Messages in this thread | | | Date | Wed, 8 Nov 2017 00:07:35 +0800 | From | Fengguang Wu <> | Subject | Re: [inotify_read] BUG: unable to handle kernel paging request at ffff8800172f8000 |
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On Tue, Nov 07, 2017 at 07:51:00AM -0800, Linus Torvalds wrote: >On Tue, Nov 7, 2017 at 2:28 AM, Fengguang Wu <fengguang.wu@intel.com> wrote: >> FYI This bug trace also contains inotify_read(). >> >> [ 3.365745] BUG: unable to handle kernel paging request at ffff8800172f8000 >> [ 3.366661] IP: slob_free+0x1c4/0x276 >> [ 3.373500] RBP: ffff8800172f7ffe > >Same gcc bug: it's a 2-byte read from the end of the page that has >been turned by gcc into a 4-byte read, and causes an oops because your >gcc version is bad. > >I *think* it's triggered by CONFIG_OPTIMIZE_FOR_SIZE=y, which causes >gcc to generate garbage code. Yes, the 32-bit read is one byte shorter >because it doesn't have a operand size prefix, but it's buggy.
I'll try disabling CONFIG_OPTIMIZE_FOR_SIZE for gcc 4.x.
Thanks, Fengguang
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