[syzbot] WARNING in drm_wait_one_vblank

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: d2b6f8a1 Merge tag 'xfs-5.13-merge-3' of git://git.kernel...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12c5b2c3d00000
kernel config: https://syzkaller.appspot.com/x/.config?x=65c207250bba4efe
dashboard link: https://syzkaller.appspot.com/bug?extid=6f7fe2dbc479dca0ed17

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6f7fe2...@syzkaller.appspotmail.com

------------[ cut here ]------------
platform vkms: vblank wait timed out on crtc 0
WARNING: CPU: 0 PID: 11785 at drivers/gpu/drm/drm_vblank.c:1269 drm_wait_one_vblank+0x2be/0x500 drivers/gpu/drm/drm_vblank.c:1269
Modules linked in:
CPU: 0 PID: 11785 Comm: syz-executor.0 Not tainted 5.12.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:drm_wait_one_vblank+0x2be/0x500 drivers/gpu/drm/drm_vblank.c:1269
Code: 85 f6 0f 84 a3 01 00 00 e8 6f f0 32 fd 4c 89 ef e8 97 68 13 00 44 89 e1 4c 89 f2 48 c7 c7 e0 eb d6 89 48 89 c6 e8 57 35 86 04 <0f> 0b e9 87 fe ff ff e8 46 f0 32 fd 31 ff 4c 89 ee e8 5c f8 32 fd
RSP: 0018:ffffc90008f7fb40 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 00000000000038f8 RCX: 0000000000000000
RDX: 0000000000040000 RSI: ffffffff815c7bd5 RDI: fffff520011eff5a
RBP: ffff8881437b0000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff815c1a3e R11: 0000000000000000 R12: 0000000000000000
R13: ffff88801a1c4010 R14: ffff8880161746b8 R15: ffff888142ddc830
FS: 00007f8eba6e2700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000014a53ad CR3: 0000000021583000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
drm_fb_helper_ioctl+0x159/0x1a0 drivers/gpu/drm/drm_fb_helper.c:1197
do_fb_ioctl+0x1d5/0x690 drivers/video/fbdev/core/fbmem.c:1171
fb_ioctl+0xe7/0x150 drivers/video/fbdev/core/fbmem.c:1185
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:1069 [inline]
__se_sys_ioctl fs/ioctl.c:1055 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:1055
do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665f9
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:00007f8eba6e2188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9
RDX: 0000000000000000 RSI: 0000000040044620 RDI: 0000000000000006
RBP: 00000000004bfce1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 0000000000a9fb1f R14: 00007f8eba6e2300 R15: 0000000000022000


---
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[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 6f513529296f Merge tag 'for-5.16-rc4-tag' of git://git.ker..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16499fc5b00000
kernel config: https://syzkaller.appspot.com/x/.config?x=221ffc09e39ebbd1
dashboard link: https://syzkaller.appspot.com/bug?extid=6f7fe2dbc479dca0ed17
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17ab646db00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17767fc5b00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6f7fe2...@syzkaller.appspotmail.com

platform vkms: vblank wait timed out on crtc 0

WARNING: CPU: 1 PID: 3708 at drivers/gpu/drm/drm_vblank.c:1269 drm_wait_one_vblank+0x2bc/0x500 drivers/gpu/drm/drm_vblank.c:1269
Modules linked in:

CPU: 1 PID: 3708 Comm: syz-executor955 Not tainted 5.16.0-rc4-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011

RIP: 0010:drm_wait_one_vblank+0x2bc/0x500 drivers/gpu/drm/drm_vblank.c:1269
Code: 85 f6 0f 84 a3 01 00 00 e8 11 4c 1a fd 4c 89 ef e8 f9 34 13 00 44 89 e1 4c 89 f2 48 c7 c7 40 7d 1a 8a 48 89 c6 e8 7f 61 a3 04 <0f> 0b e9 87 fe ff ff e8 e8 4b 1a fd 31 ff 4c 89 ee e8 6e 4e 1a fd
RSP: 0018:ffffc9000298fb40 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000596 RCX: 0000000000000000
RDX: ffff8880766f3a00 RSI: ffffffff815f1e08 RDI: fffff52000531f5a
RBP: ffff8881469f4000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff815ebbae R11: 0000000000000000 R12: 0000000000000000
R13: ffff888146e02010 R14: ffff888146cc7500 R15: ffff888146e10030
FS: 00005555572d9300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007fa33cdb0290 CR3: 0000000079034000 CR4: 00000000003506e0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:

