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AKwUvBx0AS5glHkrKs0PrqyjWf4DT+mUnSAeyC1IHGWWMQViTe8vkpKKd5rh25G3F7SxU/81olARkWaJ+8eUd6s=@vger.kernel.org X-Gm-Message-State: AFuF++k0xwNBiiC7jOmBmvLmv85EWINjC6G+4ISpTSb8gMF49OQTu749 OulPpy4l33VAyuG+Hqvn7Xp2OxsfI2a8pAcOaWsjKiWVUR11kypKpHF5ArlF3MxLFlSV030PBzF J/eV0lYGpibnrsP8wGzIe+D/jZLsc96iDmB4XSdVmYjE97bfxUDj9alFd3Nk= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:bc8:b0:4b3:1e40:640b with SMTP id 5614622812f47-4c7b34d5ff9mr1493286b6e.6.1789388496650; Mon, 14 Sep 2026 05:21:36 -0700 (PDT) Date: Mon, 14 Sep 2026 05:21:36 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6aa7e6d0.4c28b7d0.c1bba.001c.GAE@google.com> Subject: [syzbot] [x25?] BUG: sleeping function called from invalid context in x25_kill_by_neigh From: syzbot To: davem@davemloft.net, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-x25@vger.kernel.org, ms@dev.tdt.de, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 50d05c7c76c9 Merge tag 'landlock-7.3-rc3' of git://git.ker.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=14abb749580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b454dc6b1b7acd30 dashboard link: https://syzkaller.appspot.com/bug?extid=9faa82ae2e94c5c7d2ef compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12445ef9580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16445ef9580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/7171282977df/disk-50d05c7c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/eb180d9b54d5/vmlinux-50d05c7c.xz kernel image: https://storage.googleapis.com/syzbot-assets/ff1f279b8f9e/bzImage-50d05c7c.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9faa82ae2e94c5c7d2ef@syzkaller.appspotmail.com BUG: sleeping function called from invalid context at net/core/sock.c:3832 in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 29, name: ktimers/1 preempt_count: 0, expected: 0 RCU nest depth: 2, expected: 0 locks held by ktimers/1/29: 4, last CPU#1: #0: ffffffff8e0594c0 (local_bh){.+.+}-{1:3}, at: __local_bh_disable_ip+0x3d/0x420 kernel/softirq.c:186 #1: ffffffff8e1c3c40 (rcu_read_lock){....}-{1:3}, at: __local_bh_disable_ip+0x3d/0x420 kernel/softirq.c:186 #2: ffffffff8e1c3c40 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline] #2: ffffffff8e1c3c40 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #2: ffffffff8e1c3c40 (rcu_read_lock){....}-{1:3}, at: netif_receive_skb_core+0x33/0x2b0 net/core/dev.c:6288 #3: ffff888038d40358 (sk_lock-AF_X25){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline] #3: ffff888038d40358 (sk_lock-AF_X25){+.+.}-{0:0}, at: x25_kill_by_neigh+0x134/0x2a0 net/x25/af_x25.c:1778 CPU: 1 UID: 0 PID: 29 Comm: ktimers/1 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 __might_resched+0x31b/0x470 kernel/sched/core.c:9256 lock_sock_nested+0x56/0x130 net/core/sock.c:3832 lock_sock include/net/sock.h:1713 [inline] x25_kill_by_neigh+0x134/0x2a0 net/x25/af_x25.c:1778 x25_lapb_receive_frame+0x1b0/0xfb0 net/x25/x25_dev.c:138 __netif_receive_skb_one_core net/core/dev.c:6264 [inline] netif_receive_skb_core+0x2a6/0x2b0 net/core/dev.c:6289 lapbeth_napi_poll+0x45/0x90 drivers/net/wan/lapbether.c:100 __napi_poll+0xae/0x550 net/core/dev.c:7787 napi_poll net/core/dev.c:7850 [inline] net_rx_action+0x621/0xd70 net/core/dev.c:8007 handle_softirqs+0x1da/0x6d0 kernel/softirq.c:645 __do_softirq kernel/softirq.c:679 [inline] run_ktimerd+0x6a/0x100 kernel/softirq.c:1174 smpboot_thread_fn+0x565/0xa70 kernel/smpboot.c:160 kthread+0x38b/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup