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Subject[syzbot] WARNING in drm_prime_destroy_file_private

syzbot found the following issue on:

HEAD commit: ea4424be1688 Merge tag 'mtd/fixes-for-5.17-rc8' of git://g..
git tree: upstream
console output:
kernel config:
dashboard link:
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:

------------[ cut here ]------------
WARNING: CPU: 1 PID: 16791 at drivers/gpu/drm/drm_prime.c:228 drm_prime_destroy_file_private+0x3e/0x50 drivers/gpu/drm/drm_prime.c:228
Modules linked in:
CPU: 1 PID: 16791 Comm: syz-executor.5 Not tainted 5.17.0-rc7-syzkaller-00020-gea4424be1688 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:drm_prime_destroy_file_private+0x3e/0x50 drivers/gpu/drm/drm_prime.c:228
Code: 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 1f 48 8b 83 90 00 00 00 48 85 c0 75 06 5b e9 e7 6c 1d fd e8 e2 6c 1d fd <0f> 0b 5b e9 da 6c 1d fd e8 05 5a 64 fd eb da 0f 1f 00 41 55 49 89
RSP: 0018:ffffc90002af79e0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888025e72370 RCX: 0000000000000000
RDX: ffff8880727aa1c0 RSI: ffffffff845a788e RDI: ffff888025e72400
RBP: ffff8881471d4068 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817e23e8 R11: 0000000000088078 R12: ffff888025e72000
R13: ffff888025e722b8 R14: ffff8881471d4098 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffea39ef0d8 CR3: 00000000791d8000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
drm_file_free.part.0+0x6e5/0xb80 drivers/gpu/drm/drm_file.c:291
drm_file_free drivers/gpu/drm/drm_file.c:248 [inline]
drm_close_helper.isra.0+0x17d/0x1f0 drivers/gpu/drm/drm_file.c:308
drm_release+0x1e6/0x530 drivers/gpu/drm/drm_file.c:495
__fput+0x286/0x9f0 fs/file_table.c:317
task_work_run+0xdd/0x1a0 kernel/task_work.c:164
exit_task_work include/linux/task_work.h:32 [inline]
do_exit+0xb29/0x2a30 kernel/exit.c:806
do_group_exit+0xd2/0x2f0 kernel/exit.c:935
get_signal+0x45a/0x2490 kernel/signal.c:2863
arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207
__syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
ret_from_fork+0x15/0x30 arch/x86/entry/entry_64.S:288
RIP: 0033:0x7f836c6a0471
Code: Unable to access opcode bytes at RIP 0x7f836c6a0447.
RSP: 002b:00007f836afd22f0 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: 0000000000000000 RBX: 00007f836afd2700 RCX: 00007f836c6a0471
RDX: 00007f836afd29d0 RSI: 00007f836afd22f0 RDI: 00000000003d0f00
RBP: 00007ffed5e285a0 R08: 00007f836afd2700 R09: 00007f836afd2700
R10: 00007f836afd29d0 R11: 0000000000000206 R12: 00007ffed5e2840e
R13: 00007ffed5e2840f R14: 00007f836afd2300 R15: 0000000000022000

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