BUG: corrupted list in default_device_exit_batch

[Xingyu Li]

Hi,

We found a bug in Linux 6.10 using syzkaller. It is possibly a
corrupted list  bug.
The bug report is as follows, but unfortunately there is no generated
syzkaller reproducer.

Bug report:

veth1_vlan: left promiscuous mode
veth0_vlan: left promiscuous mode
list_del corruption. prev->next should be ffff88803fda68c8, but was
0000000000000000. (prev=ffff88802dbac0c8)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:64!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 0 PID: 1076 Comm: kworker/u4:6 Not tainted 6.10.0 #13
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
Workqueue: netns cleanup_net
RIP: 0010:__list_del_entry_valid_or_report+0x10a/0x120 lib/list_debug.c:62
Code: e8 bb ff 96 06 0f 0b 48 c7 c7 80 5b a9 8b 4c 89 fe e8 aa ff 96
06 0f 0b 48 c7 c7 e0 5b a9 8b 4c 89 fe 48 89 d9 e8 96 ff 96 06 <0f> 0b
48 c7 c7 60 5c a9 8b 4c 89 fe 4c 89 f1 e8 82 ff 96 06 0f 0b
RSP: 0018:ffffc900047af650 EFLAGS: 00010246
RAX: 000000000000006d RBX: ffff88802dbac0c8 RCX: 904aecab9713c100
RDX: 0000000000000000 RSI: 0000000080000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff8172e30c R09: 1ffff920008f5e68
R10: dffffc0000000000 R11: fffff520008f5e69 R12: dffffc0000000000
R13: ffff88803fda68c0 R14: ffff888043bd00c8 R15: ffff88803fda68c8
FS:  0000000000000000(0000) GS:ffff888063a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd14ca4048 CR3: 000000003a7f0000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __list_del_entry_valid include/linux/list.h:124 [inline]
 __list_del_entry include/linux/list.h:215 [inline]
 list_del include/linux/list.h:229 [inline]
 klist_release lib/klist.c:189 [inline]
 kref_put include/linux/kref.h:65 [inline]
 klist_dec_and_del+0x9a/0x410 lib/klist.c:206
 klist_put lib/klist.c:217 [inline]
 klist_del+0xa3/0x100 lib/klist.c:230
 device_del+0x4d4/0x940 drivers/base/core.c:3862
 unregister_netdevice_many_notify+0x11a3/0x16d0 net/core/dev.c:11249
 unregister_netdevice_many net/core/dev.c:11277 [inline]
 default_device_exit_batch+0xa79/0xaf0 net/core/dev.c:11760
 ops_exit_list net/core/net_namespace.c:178 [inline]
 cleanup_net+0x8ae/0xcd0 net/core/net_namespace.c:640
 process_one_work kernel/workqueue.c:3248 [inline]
 process_scheduled_works+0x977/0x1410 kernel/workqueue.c:3329
 worker_thread+0xaa0/0x1020 kernel/workqueue.c:3409
 kthread+0x2eb/0x380 kernel/kthread.c:389
 ret_from_fork+0x49/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_del_entry_valid_or_report+0x10a/0x120 lib/list_debug.c:62
Code: e8 bb ff 96 06 0f 0b 48 c7 c7 80 5b a9 8b 4c 89 fe e8 aa ff 96
06 0f 0b 48 c7 c7 e0 5b a9 8b 4c 89 fe 48 89 d9 e8 96 ff 96 06 <0f> 0b
48 c7 c7 60 5c a9 8b 4c 89 fe 4c 89 f1 e8 82 ff 96 06 0f 0b
RSP: 0018:ffffc900047af650 EFLAGS: 00010246
RAX: 000000000000006d RBX: ffff88802dbac0c8 RCX: 904aecab9713c100
RDX: 0000000000000000 RSI: 0000000080000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff8172e30c R09: 1ffff920008f5e68
R10: dffffc0000000000 R11: fffff520008f5e69 R12: dffffc0000000000
R13: ffff88803fda68c0 R14: ffff888043bd00c8 R15: ffff88803fda68c8
FS:  0000000000000000(0000) GS:ffff888063a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd14ca4048 CR3: 000000003a7f0000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


-- 
Yours sincerely,
Xingyu