Re: [syzbot] [dri?] WARNING in drm_prime_destroy_file_private (3)

[syzbot <syzbot+d7c9eed171647e421013@syzkaller.appspotmail.com>]

Hello,

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

------------[ cut here ]------------
!RB_EMPTY_ROOT(&prime_fpriv->dmabufs)
WARNING: drivers/gpu/drm/drm_prime.c:224 at drm_prime_destroy_file_private+0x48/0x60 drivers/gpu/drm/drm_prime.c:224, CPU#0: syz.0.17/6327
Modules linked in:
CPU: 0 UID: 0 PID: 6327 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:drm_prime_destroy_file_private+0x48/0x60 drivers/gpu/drm/drm_prime.c:224
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 75 2b 48 8b 83 88 00 00 00 48 85 c0 75 0b e8 d4 d0 65 fc 5b e9 0e e5 ea 05 e8 c9 d0 65 fc 90 <0f> 0b 90 e8 c0 d0 65 fc 5b c3 cc cc cc cc e8 55 8f d3 fc eb ce 0f
RSP: 0018:ffffc900033cfc90 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88802d0da328 RCX: ffffffff8b8be29d
RDX: ffff8880776fca00 RSI: ffffffff85a2d617 RDI: ffff88802d0da3b0
RBP: ffff88802d0da000 R08: 0000000000000001 R09: fffff52000679f72
R10: ffffc900033cfb97 R11: ffffffff82763704 R12: ffff8880274ac000
R13: ffff88802d0da260 R14: 0000000000000002 R15: ffff88802d0da288
FS:  0000555556830500(0000) GS:ffff888124372000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007feba2986400 CR3: 0000000033a76000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 drm_file_free.part.0+0x7cf/0xc00 drivers/gpu/drm/drm_file.c:268
 drm_file_free drivers/gpu/drm/drm_file.c:237 [inline]
 drm_close_helper.isra.0+0x186/0x200 drivers/gpu/drm/drm_file.c:289
 drm_release+0x1ab/0x360 drivers/gpu/drm/drm_file.c:437
 __fput+0x3ff/0xb50 fs/file_table.c:510
 task_work_run+0x150/0x240 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
 exit_to_user_mode_loop+0x107/0x4f0 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x706/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7feba299cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd43dfae88 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffd43dfaf70 RCX: 00007feba299cdd9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 000000000001dafd R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b31020000 R11: 0000000000000246 R12: 00007ffd43dfafb0
R13: 00007feba2c15fac R14: 000000000001db37 R15: 00007feba2c15fa0
 </TASK>


Tested on:

commit:         1d5dcaa3 Merge tag 'probes-fixes-v7.1-rc3' of git://gi..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13baa3ce580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=59da38148f3a3d24
dashboard link: https://syzkaller.appspot.com/bug?extid=d7c9eed171647e421013
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
patch:          https://syzkaller.appspot.com/x/patch.diff?x=11187dba580000