netdev - [syzbot] WARNING in remove_proc

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Message-ID: <0000000000009afa3c05f3c5988a@google.com>
Date:   Thu, 02 Feb 2023 22:14:37 -0800
From:   syzbot <syzbot+04a8437497bcfb4afa95@...kaller.appspotmail.com>
To:     anna@...nel.org, chuck.lever@...cle.com, davem@...emloft.net,
        edumazet@...gle.com, jlayton@...nel.org, kuba@...nel.org,
        linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org,
        netdev@...r.kernel.org, pabeni@...hat.com,
        syzkaller-bugs@...glegroups.com, trond.myklebust@...merspace.com
Subject: [syzbot] WARNING in remove_proc_entry (5)

Hello,

syzbot found the following issue on:

HEAD commit:    80bd9028feca Add linux-next specific files for 20230131
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=10a0f7ae480000
kernel config:  https://syzkaller.appspot.com/x/.config?x=904dc2f450eaad4a
dashboard link: https://syzkaller.appspot.com/bug?extid=04a8437497bcfb4afa95
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/924618188238/disk-80bd9028.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/7a03cf86e545/vmlinux-80bd9028.xz
kernel image: https://storage.googleapis.com/syzbot-assets/568e80043a41/bzImage-80bd9028.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+04a8437497bcfb4afa95@...kaller.appspotmail.com

------------[ cut here ]------------
name 'gss_krb5_enctypes'
WARNING: CPU: 0 PID: 6187 at fs/proc/generic.c:712 remove_proc_entry+0x38d/0x460 fs/proc/generic.c:712
Modules linked in:
CPU: 0 PID: 6187 Comm: syz-executor.4 Not tainted 6.2.0-rc6-next-20230131-syzkaller-09515-g80bd9028feca #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
RIP: 0010:remove_proc_entry+0x38d/0x460 fs/proc/generic.c:712
Code: e9 6d fe ff ff e8 63 f1 7c ff 48 c7 c7 e0 6d 98 8c e8 47 ba 0b 08 e8 52 f1 7c ff 4c 89 e6 48 c7 c7 c0 85 5e 8a e8 53 8c 44 ff <0f> 0b e9 a4 fe ff ff e8 37 f1 7c ff 48 8d bd d8 00 00 00 48 b8 00
RSP: 0018:ffffc90015dcf8c8 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 1ffff92002bb9f1b RCX: ffffc9000c579000
RDX: 0000000000040000 RSI: ffffffff81692aec RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000000 R12: ffffffff8b75c440
R13: dffffc0000000000 R14: dffffc0000000000 R15: fffffbfff1c6d918
FS:  00007fe943910700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2d14a16984 CR3: 0000000029c4e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 destroy_krb5_enctypes_proc_entry net/sunrpc/auth_gss/svcauth_gss.c:1543 [inline]
 gss_svc_shutdown_net+0x7d/0x2b0 net/sunrpc/auth_gss/svcauth_gss.c:2120
 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:169
 setup_net+0x9bd/0xe60 net/core/net_namespace.c:356
 copy_net_ns+0x320/0x6b0 net/core/net_namespace.c:483
 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
 copy_namespaces+0x410/0x500 kernel/nsproxy.c:179
 copy_process+0x311d/0x76b0 kernel/fork.c:2272
 kernel_clone+0xeb/0x9a0 kernel/fork.c:2684
 __do_sys_clone+0xba/0x100 kernel/fork.c:2825
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fe942c8c0c9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe943910118 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fe942dabf80 RCX: 00007fe942c8c0c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000071801000
RBP: 00007fe942ce7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ffe8ccafb1f R14: 00007fe943910300 R15: 0000000000022000
 </TASK>


---
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