Re: [syzbot] [net?] [afs?] kernel BUG in rxrpc_destroy_all_connections (2)

[syzbot <syzbot+89001660f14fb7684c83@syzkaller.appspotmail.com>]

syzbot has found a reproducer for the following issue on:

HEAD commit:    f0100363d8c3 Merge tag 'xfs-fixes-7.3-rc5' of gitolite.ker..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17660c5e580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=7d012d9c67977ee4
dashboard link: https://syzkaller.appspot.com/bug?extid=89001660f14fb7684c83
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11ecb805580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16e6f525580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-f0100363.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/57240753f5ee/vmlinux-f0100363.xz
kernel image: https://storage.googleapis.com/syzbot-assets/2930b9a97546/bzImage-f0100363.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+89001660f14fb7684c83@syzkaller.appspotmail.com

netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim0 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim0 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim0 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
bridge_slave_1: left allmulticast mode
bridge_slave_1: left promiscuous mode
bridge0: port 2(bridge_slave_1) entered disabled state
bridge_slave_0: left allmulticast mode
bridge_slave_0: left promiscuous mode
bridge0: port 1(bridge_slave_0) entered disabled state
bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
bond0 (unregistering): Released all slaves
rxrpc: Assertion failed
------------[ cut here ]------------
kernel BUG at net/rxrpc/conn_object.c:488!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 2 UID: 0 PID: 5766 Comm: kworker/u32:3 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: netns cleanup_net
RIP: 0010:rxrpc_destroy_all_connections.cold+0x12/0x14 net/rxrpc/conn_object.c:488
Code: ff 90 0f 0b e8 39 99 99 00 48 c7 c7 60 6a 5d 8d e8 3d c0 af ff 90 0f 0b e8 25 99 99 00 48 c7 c7 60 6a 5d 8d e8 29 c0 af ff 90 <0f> 0b e8 11 99 99 00 49 63 d6 48 83 ce ff 48 c7 c7 40 f3 00 91 e8
RSP: 0018:ffffc90003f27970 EFLAGS: 00010286
RAX: 0000000000000017 RBX: ffff8880394c0000 RCX: 0000000000000000
RDX: 0000000000000017 RSI: ffffffff81ea1579 RDI: fffff520007e4f1f
RBP: ffff8880394c0064 R08: 0000000000000007 R09: 0000000000000000
R10: 8000000000000000 R11: 0000000000000001 R12: 1ffff920007e4f30
R13: ffff8880394c0078 R14: ffff8880394c0088 R15: ffff8880394c0088
FS:  0000000000000000(0000) GS:ffff8880d5d53000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055a4b15ca000 CR3: 000000003c5bd000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 rxrpc_exit_net+0x7b/0xc0 net/rxrpc/net_ns.c:113
 ops_exit_list net/core/net_namespace.c:200 [inline]
 ops_undo_list+0x2ee/0xab0 net/core/net_namespace.c:253
 cleanup_net+0x499/0x920 net/core/net_namespace.c:706
 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
 process_scheduled_works kernel/workqueue.c:3479 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:rxrpc_destroy_all_connections.cold+0x12/0x14 net/rxrpc/conn_object.c:488
Code: ff 90 0f 0b e8 39 99 99 00 48 c7 c7 60 6a 5d 8d e8 3d c0 af ff 90 0f 0b e8 25 99 99 00 48 c7 c7 60 6a 5d 8d e8 29 c0 af ff 90 <0f> 0b e8 11 99 99 00 49 63 d6 48 83 ce ff 48 c7 c7 40 f3 00 91 e8
RSP: 0018:ffffc90003f27970 EFLAGS: 00010286
RAX: 0000000000000017 RBX: ffff8880394c0000 RCX: 0000000000000000
RDX: 0000000000000017 RSI: ffffffff81ea1579 RDI: fffff520007e4f1f
RBP: ffff8880394c0064 R08: 0000000000000007 R09: 0000000000000000
R10: 8000000000000000 R11: 0000000000000001 R12: 1ffff920007e4f30
R13: ffff8880394c0078 R14: ffff8880394c0088 R15: ffff8880394c0088
FS:  0000000000000000(0000) GS:ffff8880d5d53000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055a4b15ca000 CR3: 000000003c5bd000 CR4: 0000000000352ef0


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.