Hello,
syzbot found 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=1065d5bb200000 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)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+4d729bd9da724d0282dd@syzkaller.appspotmail.com
usb 3-1: config 0 descriptor?? snd_usb_toneport 1-1:0.0: Line 6 POD Studio UX2 now attached usb 1-1: USB disconnect, device number 26 ------------[ cut here ]------------ proc_dir_entry 'asound/card4' already registered WARNING: CPU: 0 PID: 533 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: 533 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 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 __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 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:ffff88809f59f018 EFLAGS: 00010282 RAX: 0000000000000000 RBX: ffff88821443f0c0 RCX: 0000000000000000 RDX: 0000000000040000 RSI: ffffffff815b1e42 RDI: ffffed1013eb3df5 RBP: ffff8880a7b65780 R08: ffff88809f51c980 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff88808f034ab8 R15: 0000000000000005 proc_mkdir_data+0x17b/0x230 fs/proc/generic.c:475 __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 snd_usb_audio_create sound/usb/card.c:475 [inline] usb_audio_probe+0x10d9/0x1fa0 sound/usb/card.c:621 usb_probe_interface+0x31d/0x820 drivers/usb/core/driver.c:361 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_set_configuration+0xdf7/0x1740 drivers/usb/core/message.c:2021 generic_probe+0xa2/0xda drivers/usb/core/generic.c:210 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 __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_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 worker_thread+0x9b/0xe20 kernel/workqueue.c:2415 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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