On Sun, Feb 02, 2020 at 02:19:18PM +0100, Daniel Vetter wrote:
On Fri, Jan 31, 2020 at 11:28 PM syzbot syzbot+0dc4444774d419e916c8@syzkaller.appspotmail.com wrote:
Hello,
syzbot found the following crash on:
HEAD commit: 39bed42d Merge tag 'for-linus-hmm' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=179465bee00000 kernel config: https://syzkaller.appspot.com/x/.config?x=2646535f8818ae25 dashboard link: https://syzkaller.appspot.com/bug?extid=0dc4444774d419e916c8 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16251279e00000
The bug was bisected to:
commit 7611750784664db46d0db95631e322aeb263dde7 Author: Alex Deucher alexander.deucher@amd.com Date: Wed Jun 21 16:31:41 2017 +0000
drm/amdgpu: use kernel is_power_of_2 rather than local versionbisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11628df1e00000 final crash: https://syzkaller.appspot.com/x/report.txt?x=13628df1e00000 console output: https://syzkaller.appspot.com/x/log.txt?x=15628df1e00000
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+0dc4444774d419e916c8@syzkaller.appspotmail.com Fixes: 761175078466 ("drm/amdgpu: use kernel is_power_of_2 rather than local version")
Aside: This bisect line is complete nonsense ... I'm kinda at the point where I'm assuming that syzbot bisect results are garbage, which is maybe not what we want. I guess much stricter filtering for noise is needed, dunno. -Danile
With race conditions the git bisect is often nonsense.
regards, dan carpenter