linux-kernel - Re: [syzbot] [scsi?] WARNING in remove_proc

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Message-ID: <00000000000002300b05f6c4d86e@google.com>
Date:   Mon, 13 Mar 2023 02:36:21 -0700
From:   syzbot <syzbot+04a8437497bcfb4afa95@...kaller.appspotmail.com>
To:     hdanton@...a.com, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [scsi?] WARNING in remove_proc_entry (5)

Hello,

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

------------[ cut here ]------------
remove_proc_entry: removing non-empty directory 'scsi/ums-sddr09', leaking at least '3'
WARNING: CPU: 1 PID: 5626 at fs/proc/generic.c:718 remove_proc_entry+0x361/0x460 fs/proc/generic.c:718
Modules linked in:
CPU: 1 PID: 5626 Comm: kworker/1:7 Not tainted 6.3.0-rc1-syzkaller-00274-g134231664868-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Workqueue: usb_hub_wq hub_event
RIP: 0010:remove_proc_entry+0x361/0x460 fs/proc/generic.c:718
Code: fa 48 c1 ea 03 80 3c 02 00 0f 85 be 00 00 00 49 8b 94 24 d8 00 00 00 48 c7 c6 40 ac 5e 8a 48 c7 c7 60 ab 5e 8a e8 5f df 42 ff <0f> 0b e9 6d fe ff ff e8 c3 c2 7a ff 48 c7 c7 c0 68 99 8c e8 f7 e9
RSP: 0018:ffffc90005ec7650 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 1ffff92000bd8ecc RCX: 0000000000000000
RDX: ffff888020808000 RSI: ffffffff814bf3a7 RDI: 0000000000000001
RBP: ffff88807c1e4c80 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880177e9b40
R13: ffff88807c1e4d38 R14: ffff88823bd68ff8 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f209e780ff8 CR3: 0000000029ee1000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 scsi_proc_hostdir_rm+0x107/0x280 drivers/scsi/scsi_proc.c:206
 scsi_host_dev_release+0xc9/0x3b0 drivers/scsi/hosts.c:346
 device_release+0xa3/0x240 drivers/base/core.c:2436
 kobject_cleanup lib/kobject.c:681 [inline]
 kobject_release lib/kobject.c:712 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x1c2/0x4d0 lib/kobject.c:729
 put_device+0x1f/0x30 drivers/base/core.c:3697
 usb_unbind_interface+0x1dc/0x8e0 drivers/usb/core/driver.c:458
 device_remove drivers/base/dd.c:542 [inline]
 device_remove+0x11f/0x170 drivers/base/dd.c:534
 __device_release_driver drivers/base/dd.c:1240 [inline]
 device_release_driver_internal+0x443/0x610 drivers/base/dd.c:1263
 bus_remove_device+0x22c/0x420 drivers/base/bus.c:574
 device_del+0x48a/0xb80 drivers/base/core.c:3775
 usb_disable_device+0x35a/0x7b0 drivers/usb/core/message.c:1420
 usb_disconnect+0x2db/0x8a0 drivers/usb/core/hub.c:2238
 hub_port_connect drivers/usb/core/hub.c:5246 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5551 [inline]
 port_event drivers/usb/core/hub.c:5711 [inline]
 hub_event+0x1fbf/0x4e40 drivers/usb/core/hub.c:5793
 process_one_work+0x991/0x1710 kernel/workqueue.c:2390
 process_scheduled_works kernel/workqueue.c:2453 [inline]
 worker_thread+0x858/0x1090 kernel/workqueue.c:2539
 kthread+0x2e8/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>


Tested on:

commit:         13423166 Merge tag 'staging-6.3-rc2' of git://git.kern..
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=13eabf24c80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8aef547e348b1ab8
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
patch:          https://syzkaller.appspot.com/x/patch.diff?x=13a7ceecc80000