Hi Jia-Ju, Thanks for your report. :)
On 2017/12/12 8:59, Jia-Ju Bai wrote: > According to fs/f2fs/trace.c, the kernel module may sleep under a spinlock. > The function call path is: > f2fs_trace_pid (acquire the spinlock) > f2fs_radix_tree_insert > cond_resched --> may sleep > > I do not find a good way to fix it, so I only report. > This possible bug is found by my static analysis tool (DSAC) and my code > review. That's a known issue, and there are other problems in IO trace related codes, so I want to refactor the code directly, you could check the code in below link: https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git/commit/?h=f2fs-dev&id=d895154be1733e2bd29c9e64b57e4e201f0e8a0c But the patch still needs debugging so far. Since the IO trace feature is off by default, I expect the impaction is limited, so I pend the debug job on this patch. Anyway, I think this issue you reported should be fixed first, let me make the fixing part independent from original patch for fixing. Thanks, > > > Thanks, > Jia-Ju Bai > >
