linux-kernel - Re: [syzbot] [net?] WARNING in ipmr_rules

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Message-ID: <c5bc7d2e-6a2e-4d33-a5bc-14bd61be3a0c@redhat.com>
Date: Tue, 3 Jun 2025 17:36:11 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: syzbot <syzbot+a25af2d6c990a65eca95@...kaller.appspotmail.com>,
 davem@...emloft.net, dsahern@...nel.org, edumazet@...gle.com,
 horms@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org,
 linux-usb@...r.kernel.org, netdev@...r.kernel.org,
 syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] WARNING in ipmr_rules_exit (2)

On 6/3/25 5:31 PM, syzbot wrote:
> syzbot found the following issue on:
> 
> HEAD commit:    342e4955a1f1 usb: usbtmc: Fix timeout value in get_stb
> git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
> console output: https://syzkaller.appspot.com/x/log.txt?x=135a19f4580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=cc73a376913a3005
> dashboard link: https://syzkaller.appspot.com/bug?extid=a25af2d6c990a65eca95
> 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/3d4486b9330e/disk-342e4955.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/b0b416348409/vmlinux-342e4955.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/053a330bcf59/bzImage-342e4955.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+a25af2d6c990a65eca95@...kaller.appspotmail.com
> 
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 13600 at net/ipv4/ipmr.c:440 ipmr_free_table net/ipv4/ipmr.c:440 [inline]
> WARNING: CPU: 0 PID: 13600 at net/ipv4/ipmr.c:440 ipmr_rules_exit+0x13a/0x1c0 net/ipv4/ipmr.c:361
> Modules linked in:
> 
> CPU: 0 UID: 0 PID: 13600 Comm: syz-executor Not tainted 6.15.0-rc6-syzkaller-00166-g342e4955a1f1 #0 PREEMPT(voluntary) 
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
> RIP: 0010:ipmr_free_table net/ipv4/ipmr.c:440 [inline]
> RIP: 0010:ipmr_rules_exit+0x13a/0x1c0 net/ipv4/ipmr.c:361
> Code: ff df 48 c1 ea 03 80 3c 02 00 75 7c 48 c7 85 58 09 00 00 00 00 00 00 5b 5d 41 5c 41 5d 41 5e c3 cc cc cc cc e8 d7 79 16 fb 90 <0f> 0b 90 eb 93 e8 cc 79 16 fb 0f b6 1d 73 37 05 04 31 ff 89 de e8
> RSP: 0018:ffffc90014e2fc10 EFLAGS: 00010293
> 
> RAX: 0000000000000000 RBX: ffff88812c1dc000 RCX: ffffffff8665f0fd
> RDX: ffff8881222c9d40 RSI: ffffffff8665f169 RDI: 0000000000000005
> RBP: ffff88812ea70000 R08: 0000000000000005 R09: 0000000000000000
> R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001
> R13: ffff88812ea70958 R14: ffff88812ea70000 R15: fffffbfff148e04c
> FS:  000055558afcb500(0000) GS:ffff8882691c2000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007fc07c1d33d0 CR3: 000000014620e000 CR4: 00000000003506f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>  <TASK>
>  ipmr_net_exit_batch+0x53/0xa0 net/ipv4/ipmr.c:3160
>  ops_exit_list+0x128/0x180 net/core/net_namespace.c:177
>  setup_net+0x4e8/0x850 net/core/net_namespace.c:396
>  copy_net_ns+0x2a6/0x5f0 net/core/net_namespace.c:518
>  create_new_namespaces+0x3ea/0xad0 kernel/nsproxy.c:110
>  unshare_nsproxy_namespaces+0xc0/0x1f0 kernel/nsproxy.c:228
>  ksys_unshare+0x45b/0xa40 kernel/fork.c:3375
>  __do_sys_unshare kernel/fork.c:3446 [inline]
>  __se_sys_unshare kernel/fork.c:3444 [inline]
>  __x64_sys_unshare+0x31/0x40 kernel/fork.c:3444
>  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
>  do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f31d7a50167
> Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 10 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007ffe9bbc8f18 EFLAGS: 00000206
>  ORIG_RAX: 0000000000000110
> RAX: ffffffffffffffda RBX: 00007f31d7c75f40 RCX: 00007f31d7a50167
> RDX: 0000000000000005 RSI: 00007ffe9bbc8de0 RDI: 0000000040000000
> RBP: 00007f31d7c76738 R08: 00007f31d87a7d60 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000008
> R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000000
>  </TASK>
> 
> 
> ---
> 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@...glegroups.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

#syz fix: mr: consolidate the ipmr_can_free_table() checks.