From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f80.google.com (mail-ot1-f80.google.com [209.85.210.80]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6C8DB2D877B for ; Tue, 21 Apr 2026 15:35:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.80 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776785736; cv=none; b=D6WcEr6Uhb0nDLr1XVK0OsVC4Jb/mEZSmGRaPGkXAmI6wd+cUqR3DLCvv3vxa6OaQ9ozNSdoI4SyITS3uPe1zkVd5woECby2Kcf1E4im8XwSz9AwI8sshOgV3lJ3UUkBsx0Td2hc3pUswhogu+7egAj4CE3ppUxZTjKnnZDIz2E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776785736; c=relaxed/simple; bh=ONz262nZvHvEg1/NeRsSSEzdyhKAAtn6sRX6wRpZ4K4=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=kcBoj5XVicgMDfhfZ1B2JdFrPy+/ytC407JPlFvgVs0pSiSKQ3WS8ixn45f2Yqxv7I16XplnWxeJUtJiCJUsahS/YrX+Lq0l46P6WuJe2xVy3JrL1B36IpD13D4XS7dJRJ4JmmtgQ5kB0x8WDk7cz9IWfnHKlnR9qVL+GI+PeYQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.210.80 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-ot1-f80.google.com with SMTP id 46e09a7af769-7dcc8912143so3696073a34.3 for ; Tue, 21 Apr 2026 08:35:33 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1776785732; x=1777390532; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=aatkEaaCAqTNSI9UEPH2e59YLZz0ncVhPDdHHrU/4F0=; b=ExH0ZXcy+u56lMPCD22yGSVl6ePlWxOACq5huGzunz9a0uET5yIUo3Pze2lAZXX9KB V1CGOELidjm2OA2HzIyte9GzYxVtgIdfWrN2pMhbP3v07oMopnUNK3J7xKmeq6FxBqW8 0jWt5gVTMAUBSTW2n2/hSeNAw1IYvQx66zFEAHKfrCkFA/UOSP5QAMujsFMaLNALVDkP LP4e6Tg4YX/uwKZP9udX4hPDsRyWpqLL6S+78KR9HJMZM1bsYiBwHl/XYqePzC+5AnsV 0QL6vM2cKNm6kL6A5zPgowb4VLVEygU8EgDnLKHOXDnzYU1VL/gVGQdPm/IaBTIKwziQ xh0A== X-Forwarded-Encrypted: i=1; AFNElJ+LRj60/N/Lml848bzO/Wuk1a7EcFHh1a71Ql8AiqK6MUwQBNM0wGIEfiM6dkBnTimCo5xj4bI=@vger.kernel.org X-Gm-Message-State: AOJu0YwRt+eODGzUt1hyzg8RVwHTZ/HUbIwViRJc7tQdjL6M20r36Hpo fSSd6kCD41ar3Sqsdy4C88GcLkh9hhnpfS1rjne5R6sI/r0d1cIrMQL3ERHRkrbrQu2Zsin5e/T ZJFoOXhzNUcq09bB1hSHfZEMFUUSmCpuahzAsb670LY9EyPjd6pd4bNvwfyU= Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1b07:b0:67b:b0bd:8bd2 with SMTP id 006d021491bc7-69462f710eemr11161284eaf.59.1776785731841; Tue, 21 Apr 2026 08:35:31 -0700 (PDT) Date: Tue, 21 Apr 2026 08:35:31 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69e79943.a00a0220.17a17.0019.GAE@google.com> Subject: [syzbot] [net?] BUG: spinlock already unlocked in lec_atm_close From: syzbot To: davem@davemloft.net, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, 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: 1f5ffc672165 Fix mismerge of the arm64 / timer-core interr.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=12b85906580000 kernel config: https://syzkaller.appspot.com/x/.config?x=95729ed00549063a dashboard link: https://syzkaller.appspot.com/bug?extid=49a9c7b281bb147f8eb3 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/6b552538b97f/disk-1f5ffc67.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/724a3a1d69d7/vmlinux-1f5ffc67.xz kernel image: https://storage.googleapis.com/syzbot-assets/ea684969e2c2/bzImage-1f5ffc67.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+49a9c7b281bb147f8eb3@syzkaller.appspotmail.com BUG: spinlock already unlocked on CPU#0, syz.2.25/6044 lock: 0xffff888032ea0ea0, .magic: dead4ead, .owner: /-1, .owner_cpu: -1 CPU: 0 UID: 0 PID: 6044 Comm: syz.2.25 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 spin_bug kernel/locking/spinlock_debug.c:78 [inline] debug_spin_unlock kernel/locking/spinlock_debug.c:101 [inline] do_raw_spin_unlock+0x143/0x210 kernel/locking/spinlock_debug.c:141 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:177 [inline] _raw_spin_unlock_irqrestore+0x23/0x80 kernel/locking/spinlock.c:198 spin_unlock_irqrestore include/linux/spinlock.h:408 [inline] lec_arp_destroy net/atm/lec.c:1543 [inline] lec_atm_close+0x976/0x9e0 net/atm/lec.c:497 vcc_destroy_socket net/atm/common.c:181 [inline] vcc_release+0x10f/0x580 net/atm/common.c:205 svc_release+0x6c/0xd0 net/atm/svc.c:95 __sock_release net/socket.c:722 [inline] sock_close+0xc3/0x240 