Re: BUG: corrupted list in neigh_destroy

[Joel Granados]

On Wed, Aug 28, 2024 at 04:34:39PM -0700, Xingyu Li wrote:
> 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.

Please resend once you find a reproducer.

> 
> Bug report:
> 
> list_del corruption, ffff88802cfc0d80->next is NULL
> ------------[ cut here ]------------
> kernel BUG at lib/list_debug.c:53!
> Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
> CPU: 0 PID: 4497 Comm: kworker/0:3 Not tainted 6.10.0 #13
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
> Workqueue: events_power_efficient neigh_periodic_work
> RIP: 0010:__list_del_entry_valid_or_report+0xc3/0x120 lib/list_debug.c:52
> Code: 08 48 89 df e8 4e 01 96 fd 48 8b 13 4c 39 fa 75 62 b0 01 5b 41
> 5c 41 5e 41 5f c3 48 c7 c7 60 5a a9 8b 4c 89 fe e8 dd ff 96 06 <0f> 0b
> 48 c7 c7 c0 5a a9 8b 4c 89 fe e8 cc ff 96 06 0f 0b 48 c7 c7
> RSP: 0018:ffffc90002ce7978 EFLAGS: 00010046
> RAX: 0000000000000033 RBX: 0000000000000000 RCX: 31a71fdaa0dd1600
> RDX: 0000000000000000 RSI: 0000000080000202 RDI: 0000000000000000
> RBP: ffffc90002ce7ac8 R08: ffffffff8172e30c R09: 1ffff9200059ced0
> R10: dffffc0000000000 R11: fffff5200059ced1 R12: dffffc0000000000
> R13: ffff88802cfc0d80 R14: 0000000000000000 R15: ffff88802cfc0d80
> FS:  0000000000000000(0000) GS:ffff888063a00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 000055dc1a4cee78 CR3: 000000000d932000 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_move_tail include/linux/list.h:310 [inline]
>  ref_tracker_free+0x191/0x7b0 lib/ref_tracker.c:262
>  netdev_tracker_free include/linux/netdevice.h:4058 [inline]
>  netdev_put include/linux/netdevice.h:4075 [inline]
>  neigh_destroy+0x317/0x570 net/core/neighbour.c:914
>  neigh_periodic_work+0x3c6/0xd40 net/core/neighbour.c:1007
>  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+0xc3/0x120 lib/list_debug.c:52
> Code: 08 48 89 df e8 4e 01 96 fd 48 8b 13 4c 39 fa 75 62 b0 01 5b 41
> 5c 41 5e 41 5f c3 48 c7 c7 60 5a a9 8b 4c 89 fe e8 dd ff 96 06 <0f> 0b
> 48 c7 c7 c0 5a a9 8b 4c 89 fe e8 cc ff 96 06 0f 0b 48 c7 c7
> RSP: 0018:ffffc90002ce7978 EFLAGS: 00010046
> RAX: 0000000000000033 RBX: 0000000000000000 RCX: 31a71fdaa0dd1600
> RDX: 0000000000000000 RSI: 0000000080000202 RDI: 0000000000000000
> RBP: ffffc90002ce7ac8 R08: ffffffff8172e30c R09: 1ffff9200059ced0
> R10: dffffc0000000000 R11: fffff5200059ced1 R12: dffffc0000000000
> R13: ffff88802cfc0d80 R14: 0000000000000000 R15: ffff88802cfc0d80
> FS:  0000000000000000(0000) GS:ffff888063a00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 000055dc1a4cee78 CR3: 000000000d932000 CR4: 0000000000350ef0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> 
> 
> -- 
> Yours sincerely,
> Xingyu

-- 

Joel Granados