linux-kernel - [syzbot] [net?] [nfs?] WARNING in remove_proc

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Message-ID: <684b41cf.a00a0220.1eb5f5.0109.GAE@google.com>
Date: Thu, 12 Jun 2025 14:08:31 -0700
From: syzbot <syzbot+a4cc4ac22daa4a71b87c@...kaller.appspotmail.com>
To: Dai.Ngo@...cle.com, anna@...nel.org, chuck.lever@...cle.com, 
	davem@...emloft.net, edumazet@...gle.com, horms@...nel.org, 
	jlayton@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org, 
	linux-nfs@...r.kernel.org, neil@...wn.name, netdev@...r.kernel.org, 
	okorniev@...hat.com, pabeni@...hat.com, syzkaller-bugs@...glegroups.com, 
	tom@...pey.com, trondmy@...nel.org
Subject: [syzbot] [net?] [nfs?] WARNING in remove_proc_entry (8)

Hello,

syzbot found the following issue on:

HEAD commit:    2c4a1f3fe03e Merge tag 'bpf-fixes' of git://git.kernel.org..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1432610c580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c4c8362784bb7796
dashboard link: https://syzkaller.appspot.com/bug?extid=a4cc4ac22daa4a71b87c
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=1126ed70580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/cd1ec81a3ab8/disk-2c4a1f3f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/992d9b6a25bf/vmlinux-2c4a1f3f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/85a9bf583faa/bzImage-2c4a1f3f.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a4cc4ac22daa4a71b87c@...kaller.appspotmail.com

WARNING: CPU: 0 PID: 6182 at fs/proc/generic.c:727 remove_proc_entry+0x45e/0x530 fs/proc/generic.c:727
Modules linked in:
CPU: 0 UID: 0 PID: 6182 Comm: syz.1.75 Not tainted 6.16.0-rc1-syzkaller-00010-g2c4a1f3fe03e #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:remove_proc_entry+0x45e/0x530 fs/proc/generic.c:727
Code: 3c 02 00 0f 85 85 00 00 00 48 8b 93 d8 00 00 00 4d 89 f0 4c 89 e9 48 c7 c6 40 ba a2 8b 48 c7 c7 60 b9 a2 8b e8 33 81 1d ff 90 <0f> 0b 90 90 e9 5f fe ff ff e8 04 69 5e ff 90 48 b8 00 00 00 00 00
RSP: 0018:ffffc90003e5fb08 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff88804e6568c0 RCX: ffffffff817a92c8
RDX: ffff88803046da00 RSI: ffffffff817a92d5 RDI: 0000000000000001
RBP: ffff8880353bde80 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffff8880353bddc0
R13: ffff8880353bdea4 R14: ffff88802556cae4 R15: dffffc0000000000
FS:  0000555562486500(0000) GS:ffff888124962000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c0024fb070 CR3: 000000006b39a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 sunrpc_exit_net+0x46/0x90 net/sunrpc/sunrpc_syms.c:76
 ops_exit_list net/core/net_namespace.c:200 [inline]
 ops_undo_list+0x2eb/0xab0 net/core/net_namespace.c:253
 setup_net+0x2e1/0x510 net/core/net_namespace.c:457
 copy_net_ns+0x2a6/0x5f0 net/core/net_namespace.c:574
 create_new_namespaces+0x3ea/0xa90 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xc0/0x1f0 kernel/nsproxy.c:218
 ksys_unshare+0x45b/0xa40 kernel/fork.c:3121
 __do_sys_unshare kernel/fork.c:3192 [inline]
 __se_sys_unshare kernel/fork.c:3190 [inline]
 __x64_sys_unshare+0x31/0x40 kernel/fork.c:3190
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f239858e929
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd08ac9b18 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007f23987b5fa0 RCX: 00007f239858e929
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000080
RBP: 00007f2398610b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f23987b5fa0 R14: 00007f23987b5fa0 R15: 0000000000000001
 </TASK>


---
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