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

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Message-ID: <6746c1e5.050a0220.1286eb.002a.GAE@google.com>
Date: Tue, 26 Nov 2024 22:53:25 -0800
From: syzbot <syzbot+37a95c05fafd621ecf0c@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [kernel?] WARNING: locking bug in sched_core_lock (2)

Hello,

syzbot found the following issue on:

HEAD commit:    06afb0f36106 Merge tag 'trace-v6.13' of git://git.kernel.o..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12ff175f980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=95b76860fd16c857
dashboard link: https://syzkaller.appspot.com/bug?extid=37a95c05fafd621ecf0c
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/112cedff0255/disk-06afb0f3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f65020d28328/vmlinux-06afb0f3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/4fb4cb7df5b1/bzImage-06afb0f3.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+37a95c05fafd621ecf0c@...kaller.appspotmail.com

------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(1)
WARNING: CPU: 0 PID: 13420 at kernel/locking/lockdep.c:232 hlock_class kernel/locking/lockdep.c:232 [inline]
WARNING: CPU: 0 PID: 13420 at kernel/locking/lockdep.c:232 check_wait_context kernel/locking/lockdep.c:4850 [inline]
WARNING: CPU: 0 PID: 13420 at kernel/locking/lockdep.c:232 __lock_acquire+0x564/0x2100 kernel/locking/lockdep.c:5176
Modules linked in:
CPU: 0 UID: 0 PID: 13420 Comm: syz.7.1623 Not tainted 6.12.0-syzkaller-07834-g06afb0f36106 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:hlock_class kernel/locking/lockdep.c:232 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4850 [inline]
RIP: 0010:__lock_acquire+0x564/0x2100 kernel/locking/lockdep.c:5176
Code: 00 00 83 3d 11 c9 ac 0e 00 75 23 90 48 c7 c7 80 d1 0a 8c 48 c7 c6 80 d4 0a 8c e8 77 64 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:ffffc90003d7f2d0 EFLAGS: 00010046
RAX: 4215103f8b5df600 RBX: 00000000000010d8 RCX: 0000000000080000
RDX: dffffc0000000000 RSI: 000000000000957f RDI: 0000000000009580
RBP: 00000000000c10d8 R08: ffffffff8155fe42 R09: 1ffff110170c519a
R10: dffffc0000000000 R11: ffffed10170c519b R12: ffff8880359028c4
R13: 000000000000000f R14: 1ffff11006b2052f R15: ffff888035902978
FS:  00007f6b83fff6c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f45936a0d58 CR3: 000000005dcb4000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
 _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
 sched_core_lock+0x162/0x240 kernel/sched/core.c:374
 __sched_core_flip+0x176/0x440 kernel/sched/core.c:401
 __sched_core_enable kernel/sched/core.c:438 [inline]
 sched_core_get+0xbd/0x180 kernel/sched/core.c:456
 sched_core_alloc_cookie+0x71/0xa0 kernel/sched/core_sched.c:18
 sched_core_share_pid+0x298/0x7d0 kernel/sched/core_sched.c:185
 __do_sys_prctl kernel/sys.c:2741 [inline]
 __se_sys_prctl+0x956/0x3b50 kernel/sys.c:2467
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6b8317e819
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6b83fff038 EFLAGS: 00000246 ORIG_RAX: 000000000000009d
RAX: ffffffffffffffda RBX: 00007f6b83335fa0 RCX: 00007f6b8317e819
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000000003e
RBP: 00007f6b831f175e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f6b83335fa0 R15: 00007fffd307ecc8
 </TASK>


---
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