Messages in this thread | | | Date | Sat, 17 Oct 2020 20:06:51 +0900 | From | "Dae R. Jeong" <> | Subject | WARNING in md_ioctl |
| |
Hi,
I looked into the warning "WARNING in md_ioctl" found by Syzkaller. (https://syzkaller.appspot.com/bug?id=fbf9eaea2e65bfcabb4e2750c3ab0892867edea1) I suspect that it is caused by a race between two concurrenct ioctl()s as belows.
CPU1 (md_ioctl()) CPU2 (md_ioctl()) ------ ------ set_bit(MD_CLOSING, &mddev->flags); did_set_md_closing = true; WARN_ON_ONCE(test_bit(MD_CLOSING, &mddev->flags));
if(did_set_md_closing) clear_bit(MD_CLOSING, &mddev->flags);
If the above is correct, this warning is introduced in the commit 065e519e("md: MD_CLOSING needs to be cleared after called md_set_readonly or do_md_stop"). Could you please take a look into this?
Best regards, Dae R. Jeong
| |