linux-kernel - Re: [syzbot] [kernel?] WARNING in enqueue_dl

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Message-ID: <67410a37.050a0220.363a1b.0150.GAE@google.com>
Date: Fri, 22 Nov 2024 14:48:23 -0800
From: syzbot <syzbot+00a022dc9979d67df050@...kaller.appspotmail.com>
To: akpm@...ux-foundation.org, bsegall@...gle.com, dietmar.eggemann@....com, 
	juri.lelli@...hat.com, linux-kernel@...r.kernel.org, linux-mm@...ck.org, 
	mgorman@...e.de, mingo@...hat.com, peterz@...radead.org, rostedt@...dmis.org, 
	syzkaller-bugs@...glegroups.com, vincent.guittot@...aro.org, 
	vschneid@...hat.com
Subject: Re: [syzbot] [kernel?] WARNING in enqueue_dl_entity

syzbot has found a reproducer for the following issue on:

HEAD commit:    28eb75e178d3 Merge tag 'drm-next-2024-11-21' of https://gi..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1402175f980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5606b6814de0f638
dashboard link: https://syzkaller.appspot.com/bug?extid=00a022dc9979d67df050
compiler:       aarch64-linux-gnu-gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1016fec0580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/384ffdcca292/non_bootable_disk-28eb75e1.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/4053ed867efd/vmlinux-28eb75e1.xz
kernel image: https://storage.googleapis.com/syzbot-assets/903039310aac/Image-28eb75e1.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+00a022dc9979d67df050@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 10 at kernel/sched/deadline.c:1995 enqueue_dl_entity+0x478/0x58c kernel/sched/deadline.c:2029
Modules linked in:
CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Not tainted 6.12.0-syzkaller-07749-g28eb75e178d3 #0
Hardware name: linux,dummy-virt (DT)
Workqueue:  0x0 (events)
pstate: a14000c9 (NzCv daIF +PAN -UAO -TCO +DIT -SSBS BTYPE=--)
pc : enqueue_dl_entity+0x478/0x58c kernel/sched/deadline.c:1995
lr : dl_server_start+0x44/0x12c kernel/sched/deadline.c:1650
sp : ffff800082b33a10
x29: ffff800082b33a10 x28: fdf0000004e5dc00 x27: 0000000000000000
x26: 0000000000000001 x25: 0000000000000000 x24: 0000000000000048
x23: fff000007f8d7600 x22: 0000000000000001 x21: 000000000016e360
x20: 0000000000000001 x19: fff000007f8d7f68 x18: 0000000000000000
x17: 0000000000000004 x16: 0000000000000002 x15: 0000000000000000
x14: 0000000000000142 x13: 00000000000003db x12: 0000000000000001
x11: fff000007f8d7680 x10: 0000000000000284 x9 : 0000000000000048
x8 : 0000000000100000 x7 : 0000000000000000 x6 : fdf0000004e5dbc0
x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000000
x2 : 0000000000000001 x1 : 0000000000000001 x0 : 0000000000000001
Call trace:
 enqueue_dl_entity+0x478/0x58c kernel/sched/deadline.c:2029 (P)
 dl_server_start+0x44/0x12c kernel/sched/deadline.c:1650 (L)
 dl_server_start+0x44/0x12c kernel/sched/deadline.c:1650
 enqueue_task_fair+0x11c/0x3a4 kernel/sched/fair.c:7038
 enqueue_task+0x3c/0xe4 kernel/sched/core.c:2061
 activate_task+0x68/0x80 kernel/sched/core.c:2108
 attach_task+0x4c/0x74 kernel/sched/fair.c:9635
 attach_tasks kernel/sched/fair.c:9670 [inline]
 sched_balance_rq+0x580/0xc74 kernel/sched/fair.c:11747
 sched_balance_newidle.constprop.0+0x1b0/0x3e4 kernel/sched/fair.c:12789
 pick_next_task_fair+0x50/0x320 kernel/sched/fair.c:8937
 __pick_next_task kernel/sched/core.c:6023 [inline]
 pick_next_task kernel/sched/core.c:6542 [inline]
 __schedule+0x15c/0x900 kernel/sched/core.c:6709
 __schedule_loop kernel/sched/core.c:6833 [inline]
 schedule+0x34/0x104 kernel/sched/core.c:6848
 worker_thread+0x19c/0x354 kernel/workqueue.c:3406
 kthread+0x114/0x118 kernel/kthread.c:389
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862
---[ end trace 0000000000000000 ]---


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.