net/socket.c:1514 __fput+0x44f/0xa60 fs/file_table.c:510 task_work_run+0x1d9/0x270 kernel/task_work.c:233 get_signal+0x11eb/0x1330 kernel/signal.c:2811 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:328 [inline] do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1af9f9c819 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1afae30028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 00007f1afa215fa0 RCX: 00007f1af9f9c819 RDX: 0000000000000000 RSI: 00000000000061d0 RDI: 0000000000000005 RBP: 00007f1afa032c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f1afa216038 R14: 00007f1afa215fa0 R15: 00007ffdc6f7add8 ------------[ cut here ]------------ pvqspinlock: lock 0xffff888032ea0ea0 has corrupted value 0x0! WARNING: kernel/locking/qspinlock_paravirt.h:506 at __pv_queued_spin_unlock_slowpath+0x1a5/0x270 kernel/locking/qspinlock_paravirt.h:504, CPU#0: syz.2.25/6044 Modules linked in: CPU: 0 UID: 0 PID: 6044 Comm: syz.2.25 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:__pv_queued_spin_unlock_slowpath+0x1ce/0x270 kernel/locking/qspinlock_paravirt.h:504 Code: 04 48 89 df be 04 00 00 00 e8 4e 58 7b f6 48 89 d8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 87 00 00 00 8b 13 4c 89 f7 48 89 de <67> 48 0f b9 3a eb 98 48 c7 c7 30 c8 82 8e 4c 89 f6 4c 89 fa e8 f9 RSP: 0018:ffffc90005087920 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffff888032ea0ea0 RCX: ffffffff8bb5d542 RDX: 0000000000000000 RSI: ffff888032ea0ea0 RDI: ffffffff90357220 RBP: 1ffff110065d41d5 R08: ffff888032ea0ea3 R09: 1ffff110065d41d4 R10: dffffc0000000000 R11: ffffed10065d41d5 R12: dffffc0000000000 R13: dffffc0000000000 R14: ffffffff90357220 R15: ffff888032ea0ea8 FS: 00007f1afae306c0(0000) GS:ffff888125245000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1994be92f8 CR3: 000000007abce000 CR4: 00000000003526f0 Call Trace: __raw_callee_save___pv_queued_spin_unlock_slowpath+0x15/0x30 .slowpath+0x9/0x18 pv_queued_spin_unlock arch/x86/include/asm/paravirt-spinlock.h:40 [inline] queued_spin_unlock arch/x86/include/asm/paravirt-spinlock.h:72 [inline] do_raw_spin_unlock+0xf5/0x210 kernel/locking/spinlock_debug.c:142 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:177 [inline] _raw_spin_unlock_irqrestore+0x23/0x80 kernel/locking/spinlock.c:198 spin_unlock_irqrestore include/linux/spinlock.h:408 [inline] lec_arp_destroy net/atm/lec.c:1543 [inline] lec_atm_close+0x976/0x9e0 net/atm/lec.c:497 vcc_destroy_socket net/atm/common.c:181 [inline] vcc_release+0x10f/0x580 net/atm/common.c:205 svc_release+0x6c/0xd0 net/atm/svc.c:95 __sock_release net/socket.c:722 [inline] sock_close+0xc3/0x240 net/socket.c:1514 __fput+0x44f/0xa60 fs/file_table.c:510 task_work_run+0x1d9/0x270 kernel/task_work.c:233 get_signal+0x11eb/0x1330 kernel/signal.c:2811 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:328 [inline] do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1af9f9c819 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1afae30028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 00007f1afa215fa0 RCX: 00007f1af9f9c819 RDX: 0000000000000000 RSI: 00000000000061d0 RDI: 0000000000000005 RBP: 00007f1afa032c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f1afa216038 R14: 00007f1afa215fa0 R15: 00007ffdc6f7add8 ---------------- Code disassembly (best guess): 0: 04 48 add $0x48,%al 2: 89 df mov %ebx,%edi 4: be 04 00 00 00 mov $0x4,%esi 9: e8 4e 58 7b f6 call 0xf67b585c e: 48 89 d8 mov %rbx,%rax 11: 48 c1 e8 03 shr $0x3,%rax 15: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax 1a: 84 c0 test %al,%al 1c: 0f 85 87 00 00 00 jne 0xa9 22: 8b 13 mov (%rbx),%edx 24: 4c 89 f7 mov %r14,%rdi 27: 48 89 de mov %rbx,%rsi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: eb 98 jmp 0xffffffc9 31: 48 c7 c7 30 c8 82 8e mov $0xffffffff8e82c830,%rdi 38: 4c 89 f6 mov %r14,%rsi 3b: 4c 89 fa mov %r15,%rdx 3e: e8 .byte 0xe8 3f: f9 stc --- 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 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