On 2019/01/06 22:48, Dmitry Vyukov wrote: > On Sun, Jan 6, 2019 at 2:31 PM syzbot > <syzbot+05fc3a636f5ee8830a99@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: >> >> Hello, >> >> syzbot found the following crash on: >> >> HEAD commit: 3fed6ae4b027 ia64: fix compile without swiotlb >> git tree: upstream >> console output: https://syzkaller.appspot.com/x/log.txt?x=161ce1d7400000 >> kernel config: https://syzkaller.appspot.com/x/.config?x=7308e68273924137 >> dashboard link: https://syzkaller.appspot.com/bug?extid=05fc3a636f5ee8830a99 >> compiler: gcc (GCC) 9.0.0 20181231 (experimental) >> userspace arch: i386 >> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10b3769f400000 >> >> IMPORTANT: if you fix the bug, please add the following tag to the commit: >> Reported-by: syzbot+05fc3a636f5ee8830a99@xxxxxxxxxxxxxxxxxxxxxxxxx > > I suspect this is another incarnation of: > https://syzkaller.appspot.com/bug?id=4821de869e3d78a255a034bf212a4e009f6125a7 > Any other ideas? >> CPU: 0 PID: -1455013312 Comm: Not tainted 4.20.0+ #10 "current->pid < 0" suggests that "struct task_struct" was overwritten. >> #PF error: [normal kernel read fault] >> Thread overran stack, or stack corrupted And "struct task_struct" might be overwritten by stack overrun? The cause of overrun is unknown, but given that "fou6: Prevent unbounded recursion in GUE error handler" is not yet applied to linux.git tree, this might be a dup of that bug.
