Hello,

syzbot found the following issue on:

HEAD commit: 4641b323 Add linux-next specific files for 20210305 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=12584542d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=b87b6a083d302a90 dashboard link: https://syzkaller.appspot.com/bug?extid=719da9b149a931f5143f syz repro: https://syzkaller.appspot.com/x/repro.syz?x=125b52aed00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=123df2aed00000

The issue was bisected to:

commit 9799110825dba087c2bdce886977cf84dada2005 Author: Kai-Heng Feng kai.heng.feng@canonical.com Date: Thu Mar 4 04:34:16 2021 +0000

ALSA: usb-audio: Disable USB autosuspend properly in setup_disable_autosuspend()

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=178418a2d00000 final oops: https://syzkaller.appspot.com/x/report.txt?x=144418a2d00000 console output: https://syzkaller.appspot.com/x/log.txt?x=104418a2d00000

IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+719da9b149a931f5143f@syzkaller.appspotmail.com Fixes: 9799110825db ("ALSA: usb-audio: Disable USB autosuspend properly in setup_disable_autosuspend()")

usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 1-1: Product: syz usb 1-1: Manufacturer: syz usb 1-1: SerialNumber: syz usb 1-1: 0:2 : does not exist general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] CPU: 0 PID: 2965 Comm: kworker/0:2 Not tainted 5.12.0-rc1-next-20210305-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event RIP: 0010:usb_audio_probe+0xa80/0x2c70 sound/usb/card.c:833 Code: 8b 74 24 08 48 89 df e8 0e 31 06 00 e8 59 64 8d fa 48 8b 04 24 48 8d 78 12 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 af RSP: 0018:ffffc900016cf0c8 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff888023e48e88 RCX: 0000000000000000 RDX: 0000000000000002 RSI: ffffffff86e61767 RDI: 0000000000000012 RBP: 0000000000000020 R08: 0000000000000000 R09: ffffffff8d580a07 R10: ffffffff86e61bfe R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 000000000000001f FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000056098ddcb140 CR3: 00000000147bd000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:396 really_probe+0x291/0xe60 drivers/base/dd.c:554 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:740 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:846 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x228/0x4a0 drivers/base/dd.c:914 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xbdb/0x1db0 drivers/base/core.c:3242 usb_set_configuration+0x113f/0x1910 drivers/usb/core/message.c:2164 usb_generic_driver_probe+0xba/0x100 drivers/usb/core/generic.c:238 usb_probe_device+0xd9/0x2c0 drivers/usb/core/driver.c:293 really_probe+0x291/0xe60 drivers/base/dd.c:554 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:740 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:846 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x228/0x4a0 drivers/base/dd.c:914 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xbdb/0x1db0 drivers/base/core.c:3242 usb_new_device.cold+0x721/0x1058 drivers/usb/core/hub.c:2555 hub_port_connect drivers/usb/core/hub.c:5223 [inline] hub_port_connect_change drivers/usb/core/hub.c:5363 [inline] port_event drivers/usb/core/hub.c:5509 [inline] hub_event+0x2357/0x4320 drivers/usb/core/hub.c:5591 process_one_work+0x98d/0x1600 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Modules linked in: ---[ end trace 4d5988887d9521a9 ]--- RIP: 0010:usb_audio_probe+0xa80/0x2c70 sound/usb/card.c:833 Code: 8b 74 24 08 48 89 df e8 0e 31 06 00 e8 59 64 8d fa 48 8b 04 24 48 8d 78 12 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 af RSP: 0018:ffffc900016cf0c8 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff888023e48e88 RCX: 0000000000000000 RDX: 0000000000000002 RSI: ffffffff86e61767 RDI: 0000000000000012 RBP: 0000000000000020 R08: 0000000000000000 R09: ffffffff8d580a07 R10: ffffffff86e61bfe R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 000000000000001f FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005572425f2908 CR3: 0000000020f01000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

--- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches