lkml.org 
[lkml]   [2017]   [Nov]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
SubjectRe: general protection fault in lockdep_invariant_state (2)
On Wed, Nov 08, 2017 at 09:19:53AM +0100, Dmitry Vyukov wrote:

> > R13: 0000000000402260 R14: 00000000004022f0 R15: 0000000000000000
> > 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: 3 PID: 2982 Comm: syzkaller521009 Not tainted 4.14.0-rc7-next-20171103+
> > #10
> > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
> > task: ffff88003d6b25c0 task.stack: ffff88003abd0000
> > RIP: 0010:invalidate_xhlock kernel/locking/lockdep.c:4719 [inline]
> > RIP: 0010:lockdep_invariant_state+0xd6/0x120 kernel/locking/lockdep.c:4793


Does this help?

diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index db933d063bfc..da2904418599 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -4793,7 +4793,8 @@ void lockdep_invariant_state(bool force)
* Verify the former, enforce the latter.
*/
WARN_ON_ONCE(!force && current->lockdep_depth);
- invalidate_xhlock(&xhlock(current->xhlock_idx));
+ if (current->xhlocks)
+ invalidate_xhlock(&xhlock(current->xhlock_idx));
}

static int cross_lock(struct lockdep_map *lock)
\
 
 \ /
  Last update: 2017-11-08 21:10    [W:0.137 / U:1.288 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site