On Wed, Jul 4, 2018 at 5:20 PM, Thomas Gleixner <[email protected]> wrote: > On Wed, 4 Jul 2018, syzbot wrote: > >> Hello, >> >> syzbot found the following crash on: >> >> HEAD commit: 2bdea157b999 Merge branch 'sctp-fully-support-for-dscp-and.. >> git tree: bpf-next >> console output: https://syzkaller.appspot.com/x/log.txt?x=14339f42400000 >> kernel config: https://syzkaller.appspot.com/x/.config?x=f62553dc846b0692 >> dashboard link: https://syzkaller.appspot.com/bug?extid=7f73a81393d3b3777fb0 >> compiler: gcc (GCC) 8.0.1 20180413 (experimental) >> >> Unfortunately, I don't have any reproducer for this crash yet. >> >> IMPORTANT: if you fix the bug, please add the following tag to the commit: >> Reported-by: [email protected] >> >> ================================================================== >> BUG: KASAN: use-after-scope in lookup_object lib/debugobjects.c:157 [inline] >> BUG: KASAN: use-after-scope in debug_object_deactivate+0x425/0x450 >> lib/debugobjects.c:540 >> Read of size 8 at addr ffff88019d1a5ec0 by task syz-executor3/13445 > > I don't see how lib/debugobjects.c:157 would be a valid use after scope > issue. The one in line 540 makes no sense either.
Hi Thomas, They all don't make sense: https://groups.google.com/d/msg/syzkaller-bugs/A-S5Rfn5bwQ/dFvmNcmyAAAJ One of them says "stack overflow", so there seems to be a serious system corruption that now leads to assorted nonsensical crashes. And this seems to be a very recent change.
