linux-kernel - [syzbot] [mm?] WARNING in copy

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Message-ID: <68abd1c8.050a0220.37038e.0083.GAE@google.com>
Date: Sun, 24 Aug 2025 20:00:24 -0700
From: syzbot <syzbot+69c74d38464686431506@...kaller.appspotmail.com>
To: Liam.Howlett@...cle.com, akpm@...ux-foundation.org, bsegall@...gle.com, 
	david@...hat.com, dietmar.eggemann@....com, juri.lelli@...hat.com, 
	kees@...nel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, 
	lorenzo.stoakes@...cle.com, mgorman@...e.de, mhocko@...e.com, 
	mingo@...hat.com, peterz@...radead.org, rostedt@...dmis.org, rppt@...nel.org, 
	surenb@...gle.com, syzkaller-bugs@...glegroups.com, vbabka@...e.cz, 
	vincent.guittot@...aro.org, vschneid@...hat.com
Subject: [syzbot] [mm?] WARNING in copy_process

Hello,

syzbot found the following issue on:

HEAD commit:    41cd3fd15263 Merge tag 'pci-v6.17-fixes-2' of git://git.ke..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13d8b3bc580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=fecbb496f75d3d61
dashboard link: https://syzkaller.appspot.com/bug?extid=69c74d38464686431506
compiler:       gcc (Debian 12.2.0-14) 12.2.0, 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/ea83f558e101/disk-41cd3fd1.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a35b75cdd97b/vmlinux-41cd3fd1.xz
kernel image: https://storage.googleapis.com/syzbot-assets/37d76e9636c2/bzImage-41cd3fd1.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+69c74d38464686431506@...kaller.appspotmail.com

oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=/,mems_allowed=0-1,oom_memcg=/syz1,task_memcg=/syz1,task=syz.1.3237,pid=23388,uid=0
Memory cgroup out of memory: Killed process 23388 (syz.1.3237) total-vm:101828kB, anon-rss:940kB, file-rss:21532kB, shmem-rss:0kB, UID:0 pgtables:116kB oom_score_adj:1000
------------[ cut here ]------------
pvqspinlock: lock 0xffff88803512c0c0 has corrupted value 0x0!
WARNING: CPU: 0 PID: 23388 at kernel/locking/qspinlock_paravirt.h:504 __pv_queued_spin_unlock_slowpath+0x237/0x330 kernel/locking/qspinlock_paravirt.h:504
Modules linked in:
CPU: 0 UID: 0 PID: 23388 Comm: syz.1.3237 Tainted: G     U              syzkaller #0 PREEMPT(full) 
Tainted: [U]=USER
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__pv_queued_spin_unlock_slowpath+0x237/0x330 kernel/locking/qspinlock_paravirt.h:504
Code: 03 0f b6 14 02 4c 89 e8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 67 41 8b 55 00 4c 89 ee 48 c7 c7 00 81 ad 8b e8 fa aa e6 f5 90 <0f> 0b 90 90 e9 64 ff ff ff 90 0f 0b 48 89 df 4c 89 04 24 e8 71 15
RSP: 0018:ffffc9000e9c79c8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff88803512c0c0 RCX: ffffffff817a02c8
RDX: ffff88802fa9bc00 RSI: ffffffff817a02d5 RDI: 0000000000000001
RBP: ffff88803512c0c8 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 00000000000d4550 R12: ffff88803512c0d0
R13: ffff88803512c0c0 R14: 00000000003d0f00 R15: ffff88802ab43c00
FS:  0000555568154500(0000) GS:ffff8881246c4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f86cc8e86ec CR3: 0000000060c0e000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __raw_callee_save___pv_queued_spin_unlock_slowpath+0x15/0x30
 .slowpath+0x9/0x18
 pv_queued_spin_unlock arch/x86/include/asm/paravirt.h:562 [inline]
 queued_spin_unlock arch/x86/include/asm/qspinlock.h:57 [inline]
 do_raw_spin_unlock+0x172/0x230 kernel/locking/spinlock_debug.c:142
 __raw_spin_unlock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_unlock+0x1e/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 copy_process+0x6b72/0x7690 kernel/fork.c:2432
 kernel_clone+0xfc/0x930 kernel/fork.c:2605
 __do_sys_clone3+0x212/0x290 kernel/fork.c:2909
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f86cbbc3449
Code: d7 08 00 48 8d 3d fc d7 08 00 e8 02 29 f6 ff 66 90 b8 ea ff ff ff 48 85 ff 74 2c 48 85 d2 74 27 49 89 c8 b8 b3 01 00 00 0f 05 <48> 85 c0 7c 18 74 01 c3 31 ed 48 83 e4 f0 4c 89 c7 ff d2 48 89 c7
RSP: 002b:00007ffe52a9ff08 EFLAGS: 00000206 ORIG_RAX: 00000000000001b3
RAX: ffffffffffffffda RBX: 00007f86cbb45850 RCX: 00007f86cbbc3449
RDX: 00007f86cbb45850 RSI: 0000000000000058 RDI: 00007ffe52a9ff50
RBP: 00007f86c9dee6c0 R08: 00007f86c9dee6c0 R09: 00007ffe52aa0037
R10: 0000000000000008 R11: 0000000000000206 R12: ffffffffffffffa8
R13: 000000000000000b R14: 00007ffe52a9ff50 R15: 00007ffe52aa0038
 </TASK>


---
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