On Sun, Jan 6, 2019 at 3:37 PM Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx> wrote: > > 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. #syz dup: kernel panic: stack is corrupted in udp4_lib_lookup2
