Messages in this thread | | | From | Dmitry Vyukov <> | Date | Fri, 17 Feb 2023 10:05:52 +0100 | Subject | Re: [syzbot] WARNING: can't access registers at entry_SYSCALL_64_after_hwframe |
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On Thu, 16 Feb 2023 at 21:26, Josh Poimboeuf <jpoimboe@kernel.org> wrote: > > > > > > > > Hello, > > > > > > > > syzbot found the following issue on: > > > > > > > > HEAD commit: 9d9019bcea1a Add linux-next specific files for 20230215 > > > > git tree: linux-next > > > > console output: https://syzkaller.appspot.com/x/log.txt?x=144edcc8c80000 > > > > kernel config: https://syzkaller.appspot.com/x/.config?x=a64cbb8ad0da425e > > > > dashboard link: https://syzkaller.appspot.com/bug?extid=dac365e3ce07c3d0e496 > > > > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > > > > > > > > Unfortunately, I don't have any reproducer for this issue yet. > > > > > > > > Downloadable assets: > > > > disk image: https://storage.googleapis.com/syzbot-assets/70f0c6bb5351/disk-9d9019bc.raw.xz > > > > vmlinux: https://storage.googleapis.com/syzbot-assets/7eed8686df34/vmlinux-9d9019bc.xz > > > > kernel image: https://storage.googleapis.com/syzbot-assets/84bb6da6b00e/bzImage-9d9019bc.xz > > > > > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > > > Reported-by: syzbot+dac365e3ce07c3d0e496@syzkaller.appspotmail.com > > > > > > > > WARNING: can't access registers at entry_SYSCALL_64_after_hwframe+0x63/0xcd > > > > > > > > > This is another splat of reports we started getting recently. Looks > > > like this may be ORC unwinder related as well. > > > > Yeah... Also: > > > > https://lkml.kernel.org/lkml/202302161616.85f13863-oliver.sang@intel.com > > https://lkml.kernel.org/lkml/CACT4Y+YzZb2vscjBLiJ-p-ghbu77o851gbESfE=nZebXqfgE4g@mail.gmail.com > > > > The problem seems to be commit ffb1b4a41016 ("x86/unwind/orc: Add > > 'signal' field to ORC metadata") but right now I don't know why. > > Ah, figured it out: > > $ tools/objtool/objtool --dump=orc vmlinux |grep signal:1 |wc -l > 0 > > The 'signal' bit isn't getting propagated from the unwind hints to the > ORC entries :-( > > Will post a fix shortly.
Thanks for the quick fix!
Let's tell syzbot:
#syz fix: objtool: Fix ORC 'signal' propagation
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