From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f205.google.com (mail-il1-f205.google.com [209.85.166.205]) (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 8115B20010A for ; Wed, 4 Jun 2025 19:25:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.205 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749065129; cv=none; b=nNcQnUWRqRefplXRVw/Lc3FGLlY1hAjMpIApY2HM/R1LMfveXJ5tb/97Ma/rH0iYZw2tdbDxObPGIe4Aj/CU+GDx6UeipmSwT9lpJc+LkwYcZetOBmmY+5atmtTW3b4ktyc+c80AIWCirIS/Qpp2Dr4zSbjVCs95SXUXbXM3ces= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749065129; c=relaxed/simple; bh=zfjUY8IckOSgrzCcNtle40WLudtu15Y3A74l/Zn9SDA=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=VAW/TfaJvs8aMpWqexV+GfSPTrqZ8Rre2ovwVl64nwiu+3iCIcjeD9YF3gtV+Ge9oaRC3DJpqDQf7gWgFMm+VSWfg7EpuDECFXyUtzYlg6vycVV1YA/A+s8dZjb13UALsvdzF6Al+J5q2xr02bq6JjduUjAFPdnxPi1yIx/Qj00= 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=209.85.166.205 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-il1-f205.google.com with SMTP id e9e14a558f8ab-3ddc1af1e5bso5514175ab.0 for ; Wed, 04 Jun 2025 12:25:27 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1749065126; x=1749669926; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=P2XR+6/sdiawy8JEJk3AuMB0Odiprm5OieWbN+7SdAk=; b=k2Cx1TAiH6it6jLkGF/xnsH9t6Ls5aAzX2nYxHa5VW5f4MP1WYLjQamUJsXrcN0kYw V9z8IpGKay5bcfG5H53uaHf2xd2chJiaKNh5fVPb+PuOSFImc8+AmEeU6nV5IFHk2xXr BJtl6OHnIXIHe7aKPd2dYgAvYzLMkhOoHArxG6WfG8wyBhJ3a87rxsHk0f3BZE2vblax pRA4TL7Mbn69y0qtcTNYaittZ5jgXTvKAR6VzchmUnWh2ChICXzYlP9SZX/za2v+jroB uBYuLfy+ENAnipdugptVapbQcEvLlOdyEL/Pwr8yQCrXc4L2dYv45VlnmLgNyJztYJdY b69w== X-Forwarded-Encrypted: i=1; AJvYcCU3/K68Ro9+N1azaOrmcI3WENhGBlm4JFI7FgIjlZrXcykA6Ygd4rlj6ItpD8QLNKIgrrnkcgA=@vger.kernel.org X-Gm-Message-State: AOJu0YzsMIO+I6uT1t33Vudn59ohmaQd+ShN/KI4VKVCyUX89r2h7tqw Olen6dDUSNo7vEWhJVr3dRXYLD+WnjAoSaGqu0JPgk1G0n91cKU15F/5v1YBZzwMXPy/cwDOu5T 9ZsN5ELo3lTFOP7zx7RvI8MO6PF22bKahrwbA06gryiMvQWzLUDL5AiIb1HE= X-Google-Smtp-Source: AGHT+IFe8qYtlyOo7T34Lw+1Scx6V+wnlRhsRMmjumeb8eiOEbbYWTkFLZqR5xMrbfsN1uXgI5FnLRpWt6B1HXmP/Jfxch5Bfp8q Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:188d:b0:3dd:920f:d28e with SMTP id e9e14a558f8ab-3ddbfc504f2mr41743775ab.13.1749065126557; Wed, 04 Jun 2025 12:25:26 -0700 (PDT) Date: Wed, 04 Jun 2025 12:25:26 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68409da6.a00a0220.68b4a.0009.GAE@google.com> Subject: [syzbot] [net?] general protection fault in ip6_mc_clear_src (2) From: syzbot To: davem@davemloft.net, dsahern@kernel.org, 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: 1af80d00e1e0 Merge tag 'slab-for-6.16' of git://git.kernel.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15259282580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c3a43fc2c7a5747d dashboard link: https://syzkaller.appspot.com/bug?extid=cea6d5c85e63d691dfc1 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/71ae01bedc1a/disk-1af80d00.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e4e400b63650/vmlinux-1af80d00.xz kernel image: https://storage.googleapis.com/syzbot-assets/ee506a0eb7e1/bzImage-1af80d00.