linux-kernel - [syzbot] WARNING in kernfs

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Message-ID: <000000000000bd87fc05d2215a71@google.com>
Date:   Wed, 01 Dec 2021 19:26:21 -0800
From:   syzbot <syzbot+07fe64297eacba9c7550@...kaller.appspotmail.com>
To:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, tj@...nel.org
Subject: [syzbot] WARNING in kernfs_get (3)

Hello,

syzbot found the following issue on:

HEAD commit:    f81e94e91878 Add linux-next specific files for 20211125
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=129e9f26b00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=be9183de0824e4d7
dashboard link: https://syzkaller.appspot.com/bug?extid=07fe64297eacba9c7550
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.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+07fe64297eacba9c7550@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 27468 at fs/kernfs/dir.c:496 kernfs_get.part.0+0x69/0x80 fs/kernfs/dir.c:496
Modules linked in:
CPU: 0 PID: 27468 Comm: kworker/u4:12 Not tainted 5.16.0-rc2-next-20211125-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
RIP: 0010:kernfs_get.part.0+0x69/0x80 fs/kernfs/dir.c:496
Code: 31 ff 89 ee e8 c8 a4 7d ff 85 ed 74 18 e8 9f a2 7d ff be 04 00 00 00 48 89 df e8 02 35 c8 ff f0 ff 03 5b 5d c3 e8 87 a2 7d ff <0f> 0b eb df 48 89 df e8 6b 31 c8 ff eb c6 66 0f 1f 84 00 00 00 00
RSP: 0018:ffffc900065af918 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88800011a1d0 RCX: 0000000000000000
RDX: ffff888087c6ba80 RSI: ffffffff81fa4259 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: ffff88800011a1d3
R10: ffffffff81fa4238 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff88800011a1d0
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f78c720a718 CR3: 0000000039c76000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 kernfs_get fs/kernfs/dir.c:495 [inline]
 __kernfs_remove+0x2a8/0xab0 fs/kernfs/dir.c:1342
 kernfs_remove_by_name_ns+0x4f/0xa0 fs/kernfs/dir.c:1544
 kernfs_remove_by_name include/linux/kernfs.h:570 [inline]
 remove_files+0x96/0x1c0 fs/sysfs/group.c:28
 sysfs_remove_group+0x87/0x170 fs/sysfs/group.c:288
 sysfs_remove_groups fs/sysfs/group.c:312 [inline]
 sysfs_remove_groups+0x5c/0xa0 fs/sysfs/group.c:304
 destroy_port drivers/infiniband/core/sysfs.c:1284 [inline]
 ib_free_port_attrs+0x162/0x460 drivers/infiniband/core/sysfs.c:1409
 remove_one_compat_dev drivers/infiniband/core/device.c:1001 [inline]
 rdma_dev_exit_net+0x2b2/0x550 drivers/infiniband/core/device.c:1139
 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:168
 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:593
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2299
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2446
 kthread+0x405/0x4f0 kernel/kthread.c:345
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>


---
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