[syzbot] [kvm?] WARNING in kvm_put_kvm (3)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 6b8c8af514d7 Add linux-next specific files for 20260807
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=14548079580000
kernel config: https://syzkaller.appspot.com/x/.config?x=6d343b54cc50df0f
dashboard link: https://syzkaller.appspot.com/bug?extid=d4faf7db59e11f6fd1ab
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1528e132580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/71ff4edcb608/disk-6b8c8af5.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/1f5fa331d8f2/vmlinux-6b8c8af5.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f993558ec63b/bzImage-6b8c8af5.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d4faf7...@syzkaller.appspotmail.com

------------[ cut here ]------------
timer_delete_sync(&sdp->delay_work)
WARNING: kernel/rcu/srcutree.c:706 at cleanup_srcu_struct+0x3aa/0x890 kernel/rcu/srcutree.c:706, CPU#1: syz.1.1070/8126
Modules linked in:
CPU: 1 UID: 0 PID: 8126 Comm: syz.1.1070 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:cleanup_srcu_struct+0x3aa/0x890 kernel/rcu/srcutree.c:706
Code: b9 8a 00 48 83 7d 00 00 4c 8b 74 24 10 0f 85 dd 03 00 00 41 ff c5 41 83 e5 0f 41 83 fd 07 0f 86 0e ff ff ff e9 ab 00 00 00 90 <0f> 0b 90 4c 8d b5 00 02 00 00 4c 89 f3 48 c1 eb 03 48 b8 00 00 00
RSP: 0018:ffffc9000bbbfc50 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000607edad41c80 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8e253559 RDI: 00000000ffffffff
RBP: ffffe8ffffc4dc80 R08: ffffffff9058fb7f R09: 1ffffffff20b1f6f
R10: dffffc0000000000 R11: fffffbfff20b1f70 R12: ffff88807bfa8000
R13: 0000000000000000 R14: ffffffff8e5237d0 R15: 1ffffffff1ca47de
FS: 000055557293c500(0000) GS:ffff88812500c000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000071042000 CR4: 00000000003526f0
Call Trace:
<TASK>
kvm_destroy_vm virt/kvm/kvm_main.c:1303 [inline]
kvm_put_kvm+0x9cb/0xb50 virt/kvm/kvm_main.c:1332
kvm_vm_release+0x43/0x50 virt/kvm/kvm_main.c:1355
__fput+0x418/0xa50 fs/file_table.c:512
task_work_run+0x1d9/0x270 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:70 [inline]
exit_to_user_mode_loop+0x22e/0x770 kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:336 [inline]
do_syscall_64+0x328/0x510 arch/x86/entry/syscall_64.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f25cc99e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffed2b09948 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffed2b09a30 RCX: 00007f25cc99e0d9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 0000000000051665 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b2d520000 R11: 0000000000000246 R12: 00007ffed2b09a70
R13: 00007f25ccc25fac R14: 00000000000516bf R15: 00007f25ccc25fa0
</TASK>


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