syzbot


BUG: unable to handle kernel paging request in vga16fb_fillrect (2)
Status: auto-closed as invalid on 2022/02/20 19:10
Reported-by: syzbot+c5b0f19e22d4cb261aa4@syzkaller.appspotmail.com
First crash: 195d, last: 186d
similar bugs (4):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 BUG: unable to handle kernel paging request in vga16fb_fillrect (2) C error 1 53d 264d 0/1 upstream: reported C repro on 2021/09/05 18:24
upstream BUG: unable to handle kernel paging request in vga16fb_fillrect C inconclusive 14 201d 317d 22/22 fixed on 2021/11/10 00:50
linux-4.19 BUG: unable to handle kernel paging request in vga16fb_fillrect C error 3 88d 314d 0/1 upstream: reported C repro on 2021/07/17 15:13
linux-4.14 BUG: unable to handle kernel paging request in vga16fb_fillrect 1 892d 892d 0/1 auto-closed as invalid on 2020/04/15 20:20

Sample crash report:
BUG: unable to handle page fault for address: ffff888001000018
#PF: supervisor write access in kernel mode
#PF: error_code(0x0003) - permissions violation
PGD 11201067 P4D 11201067 PUD 11202067 PMD 80000000010001e1 
Oops: 0003 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 779 Comm: syz-executor.2 Not tainted 5.16.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:writeb arch/x86/include/asm/io.h:65 [inline]
RIP: 0010:vga16fb_fillrect+0x17b0/0x1c10 drivers/video/fbdev/vga16fb.c:923
Code: 00 00 31 ed 31 ff 89 de e8 7d 52 16 fd 4c 63 64 24 08 44 8d 7b ff ff 4c 24 04 85 db 74 33 44 89 fb 66 0f 1f 84 00 00 00 00 00 <41> 88 2e 85 db 74 0c 49 ff c6 e8 41 4e 16 fd ff cb eb ed e8 38 4e
RSP: 0018:ffffc900173ff808 EFLAGS: 00010206
RAX: ffffffff846e298b RBX: 0000000000000077 RCX: 0000000000040000
RDX: ffffc9000d78a000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: 0000000000000000 R08: ffffffff846e2933 R09: ffffffff846e1a38
R10: 0000000000000002 R11: ffff888015dd3a00 R12: 0000000000000050
R13: 0000000000000078 R14: ffff888001000018 R15: 0000000000000077
FS:  00007f3ebed2b700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff888001000018 CR3: 00000000356f8000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bit_clear_margins+0x2d7/0x6e0 drivers/video/fbdev/core/bitblit.c:209
 fbcon_clear_margins drivers/video/fbdev/core/fbcon.c:1296 [inline]
 fbcon_switch+0x1569/0x21f0 drivers/video/fbdev/core/fbcon.c:1677
 redraw_screen+0x53d/0x1280 drivers/tty/vt/vt.c:1021
 do_fb_ioctl+0x7f2/0x900 drivers/video/fbdev/core/fbmem.c:1114
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f3ec17b5ae9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3ebed2b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f3ec18c8f60 RCX: 00007f3ec17b5ae9
RDX: 00000000200002c0 RSI: 0000000000004601 RDI: 0000000000000003
RBP: 00007f3ec180ff6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcd348052f R14: 00007f3ebed2b300 R15: 0000000000022000
 </TASK>
Modules linked in:
CR2: ffff888001000018
---[ end trace 12d4f75ba6e34a88 ]---
RIP: 0010:writeb arch/x86/include/asm/io.h:65 [inline]
RIP: 0010:vga16fb_fillrect+0x17b0/0x1c10 drivers/video/fbdev/vga16fb.c:923
Code: 00 00 31 ed 31 ff 89 de e8 7d 52 16 fd 4c 63 64 24 08 44 8d 7b ff ff 4c 24 04 85 db 74 33 44 89 fb 66 0f 1f 84 00 00 00 00 00 <41> 88 2e 85 db 74 0c 49 ff c6 e8 41 4e 16 fd ff cb eb ed e8 38 4e
RSP: 0018:ffffc900173ff808 EFLAGS: 00010206
RAX: ffffffff846e298b RBX: 0000000000000077 RCX: 0000000000040000
RDX: ffffc9000d78a000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: 0000000000000000 R08: ffffffff846e2933 R09: ffffffff846e1a38
R10: 0000000000000002 R11: ffff888015dd3a00 R12: 0000000000000050
R13: 0000000000000078 R14: ffff888001000018 R15: 0000000000000077
FS:  00007f3ebed2b700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff888001000018 CR3: 00000000356f8000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	31 ed                	xor    %ebp,%ebp
   4:	31 ff                	xor    %edi,%edi
   6:	89 de                	mov    %ebx,%esi
   8:	e8 7d 52 16 fd       	callq  0xfd16528a
   d:	4c 63 64 24 08       	movslq 0x8(%rsp),%r12
  12:	44 8d 7b ff          	lea    -0x1(%rbx),%r15d
  16:	ff 4c 24 04          	decl   0x4(%rsp)
  1a:	85 db                	test   %ebx,%ebx
  1c:	74 33                	je     0x51
  1e:	44 89 fb             	mov    %r15d,%ebx
  21:	66 0f 1f 84 00 00 00 	nopw   0x0(%rax,%rax,1)
  28:	00 00
* 2a:	41 88 2e             	mov    %bpl,(%r14) <-- trapping instruction
  2d:	85 db                	test   %ebx,%ebx
  2f:	74 0c                	je     0x3d
  31:	49 ff c6             	inc    %r14
  34:	e8 41 4e 16 fd       	callq  0xfd164e7a
  39:	ff cb                	dec    %ebx
  3b:	eb ed                	jmp    0x2a
  3d:	e8                   	.byte 0xe8
  3e:	38                   	.byte 0x38
  3f:	4e                   	rex.WRX

Crashes (4):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-smack-root 2021/11/22 19:10 upstream 136057256686 545ab074 .config log report info BUG: unable to handle kernel paging request in vga16fb_fillrect
ci-upstream-kasan-gce-smack-root 2021/11/17 05:07 upstream 8ab774587903 cafff8b6 .config log report info BUG: unable to handle kernel paging request in vga16fb_fillrect
ci-upstream-kasan-gce-selinux-root 2021/11/14 18:25 upstream c8c109546a19 83f5c9b5 .config log report info BUG: unable to handle kernel paging request in vga16fb_fillrect
ci-upstream-kasan-gce-smack-root 2021/11/13 08:39 upstream 7246f4dcaccc 83f5c9b5 .config log report info BUG: unable to handle kernel paging request in vga16fb_fillrect