lkml.org 
[lkml]   [2018]   [Apr]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectBUG: sleeping function called from invalid context at arch/x86/mm/fault.c:LINE (2)
From
Hello,

syzbot hit the following crash on upstream commit
c18bb396d3d261ebbb4efbc05129c5d354c541e4 (Tue Apr 10 00:04:10 2018 +0000)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
syzbot dashboard link:
https://syzkaller.appspot.com/bug?extid=4af447792df4648be93b

syzkaller reproducer:
https://syzkaller.appspot.com/x/repro.syz?id=4934545564499968
Raw console output:
https://syzkaller.appspot.com/x/log.txt?id=6277896712749056
Kernel config:
https://syzkaller.appspot.com/x/.config?id=-1223000601505858474
compiler: gcc (GCC) 8.0.1 20180301 (experimental)

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+4af447792df4648be93b@syzkaller.appspotmail.com
It will help syzbot understand when the bug is fixed. See footer for
details.
If you forward the report, please keep this part and the footer.

IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
BUG: sleeping function called from invalid context at
arch/x86/mm/fault.c:1342
in_atomic(): 0, irqs_disabled(): 1, pid: 4512, name: blkid
1 lock held by blkid/4512:
#0: 00000000d5b4e650 (&mm->mmap_sem){++++}, at:
__do_page_fault+0x381/0xe40 arch/x86/mm/fault.c:1328
irq event stamp: 1812
hardirqs last enabled at (1811): [<ffffffff87600096>]
entry_SYSCALL_64_after_hwframe+0x52/0xb7
hardirqs last disabled at (1812): [<ffffffff87601402>]
error_entry+0x72/0xd0 arch/x86/entry/entry_64.S:1261
softirqs last enabled at (1804): [<ffffffff87800778>]
__do_softirq+0x778/0xaf5 kernel/softirq.c:311
softirqs last disabled at (1797): [<ffffffff8146dd91>] invoke_softirq
kernel/softirq.c:365 [inline]
softirqs last disabled at (1797): [<ffffffff8146dd91>] irq_exit+0x1d1/0x200
kernel/softirq.c:405
CPU: 1 PID: 4512 Comm: blkid Not tainted 4.16.0+ #16
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
BUG: unable to handle kernel paging request at 0000000041b5e1f3
PGD 1b4390067 P4D 1b4390067 PUD 0
Oops: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
(ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 4512 Comm: blkid Tainted: G W 4.16.0+ #16
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:msr_write_intercepted arch/x86/kvm/vmx.c:2126 [inline]
RIP: 0010:vmx_vcpu_run+0xa3d/0x25f0 arch/x86/kvm/vmx.c:9884
RSP: 0018:ffff8801b5d27380 EFLAGS: 00010046
==================================================================
BUG: KASAN: stack-out-of-bounds in __show_regs.cold.7+0x4e/0x54a
arch/x86/kernel/process_64.c:79
Read of size 8 at addr ffff8801b5d27300 by task blkid/4512

CPU: 1 PID: 4512 Comm: blkid Tainted: G W 4.16.0+ #16
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:

The buggy address belongs to the page:
page:ffffea0006d749c0 count:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: 0000000000000000 ffffea0006d70101 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffff8801b5d27200: f2 f2 f2 f2 00 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2
ffff8801b5d27280: f3 f3 f3 f3 f2 f2 f8 f2 f2 f2 f2 f2 f2 f2 00 00
> ffff8801b5d27300: f2 f2 f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00
^
ffff8801b5d27380: f1 f1 f1 f1 00 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2
ffff8801b5d27400: f2 f2 f2 f2 00 f2 f2 f2 f3 f3 f3 f3 00 00 00 00
==================================================================


---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
Direct all questions to syzkaller@googlegroups.com.

syzbot will keep track of this bug report.
If you forgot to add the Reported-by tag, once the fix for this bug is
merged
into any tree, please 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.

\
 
 \ /
  Last update: 2018-04-11 23:02    [W:0.052 / U:0.296 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site