[trimmed down ridiculous Cc list] On Tue, Nov 05, 2019 at 03:52:08PM -0800, syzbot wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: 51309b9d Add linux-next specific files for 20191105 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=11ad1658e00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=a9b1a641c1f1fc52 > dashboard link: https://syzkaller.appspot.com/bug?extid=a0fc447639c6ffa66b59 > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=164e5f92e00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15c65bcce00000 > > The bug was bisected to: > > commit 181be542ef3c9ca495500143d4c23f4d58beb5ab > Author: Steven Price <steven.price@xxxxxxx> > Date: Mon Nov 4 22:57:54 2019 +0000 > > mm: pagewalk: allow walking without vma > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11341968e00000 > final crash: https://syzkaller.appspot.com/x/report.txt?x=13341968e00000 > console output: https://syzkaller.appspot.com/x/log.txt?x=15341968e00000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+a0fc447639c6ffa66b59@xxxxxxxxxxxxxxxxxxxxxxxxx > Fixes: 181be542ef3c ("mm: pagewalk: allow walking without vma") > > kasan: CONFIG_KASAN_INLINE enabled > kasan: GPF could be caused by NULL-ptr deref or user memory access > general protection fault: 0000 [#1] PREEMPT SMP KASAN > CPU: 0 PID: 8839 Comm: syz-executor009 Not tainted 5.4.0-rc6-next-20191105 > #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > RIP: 0010:pmd_trans_huge_lock include/linux/huge_mm.h:219 [inline] > RIP: 0010:pagemap_pmd_range+0x83/0x1e40 fs/proc/task_mmu.c:1373 >From some quick tests, this seems to have been fixed by mm-pagewalk-allow-walking-without-vma-v15 (http://lkml.kernel.org/r/20191101140942.51554-13-steven.price@xxxxxxx). And it's consistent with syzbot last seeing this crash on next-20191105. As this fix will be folded in, let's invalidate this syzbot bug report: #syz invalid
