linux-kernel - [syzbot] [afs?] WARNING in delete

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Message-ID: <68e3cdd7.a00a0220.2a5ca.000b.GAE@google.com>
Date: Mon, 06 Oct 2025 07:10:31 -0700
From: syzbot <syzbot+34813cbce633c9091556@...kaller.appspotmail.com>
To: dhowells@...hat.com, linux-afs@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, marc.dionne@...istor.com, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [afs?] WARNING in delete_node (4)

Hello,

syzbot found the following issue on:

HEAD commit:    7f7072574127 Merge tag 'kbuild-6.18-1' of git://git.kernel..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12c55942580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8582d1234819ed79
dashboard link: https://syzkaller.appspot.com/bug?extid=34813cbce633c9091556
compiler:       gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386

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

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-7f707257.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0e0a26398b43/vmlinux-7f707257.xz
kernel image: https://storage.googleapis.com/syzbot-assets/44d1286a1f5d/bzImage-7f707257.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+34813cbce633c9091556@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 3 PID: 33 at lib/radix-tree.c:572 delete_node+0x223/0x8d0 lib/radix-tree.c:572
Modules linked in:
CPU: 3 UID: 0 PID: 33 Comm: ksoftirqd/3 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:delete_node+0x223/0x8d0 lib/radix-tree.c:572
Code: 66 58 f6 41 bc 01 00 00 00 e8 49 ea 71 f6 44 89 e0 48 83 c4 28 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc e8 2e ea 71 f6 90 <0f> 0b 90 e8 25 ea 71 f6 48 c7 c6 90 88 48 8b 4c 89 e7 e8 a6 66 58
RSP: 0018:ffffc900005bfac0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88802aec6160 RCX: ffffffff8b489df3
RDX: ffff88801bbea480 RSI: ffffffff8b489e82 RDI: ffff88802aec61a8
RBP: ffff888025afc000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000002b71 R12: ffff888025afc018
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000004000004
FS:  0000000000000000(0000) GS:ffff888097f66000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000008001b000 CR3: 000000005e8cd000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __radix_tree_delete+0x193/0x3d0 lib/radix-tree.c:1379
 radix_tree_delete_item+0xea/0x230 lib/radix-tree.c:1430
 afs_cell_destroy+0x1db/0x310 fs/afs/cell.c:523
 rcu_do_batch kernel/rcu/tree.c:2605 [inline]
 rcu_core+0x799/0x1530 kernel/rcu/tree.c:2861
 handle_softirqs+0x219/0x8e0 kernel/softirq.c:622
 run_ksoftirqd kernel/softirq.c:1063 [inline]
 run_ksoftirqd+0x3a/0x60 kernel/softirq.c:1055
 smpboot_thread_fn+0x3f4/0xae0 kernel/smpboot.c:160
 kthread+0x3c2/0x780 kernel/kthread.c:463
 ret_from_fork+0x56d/0x730 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>


---
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