On 2026-02-24 17:27:03 [+0100], To Maarten Lankhorst wrote:
>
> There is nothing else, that popped up. So far no objections from my side
> ;) Thank you.
different HW.
| i915 0000:00:02.0: [drm] *ERROR* [CRTC:170:pipe A] flip_done timed out
| rcu: INFO: rcu_preempt self-detected stall on CPU
| rcu: 7-....: (1 GPs behind) idle=bc04/1/0x4000000000000000
softirq=0/0 fqs=3084 rcuc=6502 jiffies(starved)
| rcu: (t=6500 jiffies g=46813 q=13322 ncpus=8)
| CPU: 7 UID: 0 PID: 12616 Comm: irq/182-i915 Tainted: G U E
7.0.0-rc1-lockdep+ #2 PREEMPT_{RT,(lazy)}
| Tainted: [U]=USER, [E]=UNSIGNED_MODULE
| Hardware name: LENOVO 20TD00GLGE/20TD00GLGE, BIOS R1EET64W(1.64 ) 03/18/2025
| RIP: 0010:intel_context_remove_breadcrumbs+0x14a/0x1a0 [i915]
| Code: 00 00 48 8b 50 70 b8 ff ff ff ff f0 41 0f c1 06 83 f8 01 74 58 85 c0
7f 11 be 03 00 00 00 4c 89 f7 e8 fa 65 db e7 eb 02 f3 90 <41> 8b 84 24 a0 00 00
00 85 c0 75 f2 48 83 c4 08 5b 5d 41 5c 41 5d
| RSP: 0018:ffffd2aa007d7c48 EFLAGS: 00000202
| RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000000000001
| RDX: ffffffffc282ab20 RSI: ffffffffab33e33f RDI: 00000000ffffffff
| RBP: ffff8f1247401680 R08: 0000000000000001 R09: 0000000000000000
| R10: 0000000000000000 R11: 0000000000000000 R12: ffff8f104f3b6200
| R13: ffff8f12474017e0 R14: ffff8f1247401798 R15: ffff8f119e89e3a8
| FS: 0000000000000000(0000) GS:ffff8f140318b000(0000) knlGS:0000000000000000
| CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
| CR2: 00007f5409dc6000 CR3: 000000029ea56006 CR4: 0000000000f72ef0
| PKRU: 55555554
| Call Trace:
| <TASK>
| __execlists_schedule_out+0x1a6/0x340 [i915]
| execlists_submission_tasklet+0x178/0x1bb0 [i915]
| tasklet_action_common+0x1e9/0x410
| handle_softirqs.isra.0+0xbd/0x3f0
| __local_bh_enable_ip+0xe0/0x170
| irq_forced_thread_fn+0x41/0x50
| irq_thread+0x20d/0x360
| kthread+0x103/0x140
| ret_from_fork+0x34d/0x480
| ret_from_fork_asm+0x1a/0x30
| </TASK>
It seems to be always stuck in intel_context_remove_breadcrumbs.
and top shows
| 42 root 20 0 0 0 0 R 100,0 0,0 3:21.62
ksoftirqd/2
| 12616 root -51 0 0 0 0 R 100,0 0,0 3:34.61
irq/182-i915
seems busy. The NMI backtrace reports always
intel_context_remove_breadcrumbs() on CPU, don't see the irq handler.
This one I can reproduce while opening a browser and surfing a bit. Let
me try step by step without lockdep, without RT and maybe just play
v7.0-rc1 to figure out where this is from…
Sebastian
