linux-kernel - Re: [syzbot] [batman?] [bluetooth?] memory leak in skb

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Message-ID: <69606eb9.050a0220.1c677c.03ae.GAE@google.com>
Date: Thu, 08 Jan 2026 18:58:01 -0800
From: syzbot <syzbot+6e76aa21aaf2d8be6034@...kaller.appspotmail.com>
To: kartikey406@...il.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [batman?] [bluetooth?] memory leak in skb_clone (3)

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
memory leak in skb_clone

2026/01/09 02:57:04 executed programs: 5
BUG: memory leak
unreferenced object 0xffff88810decb900 (size 240):
  comm "kworker/u9:1", pid 5134, jiffies 4294946665
  hex dump (first 32 bytes):
    90 6c 45 14 81 88 ff ff 90 6c 45 14 81 88 ff ff  .lE......lE.....
    00 00 00 00 00 00 00 00 00 6c 45 14 81 88 ff ff  .........lE.....
  backtrace (crc 8f01ee2f):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4958 [inline]
    slab_alloc_node mm/slub.c:5263 [inline]
    kmem_cache_alloc_noprof+0x3b4/0x590 mm/slub.c:5270
    skb_clone+0xae/0x2b0 net/core/skbuff.c:2087
    __skb_tstamp_tx+0x3a0/0x4c0 net/core/skbuff.c:5679
    hci_conn_tx_queue+0x11c/0x1d0 net/bluetooth/hci_conn.c:3050
    hci_send_conn_frame net/bluetooth/hci_core.c:3086 [inline]
    hci_sched_acl_pkt net/bluetooth/hci_core.c:3701 [inline]
    hci_sched_acl net/bluetooth/hci_core.c:3726 [inline]
    hci_tx_work+0x437/0x570 net/bluetooth/hci_core.c:3820
    process_one_work+0x26b/0x620 kernel/workqueue.c:3257
    process_scheduled_works kernel/workqueue.c:3340 [inline]
    worker_thread+0x2c4/0x4f0 kernel/workqueue.c:3421
    kthread+0x15b/0x310 kernel/kthread.c:463
    ret_from_fork+0x2cf/0x300 arch/x86/kernel/process.c:158
    ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246

connection error: failed to recv *flatrpc.ExecutorMessageRawT: EOF


Tested on:

commit:         5572ad8f Merge tag 'trace-v6.19-rc4' of git://git.kern..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10b65f92580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d60836e327fd6756
dashboard link: https://syzkaller.appspot.com/bug?extid=6e76aa21aaf2d8be6034
compiler:       gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=1007119a580000