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[  147.371050] drm-kunit-mock-device drm_test_framebuffer_free.drm-kunit-mock-device: [drm] drm_WARN_ON(!list_empty(&fb->filp_head))
[  147.371603] WARNING: CPU: 0 PID: 2600 at drivers/gpu/drm/drm_framebuffer.c:832 drm_framebuffer_free+0x13f/0x1c0
[  147.373280] Modules linked in:
[  147.373496] CPU: 0 UID: 0 PID: 2600 Comm: kunit_try_catch Tainted: G    B D W        N  6.15.0-rc7-next-20250526 #1 PREEMPT(voluntary) 
[  147.374350] Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN, [N]=TEST
[  147.374607] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[  147.375172] RIP: 0010:drm_framebuffer_free+0x13f/0x1c0
[  147.375445] Code: 8b 7d 50 4d 85 ff 74 2b 4c 89 ef e8 6b 41 87 00 48 c7 c1 e0 ca 7d a7 4c 89 fa 48 c7 c7 40 cb 7d a7 48 89 c6 e8 32 ef 7a fe 90 <0f> 0b 90 90 e9 1c ff ff ff 48 b8 00 00 00 00 00 fc ff df 4c 89 ea
[  147.376324] RSP: 0000:ffff888104277b68 EFLAGS: 00010282
[  147.376581] RAX: 0000000000000000 RBX: ffff888104277c40 RCX: 1ffffffff50a4cec
[  147.377043] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001
[  147.377509] RBP: ffff888104277b90 R08: 0000000000000000 R09: fffffbfff50a4cec
[  147.377848] R10: 0000000000000003 R11: 0000000000039b40 R12: ffff888104277c18
[  147.378244] R13: ffff8881008fd800 R14: ffff888103da4000 R15: ffff8881031c4580
[  147.378557] FS:  0000000000000000(0000) GS:ffff8881ab05b000(0000) knlGS:0000000000000000
[  147.378938] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  147.379303] CR2: 00007ffff7ffe000 CR3: 000000016b8bc000 CR4: 00000000000006f0
[  147.379840] DR0: ffffffffa9869400 DR1: ffffffffa9869401 DR2: ffffffffa9869403
[  147.380313] DR3: ffffffffa9869405 DR6: 00000000ffff0ff0 DR7: 0000000000000600
[  147.380618] Call Trace:
[  147.380722]  <TASK>
[  147.380850]  drm_test_framebuffer_free+0x1ab/0x610
[  147.381258]  ? __pfx_drm_test_framebuffer_free+0x10/0x10
[  147.382104]  ? __pfx_drm_mode_config_init_release+0x10/0x10
[  147.382384]  ? __pfx_drm_mode_config_init_release+0x10/0x10
[  147.382659]  ? __drmm_add_action_or_reset+0x22/0x50
[  147.383325]  ? __schedule+0x10cc/0x2b60
[  147.383671]  ? __pfx_read_tsc+0x10/0x10
[  147.383963]  ? ktime_get_ts64+0x86/0x230
[  147.384482]  kunit_try_run_case+0x1a5/0x480
[  147.384694]  ? __pfx_kunit_try_run_case+0x10/0x10
[  147.385184]  ? _raw_spin_lock_irqsave+0xa1/0x100
[  147.385440]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[  147.385701]  ? __kthread_parkme+0x82/0x180
[  147.386144]  ? preempt_count_sub+0x50/0x80
[  147.386451]  ? __pfx_kunit_try_run_case+0x10/0x10
[  147.386667]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[  147.387305]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[  147.387616]  kthread+0x337/0x6f0
[  147.387961]  ? trace_preempt_on+0x20/0xc0
[  147.388469]  ? __pfx_kthread+0x10/0x10
[  147.388777]  ? _raw_spin_unlock_irq+0x47/0x80
[  147.389217]  ? calculate_sigpending+0x7b/0xa0
[  147.389472]  ? __pfx_kthread+0x10/0x10
[  147.389662]  ret_from_fork+0x116/0x1d0
[  147.389833]  ? __pfx_kthread+0x10/0x10
[  147.390024]  ret_from_fork_asm+0x1a/0x30
[  147.390694]  </TASK>
[  147.390806] ---[ end trace 0000000000000000 ]---