem but to narrow down the scope,
could you test it without CONFIG_TRANSPARENT_HUGE_PAGECACHE?

Thanks.

This issue has been bisected to commit
b8d3c4c3009d42869dc03a1da0efc2aa687d0ab4 ("mm/huge_memory.c: don't split
THP page when MADV_FREE syscall is called").

Andreas.

-- 
Andreas Schwab, SUSE Labs, schwab at suse.de
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