From: syzbot <syzbot+c75f181dc8429d2eb887@syzkaller.appspotmail.com>
To: linux-kernel@vger.kernel.org, linux-unionfs@vger.kernel.org,
miklos@szeredi.hu, syzkaller-bugs@googlegroups.com
Subject: general protection fault in ovl_free_fs
Date: Fri, 07 Sep 2018 01:38:02 -0700 [thread overview]
Message-ID: <000000000000f9bd97057543ec30@google.com> (raw)
Hello,
syzbot found the following crash on:
HEAD commit: b36fdc6853a3 Merge tag 'gpio-v4.19-2' of git://git.kernel...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13579cd1400000
kernel config: https://syzkaller.appspot.com/x/.config?x=6c9564cd177daf0c
dashboard link: https://syzkaller.appspot.com/bug?extid=c75f181dc8429d2eb887
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+c75f181dc8429d2eb887@syzkaller.appspotmail.com
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
CPU: 0 PID: 12806 Comm: syz-executor3 Not tainted 4.19.0-rc2+ #224
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:ovl_free_fs+0x4d9/0x650 fs/overlayfs/super.c:226
Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 67 01 00 00 48
b8 00 00 00 00 00 fc ff df 4c 8b 23 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f
85 56 01 00 00 49 8b 3c 24 e8 d4 0a 01 00 e9 37 fc
RSP: 0018:ffff8800aec7f7b8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff880111d7ef00 RCX: ffffc90003487000
RDX: 0000000000000000 RSI: ffffffff827c844a RDI: 0000000000000001
RBP: ffff8800aec7f810 R08: ffff8801b9cae080 R09: ffffed003b6046de
R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000000
R13: ffff880111d7ef20 R14: fffffffffffffff4 R15: ffff880111d7ef00
FS: 00007f715a1ab700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000002242e80 CR3: 000000018698d000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending
cookies. Check SNMP counters.
Call Trace:
ovl_fill_super+0x4f1/0x3ffc fs/overlayfs/super.c:1508
mount_nodev+0x6b/0x110 fs/super.c:1204
ovl_mount+0x2c/0x40 fs/overlayfs/super.c:1516
mount_fs+0xae/0x328 fs/super.c:1261
vfs_kern_mount.part.35+0xdc/0x4f0 fs/namespace.c:961
vfs_kern_mount fs/namespace.c:951 [inline]
do_new_mount fs/namespace.c:2457 [inline]
do_mount+0x581/0x30e0 fs/namespace.c:2787
ksys_mount+0x12d/0x140 fs/namespace.c:3003
__do_sys_mount fs/namespace.c:3017 [inline]
__se_sys_mount fs/namespace.c:3014 [inline]
__x64_sys_mount+0xbe/0x150 fs/namespace.c:3014
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457099
Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
ff 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f715a1aac78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f715a1ab6d4 RCX: 0000000000457099
RDX: 00000000200000c0 RSI: 0000000020000000 RDI: 0000000000000000
RBP: 00000000009300a0 R08: 0000000020000100 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00000000004d3300 R14: 00000000004c8241 R15: 000000000000002a
Modules linked in:
Dumping ftrace buffer:
(ftrace buffer empty)
---[ end trace a35d50b1706abe7c ]---
RIP: 0010:ovl_free_fs+0x4d9/0x650 fs/overlayfs/super.c:226
Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 67 01 00 00 48
b8 00 00 00 00 00 fc ff df 4c 8b 23 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f
85 56 01 00 00 49 8b 3c 24 e8 d4 0a 01 00 e9 37 fc
RSP: 0018:ffff8800aec7f7b8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff880111d7ef00 RCX: ffffc90003487000
RDX: 0000000000000000 RSI: ffffffff827c844a RDI: 0000000000000001
RBP: ffff8800aec7f810 R08: ffff8801b9cae080 R09: ffffed003b6046de
R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000000
R13: ffff880111d7ef20 R14: fffffffffffffff4 R15: ffff880111d7ef00
FS: 00007f715a1ab700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000002242e80 CR3: 000000018698d000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
syzbot.
next reply other threads:[~2018-09-07 8:38 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-07 8:38 syzbot [this message]
2018-09-09 1:43 ` general protection fault in ovl_free_fs syzbot
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=000000000000f9bd97057543ec30@google.com \
--to=syzbot+c75f181dc8429d2eb887@syzkaller.appspotmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-unionfs@vger.kernel.org \
--cc=miklos@szeredi.hu \
--cc=syzkaller-bugs@googlegroups.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.