linux-kernel - [syzbot] [kvm?] WARNING in srcu_check_nmi

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Message-ID: <66f4164d.050a0220.211276.0032.GAE@google.com>
Date: Wed, 25 Sep 2024 06:55:25 -0700
From: syzbot <syzbot+314c2cfd4071ad738810@...kaller.appspotmail.com>
To: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, pbonzini@...hat.com, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [kvm?] WARNING in srcu_check_nmi_safety (2)

Hello,

syzbot found the following issue on:

HEAD commit:    abf2050f51fd Merge tag 'media/v6.12-1' of git://git.kernel..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=114cc99f980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=bc30a30374b0753
dashboard link: https://syzkaller.appspot.com/bug?extid=314c2cfd4071ad738810
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 (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-abf2050f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2179ebeade58/vmlinux-abf2050f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f05289b5cf7c/bzImage-abf2050f.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+314c2cfd4071ad738810@...kaller.appspotmail.com

------------[ cut here ]------------
CPU 0 old state 2 new state 1
WARNING: CPU: 0 PID: 73 at kernel/rcu/srcutree.c:708 srcu_check_nmi_safety+0xca/0x150 kernel/rcu/srcutree.c:708
Modules linked in:
CPU: 0 UID: 0 PID: 73 Comm: kswapd0 Not tainted 6.11.0-syzkaller-09959-gabf2050f51fd #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:srcu_check_nmi_safety+0xca/0x150 kernel/rcu/srcutree.c:708
Code: 81 c3 c8 01 00 00 48 89 d8 48 c1 e8 03 42 0f b6 04 20 84 c0 75 77 8b 33 48 c7 c7 20 0c 0c 8c 89 ea 44 89 f9 e8 b7 8c db ff 90 <0f> 0b 90 90 eb 0c 42 0f b6 04 23 84 c0 75 3d 45 89 3e 48 83 c4 08
RSP: 0018:ffffc90000e464e0 EFLAGS: 00010246
RAX: 41404736cdfea900 RBX: ffffe8ffffc414c8 RCX: ffff88801efb0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000002 R08: ffffffff8155aaa2 R09: 1ffff11003f8519a
R10: dffffc0000000000 R11: ffffed1003f8519b R12: dffffc0000000000
R13: 0000607fe0041300 R14: ffffe8ffffc41320 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564aa6d10940 CR3: 0000000011c68000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 srcu_read_lock include/linux/srcu.h:248 [inline]
 __kvm_handle_hva_range virt/kvm/kvm_main.c:612 [inline]
 kvm_handle_hva_range virt/kvm/kvm_main.c:684 [inline]
 kvm_mmu_notifier_clear_flush_young+0xe6/0x820 virt/kvm/kvm_main.c:867
 __mmu_notifier_clear_flush_young+0x11d/0x1d0 mm/mmu_notifier.c:379
 mmu_notifier_clear_flush_young include/linux/mmu_notifier.h:410 [inline]
 folio_referenced_one+0xb9d/0x2160 mm/rmap.c:895
 rmap_walk_anon+0x4cd/0x8a0 mm/rmap.c:2638
 rmap_walk mm/rmap.c:2716 [inline]
 folio_referenced+0x394/0x7a0 mm/rmap.c:1008
 folio_check_references mm/vmscan.c:863 [inline]
 shrink_folio_list+0xe96/0x8cc0 mm/vmscan.c:1198
 evict_folios+0x549b/0x7b50 mm/vmscan.c:4583
 try_to_shrink_lruvec+0x9ab/0xbb0 mm/vmscan.c:4778
 shrink_one+0x3b9/0x850 mm/vmscan.c:4816
 shrink_many mm/vmscan.c:4879 [inline]
 lru_gen_shrink_node mm/vmscan.c:4957 [inline]
 shrink_node+0x3799/0x3de0 mm/vmscan.c:5937
 kswapd_shrink_node mm/vmscan.c:6765 [inline]
 balance_pgdat mm/vmscan.c:6957 [inline]
 kswapd+0x1ca3/0x3700 mm/vmscan.c:7226
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>


---
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