linux-kernel - BUG: unable to handle kernel paging request in memset

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Message-ID: <001a114099b0994a5e0563282c1c@google.com>
Date:   Fri, 19 Jan 2018 13:58:01 -0800
From:   syzbot <syzbot+29f08ad5cb6820798dfe@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, alexander.deucher@....com,
        alsa-devel@...a-project.org, chris@...is-wilson.co.uk,
        davem@...emloft.net, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, mchehab@...nel.org, mingo@...nel.org,
        o-takashi@...amocchi.jp, perex@...ex.cz,
        syzkaller-bugs@...glegroups.com, tiwai@...e.com
Subject: BUG: unable to handle kernel paging request in memset_erms (2)

Hello,

syzbot hit the following crash on mmots commit
2164355612187e55e8d60a28d2cc6b2337841a7e (Fri Jan 19 01:07:54 2018 +0000)
pci: test for unexpectedly disabled bridges

So far this crash happened 2 times on mmots.
C reproducer is attached.
syzkaller reproducer is attached.
Raw console output is attached.
compiler: gcc (GCC) 7.1.1 20170620
.config is attached.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+29f08ad5cb6820798dfe@...kaller.appspotmail.com
It will help syzbot understand when the bug is fixed. See footer for  
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If you forward the report, please keep this part and the footer.

BUG: unable to handle kernel paging request at ffffc90001691000
IP: memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:65
PGD 1dad2c067 P4D 1dad2c067 PUD 1dad2d067 PMD 1c6a8f067 PTE 0
Oops: 0002 [#1] SMP KASAN
Dumping ftrace buffer:
    (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 5739 Comm: syzkaller592073 Not tainted 4.15.0-rc8-mm1+ #57
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:65
RSP: 0018:ffff8801cbbdfb78 EFLAGS: 00010246
RAX: fffff520002d3f00 RBX: ffffc90001691000 RCX: 000000000000ee51
RDX: 000000000000ee51 RSI: 0000000000000000 RDI: ffffc90001691000
RBP: ffff8801cbbdfb98 R08: fffff520002d3fcb R09: ffffc90001691000
R10: 0000000000001dcb R11: fffff520002d3fca R12: 000000000000ee51
R13: 0000000000000000 R14: 00007ffffffff000 R15: 000000002001be51
FS:  00007f88ae7d7700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90001691000 CR3: 00000001ccefa005 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  memset include/linux/string.h:329 [inline]
  _copy_from_user+0xe9/0x110 lib/usercopy.c:16
  copy_from_user include/linux/uaccess.h:147 [inline]
  snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1347 [inline]
  snd_pcm_oss_write+0x438/0x880 sound/core/oss/pcm_oss.c:2659
  __vfs_write+0xef/0x970 fs/read_write.c:480
  vfs_write+0x189/0x510 fs/read_write.c:544
  SYSC_write fs/read_write.c:589 [inline]
  SyS_write+0xef/0x220 fs/read_write.c:581
  entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x44a559
RSP: 002b:00007f88ae7d6da8 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00000000006dcc24 RCX: 000000000044a559
RDX: 000000000000fe51 RSI: 000000002000c000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 00000000006dcc20
R13: 7073642f7665642f R14: 00800000c0045006 R15: 0000000000000001
Code: 48 c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3  
48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 <f3> aa 4c 89  
c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01
RIP: memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:65 RSP: ffff8801cbbdfb78
CR2: ffffc90001691000
---[ end trace 8f421641f3e10f44 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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