From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f207.google.com (mail-il1-f207.google.com [209.85.166.207]) (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 AFAF722A804 for ; Tue, 3 Jun 2025 11:10:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.207 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748949036; cv=none; b=d/64XRxMjjKndNW7kSlPZcnGQeAbaV4sA+CM2XjS6cUBJYA23eSYH/G7nNTPb4l8vwxWNLeeH4fZqtVzvXotr+4bi2YaAx5eMDoIqHHc4ba5gtChGwnIDCb96PbL8fq2DjD6CFcd/cEWoN6y+OFCrkDGvfrGq84dxPpFVYAuAQw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748949036; c=relaxed/simple; bh=BNCUlxhZ6MRKA6nV8I3BNSL71w9PIu3On7WkBXlGqmI=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=cMZJ3gvL8XhnCS+m9cPSBrXgF+WvbPLmwOLC/zfoqNjbh+tQjfbfZTBAXkSrv3n4aBofkJGsjgsJpXlmMWaM+U4/FOk99cgcT9f89MoP0zWL07agzMBZrVGSsd0TDyz4w0RKftWGJHGh5LZKAf8yfgJibc7pBGIu5UuHARjQ7+w= 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=209.85.166.207 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-f207.google.com with SMTP id e9e14a558f8ab-3ddb8522720so12630135ab.2 for ; Tue, 03 Jun 2025 04:10:34 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1748949034; x=1749553834; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=sjqkPKKfGL6UKsOz6tntxTAr4cz7BoNXJ9xOc8bK7zE=; b=OYiw5CJXwGuyQSDmdkNfSRdMzf3jK6useyVGXeuKnESYxSHI2VhUU6+77hq2LdmoqK Oh/hXqyqAW4kRV9StmRMX1INyo2lg2nnKZ/pdFWWGKas20BZMnioEoAemr4g6ZZ0ul6r PpCEZOiyJDjXu/FRkPsvKy9DDLzzVsjwKelTOrxynxS7W/H5iOJrbFjwJfZ/cMQjouvm 4iLEDLDC1UpZxi1co4s5Lo8vf+XcM2zj368UThRT47wjVqCwnI/6yjFFxD2FuKj+Qsf/ PSlDAGDZbe2O946AmT8CxFhae9GyZ4uxz+q/mKL7UlakKBoPc/WpdHyJeMNc+1H/WNI4 JMsw== X-Forwarded-Encrypted: i=1; AJvYcCVI2vUA/qKrkgRlbBGsGvdbCqlSO1bUXvljb4YI6sM51ZmmflRKQ3qAtATKzCkkemh5lXfq2zE=@vger.kernel.org X-Gm-Message-State: AOJu0YwV78+Aj8/cGx/0UsLrVMwuV4W7++e3TF7qfoL0HmsU9euCbA/u GlAhSt0oiO6ArLp8WyZL3S8FYQ760oBlIMgYllPvDwjQLscuzd7c99N1XyiBDjSpDsGI18/GCFn 4aESp3hRtlxAnITi5pK+ddYgakvRT0p2vF8+PUAKyOj2Hhu4+F06dTSpw33U= X-Google-Smtp-Source: AGHT+IFOJwmyjFxjskp3g2tFSkQuJwlZqA7Cg9uOzjOV9WdxsZ9HH3JUzqmOqVCwd/tIakPEIcqnTkKGYBJD3XLsIE5lBANmjWzD Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:380d:b0:3dc:76c6:436f with SMTP id e9e14a558f8ab-3dda3394b74mr118384375ab.21.1748949033940; Tue, 03 Jun 2025 04:10:33 -0700 (PDT) Date: Tue, 03 Jun 2025 04:10:33 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <683ed829.a00a0220.d8eae.006c.GAE@google.com> Subject: [syzbot] [net?] general protection fault in __igmp_group_dropped 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: d00a83477e7a Merge tag 'input-for-v6.16-rc0' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12f0dc82580000 kernel config: https://syzkaller.appspot.com/x/.config?x=4df26174733e11f3 dashboard link: https://syzkaller.appspot.com/bug?extid=b7da0e231ae4e5a9917f 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 (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-d00a8347.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9ac727dc51c3/vmlinux-d00a8347.xz kernel image: https://storage.googleapis.com/syzbot-assets/8981faa6f0a2/bzImage-d00a8347.