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

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Message-ID: <000000000000f403b005f8ce9d9a@google.com>
Date:   Sat, 08 Apr 2023 01:06:20 -0700
From:   syzbot <syzbot+7e1e1bdb852961150198@...kaller.appspotmail.com>
To:     hdanton@...a.com, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] WARNING in cleanup_net (2)

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in cleanup_net

 __sock_create+0x380/0x850 net/socket.c:1545
 __smc_create net/smc/af_smc.c:3267 [inline]
 smc_create+0x1fc/0x2d0 net/smc/af_smc.c:3284
 __sock_create+0x380/0x850 net/socket.c:1545
 sock_create net/socket.c:1596 [inline]
 __sys_socket_create net/socket.c:1633 [inline]
 __sys_socket_create net/socket.c:1618 [inline]
 __sys_socket+0x133/0x250 net/socket.c:1661
 __do_sys_socket net/socket.c:1674 [inline]
 __se_sys_socket net/socket.c:1672 [inline]
 __x64_sys_socket+0x73/0xb0 net/socket.c:1672
 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
------------[ cut here ]------------
WARNING: CPU: 0 PID: 11 at lib/ref_tracker.c:39 spin_unlock_irqrestore include/linux/spinlock.h:405 [inline]
WARNING: CPU: 0 PID: 11 at lib/ref_tracker.c:39 ref_tracker_dir_exit+0x3a2/0x600 lib/ref_tracker.c:38
Modules linked in:
CPU: 0 PID: 11 Comm: kworker/u4:1 Not tainted 6.3.0-rc3-syzkaller-00148-gf33642224e38-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
Workqueue: netns cleanup_net
RIP: 0010:ref_tracker_dir_exit+0x3a2/0x600 lib/ref_tracker.c:39
Code: 0f 84 c3 fe ff ff e8 2d 3d 44 fd 44 89 ff e8 c5 f9 ff ff e9 b1 fe ff ff e8 1b 3d 44 fd 48 8b 74 24 10 4c 89 ef e8 de 99 c6 05 <0f> 0b e8 07 3d 44 fd 49 8d 6d 44 be 04 00 00 00 48 89 ef e8 e6 4e
RSP: 0018:ffffc90000107c00 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffff88802bb9bb90 R08: 0000000000000001 R09: ffffffff914d9c7f
R10: 0000000000000001 R11: 0000000000000000 R12: ffff88802bb9bb90
R13: ffff88802bb9bb40 R14: ffff88802bb9bb90 R15: ffff88802629d108
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb01fad35c0 CR3: 00000000296c4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 net_free net/core/net_namespace.c:447 [inline]
 net_free net/core/net_namespace.c:441 [inline]
 cleanup_net+0x8bb/0xb10 net/core/net_namespace.c:634
 process_one_work+0x991/0x15c0 kernel/workqueue.c:2390
 worker_thread+0x669/0x1090 kernel/workqueue.c:2537
 kthread+0x2e8/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>


Tested on:

commit:         f3364222 ptp_qoriq: fix memory leak in probe()
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git
console output: https://syzkaller.appspot.com/x/log.txt?x=16194d79c80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ea09b0836073ee4
dashboard link: https://syzkaller.appspot.com/bug?extid=7e1e1bdb852961150198
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
patch:          https://syzkaller.appspot.com/x/patch.diff?x=15e5feb5c80000