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WARNING: fbcon: Driver 'vkmsdrmfb' missed to adjust virtual screen size (0x0 vs. 64x768)

Status: fixed on 2023/06/08 14:41
Reported-by: syzbot+20dcf81733d43ddff661@syzkaller.appspotmail.com
Fix commit: 1935f0deb611 drm/fb-helper: set x/yres_virtual in drm_fb_helper_check_var
First crash: 869d, last: 867d
Cause bisection: introduced by (bisect log) [merge commit]:
commit b1c428b6c3684ee8ddf4137d68b3e8d51d2a700f
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date: Sat Jul 9 18:20:15 2022 +0000

  Merge tag 'i2c-for-5.19-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

Crash: WARNING: fbcon: Driver 'vkmsdrmfb' missed to adjust virtual screenx0 vs. 64x768) (log)
Repro: C syz .config
  
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Discussions (3)
Title Replies (including bot) Last reply
[PATCH] fbdev: Don't spam dmesg on bad userspace ioctl input 13 (13) 2023/04/11 17:44
[PATCH 1/3] drm/fb-helper: set x/yres_virtual in drm_fb_helper_check_var 13 (13) 2023/04/05 21:09
[syzbot] WARNING: fbcon: Driver 'vkmsdrmfb' missed to adjust virtual screen size (0x0 vs. 64x768) 0 (1) 2022/07/11 06:41
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2023/01/27 02:32 27m retest repro upstream OK log
2023/01/27 02:32 24m retest repro upstream OK log
2022/10/19 06:30 18m retest repro upstream error
2022/10/19 04:30 17m retest repro upstream error
2022/10/19 02:30 18m retest repro upstream error
2022/10/19 00:30 18m retest repro upstream error
2022/10/19 00:30 17m retest repro upstream error
2022/10/19 00:30 17m retest repro upstream error
2022/10/19 00:30 18m retest repro upstream error
2022/10/19 00:30 31m retest repro upstream OK log

Sample crash report:
WARNING: fbcon: Driver 'vkmsdrmfb' missed to adjust virtual screen size (0x0 vs. 64x768)

