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Fri, 12 Sep 2025 01:32:04 -0700 (PDT) Date: Fri, 12 Sep 2025 01:32:04 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68c3da84.050a0220.2ff435.0356.GAE@google.com> Subject: Re: [syzbot] [net?] [usb?] WARNING in rtl8150_start_xmit/usb_submit_urb From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viswanathiyyappan@gmail.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: WARNING in rtl8150_start_xmit/usb_submit_urb ------------[ cut here ]------------ URB ffff888024e5b900 submitted while active WARNING: drivers/usb/core/urb.c:380 at usb_submit_urb+0xf8c/0x18b0 drivers/usb/core/urb.c:380, CPU#1: kworker/u8:8/3539 Modules linked in: CPU: 1 UID: 0 PID: 3539 Comm: kworker/u8:8 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Workqueue: ipv6_addrconf addrconf_dad_work RIP: 0010:usb_submit_urb+0xf8c/0x18b0 drivers/usb/core/urb.c:380 Code: 00 00 00 e8 36 e0 85 fa e9 25 f1 ff ff e8 2c e0 85 fa c6 05 35 0c 95 08 01 90 48 c7 c7 a0 aa 56 8c 48 89 de e8 65 6f 49 fa 90 <0f> 0b 90 90 e9 ec f0 ff ff e8 06 e0 85 fa c6 05 77 61 ab 08 01 41 RSP: 0018:ffffc90000a08a20 EFLAGS: 00010246 RAX: e78eb3a935e39000 RBX: ffff888024e5b900 RCX: ffff888030b43c80 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002 RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff1c7a6c8 R12: 0000000000000820 R13: ffff888074fffa82 R14: ffff888024e5b908 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881258a7000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055c81342b078 CR3: 000000007e68c000 CR4: 00000000003526f0 Call Trace: rtl8150_start_xmit+0x2cb/0x5f0 drivers/net/usb/rtl8150.c:696 __netdev_start_xmit include/linux/netdevice.h:5222 [inline] netdev_start_xmit include/linux/netdevice.h:5231 [inline] xmit_one net/core/dev.c:3839 [inline] dev_hard_start_xmit+0x2d7/0x830 net/core/dev.c:3855 sch_direct_xmit+0x241/0x4b0 net/sched/sch_generic.c:344 qdisc_restart net/sched/sch_generic.c:409 [inline] __qdisc_run+0xb16/0x15f0 net/sched/sch_generic.c:417 qdisc_run+0xc2/0x230 include/net/pkt_sched.h:126 net_tx_action+0x7c9/0x980 net/core/dev.c:5685 handle_softirqs+0x286/0x870 kernel/softirq.c:579 do_softirq+0xec/0x180 kernel/softirq.c:480 __local_bh_enable_ip+0x17d/0x1c0 kernel/softirq.c:407 spin_unlock_bh include/linux/spinlock.h:396 [inline] netif_addr_unlock_bh include/linux/netdevice.h:4823 [inline] __dev_mc_add net/core/dev_addr_lists.c:873 [inline] dev_mc_add+0xd0/0x120 net/core/dev_addr_lists.c:886 igmp6_group_added+0x225/0x800 net/ipv6/mcast.c:681 __ipv6_dev_mc_inc+0x897/0xa50 net/ipv6/mcast.c:972 addrconf_join_solict net/ipv6/addrconf.c:2246 [inline] addrconf_dad_begin net/ipv6/addrconf.c:4099 [inline] addrconf_dad_work+0x3d0/0x14b0 net/ipv6/addrconf.c:4227 process_one_work kernel/workqueue.c:3263 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Tested on: commit: 590b221e Add linux-next specific files for 20250912 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1668b362580000 kernel config: https://syzkaller.appspot.com/x/.config?x=9134e501f17b95a4 dashboard link: https://syzkaller.appspot.com/bug?extid=78cae3f37c62ad092caa compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 patch: https://syzkaller.appspot.com/x/patch.diff?x=152a6362580000