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Subject[syzbot] WARNING in vivid_cap_update_frame_period
From
Hello,

syzbot found the following issue on:

HEAD commit: 66f4beaa6c1d Merge branch 'linus' of git://git.kernel.org/..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14f43b9eb00000
kernel config: https://syzkaller.appspot.com/x/.config?x=a262045c4c15a9e0
dashboard link: https://syzkaller.appspot.com/bug?extid=8e740e8a74e295b37726
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

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+8e740e8a74e295b37726@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 1 PID: 29933 at drivers/media/test-drivers/vivid/vivid-kthread-cap.c:664 vivid_cap_update_frame_period+0x16d/0x1f0 drivers/media/test-drivers/vivid/vivid-kthread-cap.c:664
Modules linked in:
CPU: 1 PID: 29933 Comm: vivid-001-vid-c Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:vivid_cap_update_frame_period+0x16d/0x1f0 drivers/media/test-drivers/vivid/vivid-kthread-cap.c:664
Code: 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 79 48 89 ab d8 a0 00 00 48 83 c4 08 5b 5d 41 5c 41 5d c3 e8 e3 bf 4d fb <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 0f b6 14
RSP: 0018:ffffc90017c37e48 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff8881489b0000 RCX: 0000000000000000
RDX: ffff88807d831d00 RSI: ffffffff862a068d RDI: 0000000000000003
RBP: 000000a336db2200 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff862a05a9 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8881489b9344 R14: ffff8881489b0000 R15: ffff8881489b0000
FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555556fb1708 CR3: 000000006ff99000 CR4: 00000000003526e0
Call Trace:
<TASK>
vivid_thread_vid_cap+0x1ab/0xaf0 drivers/media/test-drivers/vivid/vivid-kthread-cap.c:816
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 29933 Comm: vivid-001-vid-c Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
panic+0x2b0/0x6dd kernel/panic.c:232
__warn.cold+0x35/0x44 kernel/panic.c:603
report_bug+0x1bd/0x210 lib/bug.c:199
handle_bug+0x3c/0x60 arch/x86/kernel/traps.c:239
exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:259
asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:566
RIP: 0010:vivid_cap_update_frame_period+0x16d/0x1f0 drivers/media/test-drivers/vivid/vivid-kthread-cap.c:664
Code: 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 79 48 89 ab d8 a0 00 00 48 83 c4 08 5b 5d 41 5c 41 5d c3 e8 e3 bf 4d fb <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 0f b6 14
RSP: 0018:ffffc90017c37e48 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff8881489b0000 RCX: 0000000000000000
RDX: ffff88807d831d00 RSI: ffffffff862a068d RDI: 0000000000000003
RBP: 000000a336db2200 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff862a05a9 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8881489b9344 R14: ffff8881489b0000 R15: ffff8881489b0000
vivid_thread_vid_cap+0x1ab/0xaf0 drivers/media/test-drivers/vivid/vivid-kthread-cap.c:816
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

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