<TASK>
drm_fb_helper_ioctl+0x159/0x1a0 drivers/gpu/drm/drm_fb_helper.c:1197
do_fb_ioctl+0x1d5/0x690 drivers/video/fbdev/core/fbmem.c:1175
fb_ioctl+0xe7/0x150 drivers/video/fbdev/core/fbmem.c:1189
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fa33cd3c1c9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc7e8b9d98 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 00007fa33cd3c1c9
RDX: 0000000000000000 RSI: 0000000040044620 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000016e91
R13: 00007ffc7e8b9dac R14: 00007ffc7e8b9dd0 R15: 00007ffc7e8b9dc0
</TASK>

[Siddh Raman Pant]

Test the reproducer on latest.

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in drm_wait_one_vblank

platform vkms: vblank wait timed out on crtc 0

WARNING: CPU: 1 PID: 4329 at drivers/gpu/drm/drm_vblank.c:1269 drm_wait_one_vblank+0x2bc/0x500 drivers/gpu/drm/drm_vblank.c:1269
Modules linked in:

CPU: 1 PID: 4329 Comm: syz-executor.5 Not tainted 6.1.0-rc8-syzkaller-00148-g0d1409e4ff08 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022

RIP: 0010:drm_wait_one_vblank+0x2bc/0x500 drivers/gpu/drm/drm_vblank.c:1269

Code: 85 f6 0f 84 a3 01 00 00 e8 a1 82 03 fd 4c 89 ef e8 19 34 1b 00 44 89 e1 4c 89 f2 48 c7 c7 80 67 5d 8a 48 89 c6 e8 1b 54 d1 04 <0f> 0b e9 87 fe ff ff e8 78 82 03 fd 31 ff 4c 89 ee e8 5e 7f 03 fd
RSP: 0018:ffffc90003887b40 EFLAGS: 00010282

RAX: 0000000000000000 RBX: 000000000000187a RCX: 0000000000000000
RDX: ffff888077e56080 RSI: ffffffff81615618 RDI: fffff52000710f5a
RBP: ffff888146b6c000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88801e146010 R14: ffff888146fb2dc0 R15: ffff888146ffe030
FS: 00007fd446839700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 000055d58fce0300 CR3: 0000000066c1d000 CR4: 00000000003506e0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>

drm_fb_helper_ioctl+0x159/0x1a0 drivers/gpu/drm/drm_fb_helper.c:1259
do_fb_ioctl+0x1d5/0x6e0 drivers/video/fbdev/core/fbmem.c:1188
fb_ioctl+0xe7/0x150 drivers/video/fbdev/core/fbmem.c:1202
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856

do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80

entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fd445689409
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd446839168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd44579bf80 RCX: 00007fd445689409
RDX: 0000000000000000 RSI: 0000000040044620 RDI: 0000000000000003
RBP: 00007fd4468391d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffff493021f R14: 00007fd446839300 R15: 0000000000022000
</TASK>


Tested on:

commit: 0d1409e4 Merge tag 'drm-fixes-2022-12-09' of git://ano..
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=10bf8cb7880000
kernel config: https://syzkaller.appspot.com/x/.config?x=f99d4932d068617a

dashboard link: https://syzkaller.appspot.com/bug?extid=6f7fe2dbc479dca0ed17
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Note: no patches were applied.

[Siddh Raman Pant]

On Fri, 09 Dec 2022 17:41:23 +0530, syzbot wrote

> syzbot has tested the proposed patch but the reproducer is still triggering an issue:

I keep getting "ERROR: Out of memory at tomoyo_realpath_from_path." and
cannot reproduce the crash...

[syzbot]

Auto-closing this bug as obsolete.
No recent activity, existing reproducers are no longer triggering the issue.