Message-ID: <674e13c0.050a0220.48a03.0029.GAE@google.com>
Date: Mon, 02 Dec 2024 12:08:32 -0800
From: syzbot <syzbot+6e8cb445d4b43d006e0c@...kaller.appspotmail.com>
To: davem@...emloft.net, dsahern@...nel.org, edumazet@...gle.com, 
	horms@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org, 
	netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [net?] WARNING in ip6mr_free_table

Hello,

syzbot found the following issue on:

HEAD commit:    7af08b57bcb9 Merge tag 'trace-v6.13-2' of git://git.kernel..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=105733c0580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ae452ddde099ccb1
dashboard link: https://syzkaller.appspot.com/bug?extid=6e8cb445d4b43d006e0c
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16d04d30580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=142fcf78580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/dc5dc75196ac/disk-7af08b57.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/63b4670d0126/vmlinux-7af08b57.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f9d6e3a842d9/bzImage-7af08b57.xz

The issue was bisected to:

commit 11b6e701bce96f98474084f26821157cb0dccf69
Author: Paolo Abeni <pabeni@...hat.com>
Date:   Sun Nov 24 15:40:56 2024 +0000

    ipmr: add debug check for mr table cleanup

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1443e9e8580000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=1643e9e8580000
console output: https://syzkaller.appspot.com/x/log.txt?x=1243e9e8580000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6e8cb445d4b43d006e0c@...kaller.appspotmail.com
Fixes: 11b6e701bce9 ("ipmr: add debug check for mr table cleanup")

------------[ cut here ]------------
WARNING: CPU: 0 PID: 7478 at net/ipv6/ip6mr.c:419 ip6mr_free_table+0xbd/0x120 net/ipv6/ip6mr.c:419
Modules linked in:
CPU: 0 UID: 0 PID: 7478 Comm: syz-executor212 Not tainted 6.12.0-syzkaller-10689-g7af08b57bcb9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:ip6mr_free_table+0xbd/0x120 net/ipv6/ip6mr.c:419
Code: 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 58 49 83 bc 24 c0 0e 00 00 00 74 09 e8 94 fe a9 f7 90 <0f> 0b 90 e8 8b fe a9 f7 48 8d 7b 38 e8 f2 be 96 f7 48 89 df be 0f
RSP: 0018:ffffc9000ca37820 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888071720000 RCX: ffffffff89e4c674
RDX: ffff888030d1a440 RSI: ffffffff89e4c6ac RDI: ffff88802b0ccb40
RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffff88802b0cbc80
R13: ffff888071720000 R14: ffff888071720008 R15: dead000000000100
FS:  00007f8e0d5626c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc0ae64c68 CR3: 000000007c576000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ip6mr_rules_exit+0x176/0x2d0 net/ipv6/ip6mr.c:283
 ip6mr_net_exit_batch+0x53/0xa0 net/ipv6/ip6mr.c:1388
 ops_exit_list+0x128/0x180 net/core/net_namespace.c:177
 setup_net+0x4fe/0x860 net/core/net_namespace.c:394
 copy_net_ns+0x2b4/0x6b0 net/core/net_namespace.c:500
 create_new_namespaces+0x3ea/0xad0 kernel/nsproxy.c:110
 copy_namespaces+0x468/0x560 kernel/nsproxy.c:179
 copy_process+0x2a11/0x8df0 kernel/fork.c:2398
 kernel_clone+0xfd/0x960 kernel/fork.c:2807
 __do_sys_clone+0xba/0x100 kernel/fork.c:2950
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8e0d5a7419
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8e0d562238 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f8e0d631328 RCX: 00007f8e0d5a7419
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040020000
RBP: 00007f8e0d631320 R08: 0000000000000000 R09: 00007f8e0d5626c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8e0d5fe074
R13: 0000000000000000 R14: 00007ffc0ae64ba0 R15: 00007ffc0ae64c88
 </TASK>


---
This report is generated by a bot. It may contain errors.
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For information about bisection process see: https://goo.gl/tpsmEJ#bisection

If the report is already addressed, let syzbot know by replying with:
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