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b7da0e231ae4e5a9917f@syzkaller.appspotmail.com bridge0: port 2(bridge_slave_1) entered disabled state bridge_slave_0: left allmulticast mode bridge_slave_0: left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state Oops: general protection fault, probably for non-canonical address 0xdffffc0000000021: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f] CPU: 0 UID: 0 PID: 6857 Comm: kworker/u32:24 Not tainted 6.15.0-syzkaller-10954-gd00a83477e7a #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: netns cleanup_net RIP: 0010:read_pnet include/net/net_namespace.h:409 [inline] RIP: 0010:dev_net include/linux/netdevice.h:2713 [inline] RIP: 0010:__igmp_group_dropped+0xcd/0xe80 net/ipv4/igmp.c:1298 Code: 3c 02 00 0f 85 10 0c 00 00 4d 8b 2c 24 e8 cb 5b 80 01 48 b8 00 00 00 00 00 fc ff df 49 8d bd 08 01 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 db 0b 00 00 48 8d bb db 00 00 00 4d 8b bd 08 01 RSP: 0018:ffffc9000408f5d8 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff888062ee0600 RCX: ffffffff89fda2e7 RDX: 0000000000000021 RSI: ffffffff89fd05dc RDI: 0000000000000108 RBP: 1ffff92000811ebe R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: ffff888053fdf000 R13: 0000000000000000 R14: 0000000000000001 R15: ffff88802bef0418 FS: 0000000000000000(0000) GS:ffff8880d6765000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000000 CR3: 000000000e382000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: igmp_group_dropped net/ipv4/igmp.c:1335 [inline] ip_mc_down+0xc0/0x3c0 net/ipv4/igmp.c:1829 inetdev_event+0x3b2/0x18a0 net/ipv4/devinet.c:1642 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] dev_close_many+0x319/0x630 net/core/dev.c:1785 unregister_netdevice_many_notify+0x578/0x26f0 net/core/dev.c:12046 ops_exit_rtnl_list net/core/net_namespace.c:188 [inline] ops_undo_list+0x8fc/0xab0 net/core/net_namespace.c:249 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+0x5d7/0x6f0 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:read_pnet include/net/net_namespace.h:409 [inline] RIP: 0010:dev_net include/linux/netdevice.h:2713 [inline] RIP: 0010:__igmp_group_dropped+0xcd/0xe80 net/ipv4/igmp.c:1298 Code: 3c 02 00 0f 85 10 0c 00 00 4d 8b 2c 24 e8 cb 5b 80 01 48 b8 00 00 00 00 00 fc ff df 49 8d bd 08 01 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 db 0b 00 00 48 8d bb db 00 00 00 4d 8b bd 08 01 RSP: 0018:ffffc9000408f5d8 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff888062ee0600 RCX: ffffffff89fda2e7 RDX: 0000000000000021 RSI: ffffffff89fd05dc RDI: 0000000000000108 RBP: 1ffff92000811ebe R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: ffff888053fdf000 R13: 0000000000000000 R14: 0000000000000001 R15: ffff88802bef0418 FS: 0000000000000000(0000) GS:ffff8880d6965000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000003233b000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 3c 02 cmp $0x2,%al 2: 00 0f add %cl,(%rdi) 4: 85 10 test %edx,(%rax) 6: 0c 00 or $0x0,%al 8: 00 4d 8b add %cl,-0x75(%rbp) b: 2c 24 sub $0x24,%al d: e8 cb 5b 80 01 call 0x1805bdd 12: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 19: fc ff df 1c: 49 8d bd 08 01 00 00 lea 0x108(%r13),%rdi 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 db 0b 00 00 jne 0xc0f 34: 48 8d bb db 00 00 00 lea 0xdb(%rbx),%rdi 3b: 4d rex.WRB 3c: 8b .byte 0x8b 3d: bd .byte 0xbd 3e: 08 01 or %al,(%rcx) --- 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