linux-kernel - [syzbot] [kernel?] WARNING: locking bug in sched_core

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Date: Fri, 21 Jun 2024 14:02:22 -0700
From: syzbot <syzbot+14641d8d78cc029add8a@...kaller.appspotmail.com>
To: bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com, 
	linux-kernel@...r.kernel.org, mingo@...hat.com, 
	syzkaller-bugs@...glegroups.com, tglx@...utronix.de, x86@...nel.org
Subject: [syzbot] [kernel?] WARNING: locking bug in sched_core_balance

Hello,

syzbot found the following issue on:

HEAD commit:    2ccbdf43d5e7 Merge tag 'for-linus' of git://git.kernel.org..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17c092b6980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=fa0ce06dcc735711
dashboard link: https://syzkaller.appspot.com/bug?extid=14641d8d78cc029add8a
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/27e64d7472ce/disk-2ccbdf43.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e1c494bb5c9c/vmlinux-2ccbdf43.xz
kernel image: https://storage.googleapis.com/syzbot-assets/752498985a5e/bzImage-2ccbdf43.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+14641d8d78cc029add8a@...kaller.appspotmail.com

------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(1)
WARNING: CPU: 1 PID: 0 at kernel/locking/lockdep.c:232 hlock_class kernel/locking/lockdep.c:232 [inline]
WARNING: CPU: 1 PID: 0 at kernel/locking/lockdep.c:232 check_wait_context kernel/locking/lockdep.c:4773 [inline]
WARNING: CPU: 1 PID: 0 at kernel/locking/lockdep.c:232 __lock_acquire+0x573/0x1fd0 kernel/locking/lockdep.c:5087
Modules linked in:
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.10.0-rc3-syzkaller-00044-g2ccbdf43d5e7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:hlock_class kernel/locking/lockdep.c:232 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4773 [inline]
RIP: 0010:__lock_acquire+0x573/0x1fd0 kernel/locking/lockdep.c:5087
Code: 00 00 83 3d ee 11 3b 0e 00 75 23 90 48 c7 c7 20 ba ca 8b 48 c7 c6 c0 bc ca 8b e8 78 e4 e5 ff 48 ba 00 00 00 00 00 fc ff df 90 <0f> 0b 90 90 90 31 db 48 81 c3 c4 00 00 00 48 89 d8 48 c1 e8 03 0f
RSP: 0018:ffffc900001a76f0 EFLAGS: 00010046
RAX: 07ded2e0bb41d000 RBX: 00000000000016f0 RCX: ffff888017ae0000
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000005 R08: ffffffff81585822 R09: fffffbfff1c39994
R10: dffffc0000000000 R11: fffffbfff1c39994 R12: 0000000000000001
R13: ffff888017ae0000 R14: 0000000000000005 R15: ffff888017ae0b28
FS:  0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32e3f000 CR3: 0000000059698000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
 _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
 raw_spin_rq_lock_nested+0xb0/0x140 kernel/sched/core.c:567
 raw_spin_rq_lock kernel/sched/sched.h:1406 [inline]
 raw_spin_rq_lock_irq kernel/sched/sched.h:1412 [inline]
 sched_core_balance+0xfa6/0x1180 kernel/sched/core.c:6422
 do_balance_callbacks kernel/sched/core.c:5051 [inline]
 __balance_callbacks+0x18a/0x280 kernel/sched/core.c:5105
 finish_lock_switch kernel/sched/core.c:5161 [inline]
 finish_task_switch+0x1d3/0x870 kernel/sched/core.c:5280
 context_switch kernel/sched/core.c:5411 [inline]
 __schedule+0x17f0/0x4a20 kernel/sched/core.c:6745
 schedule_idle+0x53/0x90 kernel/sched/core.c:6863
 do_idle+0x56a/0x5d0 kernel/sched/idle.c:360
 cpu_startup_entry+0x42/0x60 kernel/sched/idle.c:430
 start_secondary+0x100/0x100 arch/x86/kernel/smpboot.c:313
 common_startup_64+0x13e/0x147
 </TASK>


---
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