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+cea6d5c85e63d691dfc1@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc001fffe000: 0000 [#1] SMP KASAN NOPTI KASAN: probably user-memory-access in range [0x00000000ffff0000-0x00000000ffff0007] CPU: 0 UID: 0 PID: 1099 Comm: kworker/u8:6 Not tainted 6.15.0-syzkaller-11802-g1af80d00e1e0 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: netns cleanup_net RIP: 0010:ip6_mc_clear_src+0x89/0x5a0 net/ipv6/mcast.c:2599 Code: 49 bc 00 00 00 00 00 fc ff df 48 8d 45 10 49 89 c5 48 89 04 24 49 c1 ed 03 4d 01 e5 eb 32 e8 3e 55 88 f7 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 80 04 00 00 4c 8b 3b 48 8d 7b 30 48 89 de e8 RSP: 0018:ffffc90004067308 EFLAGS: 00010206 RAX: 000000001fffe000 RBX: 00000000ffff0000 RCX: ffffffff8a33c19b RDX: ffff888028444880 RSI: ffffffff8a33c122 RDI: 0000000000000005 RBP: ffff88802af2f800 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000 R13: ffffed10055e5f02 R14: ffff88802af2f828 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff888124765000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000002e5030 CR3: 000000002a0c0000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: mld_clear_delrec+0xfb/0x640 net/ipv6/mcast.c:826 ipv6_mc_destroy_dev+0x49/0x690 net/ipv6/mcast.c:2842 addrconf_ifdown.isra.0+0x13ef/0x1a90 net/ipv6/addrconf.c:4000 addrconf_notify+0x220/0x19e0 net/ipv6/addrconf.c:3780 notifier_call_chain+0xbc/0x410 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230 call_netdevice_notifiers_extack net/core/dev.c:2268 [inline] call_netdevice_notifiers net/core/dev.c:2282 [inline] unregister_netdevice_many_notify+0xf9a/0x26f0 net/core/dev.c:12076 unregister_netdevice_many net/core/dev.c:12139 [inline] unregister_netdevice_queue+0x305/0x3f0 net/core/dev.c:11983 unregister_netdevice include/linux/netdevice.h:3379 [inline] nsim_destroy+0x197/0x5d0 drivers/net/netdevsim/netdev.c:1068 __nsim_dev_port_del+0x189/0x240 drivers/net/netdevsim/dev.c:1428 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1440 [inline] nsim_dev_reload_destroy+0x10a/0x4d0 drivers/net/netdevsim/dev.c:1661 nsim_dev_reload_down+0x6e/0xd0 drivers/net/netdevsim/dev.c:968 devlink_reload+0x1a1/0x7c0 net/devlink/dev.c:461 devlink_pernet_pre_exit+0x1a0/0x2b0 net/devlink/core.c:509 ops_pre_exit_list net/core/net_namespace.c:162 [inline] ops_undo_list+0x187/0xab0 net/core/net_namespace.c:235 cleanup_net+0x408/0x890 net/core/net_namespace.c:686 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3321 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402 kthread+0x3c5/0x780 kernel/kthread.c:464 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ip6_mc_clear_src+0x89/0x5a0 net/ipv6/mcast.c:2599 Code: 49 bc 00 00 00 00 00 fc ff df 48 8d 45 10 49 89 c5 48 89 04 24 49 c1 ed 03 4d 01 e5 eb 32 e8 3e 55 88 f7 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 80 04 00 00 4c 8b 3b 48 8d 7b 30 48 89 de e8 RSP: 0018:ffffc90004067308 EFLAGS: 00010206 RAX: 000000001fffe000 RBX: 00000000ffff0000 RCX: ffffffff8a33c19b RDX: ffff888028444880 RSI: ffffffff8a33c122 RDI: 0000000000000005 RBP: ffff88802af2f800 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000 R13: ffffed10055e5f02 R14: ffff88802af2f828 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff888124865000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000404030 CR3: 0000000034f3f000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 49 bc 00 00 00 00 00 movabs $0xdffffc0000000000,%r12 7: fc ff df a: 48 8d 45 10 lea 0x10(%rbp),%rax e: 49 89 c5 mov %rax,%r13 11: 48 89 04 24 mov %rax,(%rsp) 15: 49 c1 ed 03 shr $0x3,%r13 19: 4d 01 e5 add %r12,%r13 1c: eb 32 jmp 0x50 1e: e8 3e 55 88 f7 call 0xf7885561 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2f: 0f 85 80 04 00 00 jne 0x4b5 35: 4c 8b 3b mov (%rbx),%r15 38: 48 8d 7b 30 lea 0x30(%rbx),%rdi 3c: 48 89 de mov %rbx,%rsi 3f: e8 .byte 0xe8 --- 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