On Fri, Mar 03, 2017 at 01:04:39PM -0500, Dave Jones wrote:
> On Thu, Mar 02, 2017 at 06:04:33PM -0800, Liu Bo wrote:
> > On Thu, Mar 02, 2017 at 07:58:01AM -0800, Liu Bo wrote:
> > > On Wed, Mar 01, 2017 at 03:03:19PM -0500, Dave Jones wrote:
> > > > On Tue, Feb 28, 2017 at 05:12:01PM -0800, Liu Bo wrote:
> > > > > On Mon, Feb 27, 2017 at 11:23:42AM -0500, Dave Jones wrote:
> > > > > > On Mon, Feb 27, 2017 at 07:53:48AM -0800, Liu Bo wrote:
> > > > > > > On Sun, Feb 26, 2017 at 07:18:42PM -0500, Dave Jones wrote:
> > > > > > > > Hitting this fairly frequently.. I'm not sure if this is the
> same bug I've
> > > > > > > > been hitting occasionally since 4.9. The assertion looks new
> to me at least.
> > > > > > > >
> > > > > > >
> > > > > > > It was recently introduced by my commit and used to catch data
> loss at truncate.
> > > > > > >
> > > > > > > Were you running the test with a mkfs.btrfs -O NO_HOLES?
> > > > > > > (We just queued a fix for the NO_HOLES case in btrfs-next.)
> > > > > >
> > > > > > No, a fs created with default mkfs.btrfs options.
> > > > >
> > > > > I have this patch[1] to fix a bug which results in file hole
> extent, and this
> > > > > bug could lead us to hit the assertion.
> > > > >
> > > > > Would you try to run the test w/ it, please?
> > > > >
> > > > > [1]: https://patchwork.kernel.org/patch/9597281/
> > > >
> > > > Made no difference. Still see the same trace & assertion.
> > >
> > > Some updates here, I've got it reproduced, somehow a corner case ends up
> > > with a inline file extent following by some pre-alloc extents, along the
> > > way, isize also got updated unexpectedly. Will try to narrow it down.
> > >
> >
> > I realized that btrfs now could tolerate files that mix inline extents with
> > regular extents, so we don't need this ASSERT() anymore, will send a patch
> to
> > remove it.
>
> note that as well as the assertion trigger, it's always immediately
> followed by kernel BUG at fs/btrfs/ctree.h:3422!
I think it's because we do ASSERT() like,
#ifdef CONFIG_BTRFS_ASSERT
__cold
static inline void assfail(char *expr, char *file, int line)
{
pr_err("assertion failed: %s, file: %s, line: %d\n",
expr, file, line);
BUG();
}
#define ASSERT(expr) \
(likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
#else
#define ASSERT(expr) ((void)0)
#endif
Thanks,
-liubo
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