Crashes (24):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/07/10 11:11 upstream b1c428b6c368 b5765a15 .config strace log report syz C ci-upstream-kasan-gce WARNING: fbcon: Driver 'vkmsdrmfb' missed to adjust virtual screen size (0x0 vs. 64x768)
2022/07/10 05:58 upstream b1c428b6c368 b5765a15 .config strace log report syz C ci-upstream-kasan-gce WARNING: fbcon: Driver 'vkmsdrmfb' missed to adjust virtual screen size (0x0 vs. 64x768)
2022/07/09 21:55 upstream e5524c2a1fc4 b5765a15 .config strace log report syz C ci-upstream-kasan-gce WARNING: fbcon: Driver 'vkmsdrmfb' missed to adjust virtual screen size (0x0 vs. 64x768)
2022/07/09 02:49 upstream a471da3100ef b5765a15 .config strace log report syz C ci-upstream-kasan-gce-smack-root WARNING: fbcon: Driver 'vkmsdrmfb' missed to adjust virtual screen size (0x0 vs. 64x768)
2022/07/09 00:43 upstream a471da3100ef b5765a15 .config strace log report syz C ci-upstream-kasan-gce WARNING: fbcon: Driver 'vkmsdrmfb' missed to adjust virtual screen size (0x0 vs. 64x768)
2022/07/09 08:17 upstream a471da3100ef b5765a15 .config console log report syz C ci-qemu-upstream WARNING: fbcon: Driver 'vkmsdrmfb' missed to adjust virtual screen size (0x0 vs. 64x768)
2022/07/09 04:07 upstream a471da3100ef b5765a15 .config strace log report syz C ci-upstream-kasan-gce-selinux-root WARNING: fbcon: Driver 'vkmsdrmfb' missed to adjust virtual screen size (0x0 vs. 64x768)
2022/07/09 02:33 upstream a471da3100ef b5765a15 .config strace log report syz C ci-upstream-kasan-gce-root WARNING: fbcon: Driver 'vkmsdrmfb' missed to adjust virtual screen size (0x0 vs. 64x768)
2022/07/09 13:52 upstream e5524c2a1fc4 b5765a15 .config console log report info ci-upstream-kasan-gce-selinux-root WARNING: fbcon: Driver 'vkmsdrmfb' missed to adjust virtual screen size (0x0 vs. 64x768)
2022/07/09 13:34 upstream e5524c2a1fc4 b5765a15 .config console log report info ci-upstream-kasan-gce-smack-root WARNING: fbcon: Driver 'vkmsdrmfb' missed to adjust virtual screen size (0x0 vs. 64x768)
2022/07/09 12:34 upstream e5524c2a1fc4 b5765a15 .config console log report info ci-upstream-kasan-gce WARNING: fbcon: Driver 'vkmsdrmfb' missed to adjust virtual screen size (0x0 vs. 64x768)
2022/07/09 09:45 upstream e5524c2a1fc4 b5765a15 .config console log report info ci-upstream-kasan-gce WARNING: fbcon: Driver 'vkmsdrmfb' missed to adjust virtual screen size (0x0 vs. 64x768)
2022/07/08 23:32 upstream a471da3100ef b5765a15 .config console log report info ci-upstream-kasan-gce-smack-root WARNING: fbcon: Driver 'vkmsdrmfb' missed to adjust virtual screen size (0x0 vs. 64x768)
2022/07/08 23:18 upstream a471da3100ef b5765a15 .config console log report info ci-upstream-kasan-gce-selinux-root WARNING: fbcon: Driver 'vkmsdrmfb' missed to adjust virtual screen size (0x0 vs. 64x768)
2022/07/08 22:46 upstream a471da3100ef b5765a15 .config console log report info ci-upstream-kasan-gce WARNING: fbcon: Driver 'vkmsdrmfb' missed to adjust virtual screen size (0x0 vs. 64x768)
2022/07/08 21:32 upstream a471da3100ef b5765a15 .config console log report info ci-upstream-kasan-gce-root WARNING: fbcon: Driver 'vkmsdrmfb' missed to adjust virtual screen size (0x0 vs. 64x768)
2022/07/08 21:21 upstream a471da3100ef b5765a15 .config console log report info ci-upstream-kasan-gce WARNING: fbcon: Driver 'vkmsdrmfb' missed to adjust virtual screen size (0x0 vs. 64x768)
2022/07/08 20:51 upstream a471da3100ef b5765a15 .config console log report info ci-qemu-upstream WARNING: fbcon: Driver 'vkmsdrmfb' missed to adjust virtual screen size (0x0 vs. 64x768)
2022/07/08 20:09 upstream a471da3100ef 8442e655 .config console log report info ci-qemu-upstream WARNING: fbcon: Driver 'vkmsdrmfb' missed to adjust virtual screen size (0x0 vs. 64x768)
2022/07/08 19:55 upstream a471da3100ef b5765a15 .config console log report info ci-upstream-kasan-gce-selinux-root WARNING: fbcon: Driver 'vkmsdrmfb' missed to adjust virtual screen size (0x0 vs. 64x768)
2022/07/08 18:58 upstream a471da3100ef b5765a15 .config console log report info ci-upstream-kasan-gce-root WARNING: fbcon: Driver 'vkmsdrmfb' missed to adjust virtual screen size (0x0 vs. 64x768)
2022/07/11 00:05 upstream d9919d43cbf6 b5765a15 .config console log report info ci-qemu-upstream-386 WARNING: fbcon: Driver 'vkmsdrmfb' missed to adjust virtual screen size (0x0 vs. 64x768)
2022/07/09 16:06 upstream e5524c2a1fc4 b5765a15 .config console log report info ci-qemu-upstream-386 WARNING: fbcon: Driver 'vkmsdrmfb' missed to adjust virtual screen size (0x0 vs. 64x768)
2022/07/09 16:06 upstream e5524c2a1fc4 b5765a15 .config console log report info ci-qemu-upstream-386 WARNING: fbcon: Driver 'vkmsdrmfb' missed to adjust virtual screen size (0x0 vs. 64x768)
* Struck through repros no longer work on HEAD.