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Message-ID: <000000000000bf0b1f060a2d9bea@google.com>
Date: Wed, 15 Nov 2023 01:34:22 -0800
From: syzbot <syzbot+2e93e6fb36e6fdc56574@...kaller.appspotmail.com>
To: airlied@...il.com, airlied@...ux.ie, daniel.vetter@...ll.ch,
daniel.vetter@...el.com, daniel@...ll.ch,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
maarten.lankhorst@...ux.intel.com, melissa.srw@...il.com,
mripard@...nel.org, syzkaller-bugs@...glegroups.com,
tzimmermann@...e.de
Subject: [syzbot] [dri?] divide error in drm_mode_debug_printmodeline
Hello,
syzbot found the following issue on:
HEAD commit: ac347a0655db Merge tag 'arm64-fixes' of git://git.kernel.o..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=101ba588e80000
kernel config: https://syzkaller.appspot.com/x/.config?x=88e7ba51eecd9cd6
dashboard link: https://syzkaller.appspot.com/bug?extid=2e93e6fb36e6fdc56574
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11252f97680000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10fd2498e80000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/8fcb90d89768/disk-ac347a06.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/360d9341a71c/vmlinux-ac347a06.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a370aa406c63/bzImage-ac347a06.xz
The issue was bisected to:
commit ea40d7857d5250e5400f38c69ef9e17321e9c4a2
Author: Daniel Vetter <daniel.vetter@...ll.ch>
Date: Fri Oct 9 23:21:56 2020 +0000
drm/vkms: fbdev emulation support
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1058223f680000
final oops: https://syzkaller.appspot.com/x/report.txt?x=1258223f680000
console output: https://syzkaller.appspot.com/x/log.txt?x=1458223f680000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2e93e6fb36e6fdc56574@...kaller.appspotmail.com
Fixes: ea40d7857d52 ("drm/vkms: fbdev emulation support")
divide error: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 5068 Comm: syz-executor357 Not tainted 6.6.0-syzkaller-16039-gac347a0655db #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
RIP: 0010:drm_mode_vrefresh drivers/gpu/drm/drm_modes.c:1303 [inline]
RIP: 0010:drm_mode_debug_printmodeline+0x118/0x4e0 drivers/gpu/drm/drm_modes.c:60
Code: 00 41 0f b7 07 66 83 f8 02 b9 01 00 00 00 0f 43 c8 0f b7 c1 0f af e8 44 89 f0 48 69 c8 e8 03 00 00 89 e8 d1 e8 48 01 c8 31 d2 <48> f7 f5 49 89 c6 eb 0c e8 fb 07 66 fc eb 05 e8 f4 07 66 fc 48 89
RSP: 0018:ffffc9000391f8d0 EFLAGS: 00010246
RAX: 000000000001f400 RBX: ffff888025045000 RCX: 000000000001f400
RDX: 0000000000000000 RSI: 0000000000008000 RDI: ffff888025045018
RBP: 0000000000000000 R08: ffffffff8528b9af R09: 0000000000000000
R10: ffffc9000391f8a0 R11: fffff52000723f17 R12: 0000000000000080
R13: dffffc0000000000 R14: 0000000000000080 R15: ffff888025045016
FS: 0000555556932380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000005fdeb8 CR3: 000000007fcff000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
drm_mode_setcrtc+0x83b/0x1880 drivers/gpu/drm/drm_crtc.c:794
drm_ioctl_kernel+0x362/0x500 drivers/gpu/drm/drm_ioctl.c:792
drm_ioctl+0x636/0xb00 drivers/gpu/drm/drm_ioctl.c:895
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl+0xf8/0x170 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f6c63dd6729
Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffcde0dd0e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffcde0dd2b8 RCX: 00007f6c63dd6729
RDX: 0000000020000180 RSI: 00000000c06864a2 RDI: 0000000000000003
RBP: 00007f6c63e49610 R08: 00000000fffff4e6 R09: 00007ffcde0dd2b8
R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffcde0dd2a8 R14: 0000000000000001 R15: 0000000000000001
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:drm_mode_vrefresh drivers/gpu/drm/drm_modes.c:1303 [inline]
RIP: 0010:drm_mode_debug_printmodeline+0x118/0x4e0 drivers/gpu/drm/drm_modes.c:60
Code: 00 41 0f b7 07 66 83 f8 02 b9 01 00 00 00 0f 43 c8 0f b7 c1 0f af e8 44 89 f0 48 69 c8 e8 03 00 00 89 e8 d1 e8 48 01 c8 31 d2 <48> f7 f5 49 89 c6 eb 0c e8 fb 07 66 fc eb 05 e8 f4 07 66 fc 48 89
RSP: 0018:ffffc9000391f8d0 EFLAGS: 00010246
RAX: 000000000001f400 RBX: ffff888025045000 RCX: 000000000001f400
RDX: 0000000000000000 RSI: 0000000000008000 RDI: ffff888025045018
RBP: 0000000000000000 R08: ffffffff8528b9af R09: 0000000000000000
R10: ffffc9000391f8a0 R11: fffff52000723f17 R12: 0000000000000080
R13: dffffc0000000000 R14: 0000000000000080 R15: ffff888025045016
FS: 0000555556932380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000064392c CR3: 000000007fcff000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 00 41 0f add %al,0xf(%rcx)
3: b7 07 mov $0x7,%bh
5: 66 83 f8 02 cmp $0x2,%ax
9: b9 01 00 00 00 mov $0x1,%ecx
e: 0f 43 c8 cmovae %eax,%ecx
11: 0f b7 c1 movzwl %cx,%eax
14: 0f af e8 imul %eax,%ebp
17: 44 89 f0 mov %r14d,%eax
1a: 48 69 c8 e8 03 00 00 imul $0x3e8,%rax,%rcx
21: 89 e8 mov %ebp,%eax
23: d1 e8 shr %eax
25: 48 01 c8 add %rcx,%rax
28: 31 d2 xor %edx,%edx
* 2a: 48 f7 f5 div %rbp <-- trapping instruction
2d: 49 89 c6 mov %rax,%r14
30: eb 0c jmp 0x3e
32: e8 fb 07 66 fc call 0xfc660832
37: eb 05 jmp 0x3e
39: e8 f4 07 66 fc call 0xfc660832
3e: 48 rex.W
3f: 89 .byte 0x89
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
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