From: Jane Chu <jane.chu@oracle.com>
To: akpm@linux-foundation.org, dan.j.williams@intel.com,
mhocko@suse.com, jack@suse.cz, jglisse@redhat.com,
mike.kravetz@oracle.com, linux-mm@kvack.org,
linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] ipc/shm.c add ->pagesize function to shm_vm_ops
Date: Mon, 30 Jul 2018 20:08:48 -0700 [thread overview]
Message-ID: <a4c4bdab-b0f8-fb10-9b3d-f5740f30748c@oracle.com> (raw)
In-Reply-To: <20180730164459.zduhnk7itoldqnom@linux-r8p5>
Hi, Davidlohr,
On 7/30/2018 9:44 AM, Davidlohr Bueso wrote:
> On Fri, 27 Jul 2018, Jane Chu wrote:
>
>> Commit 05ea88608d4e13 (mm, hugetlbfs: introduce ->pagesize() to
>> vm_operations_struct) adds a new ->pagesize() function to
>> hugetlb_vm_ops, intended to cover all hugetlbfs backed files.
>>
>> With System V shared memory model, if "huge page" is specified,
>> the "shared memory" is backed by hugetlbfs files, but the mappings
>> initiated via shmget/shmat have their original vm_ops overwritten
>> with shm_vm_ops, so we need to add a ->pagesize function to shm_vm_ops.
>> Otherwise, vma_kernel_pagesize() returns PAGE_SIZE given a hugetlbfs
>> backed vma, result in below BUG:
>>
>> fs/hugetlbfs/inode.c
>> 443 if (unlikely(page_mapped(page))) {
>> 444 BUG_ON(truncate_op);
>>
>> [ 242.268342] hugetlbfs: oracle (4592): Using mlock ulimits for
>> SHM_HUGETLB is deprecated
>> [ 282.653208] ------------[ cut here ]------------
>> [ 282.708447] kernel BUG at fs/hugetlbfs/inode.c:444!
>> [ 282.818957] Modules linked in: nfsv3 rpcsec_gss_krb5 nfsv4 ...
>> [ 284.025873] CPU: 35 PID: 5583 Comm: oracle_5583_sbt Not tainted
>> 4.14.35-1829.el7uek.x86_64 #2
>> [ 284.246609] task: ffff9bf0507aaf80 task.stack: ffffa9e625628000
>> [ 284.317455] RIP: 0010:remove_inode_hugepages+0x3db/0x3e2
>> ....
>> [ 285.292389] Call Trace:
>> [ 285.321630] hugetlbfs_evict_inode+0x1e/0x3e
>> [ 285.372707] evict+0xdb/0x1af
>> [ 285.408185] iput+0x1a2/0x1f7
>> [ 285.443661] dentry_unlink_inode+0xc6/0xf0
>> [ 285.492661] __dentry_kill+0xd8/0x18d
>> [ 285.536459] dput+0x1b5/0x1ed
>> [ 285.571939] __fput+0x18b/0x216
>> [ 285.609495] ____fput+0xe/0x10
>> [ 285.646030] task_work_run+0x90/0xa7
>> [ 285.688788] exit_to_usermode_loop+0xdd/0x116
>> [ 285.740905] do_syscall_64+0x187/0x1ae
>> [ 285.785740] entry_SYSCALL_64_after_hwframe+0x150/0x0
>>
>> Suggested-by: Mike Kravetz <mike.kravetz@oracle.com>
>> Signed-off-by: Jane Chu <jane.chu@oracle.com>
>
> Acked-by: Davidlohr Bueso <dbueso@suse.de>
Thank you!
-jane
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prev parent reply other threads:[~2018-07-31 3:08 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-27 21:17 [PATCH] ipc/shm.c add ->pagesize function to shm_vm_ops Jane Chu
2018-07-27 21:43 ` Mike Kravetz
2018-07-27 21:50 ` Andrew Morton
2018-07-28 0:40 ` Jane Chu
2018-07-28 19:02 ` Matthew Wilcox
2018-07-31 3:06 ` Jane Chu
2018-07-30 8:58 ` Michal Hocko
2018-07-31 3:07 ` Jane Chu
2018-07-30 16:44 ` Davidlohr Bueso
2018-07-31 3:08 ` Jane Chu [this message]
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