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Date:   Tue, 12 Dec 2017 09:03:01 -0800
From:   syzbot 
        <bot+2ae755141b3df39bc92fbca1cb7272b7de1334b5@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, dhowells@...hat.com, hannes@...xchg.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org, mhocko@...e.com,
        mingo@...nel.org, syzkaller-bugs@...glegroups.com, vbabka@...e.cz
Subject: general protection fault in page_mapping

Hello,

syzkaller hit the following crash on  
82bcf1def3b5f1251177ad47c44f7e17af039b4b
git://git.cmpxchg.org/linux-mmots.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.
C reproducer is attached
syzkaller reproducer is attached. See https://goo.gl/kgGztJ
for information about syzkaller reproducers


audit: type=1400 audit(1512751226.892:7): avc:  denied  { map } for   
pid=3149 comm="syzkaller233597" path="/root/syzkaller233597068" dev="sda1"  
ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023  
tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
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
Dumping ftrace buffer:
    (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 3149 Comm: syzkaller233597 Not tainted 4.15.0-rc2-mm1+ #39
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline]
RIP: 0010:compound_head include/linux/page-flags.h:147 [inline]
RIP: 0010:page_mapping+0xa4/0x530 mm/util.c:475
RSP: 0018:ffff8801c5177320 EFLAGS: 00010202
RAX: 0000000000000004 RBX: 1ffff10038a2ee65 RCX: ffffffff81950c5d
RDX: 0000000000000000 RSI: 1ffff10038a2ef03 RDI: 0000000000000000
RBP: ffff8801c5177470 R08: ffffed0038a6fbac R09: ffff8801c537dd40
R10: ffff8801d6e8c518 R11: ffffed0038a6fbab R12: 0000000000000000
R13: ffff8801c5177448 R14: dffffc0000000000 R15: 0000000000000020
FS:  00000000021da880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020a23000 CR3: 00000001c6bf5000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  set_page_dirty+0xb9/0x5d0 mm/page-writeback.c:2544
  rds_atomic_free_op+0xc2/0x330 net/rds/rdma.c:481
  rds_message_purge net/rds/message.c:79 [inline]
  rds_message_put+0x53c/0x6b0 net/rds/message.c:91
  rds_sendmsg+0x14ee/0x1f90 net/rds/send.c:1204
  sock_sendmsg_nosec net/socket.c:636 [inline]
  sock_sendmsg+0xca/0x110 net/socket.c:646
  ___sys_sendmsg+0x75b/0x8a0 net/socket.c:2026
  __sys_sendmsg+0xe5/0x210 net/socket.c:2060
  SYSC_sendmsg net/socket.c:2071 [inline]
  SyS_sendmsg+0x2d/0x50 net/socket.c:2067
  entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x43fe49
RSP: 002b:00007fffab075338 EFLAGS: 00000217 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fe49
RDX: 0000000000000000 RSI: 0000000020159fc8 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004017b0
R13: 0000000000401840 R14: 0000000000000000 R15: 0000000000000000
Code: f2 f2 f2 c7 40 14 00 f2 f2 f2 c7 40 18 f2 f2 f2 f2 c7 40 1c 00 f2 f2  
f2 c7 40 20 f3 f3 f3 f3 e8 43 29 db ff 4c 89 f8 48 c1 e8 03 <42> 80 3c 30  
00 0f 85 41 04 00 00 4d 8d b5 00 ff ff ff 48 ba 00
RIP: __read_once_size include/linux/compiler.h:183 [inline] RSP:  
ffff8801c5177320
RIP: compound_head include/linux/page-flags.h:147 [inline] RSP:  
ffff8801c5177320
RIP: page_mapping+0xa4/0x530 mm/util.c:475 RSP: ffff8801c5177320
---[ end trace f878597b0d0664a0 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
Direct all questions to syzkaller@...glegroups.com.
Please credit me with: Reported-by: syzbot <syzkaller@...glegroups.com>

syzbot will keep track of this bug report.
Once a fix for this bug is merged into any tree, reply to this email with:
#syz fix: exact-commit-title
If you want to test a patch for this bug, please reply with:
#syz test: git://repo/address.git branch
and provide the patch inline or as an attachment.
To mark this as a duplicate of another syzbot report, please reply with:
#syz dup: exact-subject-of-another-report
If it's a one-off invalid bug report, please reply with:
#syz invalid
Note: if the crash happens again, it will cause creation of a new bug  
report.
Note: all commands must start from beginning of the line in the email body.

View attachment "config.txt" of type "text/plain" (126475 bytes)

Download attachment "raw.log" of type "application/octet-stream" (6109 bytes)

View attachment "repro.txt" of type "text/plain" (974 bytes)

Download attachment "repro.c" of type "application/octet-stream" (2841 bytes)

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