linux-kernel - Re: [syzbot] WARNING in driver

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Date:   Fri, 27 May 2022 12:29:08 -0700
From:   syzbot <syzbot+02b16343704b3af1667e@...kaller.appspotmail.com>
To:     andreyknvl@...il.com, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        stern@...land.harvard.edu, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] WARNING in driver_unregister

Hello,

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

really_probe: driver_sysfs_add(gadget.0) failed
------------[ cut here ]------------
WARNING: CPU: 0 PID: 2361 at fs/sysfs/file.c:351 sysfs_create_file_ns+0x131/0x1c0 fs/sysfs/file.c:351
Modules linked in:
CPU: 0 PID: 2361 Comm: syz-executor.0 Not tainted 5.18.0-rc5-syzkaller-00157-g97fa5887cf28-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:sysfs_create_file_ns+0x131/0x1c0 fs/sysfs/file.c:351
Code: e9 03 80 3c 01 00 75 7f 8b 4c 24 38 4d 89 e9 48 89 ee 48 8b 7b 30 44 8b 44 24 48 e8 e9 fa ff ff 41 89 c5 eb 0d e8 cf 7c 9d ff <0f> 0b 41 bd ea ff ff ff e8 c2 7c 9d ff 48 b8 00 00 00 00 00 fc ff
RSP: 0018:ffffc900028ffca0 EFLAGS: 00010293

RAX: 0000000000000000 RBX: ffff88810efd6600 RCX: 0000000000000000
RDX: ffff888117a68000 RSI: ffffffff81a6f891 RDI: ffff88810efd6600
RBP: ffffffff88041fc0 R08: 0000000000000000 R09: ffff88810095ba13
R10: ffffed102012b742 R11: 0000000000000001 R12: 1ffff9200051ff95
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff88810efd6630
FS:  00007f830048d700(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f830048d718 CR3: 000000010cb4c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 sysfs_create_file include/linux/sysfs.h:607 [inline]
 driver_create_file+0x48/0x70 drivers/base/driver.c:107
 bus_add_driver+0x309/0x630 drivers/base/bus.c:624
 driver_register+0x220/0x3a0 drivers/base/driver.c:171
 usb_gadget_register_driver_owner+0xfb/0x1e0 drivers/usb/gadget/udc/core.c:1558
 raw_ioctl_run drivers/usb/gadget/legacy/raw_gadget.c:513 [inline]
 raw_ioctl+0x1883/0x2730 drivers/usb/gadget/legacy/raw_gadget.c:1220
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f83005590e9
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f830048d168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f830066c100 RCX: 00007f83005590e9
RDX: 0000000000000000 RSI: 0000000000005501 RDI: 0000000000000003
RBP: 00007f83005b308d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc1dbfbf0f R14: 00007f830048d300 R15: 0000000000022000
 </TASK>


Tested on:

commit:         97fa5887 USB: new quirk for Dell Gen 2 devices
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
console output: https://syzkaller.appspot.com/x/log.txt?x=154282bdf00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d7b232ec3adf5c8d
dashboard link: https://syzkaller.appspot.com/bug?extid=02b16343704b3af1667e
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=17eec23df00000