netdev - Re: [PATCH net-next] tcx: Fix splat in ingress_destroy upon tcx_entry

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Date: Fri, 4 Aug 2023 16:31:39 +0300
From: Ido Schimmel <idosch@...sch.org>
To: Gal Pressman <gal@...dia.com>
Cc: Daniel Borkmann <daniel@...earbox.net>, kuba@...nel.org, ast@...nel.org,
	bpf@...r.kernel.org, netdev@...r.kernel.org,
	syzbot+bdcf141f362ef83335cf@...kaller.appspotmail.com,
	syzbot+b202b7208664142954fa@...kaller.appspotmail.com,
	syzbot+14736e249bce46091c18@...kaller.appspotmail.com
Subject: Re: [PATCH net-next] tcx: Fix splat in ingress_destroy upon
 tcx_entry_free

On Thu, Aug 03, 2023 at 02:10:51PM +0300, Gal Pressman wrote:
> Our nightly regression testing picked up new memory leaks which were
> bisected to this commit.
> Unfortunately, I do not know the exact repro steps to trigger it, maybe
> the attached kmemeleak logs can help?

[...]

> unreferenced object 0xffff88812acdebc0 (size 16):
>   comm "umount.nfs", pid 11626, jiffies 4295354796 (age 45.472s)
>   hex dump (first 16 bytes):
>     73 65 72 76 65 72 2d 32 00 eb cd 2a 81 88 ff ff  server-2...*....
>   backtrace:
>     [<0000000010fb5130>] __kmalloc_node_track_caller+0x4c/0x170
>     [<00000000b866a733>] kvasprintf+0xb0/0x130
>     [<00000000b3564fca>] kasprintf+0xa6/0xd0
>     [<00000000f01d6cb3>] nfs_sysfs_move_sb_to_server+0x49/0xd0
>     [<000000009608708f>] nfs_kill_super+0x5f/0x90
>     [<0000000090d4108b>] deactivate_locked_super+0x80/0x130
>     [<000000000856aeb1>] cleanup_mnt+0x258/0x370
>     [<0000000040582e39>] task_work_run+0x12c/0x210
>     [<00000000378ea041>] exit_to_user_mode_prepare+0x1a0/0x1b0
>     [<00000000025e63dd>] syscall_exit_to_user_mode+0x19/0x50
>     [<00000000f34ad3ee>] do_syscall_64+0x4a/0x90
>     [<000000009d3e2403>] entry_SYSCALL_64_after_hwframe+0x46/0xb0

This one is caused by commit 1c7251187dc0 ("NFS: add superblock sysfs
entries") and fixed by [1], so I'm not sure the bisection result is
reliable.

[1] https://lore.kernel.org/linux-nfs/6702796fee0365bf399800326bbe6c88e5f73f68.1689014440.git.bcodding@redhat.com/