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SubjectRe: WARNING: proc registration bug in snd_info_register
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syzbot has found a reproducer for the following crash on:

HEAD commit: 9a33b369 usb-fuzzer: main usb gadget fuzzer driver
git tree: https://github.com/google/kasan/tree/usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=147d659f200000
kernel config: https://syzkaller.appspot.com/x/.config?x=23e37f59d94ddd15
dashboard link: https://syzkaller.appspot.com/bug?extid=4d729bd9da724d0282dd
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=144ab07b200000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1559d1e3200000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+4d729bd9da724d0282dd@syzkaller.appspotmail.com

snd_usb_toneport 1-1:0.0: Line 6 POD Studio UX2 now attached
usb 1-1: USB disconnect, device number 11
snd_usb_toneport 5-1:0.0: read request failed (error -110)
------------[ cut here ]------------
proc_dir_entry 'asound/card4' already registered
WARNING: CPU: 0 PID: 5572 at fs/proc/generic.c:359
proc_register+0x3d9/0x550 fs/proc/generic.c:359
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 5572 Comm: kworker/0:2 Not tainted 5.1.0-rc4-319354-g9a33b36 #3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: usb_hub_wq hub_event
usb 2-1: Using ep0 maxpacket: 8
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0xe8/0x16e lib/dump_stack.c:113
panic+0x29d/0x5f2 kernel/panic.c:214
usb 3-1: Using ep0 maxpacket: 8
__warn.cold+0x20/0x48 kernel/panic.c:571
report_bug+0x262/0x2a0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:179 [inline]
fixup_bug arch/x86/kernel/traps.c:174 [inline]
do_error_trap+0x130/0x1f0 arch/x86/kernel/traps.c:272
do_invalid_op+0x37/0x40 arch/x86/kernel/traps.c:291
snd_usb_toneport 5-1:0.0: read request failed (error -110)
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
RIP: 0010:proc_register+0x3d9/0x550 fs/proc/generic.c:359
Code: ff df 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 61 01 00 00 48 8b 04 24
48 c7 c7 e0 a0 79 8e 48 8b b0 d0 00 00 00 e8 a7 9e 71 ff <0f> 0b 48 c7 c7
a0 90 91 91 e8 b9 10 34 0c 48 8b 4c 24 28 48 b8 00
RSP: 0018:ffff88809176f040 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff88809cf2f700 RCX: 0000000000000000
usb 2-1: config 0 interface 0 has no altsetting 0
RDX: 0000000000000000 RSI: ffffffff815b1e42 RDI: ffffed10122eddfa
RBP: ffff8880a00f3140 R08: ffff88809738e200 R09: ffffed1015a03edb
R10: ffffed1015a03eda R11: ffff8880ad01f6d7 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8880933340b8 R15: 0000000000000005
proc_mkdir_data+0x17b/0x230 fs/proc/generic.c:475
usb 2-1: New USB device found, idVendor=0e41, idProduct=4151,
bcdDevice=7a.8f
__snd_info_register sound/core/info.c:814 [inline]
snd_info_register+0x2f8/0x3e0 sound/core/info.c:854
create_subdir+0x69/0xa0 sound/core/info.c:458
snd_info_card_create+0xcf/0x230 sound/core/info.c:528
snd_card_new+0x61d/0x920 sound/core/init.c:255
line6_probe+0x135/0x1150 sound/usb/line6/driver.c:736
usb 2-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb_probe_interface+0x31d/0x820 drivers/usb/core/driver.c:361
usb 2-1: config 0 descriptor??
really_probe+0x2da/0xb10 drivers/base/dd.c:509
driver_probe_device+0x21d/0x350 drivers/base/dd.c:671
__device_attach_driver+0x1d8/0x290 drivers/base/dd.c:778
bus_for_each_drv+0x163/0x1e0 drivers/base/bus.c:454
__device_attach+0x223/0x3a0 drivers/base/dd.c:844
bus_probe_device+0x1f1/0x2a0 drivers/base/bus.c:514
device_add+0xad2/0x16e0 drivers/base/core.c:2106
usb 3-1: config 0 interface 0 has no altsetting 0
usb_set_configuration+0xdf7/0x1740 drivers/usb/core/message.c:2021
generic_probe+0xa2/0xda drivers/usb/core/generic.c:210
usb 3-1: New USB device found, idVendor=0e41, idProduct=4151,
bcdDevice=7a.8f
usb_probe_device+0xc0/0x150 drivers/usb/core/driver.c:266
really_probe+0x2da/0xb10 drivers/base/dd.c:509
driver_probe_device+0x21d/0x350 drivers/base/dd.c:671
__device_attach_driver+0x1d8/0x290 drivers/base/dd.c:778
bus_for_each_drv+0x163/0x1e0 drivers/base/bus.c:454
usb 3-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
snd_usb_toneport 5-1:0.0: write request failed (error -110)
__device_attach+0x223/0x3a0 drivers/base/dd.c:844
bus_probe_device+0x1f1/0x2a0 drivers/base/bus.c:514
usb 3-1: config 0 descriptor??
device_add+0xad2/0x16e0 drivers/base/core.c:2106
usb 5-1: send failed (error -110)
usb_new_device.cold+0x537/0xccf drivers/usb/core/hub.c:2534
hub_port_connect drivers/usb/core/hub.c:5089 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5204 [inline]
port_event drivers/usb/core/hub.c:5350 [inline]
hub_event+0x138e/0x3b00 drivers/usb/core/hub.c:5432
process_one_work+0x90f/0x1580 kernel/workqueue.c:2269
usb 5-1: send failed (error -110)
process_scheduled_works kernel/workqueue.c:2331 [inline]
worker_thread+0x7b0/0xe20 kernel/workqueue.c:2417
kthread+0x313/0x420 kernel/kthread.c:253
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..

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