From: zhong jiang <zhongjiang@huawei.com>
To: <ldufour@linux.ibm.com>
Cc: Vinayak Menon <vinmenon@codeaurora.org>,
Linux-MM <linux-mm@kvack.org>,
"Wangkefeng (Kevin)" <wangkefeng.wang@huawei.com>,
<charante@codeaurora.org>, zhongjiang <zhongjiang@huawei.com>
Subject: Speculative page faults
Date: Sun, 8 Sep 2019 16:31:33 +0800 [thread overview]
Message-ID: <5D74BC65.4070309@huawei.com> (raw)
Hi, Laurent, Vinayak
I have got the following crash on 4.14 kernel with speculative page faults enabled.
Unfortunately, The issue disappears when trying disabling SPF.
The call trace is as follows.
Unable to handle kernel NULL pointer dereference at virtual address 00000000
user pgtable: 4k pages, 39-bit VAs, pgd = ffffffc177337000
[0000000000000000] *pgd=0000000177346003, *pud=0000000177346003, *pmd=0000000000000000
Internal error: Oops: 96000046 [#1] PREEMPT SMP
CPU: 0 PID: 3184 Comm: Signal Catcher VIP: 00 Tainted: G O 4.14.116 #1
PC is at __rb_erase_color+0x54/0x260
LR is at anon_vma_interval_tree_remove+0x2ac/0x2c0
Call trace:
[<ffffff8009aa45c4>] __rb_erase_color+0x54/0x260
[<ffffff80083a73f8>] anon_vma_interval_tree_remove+0x2ac/0x2c0
[<ffffff80083b96ac>] unlink_anon_vmas+0x84/0x170
[<ffffff80083aa8f4>] free_pgtables+0x9c/0x100
[<ffffff80083b6814>] exit_mmap+0xb0/0x1d8
[<ffffff8008227e8c>] mmput+0x3c/0xe0
[ffffff800822ed00>] do_exit+0x2f0/0x954
[<ffffff800822f41c>] do_group_exit+0x88/0x9c
[<ffffff800823b768>] get_signal+0x360/0x56c
[<ffffff8008208eb8>] do_notify_resume+0x150/0x5e4
Exception stack(0xffffffc1eac07ec0 to 0xffffffc1eac08000)
It seems to rb_node is empty accidentally under anon_vma rwsem when the process is exiting.
I have no idea whether any race existence or not to result in the issue.
Let me know if you have hit the issue or any suggestions.
Thanks,
zhong jiang
next reply other threads:[~2019-09-08 8:31 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-08 8:31 zhong jiang [this message]
2019-09-13 11:12 ` Laurent Dufour
2019-09-16 15:27 ` zhong jiang
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=5D74BC65.4070309@huawei.com \
--to=zhongjiang@huawei.com \
--cc=charante@codeaurora.org \
--cc=ldufour@linux.ibm.com \
--cc=linux-mm@kvack.org \
--cc=vinmenon@codeaurora.org \
--cc=wangkefeng.wang@huawei.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox