syzbot

======================================================
WARNING: possible circular locking dependency detected
6.12.0-rc6-syzkaller-00077-g2e1b3cc9d7f7 #0 Not tainted
------------------------------------------------------
syz.4.751/8817 is trying to acquire lock:
ffff888022b15e20 (&hdev->ll_open_lock){+.+.}-{3:3}, at: hid_hw_open+0x28/0x170 drivers/hid/hid-core.c:2386

but task is already holding lock:
ffff888062f142c0 (&dev->mutex#2){+.+.}-{3:3}, at: input_open_device+0x52/0x2e0 drivers/input/input.c:597

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&dev->mutex#2){+.+.}-{3:3}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
       __mutex_lock_common kernel/locking/mutex.c:608 [inline]
       __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
       input_disconnect_device drivers/input/input.c:724 [inline]
       __input_unregister_device+0x31/0x620 drivers/input/input.c:2270
       input_unregister_device+0xa3/0x100 drivers/input/input.c:2511
       steam_client_ll_open+0x88/0xa0 drivers/hid/hid-steam.c:1121
       hid_hw_open+0xe3/0x170 drivers/hid/hid-core.c:2391
       hidraw_open+0x298/0x8e0 drivers/hid/hidraw.c:308
       chrdev_open+0x521/0x600 fs/char_dev.c:414
       do_dentry_open+0x978/0x1460 fs/open.c:958
       vfs_open+0x3e/0x330 fs/open.c:1088
       do_open fs/namei.c:3774 [inline]
       path_openat+0x2c84/0x3590 fs/namei.c:3933
       do_filp_open+0x235/0x490 fs/namei.c:3960
       do_sys_openat2+0x13e/0x1d0 fs/open.c:1415
       do_sys_open fs/open.c:1430 [inline]
       __do_sys_openat fs/open.c:1446 [inline]
       __se_sys_openat fs/open.c:1441 [inline]
       __x64_sys_openat+0x247/0x2a0 fs/open.c:1441
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&hdev->ll_open_lock){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3161 [inline]
       check_prevs_add kernel/locking/lockdep.c:3280 [inline]
       validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
       __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
       __mutex_lock_common kernel/locking/mutex.c:608 [inline]
       __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
       hid_hw_open+0x28/0x170 drivers/hid/hid-core.c:2386
       input_open_device+0x191/0x2e0 drivers/input/input.c:617
       evdev_open_device drivers/input/evdev.c:391 [inline]
       evdev_open+0x3e0/0x5f0 drivers/input/evdev.c:478
       chrdev_open+0x521/0x600 fs/char_dev.c:414
       do_dentry_open+0x978/0x1460 fs/open.c:958
       vfs_open+0x3e/0x330 fs/open.c:1088
       do_open fs/namei.c:3774 [inline]
       path_openat+0x2c84/0x3590 fs/namei.c:3933
       do_filp_open+0x235/0x490 fs/namei.c:3960
       do_sys_openat2+0x13e/0x1d0 fs/open.c:1415
       do_sys_open fs/open.c:1430 [inline]
       __do_sys_openat fs/open.c:1446 [inline]
       __se_sys_openat fs/open.c:1441 [inline]
       __x64_sys_openat+0x247/0x2a0 fs/open.c:1441
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&dev->mutex#2);
                               lock(&hdev->ll_open_lock);
                               lock(&dev->mutex#2);
  lock(&hdev->ll_open_lock);

 *** DEADLOCK ***

2 locks held by syz.4.751/8817:
 #0: ffff88805357b118 (&evdev->mutex){+.+.}-{3:3}, at: evdev_open_device drivers/input/evdev.c:384 [inline]
 #0: ffff88805357b118 (&evdev->mutex){+.+.}-{3:3}, at: evdev_open+0x2e9/0x5f0 drivers/input/evdev.c:478
 #1: ffff888062f142c0 (&dev->mutex#2){+.+.}-{3:3}, at: input_open_device+0x52/0x2e0 drivers/input/input.c:597

stack backtrace:
CPU: 1 UID: 0 PID: 8817 Comm: syz.4.751 Not tainted 6.12.0-rc6-syzkaller-00077-g2e1b3cc9d7f7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074
 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206
 check_prev_add kernel/locking/lockdep.c:3161 [inline]
 check_prevs_add kernel/locking/lockdep.c:3280 [inline]
 validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
 __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
 __mutex_lock_common kernel/locking/mutex.c:608 [inline]
 __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
 hid_hw_open+0x28/0x170 drivers/hid/hid-core.c:2386
 input_open_device+0x191/0x2e0 drivers/input/input.c:617
 evdev_open_device drivers/input/evdev.c:391 [inline]
 evdev_open+0x3e0/0x5f0 drivers/input/evdev.c:478
 chrdev_open+0x521/0x600 fs/char_dev.c:414
 do_dentry_open+0x978/0x1460 fs/open.c:958
 vfs_open+0x3e/0x330 fs/open.c:1088
 do_open fs/namei.c:3774 [inline]
 path_openat+0x2c84/0x3590 fs/namei.c:3933
 do_filp_open+0x235/0x490 fs/namei.c:3960
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1415
 do_sys_open fs/open.c:1430 [inline]
 __do_sys_openat fs/open.c:1446 [inline]
 __se_sys_openat fs/open.c:1441 [inline]
 __x64_sys_openat+0x247/0x2a0 fs/open.c:1441
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efcfd17d0b0
Code: 48 89 44 24 20 75 93 44 89 54 24 0c e8 19 8f 02 00 44 8b 54 24 0c 89 da 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 38 44 89 c7 89 44 24 0c e8 6c 8f 02 00 8b 44
RSP: 002b:00007efcfb5f5b70 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007efcfd17d0b0
RDX: 0000000000000000 RSI: 00007efcfb5f5c10 RDI: 00000000ffffff9c
RBP: 00007efcfb5f5c10 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 00007efcfd335f80 R15: 00007ffe5c9e1c38
 </TASK>
netlink: 8 bytes leftover after parsing attributes in process `syz.4.751'.
UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy
misc raw-gadget: fail, usb_gadget_register_driver returned -16