On Thu, Dec 5, 2019 at 3:05 PM Daniel Vetter daniel.vetter@ffwll.ch wrote:
On Thu, Dec 5, 2019 at 2:38 PM syzbot syzbot+a4ae1442ccc637162dc1@syzkaller.appspotmail.com wrote:
syzbot has bisected this bug to:
commit 979c11ef39cee79d6f556091a357890962be2580 Author: Ayan Kumar Halder ayan.halder@arm.com Date: Tue Jul 17 17:13:46 2018 +0000
drm/sun4i: Substitute sun4i_backend_format_is_yuv() with format->is_yuvPretty sure your GCD machine is not using the sun4i driver. It's also very far away from the code that's blowing up. bisect gone wrong? -Daniel
Yes, this driver is not even enabled in the config. I see 2 issues with kernel in the bisect log: 1. Unrelated machine hangs get in the way of bisection process (or that "no output" another manifestation of this bug?). 2. Somehow this change to not compiled file changed vmlinux thus detection of unrelated changes failed. Non-deterministic kernel builds issue is tracked here: https://github.com/google/syzkaller/issues/1271#issuecomment-559093018 but so far I don't have any glues/ideas.
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15d2f97ee00000 start commit: 596cf45c Merge branch 'akpm' (patches from Andrew) git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13d2f97ee00000 kernel config: https://syzkaller.appspot.com/x/.config?x=7d8ab2e0e09c2a82 dashboard link: https://syzkaller.appspot.com/bug?extid=a4ae1442ccc637162dc1 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14273edae00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15e7677ae00000
Reported-by: syzbot+a4ae1442ccc637162dc1@syzkaller.appspotmail.com Fixes: 979c11ef39ce ("drm/sun4i: Substitute sun4i_backend_format_is_yuv() with format->is_yuv")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
-- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch
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